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  • TPD8S300 USB Type-C Port Protector: Short-to-VBUS Overvoltage and IEC ESD Protection

    • SLVSDD6B September   2016  – November 2016 TPD8S300

      PRODUCTION DATA.  

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  • TPD8S300 USB Type-C Port Protector: Short-to-VBUS Overvoltage and IEC ESD Protection
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings—JEDEC Specification
    3. 7.3 ESD Ratings—IEC Specification
    4. 7.4 Recommended Operating Conditions
    5. 7.5 Thermal Information
    6. 7.6 Electrical Characteristics
    7. 7.7 Timing Requirements
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins): 24-VDC Tolerant
      2. 8.3.2 8-Channels of IEC 61000-4-2 ESD Protection (CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B Pins)
      3. 8.3.3 CC1, CC2 Overvoltage Protection FETs 600 mA Capable for Passing VCONN Power
      4. 8.3.4 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices
      5. 8.3.5 3-mm × 3-mm WQFN Package
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 VBIAS Capacitor Selection
        2. 9.2.2.2 Dead Battery Operation
        3. 9.2.2.3 CC Line Capacitance
        4. 9.2.2.4 Additional ESD Protection on CC and SBU Lines
        5. 9.2.2.5 FLT Pin Operation
        6. 9.2.2.6 How to Connect Unused Pins
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RUK|20
    • MPQF220D
Thermal pad, mechanical data (Package|Pins)
  • RUK|20
    • QFND191D
Orderable Information
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  • slvsdd6b_pm
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DATA SHEET

TPD8S300 USB Type-C Port Protector: Short-to-VBUS Overvoltage and IEC ESD Protection

1 Features

  • 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2): 24-VDC Tolerant
  • 8-Channels of IEC 61000-4-2 ESD Protection (CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B)
  • CC1, CC2 Overvoltage Protection FETs 600 mA capable for passing VCONN power
  • CC Dead Battery Resistors integrated for handling dead battery use case in mobile devices
  • 3-mm × 3-mm WQFN Package

2 Applications

  • Laptop PC
  • Tablets
  • Smartphones
  • Monitors and TVs
  • Docking Stations

3 Description

The TPD8S300 is a single chip USB Type-C port protection solution that provides 20-V Short-to-VBUS overvoltage and IEC ESD protection.

Since the release of the USB Type-C connector, many products and accessories for USB Type-C have been released which do not meet the USB Type-C specification. One example of this is USB Type-C Power Delivery adaptors that only place 20 V on the VBUS line. Another concern for USB Type-C is that mechanical twisting and sliding of the connector could short pins due to the close proximity they have in this small connector. This can cause 20-V VBUS to be shorted to the CC and SBU pins. Also, due to the close proximity of the pins in the Type-C connector, there is a heightened concern that debris and moisture will cause the 20-V VBUS pin to be shorted to the CC and SBU pins.

These non-ideal equipments and mechanical events make it necessary for the CC and SBU pins to be 20-V tolerant, even though they only operate at 5 V or lower. The TPD8S300 enables the CC and SBU pins to be 20-V tolerant without interfering with normal operation by providing overvoltage protection on the CC and SBU pins. The device places high voltage FETs in series on the SBU and CC lines. When a voltage above the OVP threshold is detected on these lines, the high voltage switches are opened up, isolating the rest of the system from the high voltage condition present on the connector.

Finally, most systems require IEC 61000-4-2 system level ESD protection for their external pins. The TPD8S300 integrates IEC 61000-4-2 ESD protection for the CC1, CC2, SBU1, SBU2, DP_T (Top side D+), DM_T (Top Side D–), DP_B (Bottom Side D+), DM_B (Bottom Side D–) pins, removing the need to place high voltage TVS diodes externally on the connector.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPD8S300 WQFN (20) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Application Diagram

TPD8S300 TPD8S300_App_2.gif

4 Revision History

Changes from A Revision (September 2016) to B Revision

  • First public release of the data sheetGo

5 Device Comparison Table

Part Number Over Voltage Protected Channels IEC 61000-4-2 ESD Protected Channels
TPD6S300 4-Ch (CC1, CC2, SBU1, SBU2) 6-Ch (CC1, CC2, SBU1, SBU2, DP, DM)
TPD8S300 4-Ch (CC1, CC2, SBU1, SBU2) 8-Ch (CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B)

6 Pin Configuration and Functions

RUK Package
20 Pin WQFN
Top View
TPD8S300 TPD8S300_Pin_Out_4.gif

Pin Functions

PIN TYPE DESCRIPTION
NO. NAME
1 C_SBU1 I/O Connector side of the SBU1 OVP FET. Connect to either SBU pin of the USB Type-C connector
2 C_SBU2 I/O Connector side of the SBU2 OVP FET. Connect to either SBU pin of the USB Type-C connector
3 VBIAS Power Pin for ESD support capacitor. Place a 0.1-µF capacitor on this pin to ground
4 C_CC1 I/O Connector side of the CC1 OVP FET. Connect to either CC pin of the USB Type-C connector
5 C_CC2 I/O Connector side of the CC2 OVP FET. Connect to either CC pin of the USB Type-C connector
6 RPD_G2 I/O Short to C_CC2 if dead battery resistors are needed. If dead battery resistors are not needed, short pin to GND
7 RPD_G1 I/O Short to C_CC1 if dead battery resistors are needed. If dead battery resistors are not needed, short pin to GND
8 GND GND Ground
9 FLT O Open drain for fault reporting
10 VPWR Power 2.7-V-3.6-V power supply
11 CC2 I/O System side of the CC2 OVP FET. Connect to either CC pin of the CC/PD controller
12 CC1 I/O System side of the CC1 OVP FET. Connect to either CC pin of the CC/PD controller
13 GND GND Ground
14 SBU2 I/O System side of the SBU2 OVP FET. Connect to either SBU pin of the SBU MUX
15 SBU1 I/O System side of the SBU1 OVP FET. Connect to either SBU pin of the SBU MUX
16 D4 I/O USB2.0 IEC ESD protection. Connect to any of the USB2.0 pins of the USB Type-C connector
17 D3 I/O USB2.0 IEC ESD protection. Connect to any of the USB2.0 pins of the USB Type-C connector
18 GND GND Ground
19 D2 I/O USB2.0 IEC ESD protection. Connect to any of the USB2.0 pins of the USB Type-C connector
20 D1 I/O USB2.0 IEC ESD protection. Connect to any of the USB2.0 pins of the USB Type-C connector
— Thermal Pad GND Internally connected to GND. Used as a heatsink. Connect to the PCB GND plane

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VI Input voltage VPWR –0.3 4 V
RPD_G1, RPD_G2 –0.3 24 V
VO Output voltage FLT –0.3 6 V
VBIAS –0.3 24 V
VIO I/O voltage D1, D2, D3, D4 –0.3 6 V
CC1, CC2, SBU1, SBU2 –0.3 6 V
C_CC1, C_CC2, C_SBU1, C_SBU2 –0.3 24 V
TA Operating free air temperature –40 85 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 ESD Ratings—JEDEC Specification

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. Pins listed as ±2000 V may actually have higher performance.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Pins listed as ±500 V may actually have higher performance.

7.3 ESD Ratings—IEC Specification

VALUE UNIT
V(ESD) Electrostatic discharge(1) IEC 61000-4-2, C_CC1, C_CC2, D1, D2, D3, D4 Contact discharge ±8000 V
Air-gap discharge ±15000
IEC 61000-4-2, C_SBU1, C_SBU2 Contact discharge ±6000
Air-gap discharge ±15000
(1) Tested on the TPD8S300 EVM connected to the TPS65982 EVM.

7.4 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VI Input voltage VPWR 2.7 3.3 3.6 V
RPD_G1, RPD_G2 0 5.5 V
VO Output voltage FLT pull-up resistor power rail 2.7 5.5 V
VIO I/O voltage D1, D2, D3, D4 –0.3 5.5 V
CC1, CC2, C_CC1, C_CC2 0 5.5 V
SBU1, SBU2, C_SBU1, C_SBU2 0 4.3 V
IVCONN VCONN current Current flowing into CC1/2 and flowing out of C_CC1/2, VCCx – VC_CCx ≤ 250 mV 600 mA
IVCONN VCONN current Current flowing into CC1/2 and flowing out of C_CC1/2, TJ ≤ 105°C 1.25 A
External components(1) FLT pull-up resistance 1.7 300 kΩ
VBIAS capacitance(2) 0.1 µF
VPWR capacitance 0.3 1 µF
(1) For recommended values for capacitors and resistors, the typical values assume a component placed on the board near the pin. Minimum and maximum values listed are inclusive of manufacturing tolerances, voltage derating, board capacitance, and temperature variation. The effective value presented must be within the minimum and maximums listed in the table.
(2) The VBIAS pin requires a minimum 35-VDC rated capacitor. A 50-VDC rated capacitor is recommended to reduce capacitance derating. See the VBIAS Capacitor Selection section for more information on selecting the VBIAS capacitor.

7.5 Thermal Information

THERMAL METRIC(1) TPD8S300 UNIT
RUK (WQFN)
20 PINS
RθJA Junction-to-ambient thermal resistance 45.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 48.8 °C/W
RθJB Junction-to-board thermal resistance 17.1 °C/W
ψJT Junction-to-top characterization parameter 0.6 °C/W
ψJB Junction-to-board characterization parameter 17.1 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 3.7 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

7.6 Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CC OVP Switches
RON On resistance of CC OVP FETs, TJ ≤ 85°C CCx = 5.5 V 278 392 mΩ
On resistance of CC OVP FETs, TJ ≤ 105°C CCx = 5.5 V 278 415 mΩ
RONFLAT On resistance flatness Sweep CCx voltage between 0 V and 1.2 V 5 mΩ
CON_CC Equivalent on capacitance Capacitance from C_CCx or CCx to GND when device is powered. VC_CCx/VCCx = 0 V to 1.2 V , f = 400 kHz 60 74 120 pF
RD_DB Dead battery pull-down resistance (only present when device is unpowered). Effective resistance of RD and FET in series V_C_CCx = 2.6 V 4.1 5.1 6.1 kΩ
VTH_DB Threshold voltage of the pulldown FET in series with RD during dead battery I_CC = 80 µA 0.5 0.9 1.2 V
VOVPCC OVP threshold on CC pins Place 5.5 V on C_CCx. Step up C_CCx until the FLT pin is asserted 5.75 6 6.2 V
VOVPCC_HYS Hysteresis on CC OVP Place 6.5 V on C_CCx. Step down the voltage on C_CCx until the FLT pin is deasserted. Measure difference between rising and falling OVP threshold for CC 50 mV
BWON On bandwidth single ended (–3 dB) Measure the –3-dB bandwidth from C_CCx to CCx. Single ended measurement, 50-Ω system. Vcm = 0.1 V to 1.2 V 100 MHz
VSTBUS_CC Short-to-VBUS tolerance on the CC pins Hot-Plug C_CCx with a 1 meter USB Type C Cable, place a 30-Ω load on CCx 24 V
VSTBUS_CC_CLAMP Short-to-VBUS system-side clamping voltage on the CC pins (CCx) Hot-Plug C_CCx with a 1 meter USB Type C Cable. Hot-Plug voltage C_CCx = 24 V. VPWR = 3.3 V. Place a 30-Ω load on CCx 8 V
SBU OVP Switches
RON On resistance of SBU OVP FETs SBUx = 3.6 V. –40°C ≤ TJ ≤ +85°C 4 6.5 Ω
RONFLAT On resistance flatness Sweep SBUx voltage between 0 V and 3.6 V. –40°C ≤ TJ ≤ +85°C 0.7 1.5 Ω
CON_SBU Equivalent on capacitance Capacitance from SBUx or C_SBUx to GND when device is powered. Measure at VC_SBUx/VSBUx = 0.3 V to 3.6 V 6 pF
VOVPSBU OVP threshold on SBU pins Place 3.6 V on C_SBUx. Step up C_SBUx until the FLT pin is asserted 4.35 4.5 4.7 V
VOVPSBU_HYS Hysteresis on SBU OVP Place 5 V on C_CCx. Step down the voltage on C_CCx until the FLT pin is deasserted. Measure difference between rising and falling OVP threshold for C_SBUx 50 mV
BWON On bandwidth single ended (–3 dB) Measure the –3-dB bandwidth from C_SBUx to SBUx. Single ended measurement, 50-Ω system. Vcm = 0.1 V to 3.6 V 1000 MHz
XTALK Crosstalk Measure crosstalk at f = 1 MHz from SBU1 to C_SBU2 or SBU2 to C_SBU1. Vcm1 = 3.6 V, Vcm2 = 0.3 V. Be sure to terminate open sides to 50 Ω –80 dB
VSTBUS_SBU Short-to-VBUS tolerance on the SBU pins Hot-Plug C_SBUx with a 1 meter USB Type C Cable. Put a 150-nF capacitor in series with a 40-Ω resistor to GND on SBUx 24 V
VSTBUS_SBU_CLAMP Short-to-VBUS system-side clamping voltage on the SBU pins (SBUx) Hot-Plug C_SBUx with a 1 meter USB Type C Cable. Hot-Plug voltage C_SBUx = 24 V. VPWR = 3.3 V. Put a 100-nF capacitor in series with a 40-Ω resistor to GND on SBUx 8 V
Power Supply and Leakage Currents
VPWR_UVLO VPWR under voltage lockout Place 1 V on VPWR and raise voltage until SBU or CC FETs turnon 2.1 2.3 2.5 V
VPWR_UVLO_HYS VPWR UVLO hysteresis Place 3 V on VPWR and lower voltage until SBU or CC FETs turnoff; measure difference between rising and falling UVLO to calculate hysteresis 100 150 200 mV
IVPWR VPWR supply current VPWR = 3.3 V (typical), VPWR = 3.6 V (maximum). –40°C ≤ TJ ≤ +85°C. 90 120 µA
ICC_LEAK Leakage current for CC pins when device is powered VPWR = 3.3 V, VC_CCx = 3.6 V, CCx pins are floating, measure leakage into C_CCx pins. Result must be same if CCx side is biased and C_CCx is left floating. 5 µA
ISBU_LEAK Leakage current for SBU pins when device is powered VPWR = 3.3 V, VC_SBUx = 3.6 V, SBUx pins are floating, measure leakge into C_SBUx pins. Result must be same if SBUx side is biased and C_SBUx is left floating. –40°C ≤ TJ ≤ 85°C. 3 µA
IC_CC_LEAK_OVP Leakage current for CC pins when device is in OVP VPWR = 0 V or 3.3 V, VC_CCx = 24 V, CCx pins are set to 0 V, measure leakage into C_CCx pins 1200 µA
IC_SBU_LEAK_OVP Leakage current for SBU pins when device is in OVP VPWR = 0 V or 3.3 V, VC_SBUx = 24 V, SBUx pins are set to 0 V, measure leakage into C_SBUx pins 400 µA
ICC_LEAK_OVP Leakage current for CC pins when device is in OVP VPWR = 0 V or 3.3 V, VC_CCx = 24 V, CCx pins are set to 0 V, measure leakage out of CCx pins 30 µA
ISBU_LEAK_OVP Leakage current for SBU pins when device is in OVP VPWR = 0 V or 3.3 V, VC_SBUx = 24 V, SBUx pins are set to 0 V, measure leakage out of SBUx pins –1 1 µA
IDx_LEAK Leakage current for Dx pins V_Dx = 3.6 V, measure leakage into Dx pins 1 µA
FLT Pin
VOL Low-level output voltage IOL = 3 mA. Measure the voltage at the FLT pin 0.4 V
Over Temperature Protection
TSD_RISING The rising over-temperature protection shutdown threshold 150 175 °C
TSD_FALLING The falling over-temperature protection shutdown threshold 130 140 °C
TSD_HYST The over-temperature protection shutdown threshold hysteresis 35 °C
Dx ESD Protection
VRWM_POS Reverse stand-off voltage from Dx to GND Dx to GND. IDX ≤ 1 µA 5.5 V
VRWM_NEG Reverse stand-off voltage from GND to Dx GND to Dx 0 V
VBR_POS Break-down voltage from Dx to GND Dx to GND. IBR = 1 mA 7 V
VBR_NEG Break-down voltage from GND to Dx GND to Dx. IBR = 8 mA 0.6 V
CIO Dx to GND or GND to Dx f = 1 MHz, VIO = 2.5 V 1.7 pF
ΔCIO Differential capacitance between two Dx pins f = 1 MHz, VIO = 2.5 V 0.02 pF
RDYN Dynamic on-resistance Dx IEC clamps Dx to GND or GND to Dx 0.4 Ω

7.7 Timing Requirements

MIN NOM MAX UNIT
Power-On and Off Timings
tON Time from crossing rising VPWR UVLO until CC and SBU OVP FETs are on 3.5 ms
dVPWR_OFF/dt Minimum slew rate allowed to guarantee CC and SBU FETs turnoff during a power off –0.5 V/µs
Over Voltage Protection
tOVP_RESPONSE_CC OVP response time on the CC pins. Time from OVP asserted until OVP FETs turnoff 70 ns
tOVP_RESPONSE_SBU OVP response time on the SBU pins. Time from OVP asserted until OVP FETs turnoff 80 ns
tOVP_RECOVERY_CC_1 OVP recovery time on the CC pins. Once an OVP has occurred, the minimum time duration until the CC FETs turn back on. OVP must be removed for CC FETs to turn back on 21 29 39 ms
tOVP_RECOVERY_SBU_1 OVP recovery time on the SBU pins. Once an OVP has occurred, the minimum time duration until the SBU FETs turn back on. OVP must be removed for SBU FETs to turn back on 21 29 39 ms
tOVP_RECOVERY_CC_2 OVP recovery time on the CC pins. Time from OVP removal until CC FET turns back on, if device has been in OVP > 40 ms 0.5 ms
tOVP_RECOVERY_SBU_2 OVP recovery time on the SBU pins. Time from OVP removal until SBU FET turns back on, if device has been in OVP > 40 ms 0.5 ms
tOVP_FLT_ASSERTION Time from OVP asserted to FLT assertion 20 µs
tOVP_FLT_DEASSERTION Time from CC FET turnon after an OVP to FLT deassertion 5 ms

7.8 Typical Characteristics

TPD8S300 D003_TPD8S300_Typ_Char.gif
Figure 1. SBU S21 BW
TPD8S300 D005_TPD8S300_Typ_Char.gif
Figure 3. SBU Short-to-VBUS 20 V
TPD8S300 D008_SLVSDD6.gif
Figure 5. SBU RON Flatness
TPD8S300 D010_TPD8S300_Typ_Char.gif
Figure 7. SBU IEC 61000-4-2 –4-kV Response Waveform
TPD8S300 D012_TPD8S300_Typ_Char.gif
Figure 9. C_SBU OVP Leakage Current vs Ambient Temperature at 5.5 V and 24 V
TPD8S300 D014_TPD8S300_Typ_Char.gif
Figure 11. SBU FET Turnon Timing
TPD8S300 D016_TPD8S300_Typ_Char.gif
Figure 13. SBU IV Curve
TPD8S300 D017_TPD8S300_Typ_Char.gif
Figure 15. CC Short-to-VBUS 20 V
TPD8S300 D019_TPD8S300_Typ_Char.gif
Figure 17. CC IEC 61000-4-2 8-kV Response Waveform
TPD8S300 D021_TPD8S300_Typ_Char.gif
Figure 19. C_CC Path Leakage Current vs Ambient Temperature at C_CC = 5.5 V
TPD8S300 D023_TPD8S300_Typ_Char.gif
Figure 21. CC OVP Leakage Current vs Ambient Temperature at C_CC = 24 V
TPD8S300 D025_TPD8S300_Typ_Char.gif
Figure 23. C_CC TLP Curve Unpowered
TPD8S300 D027_TPD8S300_Typ_Char.gif
Figure 25. VPWR Supply Leakage vs Ambient Temperature at 3.6 V
TPD8S300 D029_TPD8S300_Typ_Char.gif
Figure 27. Dx IV Curve
TPD8S300 D004_TPD8S300_Typ_Char.gif
Figure 2. SBU Crosstalk
TPD8S300 D006_TPD8S300_Typ_Char.gif
Figure 4. SBU Short-to-VBUS 5 V
TPD8S300 D009_TPD8S300_Typ_Char.gif
Figure 6. SBU IEC 61000-4-2 4-kV Response Waveform
TPD8S300 D011_TPD8S300_Typ_Char.gif
Figure 8. SBU Path Leakage Current vs Ambient Temperature at 3.6 V
TPD8S300 D013_TPD8S300_Typ_Char.gif
Figure 10. SBU OVP Leakage Current vs Ambient Temperature at 5.5 V and 24 V
TPD8S300 D015_TPD8S300_Typ_Char.gif
Figure 12. C_SBU TLP Curve Unpowered
TPD8S300 D001_TPD8S300_Typ_Char.gif
Figure 14. CC S21 BW
TPD8S300 D018_SLVSDD6.gif
Figure 16. CC RON Flatness
TPD8S300 D020_TPD8S300_Typ_Char.gif
Figure 18. CC IEC 61000-4-2 –8-kV Response Waveform
TPD8S300 D022_TPD8S300_Typ_Char.gif
Figure 20. C_CC OVP Leakage Current vs Ambient Temperature at C_CC = 24 V
TPD8S300 D024_TPD8S300_Typ_Char.gif
Figure 22. CC FET Turnon Timing
TPD8S300 D026_TPD8S300_Typ_Char.gif
Figure 24. C_CC IV Curve
TPD8S300 D028_TPD8S300_Typ_Char.gif
Figure 26. Dx Leakage Current vs Ambient Temperature at 0.4 V and 3.6 V
TPD8S300 D030_TPD8S300_Typ_Char.gif
Figure 28. Dx TLP Curve

8 Detailed Description

8.1 Overview

The TPD8S300 is a single chip USB Type-C port protection solution that provides 20-V Short-to-VBUS overvoltage and IEC ESD protection. Due to the small pin pitch of the USB Type-C connector and non-compliant USB Type-C cables and accessories, the VBUS pins can get shorted to the CC and SBU pins inside the USB Type-C connector. Because of this short-to-VBUS event, the CC and SBU pins need to be 20-V tolerant, to support protection on the full USB PD voltage range. Even if a device does not support 20-V operation on VBUS, non complaint adaptors can start out with 20-V VBUS condition, making it necessary for any USB Type-C device to support 20 V protection. The TPD8S300 integrates four channels of 20-V Short-to-VBUS overvoltage protection for the CC1, CC2, SBU1, and SBU2 pins of the USB Type-C connector.

Additionally, IEC 61000-4-2 system level ESD protection is required in order to protect a USB Type-C port from ESD strikes generated by end product users. The TPD8S300 integrates eight channels of IEC61000-4-2 ESD protection for the CC1, CC2, SBU1, SBU2, DP_T (Top side D+), DM_T (Top Side D–), DP_B (Bottom Side D+), and DM_B (Bottom Side D–) pins of the USB Type-C connector. This means IEC ESD protection is provided for all of the low-speed pins on the USB Type-C connector in a single chip in the TPD8S300. Additionally, high-voltage IEC ESD protection that is 22-V DC tolerant is required for the CC and SBU lines in order to simultaneously support IEC ESD and Short-to-VBUS protection; there are not many discrete market solutions that can provide this kind of protection. This high-voltage IEC ESD diode is what the TPD8S300 integrates, specifically designed to guarantee it works in conjunction with the overvoltage protection FETs inside the device. This sort of solution is very hard to generate with discrete components.

8.2 Functional Block Diagram

TPD8S300 TPD8S300_Functional_Block_6.gif

8.3 Feature Description

8.3.1 4-Channels of Short-to-VBUS Overvoltage Protection (CC1, CC2, SBU1, SBU2 Pins): 24-VDC Tolerant

The TPD8S300 provides 4-channels of Short-to-VBUS Overvoltage Protection for the CC1, CC2, SBU1, and SBU2 pins of the USB Type-C connector. The TPD8S300 is able to handle 24-VDC on its C_CC1, C_CC2, C_SBU1, and C_SBU2 pins. This is necessary because according to the USB PD specification, with VBUS set for 20-V operation, the VBUS voltage is allowed to legally swing up to 21 V, and 21.5 V on voltage transitions from a different USB PD VBUS voltage. The TPD8S300 builds in tolerance up to 24-VBUS to provide margin above this 21.5 V specification to be able to support USB PD adaptors that may break the USB PD specification.

When a short-to-VBUS event occurs, ringing happens due to the RLC elements in the hot-plug event. With very low resistance in this RLC circuit, ringing up to twice the settling voltage can appear on the connector. More than 2x ringing can be generated if any capacitor on the line derates in capacitance value during the short-to-VBUS event. This means that more than 44 V could be seen on a USB Type-C pin during a Short-to-VBUS event. The TPD8S300 has built in circuit protection to handle this ringing. The diode clamps used for IEC ESD protection also clamp the ringing voltage during the short-to-VBUS event to limit the peak ringing to around 30 V. Additionally, the overvoltage protection FETs integrated inside the TPD8S300 are 30-V tolerant, therefore being capable of supporting the high-voltage ringing waveform that is experienced during the short-to-VBUS event. The well designed combination of voltage clamps and 30-V tolerant OVP FETs insures the TPD8S300 can handle Short-to-VBUS hot-plug events with hot-plug voltages as high as 24-VDC.

The TPD8S300 has an extremely fast turnoff time of 70 ns typical. Furthermore, additional voltage clamps are placed after the OVP FET on the system side (CC1, CC2, SBU1, SBU2) pins of the TPD8S300, to further limit the voltage and current that is exposed to the USB Type-C CC/PD controller during the 70 ns interval while the OVP FET is turning off. The combination of connector side voltage clamps, OVP FETs with extremely fast turnoff time, and system side voltage clamps all work together to insure the level of stress seen on a CC1, CC2, SBU1, or SBU2 pin during a short-to-VBUS event is less than or equal to an HBM event. This is done by design, as any USB Type-C CC/PD controller will have built in HBM ESD protection.

Figure 29 is an example of the TPD8S300 successfully protecting the TPS65982, the world's first fully integrated, full-featured USB Type-C and PD controller.

TPD8S300 TPD8S300_TPS6598x_STBUS.gif Figure 29. TPD8S300 Protecting the TPS65982 During a Short-to-VBUS Event

8.3.2 8-Channels of IEC 61000-4-2 ESD Protection (CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B Pins)

The TPD8S300 integrates 8-Channels of IEC 61000-4-2 system level ESD protection for the CC1, CC2, SBU1, SBU2, DP_T (Top side D+), DM_T (Top Side D–), DP_B (Bottom Side D+), and DM_B (Bottom Side D–) pins. USB Type-C ports on end-products need system level IEC ESD protection in order to provide adequate protection for the ESD events that the connector can be exposed to from end users. The TPD8S300 integrates IEC ESD protection for all of the low-speed pins on the USB Type-C connector in a single chip. Also note, that while the RPD_Gx pins are not individually rated for IEC ESD, when they are shorted to the C_CCx pins, the C_CCx pins provide protection for both the C_CCx pins and the RPD_Gx pins. Additionally, high-voltage IEC ESD protection that is 24-V DC tolerant is required for the CC and SBU lines in order to simultaneously support IEC ESD and Short-to-VBUS protection; there are not many discrete market solutions that can provide this kind of protection. The TPD8S300 integrates this type of high-voltage ESD protection so a system designer can meet both IEC ESD and Short-to-VBUS protection requirements in a single device.

8.3.3 CC1, CC2 Overvoltage Protection FETs 600 mA Capable for Passing VCONN Power

The CC pins on the USB Type-C connector serve many functions; one of the functions is to be a provider of power to active cables. Active cables are required when desiring to pass greater than 3 A of current on the VBUS line or when the USB Type-C port uses the super-speed lines (TX1+, TX2–, RX1+, RX1–, TX2+, TX2–, RX2+, RX2–). When CC is configured to provide power, it is called VCONN. VCONN is a DC voltage source in the range of 3 V-5.5 V. If supporting VCONN, a VCONN provider must be able to provide 1 W of power to a cable; this translates into a current range of 200 mA to 333 mA (depending on your VCONN voltage level). Additionally, if operating in a USB PD alternate mode, greater power levels are allowed on the VCONN line.

When a USB Type-C port is configured for VCONN and using the TPD8S300, this VCONN current flows through the OVP FETs of the TPD8S300. Therefore, the TPD8S300 has been designed to handle these currents and have an RON low enough to provide a specification compliant VCONN voltage to the active cable. The TPD8S300 is designed to handle up to 600 mA of DC current to allow for alternate mode support in addition to the standard 1 W required by the USB Type-C specification.

8.3.4 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices

An important feature of USB Type-C and USB PD is the ability for this connector to serve as the sole power source to mobile devices. With support up to 100 W, the USB Type-C connector supporting USB PD can be used to power a whole new range of mobile devices not previously possible with legacy USB connectors.

When the USB Type-C connector is the sole power supply for a battery powered device, the device must be able to charge from the USB Type-C connector even when its battery is dead. In order for a USB Type-C power adapter to supply power on VBUS, RD pull-down resistors must be exposed on the CC pins. These RD resistors are typically included inside a USB Type-C CC/PD controller. However, when the TPD8S300 is used to protect the USB Type-C port, the OVP FETs inside the device isolates these RD resistors in the CC/PD controller when the mobile device has no power. This is because when the TPD8S300 has no power, the OVP FETs are turned off to guarantee overvoltage protection in a dead battery condition. Therefore, the TPD8S300 integrates high-voltage, dead battery RD pull-down resistors to allow dead battery charging simultaneously with high-voltage OVP protection.

If dead battery support is required, short the RPD_G1 pin to the C_CC1 pin, and short the RPD_G2 pin to the C_CC2 pin. This connects the dead battery resistors to the connector CC pins. When the TPD8S300 is unpowered, and the RP pull-up resistor is connected from a power adaptor, this RP pull-up resistor activates the RD resistor inside the TPD8S300. This enables VBUS to be applied from the power adaptor even in a dead battery condition. Once power is restored back to the system and back to the TPD8S300 on its VPWR pin, the TPD8S300 removes its RD pull-down resistor and turn on its OVP FETs within 3.5 ms to guarantee the RD pull-down resistor inside the CC/PD Controller is exposed within 10 ms. This is by design, because if the RD pull-down resistor is not exposed within 10 ms, the power adaptor can legally interpret this behavior as a port disconnect and remove VBUS.

If desiring to power the CC/PD controller during dead battery mode and if the CC/PD Controller is configured as a DRP, it is critical that the TPD8S300 be powered before or at the same time that the CC/PD controller is powered. It is also critical that when unpowered, the CC/PD controller also expose its dead battery resistors. When the TPD8S300 gets powered, it exposes the CC pins of the CC/PD controller within 3.5 ms. Once the TPD8S300 turns on, the RD pull-down resistors of the CC/PD controller must be present immediately, in order to guarantee the power adaptor connected to power the dead battery device keeps its VBUS turned on. If the power adaptor sees any change to its CC voltage for more than 10 ms, it can disconnect VBUS. This removes power from the device with its battery still not sufficiently charged, which consequently removes power from the CC/PD controller and the TPD8S300. Then the RD resistors of the TPD8S300 are exposed again, connect the power adaptor's VBUS to start the cycle over. This creates an infinite loop, never or very slowly charging the mobile device.

If the CC/PD Controller is configured for DRP and has started its DRP toggle before the TPD8S300 turns on, this DRP toggle is unable to guarantee that the power adaptor does not disconnect from the port. Therefore, it is recommended if the CC/PD controller is configured for DRP, that its dead battery resistors be exposed as well, and that they remain exposed until the TPD8S300 turns on. This is typically accomplished by powering the TPD8S300 at the same time as the CC/PD controller when powering the CC/PD controller in dead battery operation.

If dead battery charging is not required in your application, connect the RPD_G1 and RPD_G2 pins to ground.

8.3.5 3-mm × 3-mm WQFN Package

The TPD8S300 comes in a small, 3-mm × 3-mm WQFN package, greatly reducing the size of implementing a similar protection solution discretely. The WQFN package allows support for a wider range of PCB designs. Additionally, the pin-out of the TPD8S300 was designed to optimize routing with the TPS6598x family of USB Type-C/PD controllers.

8.4 Device Functional Modes

Table 1 describes all of the functional modes for the TPD8S300. The "X" in the below table are "do not care" conditions, meaning any value can be present within the absolute maximum ratings of the datasheet and maintain that functional mode. Also note the D1, D2, D3, D4 pins are not listed, because these pins have IEC ESD protection diodes that are always present, regardless of whether the device is powered and regardless of the conditions on any of the other pins.

Table 1. Device Mode Table

Device Mode Table Inputs Outputs
MODE VPWR C_CCx C_SBUx RPD_Gx TJ FLT CC FETs SBU FETs
Normal Operating Conditions Unpowered, no dead battery support <UVLO X X Grounded X High-Z OFF OFF
Unpowered, dead battery support <UVLO X X Shorted to C_CCx X High-Z OFF OFF
Powered on >UVLO <OVP <OVP X, forced OFF <TSD High-Z ON ON
Fault Conditions Thermal shutdown >UVLO X X X, forced OFF >TSD Low (Fault Asserted) OFF OFF
CC over voltage condition >UVLO >OVP X X, forced OFF <TSD Low (Fault Asserted) OFF OFF
SBU over voltage condition >UVLO X >OVP X, forced OFF <TSD Low (Fault Asserted) OFF OFF

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TPD8S300 provides 4-channels of Short-to-VBUS overvoltage protection for the CC1, CC2, SBU1, and SBU2 pins of the USB Type-C connector, and 8-channels of IEC ESD protection for the CC1, CC2, SBU1, SBU2, DP_T, DM_T, DP_B, DM_B pins of the USB Type-C connector. Care must be taken to insure that the TPD8S300 provides adequate system protection as well as insuring that proper system operation is maintained. The following application example explains how to properly design the TPD8S300 into a USB Type-C system.

9.2 Typical Application

TPD8S300 TPD8S300_TPS6598x_Diagram_2.gif Figure 30. TPD8S300 Typical Application Diagram
TPD8S300 TPD8S300_Ref_Schematic_3.gif Figure 31. TPD8S300 Reference Schematic

9.2.1 Design Requirements

In this application example we study the protection requirements for a full-featured USB Type-C DRP Port, fully equipped with USB-PD, USB2.0, USB3.0, Display Port, and 100 W charging. The TPS65982 is used to easily enable a full-featured port with a single chip solution. In this application, all the pins of the USB Type-C connector are utilized. Both the CC and SBU pins are susceptible to shorting to the VBUS pin. With 100 W charging, VBUS operates at 20 V, requiring the CC and SBU pins to tolerate 20-VDC. Additionally, the CC, SBU, and USB2.0 pins require IEC system level ESD protection. With these protection requirements present for the USB Type-C connector, the TPD8S300 is utilized. The TPD8S300 is a single chip solution that provides all the required protection for the low speed and USB2.0 pins in the USB Type-C connector.

Table 2 shows the TPD8S300 desgin parameters.

Table 2. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
VBUS nominal operating voltage 20 V
Short-to-VBUS tolerance for the CC and SBU pins 24 V
VBIAS nominal capacitance 0.1 µF
Dead battery charging 100 W
Maximum ambient temperature requirement 85°C

9.2.2 Detailed Design Procedure

9.2.2.1 VBIAS Capacitor Selection

As noted in the Recommended Operating Conditions table, a minimum of 35-VBUS rated capacitor is required for the VBIAS pin, and a 50-VBUS capacitor is recommended. The VBIAS capacitor is in parallel with the central IEC diode clamp integrated inside the TPD8S300. A forward biased hiding diode connects the VBIAS pin to the C_CCx and C_SBUx pins. Therefore, when a Short-to-VBUS event occurs at 20 V, 20-VBUS minus a forward biased diode drop is exposed to the VBIAS pin. Additionally, during the short-to-VBUS event, ringing can occur almost double the settling voltage of 20 V, allowing a potential 40 V to be exposed to the C_CCx and C_SBUx pins. However, the internal IEC clamps limits the voltage exposed to the C_CCx and C_SBUx pins to around 30 V. Therefore, at least 35-VBUS capacitor is required to insure the VBIAS capacitor does not get destroyed during Short-to-VBUS events.

A 50-V, X7R capacitor is recommended, however. This is to further improve the derating performance of the capacitors. When the voltage across a real capacitor is increased, its capacitance value derates. The more the capacitor derates, the greater than 2x ringing can occur in the short-to-VBUS RLC circuit. 50-V X7R capacitors have great derating performance, allowing for the best short-to-VBUS performance of the TPD8S300.

Additionally, the VBIAS capacitor helps pass IEC 61000-4-2 ESD strikes. The more capacitance present, the better the IEC performance. So the less the VBIAS capacitor derates, the better the IEC performance. Table 3 shows the real capacitors recommended to achieve the best performance with the TPD8S300.

Table 3. Design Parameters

CAPACITOR SIZE PART NUMBER
0402 CC0402KRX7R9BB104
0603 GRM188R71H104KA93D

9.2.2.2 Dead Battery Operation

For this application, we want to support 100-W dead battery operation; when the laptop is out of battery, we still want to charge the laptop at 20 V and 5 A. This means that the USB PD Controller must receive power in dead battery mode. The TPS65982 has its own built in LDO in order to supply the TPS65982 power from VBUS in a dead battery condition. The TPS65982 can also provide power to its flash during this condition through its LDO_3V3 pin.

The TPD8S300s OVP FETs remain OFF when it is unpowered in order to insure in a dead battery situation proper protection is still provided to the PD controller in the system, in this case the TPS65982. However, when the OVP FETs are OFF, this isolates the TPS65982s dead battery resistors from the USB Type-C ports CC pins. A USB Type-C power adaptor must see the RD pull-down dead battery resistors on the CC pins or it does not provide power on VBUS. Since the TPS65982s dead battery resistors are isolated from the USB Type-C connector's CC pins, The TPD8S300s built in dead battery resistors must be connected. Short the RPD_G1 pin to the C_CC1 pin, and short the RPD_G2 pin to the C_CC2 pin.

Once the power adaptor sees the TPD8S300s dead battery resistors, it applies 5 V on the VBUS pin. This provides power to the TPS65982, turning the PD controller on, and allowing the battery to begin to charge. However, this application requires 100 W charging in dead battery mode, so VBUS at 20 V and 5 A is required. USB PD negotiation is required to accomplish this, so the TPS65982 needs to be able to communicate on the CC pins. This means the TPD8S300 needs to be turned on in dead battery mode as well so the TPD65982s PD controller can be exposed to the CC lines. To accomplish this, it is critical that the TPD8S300 is powered by the TPS65982s internal LDO, the LDO_3V3 pin. This way, when the TPS65982 receives power on VBUS, the TPD8S300 is turned on simultaneously.

It is critical that the TPS65982s dead battery resistors are also connected to its CC pins for dead battery operation. Short the TPS65982s RPD_G1 pin to its C_CC1 pin, and its RPD_G2 pin to its C_CC2 pin. It is critical that the TPS65982s dead battery resistors are present; once the TPD8S300 receives power, removes its dead battery resistors and turns on its OVP FETs, RD pull-down resistors must be present on the CC line in order to guarantee the power adaptor stays connected. If RD is not present and the voltage on CC changes for more than 10 ms, the power adaptor interprets this as a disconnect and remove VBUS.

Also, it is important that the TPS65982s dead battery resistors are present so it properly boots up in dead battery operation with the correct voltages on its CC pins.

Once this process has occurred, the TPS65982 can start negotiating with the power adaptor through USB PD for higher power levels, allowing 100-W operation in dead battery mode.

For more information on the TPD8S300 dead battery operation, see the CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices section in the description section of the datasheet. Also, see Figure 32 for a waveform of the CC line when the TPD8S300 is turning on and exposing the TPS65982s dead battery resistors to the USB Type-C connector.

9.2.2.3 CC Line Capacitance

USB PD has a specification for the total amount of capacitance that is required for proper USB PD BMC operation on the CC lines. The specification from section 5.8.6 of the USB PD Specification is given below in Table 4.

Table 4. USB PD cReceiver Specification

NAME DESCRIPTION MIN MAX UNIT COMMENT
cReceiver CC receiver capacitance 200 600 pF The DFP or UFP system shall have capacitance within this range when not transmitting on the line.

Therefore, the capacitance on the CC lines must stay in between 200 pF and 600 pF when USB PD is being used. Therefore, the combination of capacitances added to the system by the TPS65982, the TPD8S300, and any external capacitor must fall within these limits. Table 5 shows the analysis involved in choosing the correct external CC capacitor for this system, and shows that an external CC capacitor is required.

Table 5. CC Line Capacitor Calculation

CC Capacitance MIN MAX UNIT COMMENT
CC line target capacitance 200 600 pF From the USB PD Specification section (cReceiver, section 5.8.6).
TPS65982 capacitance 70 120 pF From the TPS65982 Datasheet.
TPD8S300 capacitance 60 120 pF From the Electrical Characteristics table.
Proposed capacitor GRM033R71E221KA01D 110 330 pF CAP, CERM, 220 pF, 25 V, ±10%, X7R, 0201 (For min and max, assume ±50% capacitance change with temperature and voltage derating to be overly conservative).
TPS65982 + TPD8S300 + GRM033R71E221KA01D 240 570 pF Meets USB PD cReceiver Specification

9.2.2.4 Additional ESD Protection on CC and SBU Lines

If additional IEC ESD protection is desired to be placed on either the CC or SBU lines, it is important that high-voltage ESD protection diodes be used. The maximum DC voltage that can be seen in USB PD is 21-VBUS, with 21.5 V allowed during voltage transitions. Therefore, an ESD protection diode must have a reverse stand off voltage higher than 21.5 V in order to guarantee the diode does not breakdown during a short-to-VBUS event and have large amounts of current flowing through it indefinitely, destroying the diode. A reverse stand off voltage of 24 V is recommended to give margin above 21.5 V in case USB Type-C power adaptors are released in the market which break the USB Type-C specification.

Furthermore, due to the fact that the Short-to-VBUS event applies a DC voltage to the CC and SBU pins, a deep-snap back diode cannot be used unless its minimum trigger voltage is above 42 V. During a Short-to-VBUS event, RLC ringing of up to 2x the settling voltage can be exposed to CC and SBU, allowing for up to 42 V to be exposed. Furthermore, if any capacitor derates on the CC or SBU line, greater than 2x ringing can occur. Since this ringing is hard to bound, it is recommended to not use deep-snap back diodes. If the diode triggers during the short-to-VBUS hot-plug event, it begins to operate in is conduction region. With a 20-VBUS source present on the CC or SBU line, this allows the diode to conduct indefinitely, destroying the diode.

9.2.2.5 FLT Pin Operation

The FLT and OVP FET have specific timing parameters to allow different benefits depending on how the system designer desires the system to respond to a Short-to-VBUS event.

Once a Short-to-VBUS occurs on the C_CCx or C_SBUx pins, the FLT pin is asserted in 20 µs (typical) so the PD controller can be notified quickly. If VBUS is being shorted to CC or SBU, it is recommended to respond to the event by forcing a detach in the USB PD controller to remove VBUS from the port. Although the USB Type-C port using the TPD8S300 is not damaged, as the TPD8S300 provides protection from these events, the other device connected through the USB Type-C Cable or any active circuitry in the cable can be damaged. Although shutting the VBUS off through a detach does not guarantee it stops the other device or cable from being damaged, it can mitigate any high current paths from causing further damage after the initial damage takes place. Additionally, even if the active cable or other device does have proper protection, the short-to-VBUS event may corrupt a configuration in an active cable or in the other PD controller, so it is best to detach and reconfigure the port.

For UFPs, the TPD8S300 automatically forces a detach, removing the need to use the FLT pin if the only response required by your system during a short-to-VBUS event is forcing a detach on the port. The TPD8S300 keeps its CC OVP FET OFF for at least 21 ms after a Short-to-VBUS event occurs, causing the CC line voltage to change from is configuration value for more than 20 ms, forcing the PD controllers to detach. For DFPs, this operation cannot be guaranteed because of the parasitic diode in the OVP FET from CCx to C_CCx and from SBUx to C_SBUx. Therefore for DFPs, using the FLT pin recommended. For our application using the TPS65982 as a DRP, using the FLT pin is recommended.

9.2.2.6 How to Connect Unused Pins

If either the RPD_Gx pins or any of the Dx pins are unused in a design, they must be connected to GND.

9.2.3 Application Curves

TPD8S300 TPD8S300_TPS6598x_DB_BOOT_2.gif
Figure 32. TPD8S300 and TPS65982 Turning On in Dead Battery Mode
TPD8S300 TPD8S300_TPS6598x_STBUS.gif
Figure 33. TPD8S300 Protecting the TPS65982 During a Short-to-VBUS Event

 
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