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  • TPS568215OA 4.5-V to 17-V Input , 8-A Synchronous Step-Down SWIFT™ Converter

    • SLVSDU7 January   2017 TPS568215OA

      PRODUCTION DATA.  

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  • TPS568215OA 4.5-V to 17-V Input , 8-A Synchronous Step-Down SWIFT™ Converter
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  PWM Operation and D-CAP3 Control
      2. 7.3.2  Out-of-Audio Operation
      3. 7.3.3  4.7 V LDO and External Bias
      4. 7.3.4  MODE Selection
      5. 7.3.5  Soft Start and Pre-biased Soft Start
      6. 7.3.6  Enable and Adjustable UVLO
      7. 7.3.7  Power Good
      8. 7.3.8  Over Current Protection and Under Voltage Protection
      9. 7.3.9  Out-of-Bounds Operation
      10. 7.3.10 UVLO Protection
      11. 7.3.11 Thermal Shutdown
      12. 7.3.12 Output Voltage Discharge
    4. 7.4 Device Functional Modes
      1. 7.4.1 Light Load Operation
      2. 7.4.2 Standby Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Component Selection
          1. 8.2.2.1.1 Output Voltage Set Point
          2. 8.2.2.1.2 Switching Frequency and Mode Selection
          3. 8.2.2.1.3 Inductor Selection
          4. 8.2.2.1.4 Output Capacitor Selection
          5. 8.2.2.1.5 Input Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RNN|18
    • MPQF456D
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • slvsdu7_oa
  • slvsdu7_pm
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DATA SHEET

TPS568215OA 4.5-V to 17-V Input , 8-A Synchronous Step-Down SWIFT™ Converter

1 Features

  • Integrated 19-mΩ and 9.4-mΩ MOSFETs
  • Selectable FSW of 400 kHz, 800 kHz or 1.2 MHz
  • Out-of-Audio Feature to Keep Switching Frequency Out of Audio Frequency Range
  • Adjustable Current Limit Settings with Hiccup Re-start
  • 0.6 V ±1% Reference Voltage Across Full Temperature Range
  • Optional External 5-V Bias Support for Enhanced Efficiency
  • D-CAP3™ Control Mode for Fast Transient Response
  • 0.6 V to 5.5 V Output Voltage Range
  • Supports all Ceramic Capacitors
  • Monotonic Startup into Pre-biased Outputs
  • Adjustable Soft Start with a Default 1-ms Soft Start Time
  • –40°C to 150°C Operating Junction Temperature
  • Small 3.5-mm x 3.5-mm HotRod™ QFN Package

2 Applications

  • Server and Storage
  • Set top Box, High-End DTV
  • Laptop and Gaming Systems

3 Description

The TPS568215OA is TI's smallest monolithic 8-A synchronous buck converter with an adaptive on-time D-CAP3™ control mode. The device integrates low RDS(on) power MOSFETs that enable high efficiency and it offers ease-of-use with minimal external component count for space-conscious power systems. Key features include a very accurate reference voltage, fast load transient response, Out-of-Audio mode, adjustable current limit and no requirement for external compensation. A forced continuous conduction mode helps meet tight voltage regulation accuracy requirements for performance DSPs and FPGAs. The TPS568215OA is available in a thermally enhanced 18-pin HotRod™ QFN package and is designed to operate from –40°C to 150°C junction temperature. TPS568215OA is pin to pin compatible with TPS568215 and TPS56C215 which gives the user flexibility to pick solutions from 6A to 12A in the same footprint.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS568215OA VQFN (18) 3.50 mm x 3.50 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

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Typical Application Schematic

TPS568215OA TPS568215OA_Schematic.gif


Efficiency vs Output Current

TPS568215OA C011_SLVSDI8.png

4 Revision History

DATE REVISION NOTES
January 2017 * Initial release.

5 Pin Configuration and Functions

RNN Package
18-Pin VQFN
TPS568215OA Pinout_RNN18_SLVSD05.gif

Pin Functions

PIN I/O DESCRIPTION
NO. NAME
1 BOOT I Supply input for the gate drive voltage of the high-side MOSFET. Connect a 0.1-µF bootstrap capacitor between BOOT and SW.
2,11 VIN P Input voltage supply pin for the control circuitry. Connect the input decoupling capacitors between VIN and PGND.
3, 4, 5,
8, 9, 10		 PGND G Power GND terminal for the controller circuit and the internal circuitry.
6, 7 SW O Switch node terminal. Connect the output inductor to this pin.
12 AGND G Ground of internal analog circuitry. Connect AGND to PGND plane.
13 FB I Converter feedback input. Connect to the resistor divider between output voltage and AGND.
14 SS O

Soft-Start time selection pin. Connecting an external capacitor sets the soft-start time and if no external capacitor is connected, the soft-start time in 1ms.
15 EN I Enable input control, leaving this pin floating enables the converter. It can also be used to adjust the input UVLO by connecting to the resistor divider between VIN and EN.
16 PGOOD O Open Drain Power Good Indicator, it is asserted low if output voltage is out of PGOOD threshold, Overvoltage or if the device is under thermal shutdown, EN shutdown or during soft start.
17 VREG5 I/O 4.7-V internal LDO output which can also be driven externally with a 5V input. This pin supplies voltage to the internal circuitry and gate driver. Bypass this pin with a 4.7-μF capacitor.
18 MODE I Switching Frequency, Current Limit selection and Light load operation mode selection pin. Connect this pin to a resistor divider from VREG5 and AGND for different MODE options shown in table 4.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
Input Voltage VIN –0.3 20 V
SW –2 19
SW(10 ns transient) –3 20
EN –0.3 6.5
BOOT –SW –0.3 6.5
BOOT –0.3 25.5
SS, MODE, FB –0.3 6.5
VREG5 –0.3 6
Output Voltage PGOOD –0.3 6.5 V
Output Current, IOUT(2) 10 A
Operating junction temperature, TJ –40 150 °C
Storage temperature, Tstg –55 150 °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) In order to be consistent with the TI reliability requirement of 100k continuos Power-On-Hours with 105°C junction temperature at the max output current of 10A, the converter's duty cycle should be limited to 60% operation as to prevent electromigration failure in the solder. If higher duty cycle is required at 10A load the total power on hours or the junction temperature have to be reduced.

6.2 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) ±500
(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.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Input Voltage VIN 4.5 17 V
SW –1.8 17
BOOT –0.1 23.5
VREG5 –0.1 5.2
TJ Operating junction temperature -40 150 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS568215OA UNIT
RNN (VQFN)
18 PINS
RθJA Junction-to-ambient thermal resistance 42.3 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 23.9 °C/W
RθJB Junction-to-board thermal resistance 10.0 °C/W
ψJT Junction-to-top characterization parameter 0.5 °C/W
ψJB Junction-to-board characterization parameter 10.0 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.5 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

TJ = –40°C to 150°C, VIN=12V (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IIN VIN supply current TJ = 25°C, VEN=5 V, non switching 850 µA
IVINSDN VIN shutdown current TJ = 25°C, VEN=0 V 7 µA
LOGIC THRESHOLD
VENH EN H-level threshold voltage 1.175 1.225 1.3 V
VENL EN L-level threshold voltage 1.025 1.104 1.15 V
VENHYS 0.121 V
IENp1 EN pull-up current VEN = 1.0 V 0.35 1.91 2.95 µA
IENp2 VEN = 1.3 V 3 4.197 5.5 µA
FEEDBACK VOLTAGE
VFB FB voltage TJ = 25°C 598 600 602 mV
TJ = 0°C to 85°C 597.5 600 602.5 mV
TJ = –40°C to 85°C 594 600 602.5 mV
TJ = –40°C to 150°C 594 600 606 mV
LDO VOLTAGE
VREG5 LDO Output voltage TJ = –40°C to 150°C 4.58 4.7 4.83 V
ILIM5 LDO Output Current limit TJ = –40°C to 150°C 100 150 200 mA
MOSFET
RDS(on)H High side switch resistance TJ = 25°C, VVREG5 = 4.7 V 19 mΩ
RDS(on)L Low side switch resistance TJ = 25°C, VVREG5 = 4.7 V 9.4 mΩ
SOFT START
Iss Soft start charge current TJ = -40°C to 150°C 4.9 6 7.1 µA
CURRENT LIMIT
IOCL Current Limit (Low side sourcing) ILIM-1 option, Valley Current 6 7.1 8.15 A
ILIM option, Valley Current 8 9.4 10.8 A
ILIM+1 option, Valley Current 10 11.8 13.5 A
Current Limit (Low side negative) Valley Current 3 A
POWER GOOD
VPGOODTH PGOOD threshold VFB falling (fault) 84% %VREF
VFB rising (good) 93% %VREF
VFB rising (fault) 116% %VREF
VFB falling (good) 107% %VREF
OUTPUT UNDERVOLTAGE PROTECTION
VUVP Output UVP threshold Hiccup detect 68% x VFB
THERMAL SHUTDOWN
TSDN Thermal shutdown threshold Shutdown temperature 160 °C
Hysteresis 15 °C
TSDN VREG5 VREG5 thermal shutdown threshold Shutdown temperature 171 °C
Hysteresis 18 °C
UVLO
UVLO UVLO threshold VREG5 rising voltage 4.1 4.3 4.5 V
VREG5 falling voltage 3.34 3.57 3.8 V
VREG5 hysteresis 730 mV

6.6 Timing Requirements

PARAMETER CONDITIONS MIN TYP MAX UNIT
ON-TIME TIMER CONTROL
tON SW On Time VIN = 12 V, VOUT=3.3 V, FSW = 800 kHz 310 340 380 ns
tON min SW Minimum on time VIN = 17 V, VOUT=0.6 V, FSW= 1200 kHz 54 ns
tOFF SW Minimum off time 25°C, VFB=0.5 V 310 ns
FSWOOA OOA Switching Frequency TJ = -40°C to 150°C, No Load 20 27 KHz
SOFT START
tSS Soft start time Internal soft start time 1.045 ms
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
tUVPDEL Output Hiccup delay relative to SS time UVP detect 1 cycle
tUVPEN Output Hiccup enable delay relative to SS time UVP detect 7 cycle

6.7 Typical Characteristics

TPS568215OA C001_SLVSDU7.png
Figure 1. Quiescent Current vs Temperature
TPS568215OA C003_SLVSDI8.png
Figure 3. Feedback Voltage vs Temperature
TPS568215OA C005_SLVSDI8.png
Figure 5. Low-side Rdson vs Temperature
TPS568215OA C007_SLVSDI8.png
Figure 7. Enable Pull-Up Current, VEN =1.0V
TPS568215OA C009_SLVSDI8.png
Figure 9. PGOOD Threshold vs Temperature
TPS568215OA C002_SLVSDU7.png
Figure 11. Efficiency, Mode = OOA, FSW = 400kHz
TPS568215OA C003_SLVSDU7.png
Figure 13. Efficiency, Mode = OOA, FSW = 1200kHz
TPS568215OA C017_SLVSDI8.png
Figure 15. Load Regulation, FSW = 400kHz
TPS568215OA C019_SLVSDI8.png
Figure 17. FSW Load Regulation, Mode = FCCM, FSW = 800kHz
TPS568215OA C004_SLVSDU7.png
Figure 19. FSW Load Regulation, Mode = OOA, VIN = 12V, VOUT=1.2V
TPS568215OA C002_SLVSDI8.png
Figure 2. Shutdown Current vs Temperature
TPS568215OA C004_SLVSDI8.png
Figure 4. High-side Rdson vs Temperature
TPS568215OA C006_SLVSDI8.png
Figure 6. Soft-Start Charge Current vs Temperature
TPS568215OA C008_SLVSDI8.png
Figure 8. Enable Pull-Up Current, VEN =1.3V
TPS568215OA C010_SLVSDI8.png
Figure 10. Valley Current Limit vs Temperature
TPS568215OA C014_SLVSDI8.png
Figure 12. Efficiency, Mode = FCCM, FSW = 400kHz
TPS568215OA C016_SLVSDI8.png
Figure 14. Efficiency, Mode = FCCM, FSW = 1200kHz
TPS568215OA C018_SLVSDI8.png
Figure 16. FSW Load Regulation, Mode = FCCM, FSW = 400kHz
TPS568215OA C020_SLVSDI8.png
Figure 18. FSW Load Regulation, Mode = FCCM, FSW = 1200kHz

 
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