TPS5431DDA

Part: TPS5430/TPS5431 — Texas Instruments

Type: Synchronous Buck Converter

Description: 5.5–36 V input (TPS5430) or 5.5–23 V input (TPS5431), 3 A continuous output current synchronous buck converter with integrated 110 mΩ MOSFET and 95% peak efficiency.

Operating Conditions:

• Supply voltage: 5.5–36 V (TPS5430), 5.5–23 V (TPS5431)
• Operating temperature: -40 to 125 °C
• Switching frequency: 500 kHz
• Output voltage range: Adjustable down to 1.22 V

Absolute Maximum Ratings:

• Max supply voltage (VIN): 40 V (TPS5430), 25 V (TPS5431)
• Max junction temperature: 150 °C
• Max storage temperature: 150 °C

Key Specs:

• Quiescent current (not switching): 3 mA (typ)
• Shutdown quiescent current: 18 μA (typ)
• UVLO start threshold voltage: 5.3 V (typ)
• Voltage reference accuracy (TJ = 25 °C): 1.221 V (typ), 1.202 V (min), 1.239 V (max)
• Internally set free-running frequency: 500 kHz (typ), 400 kHz (min), 600 kHz (max)
• Internal slow-start time: 8 ms (typ)
• Current limit: 5 A (typ), 4 A (min), 6 A (max)
• Thermal shutdown trip point: 162 °C (typ), 135 °C (min)
• High-side power MOSFET switch rDS(on): 110 mΩ (typ), 230 mΩ (max)

Features:

• Up to 3-A continuous (4-A peak) output current
• High efficiency up to 95%
• Adjustable output voltage down to 1.22 V with 1.5% initial accuracy
• Internal compensation minimizes external parts count
• Fixed 500 kHz switching frequency
• Improved line regulation and transient response by input voltage feed forward
• System protected by overcurrent limiting, overvoltage protection and thermal shutdown
• -40 °C to 125 °C operating junction temperature range
• Available in small thermally enhanced 8-pin SOIC PowerPAD™ package

Applications:

• Consumer: Set-top Box, DVD, LCD Displays
• Industrial and Car Audio Power Supplies
• Battery Chargers, High Power LED Supply
• 12-V/24-V Distributed Power Systems

Package:

• Thermally Enhanced SOIC (DDA) (8-pin)

• Wide Input Voltage Range:

• Up to 3-A Continuous (4-A Peak) Output Current

• High Efficiency up to 95% Enabled by 110-m Ω Integrated MOSFET Switch

• Wide Output Voltage Range: Adjustable Down to 1.22 V with 1.5% Initial Accuracy

• Internal Compensation Minimizes External Parts Count

• Fixed 500 kHz Switching Frequency for Small Filter Size

• Improved Line Regulation and Transient Response by Input Voltage Feed Forward

• System Protected by Overcurrent Limiting, Overvoltage Protection and Thermal Shutdown

• -40 ° C to 125 ° C Operating Junction Temperature Range

• Available in Small Thermally Enhanced 8-Pin SOIC PowerPAD™ Package

• For SWIFT™ Documentation, Application Notes and Design Software, See the TI Website at www.ti.com/swift

• TPS5430: 5.5 V to 36 V

• TPS5431: 5.5 V to 23 V

• Consumer: Set-top Box, DVD, LCD Displays
• Industrial and Car Audio Power Supplies
• Battery Chargers, High Power LED Supply
• 12-V/24-V Distributed Power Systems

over operating free-air temperature range (unless otherwise noted) (1)(2)

• (1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. 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) Approaching the absolute maximum rating for the VIN pin may cause the voltage on the PH pin to exceed the absolute maximum rating.

The TPS5430/TPS5431 protects itself from overheating with an internal thermal shutdown circuit. If the junction temperature exceeds the thermal shutdown trip point, the voltage reference is grounded and the high-side MOSFET is turned off. The part is restarted under control of the slow start circuit automatically when the junction temperature drops 14 ° C below the thermal shutdown trip point.

TPS5431