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  • TPS22967 Single-Channel, Ultra-Low Resistance Load Switch

    • SLVSC42A August   2013  – April 2015 TPS22967

      PRODUCTION DATA.  

  • CONTENTS
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  • TPS22967 Single-Channel, Ultra-Low Resistance Load Switch
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Typical Application Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: VBIAS = 5 V
    6. 7.6 Electrical Characteristics: VBIAS = 2.5 V
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
      1. 7.8.1 Typical AC Scope Captures at TA = 25ºC, CT = 1 nF
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 ON/OFF Control
      2. 8.3.2 Adjustable Rise Time
      3. 8.3.3 Quick Output Discharge
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Input Capacitor (Optional)
      2. 9.1.2 Output Capacitor (Optional)
      3. 9.1.3 VIN and VBIAS Voltage Range
      4. 9.1.4 Safe Operating Area (SOA)
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inrush Current
      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 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DSG|8
    • MPDS308C
Thermal pad, mechanical data (Package|Pins)
  • DSG|8
    • QFND141I
Orderable Information
  • slvsc42a_oa
  • slvsc42a_pm
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DATA SHEET

TPS22967 Single-Channel, Ultra-Low Resistance Load Switch

1 Features

  • Integrated Single-Channel Load Switch
  • Input Voltage Range: 0.8 V to 5.5 V
  • Low RON Resistance
    • RON = 22 mΩ at VIN = 5 V (VBIAS = 5 V)
    • RON = 22 mΩ at VIN = 3.6 V (VBIAS = 5 V)
    • RON = 22 mΩ at VIN = 1.8 V (VBIAS = 5 V)
  • 4-A Maximum Continuous Switch Current
  • Low Quiescent Current (50 µA)
  • Low Control Input Threshold Enables Use of
    1.2-V, 1.8-V, 2.5-V, and 3.3-V Logic
  • Configurable Rise Time
  • Quick Output Discharge (QOD)
  • WSON 8-Pin Package With Thermal Pad

2 Applications

  • Ultrabooks™
  • Notebooks and Netbooks
  • Tablet PCs
  • Consumer Electronics
  • Set-Top Boxes and Residental Gateways
  • Telecom Systems
  • Solid-State Drives (SSD)

3 Description

The TPS22967 device is a small, ultra-low RON, single-channel load switch with controlled turnon. The device contains an N-channel MOSFET that can operate over an input voltage range of 0.8 V to 5.5 V and can support a maximum continuous current of
4 A. The switch is controlled by an on/off input (ON), which can interface directly with low-voltage control signals. In the TPS22967, a 225-Ω pulldown resistor is added for quick output discharge when the switch is turned off.

The TPS22967 is available in a small, space-saving 2-mm × 2-mm 8-pin WSON package (DSG) with integrated thermal pad allowing for high power dissipation. The device is characterized for operation over the free-air temperature range of –40°C to 85°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS22967 WSON (8) 2.00 mm × 2.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Typical Application Schematic

TPS22967 typ_app_lvsc42.gif

5 Revision History

Changes from * Revision (August 2013) to A Revision

  • Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

6 Pin Configuration and Functions

DSG Package
8-Pin WSON
TPS22967 pinout_lvsbj0.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
CT 6 O Switch slew rate control. Can be left floating. See Application and Implementation for more information.
GND 5 – Device ground.
ON 3 I Active high switch control input. Do not leave floating.
VBIAS 4 I Bias voltage. Power supply to the device. Recommended voltage range for this pin is 2.5 V to 5.5 V. See Application Information section for more information.
VIN 1, 2 I Switch input. Input capacitor recommended for minimizing VIN dip. Recommended voltage range for this pin for optimal RON performance is 0.8 V to VBIAS.
VOUT 7, 8 O Switch output.
Thermal Pad – Thermal pad (exposed center pad) to alleviate thermal stress. Tie to GND. See Layout Example for layout guidelines.

7 Specifications

7.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT(2)
VIN Input voltage –0.3 6 V
VOUT Output voltage –0.3 6 V
VBIAS Bias voltage –0.3 6 V
VON ON voltage –0.3 6 V
IMAX Maximum continuous switch current 4 A
IPLS Maximum pulsed switch current, pulse <300 µs, 2% duty cycle 6 A
TA Operating free-air temperature(3) –40 85 °C
TJ Maximum junction temperature 125 °C
TLEAD Maximum lead temperature (10-s soldering time) 300 °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.
(2) All voltage values are with respect to network ground terminal.
(3) In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be derated. Maximum ambient temperature [TA(max)] is dependent on the maximum operating junction temperature [TJ(max)], the maximum power dissipation of the device in the application [PD(max)], and the junction-to-ambient thermal resistance of the part/package in the application (θJA), as given by the following equation: TA(max) = TJ(max) – (θJA × PD(max)).

7.2 ESD Ratings

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) ±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

MIN NOM MAX UNIT
VIN Input voltage 0.8 VBIAS V
VBIAS Bias voltage 2.5 5.5 V
VON ON voltage 0 5.5 V
VOUT Output voltage VIN V
VIH High-level input voltage, ON VBIAS = 2.5 V to 5.5 V 1.2 5.5 V
VIL Low-level input voltage, ON VBIAS = 2.5 V to 5.5 V 0 0.5 V
CIN Input capacitor 1(1) µF
(1) Refer to Application Information.

7.4 Thermal Information

THERMAL METRIC(1) TPS22967 UNIT
DSG [WSON]
8 PINS
RθJA Junction-to-ambient thermal resistance 65.3 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 74.2
RθJB Junction-to-board thermal resistance 35.4
ψJT Junction-to-top characterization parameter 2.2
ψJB Junction-to-board characterization parameter 36
RθJC(bot) Junction-to-case (bottom) thermal resistance 12.8
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics: VBIAS = 5 V

Unless otherwise noted, the specification in the following table applies over the operating ambient temperature –40°C ≤ TA ≤ 85°C (Full) and VBIAS = 5 V. Typical values are for TA = 25°C.
PARAMETER TEST CONDITIONS TA MIN TYP MAX UNIT
POWER SUPPLIES AND CURRENTS
IIN(VBIAS-ON) VBIAS quiescent current IOUT = 0,
VIN = VON = VBIAS = 5 V		 Full 50 75 µA
IIN(VBIAS-OFF) VBIAS shutdown current VON = GND, VOUT = 0 V Full 2 µA
IIN(VIN-OFF) VIN off-state supply current VON = GND,
VOUT = 0 V		 VIN = 5 V Full 0.2 8 µA
VIN = 3.3 V 0.02 3
VIN = 1.8 V 0.01 2
VIN = 0.8 V 0.005 1
ION ON pin input leakage current VON = 5.5 V Full 0.5 µA
RESISTANCE CHARACTERISTICS
RON ON-state resistance IOUT = –200 mA,
VBIAS = 5 V		 VIN = 5 V 25°C 22 33 mΩ
Full 35
VIN = 3.3 V 25°C 22 33
Full 35
VIN = 1.8 V 25°C 22 33
Full 35
VIN = 1.5 V 25°C 22 33
Full 35
VIN = 1.2 V 25°C 22 33
Full 35
VIN = 0.8 V 25°C 22 33
Full 35
RPD Output pulldown resistance VIN = 5.0 V, VON = 0V, IOUT = 15 mA Full 225 300 Ω

7.6 Electrical Characteristics: VBIAS = 2.5 V

Unless otherwise noted, the specification in the following table applies over the operating ambient temperature –40°C ≤ TA ≤ 85°C (Full) and VBIAS = 2.5 V. Typical values are for TA = 25°C.
PARAMETER TEST CONDITIONS TA MIN TYP MAX UNIT
POWER SUPPLIES AND CURRENTS
IIN(VBIAS-ON) VBIAS quiescent current IOUT = 0,
VIN = VON = VBIAS = 2.5 V		 Full 20 30 µA
IIN(VBIAS-OFF) VBIAS shutdown current VON = GND, VOUT = 0 V Full 2 µA
IIN(VIN-OFF) VIN off-state supply current VON = GND,
VOUT = 0 V		 VIN = 2.5 V Full 0.01 3 µA
VIN = 1.8 V 0.01 2
VIN = 1.2 V 0.005 2
VIN = 0.8 V 0.003 1
ION ON pin input leakage current VON = 5.5 V Full 0.5 µA
RESISTANCE CHARACTERISTICS
RON ON-state resistance IOUT = –200 mA,
VBIAS = 2.5 V		 VIN = 2.5 V 25°C 26 38 mΩ
Full 40
VIN = 1.8 V 25°C 26 38
Full 40
VIN = 1.5 V 25°C 25 38
Full 40
VIN = 1.2 V 25°C 24 38
Full 40
VIN = 0.8 V 25°C 24 38
Full 40
RPD Output pulldown resistance VIN = 2.5 V, VON = 0 V, IOUT = 1 mA Full 275 325 Ω

7.7 Switching Characteristics

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIN = VON = VBIAS = 5 V, TA = 25ºC (UNLESS OTHERWISE NOTED)
tON Turnon time RL = 10 Ω, CL = 0.1 µF, CT = 1000 pF 1325 µs
tOFF Turnoff time 10
tR VOUT rise time 1625
tF VOUT fall time 3.5
tD ON delay time 500
VIN = 0.8 V, VON = VBIAS = 5 V, TA = 25ºC (UNLESS OTHERWISE NOTED)
tON Turnon time RL = 10 Ω, CL = 0.1 µF, CT = 1000 pF 600 µs
tOFF Turnoff time 80
tR VOUT rise time 300
tF VOUT fall time 5.5
tD ON delay time 460
VIN = 2.5 V, VON = 5 V, VBIAS = 2.5 V, TA = 25ºC (UNLESS OTHERWISE NOTED)
tON Turnon time RL = 10 Ω, CL = 0.1 µF, CT = 1000 pF 2200 µs
tOFF Turnoff time 9
tR VOUT rise time 2275
tF VOUT fall time 3.1
tD ON delay time 1075
VIN = 0.8 V, VON = 5 V, VBIAS = 2.5 V, TA = 25ºC (UNLESS OTHERWISE NOTED)
tON Turn-on time RL = 10 Ω, CL = 0.1 µF, CT = 1000 pF 1450 µs
tOFF Turn-off time 60
tR VOUT rise time 875
tF VOUT fall time 5.5
tD ON delay time 1010
TPS22967 tst_cir_lvsc42.gifFigure 1. Test Circuit and Timing Waveforms

7.8 Typical Characteristics

TPS22967 G001_lvsbj0.gifFigure 2. VBIAS vs Quiescent Current
TPS22967 G003_lvsbj0.gifFigure 4. VIN vs Off-State VIN Current
TPS22967 G005_lvsc42.pngFigure 6. Temperature vs RON (VBIAS = 5.5 V)
TPS22967 G007_lvsc42.pngFigure 8. VIN vs RON (VBIAS = 5.5 V)
TPS22967 G009_lvsbj0.gifFigure 10. VIN vs RPD (VBIAS = 5.5 V)
TPS22967 G011_lvsbj0.gifFigure 12. VIN vs tD (VBIAS = 2.5 V, CT = 1 nF)
TPS22967 G013_lvsbj0.gifFigure 14. VIN vs tF (VBIAS = 2.5 V, CT = 1 nF)
TPS22967 G015_lvsbj0.gifFigure 16. VIN vs tOFF (VBIAS = 2.5 V, CT = 1 nF)
TPS22967 G017_lvsbj0.gifFigure 18. VIN vs tON (VBIAS = 2.5 V, CT = 1 nF)
TPS22967 G019_lvsbj0.gifFigure 20. VIN vs tR (VBIAS = 2.5 V, CT = 1 nF)
TPS22967 G021_lvsbj0.gifFigure 22. VBIAS vs tR (VIN = 2.5 V, CT = 1 nF)
TPS22967 G002_lvsbj0.gifFigure 3. VBIAS vs Shutdown Current
TPS22967 G004_lvsc42.pngFigure 5. Temperature vs RON (VBIAS = 2.5 V)
TPS22967 G006_lvsc42.pngFigure 7. VIN vs RON (VBIAS = 2.5 V)
TPS22967 G008b_lvsc42.gifFigure 9. VIN vs RON (TA = 25°C)
TPS22967 G010_lvsbj0.gifFigure 11. VON vs VOUT (TA = 25°C)
TPS22967 G012_lvsbj0.gifFigure 13. VIN vs tD (VBIAS = 5.5 V, CT = 1 nF)
TPS22967 G014_lvsbj0.gifFigure 15. VIN vs tF (VBIAS = 5.5 V, CT = 1 nF)
TPS22967 G016_lvsbj0.gifFigure 17. VIN vs tOFF (VBIAS = 5.5 V, CT = 1 nF)
TPS22967 G018_lvsbj0.gifFigure 19. VIN vs tON (VBIAS = 5.5 V, CT = 1 nF)
TPS22967 G020_lvsbj0.gifFigure 21. VIN vs tR (VBIAS = 5.5 V, CT = 1 nF)

7.8.1 Typical AC Scope Captures at TA = 25ºC, CT = 1 nF

TPS22967 sc001_lvsbj0.pngFigure 23. Turnon Response Time
(VIN = 0.8 V, VBIAS = 2.5 V, CIN = 1 µF, CL = 0.1 µF,
RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc003_lvsbj0.pngFigure 25. Turnon Response Time
(VIN = 2.5 V, VBIAS = 2.5 V, CIN = 1 µF, CL = 0.1 µF,
RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc005_lvsbj0.pngFigure 27. Turnoff Response Time
(VIN = 0.8 V, VBIAS = 2.5 V, CIN = 1 µF, CL = 0.1 µF,
RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc007_lvsbj0.pngFigure 29. Turnoff Response Time
(VIN = 2.5 V, VBIAS = 2.5 V, CIN = 1 µF, CL = 0.1 µF,
RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc002_lvsbj0.pngFigure 24. Turnon Response Time
(VIN = 0.8 V, VBIAS = 5 V, CIN = 1 µF, CL = 0.1 µF, RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 tst_lvsbj0.pngFigure 26. Turnon Response Time
(VIN = 5 V, VBIAS = 5 V, CIN = 1 µF, CL = 0.1 µF, RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc006_lvsbj0.pngFigure 28. Turnoff Response Time
(VIN = 0.8 V, VBIAS = 5 V, CIN = 1 µF, CL = 0.1 µF, RL = 10 Ω)
CH1: VOUT, CH2: ON
TPS22967 sc008_lvsbj0.pngFigure 30. Turnoff Response Time
(VIN = 5 V, VBIAS = 5 V, CIN = 1 µF, CL = 0.1 µF, RL = 10 Ω)
CH1: VOUT, CH2: ON

8 Detailed Description

8.1 Overview

The TPS22967 device is a single-channel, 4-A load switch in an 8-pin WSON package. To reduce the voltage drop in high current rails, the device implements an ultra-low resistance N-channel MOSFET. The device has a programmable slew rate for applications that require specific rise time.

The device has very low leakage current during off state. This prevents downstream circuits from pulling high standby current from the supply. Integrated control logic, driver, power supply, and output discharge FET eliminates the need for any external components, which reduces solution size and bill of materials (BOM) count.

8.2 Functional Block Diagram

TPS22967 fbd_SLVSC42.gif

8.3 Feature Description

This section describes the integrated features for the TPS22967.

8.3.1 ON/OFF Control

The ON pin controls the state of the switch. Asserting ON high enables the switch. ON is active high and has a low threshold, making it capable of interfacing with low-voltage signals. The ON pin is compatible with standard GPIO logic thresholds. It can be used with any microcontroller with 1.2 V or higher GPIO voltage. This pin cannot be left floating and must be driven either high or low for proper functionality.

8.3.2 Adjustable Rise Time

A capacitor to GND on the CT pin sets the VOUT slew rate. The voltage on the CT pin can be as high as 12 V. Therefore, the minimum voltage rating for the CT capacitor must be 25 V for optimal performance. An approximate formula for the relationship between CT and slew rate is (Equation 1 accounts for 10% to 90% measurement on VOUT and does NOT apply for CT = 0 pF. Use Table 1 to determine rise times for when CT = 0 pF):

Equation 1. TPS22967 eq1_lvsbj0.gif

where

  • SR = slew rate (in µs/V).
  • CT = the capacitance value on the CT pin (in pF).
  • The units for the constant 13.4 is in µs/V. The units for the constant 0.39 are in µs/(V × pF).

Rise time can be calculated by multiplying the input voltage by the slew rate. Table 1 contains rise time values measured on a typical device. Rise times shown below are only valid for the power-up sequence where VIN and VBIAS are already in steady state condition, and the ON pin is asserted high.

Table 1. Rise Times On a Typical Device

CTx (pF) RISE TIME (µs) 10% - 90%, CL = 0.1 µF, CIN = 1 µF, RL = 10 Ω
TYPICAL VALUES at 25°C, 25 V X7R 10% CERAMIC CAPACITOR
5 V 3.3 V 1.8 V 1.5 V 1.2 V 1.05 V 0.8 V
0 127 93 62 55 51 46 42
220 475 314 188 162 141 125 103
470 939 637 359 304 255 218 188
1000 1869 1229 684 567 476 414 344
2200 4020 2614 1469 1211 1024 876 681
4700 8690 5746 3167 2703 2139 1877 1568
10000 18360 12550 6849 5836 4782 4089 3449

8.3.3 Quick Output Discharge

The TPS22967 includes a Quick Output Discharge (QOD) feature. When the switch is disabled, a discharge resistor is connected between VOUT and GND. This resistor has a typical value of 225 Ω and prevents the output from floating while the switch is disabled.

8.4 Device Functional Modes

Table 2 describes the functional state of the load switch as determined by the ON pin.

Table 2. Functional Table

ON VIN to VOUT VOUT to GND
L Off On
H On Off

 
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