TPS5431DDA

Part: TPS5430 / TPS5431 — Texas Instruments

Type: Step-Down (Buck) DC/DC Converter

Description: 5.5 V to 36 V input, 3 A continuous (4 A peak) step-down PWM converter with integrated 110 mΩ high-side MOSFET and up to 95% efficiency.

Operating Conditions:

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

Absolute Maximum Ratings:

• Max supply voltage: -0.3 to 40 V (TPS5430), -0.3 to 25 V (TPS5431)
• Max junction/storage temperature: 150 °C (operating junction -40 to 150 °C, storage -65 to 150 °C)

Key Specs:

• High-side MOSFET on-resistance: 110 mΩ typ, 230 mΩ max (VIN = 12.0 V, TJ = -40 to 125 °C)
• Current limit threshold: 4 A min, 5 A typ, 6 A max
• Switching frequency: 400 kHz min, 500 kHz typ, 600 kHz max
• Reference voltage: 1.221 V typ, 1.196 V min, 1.245 V max (IO = 0 A to 3 A)
• Quiescent current (operating, non-switching): 3 mA typ, 4.4 mA max (VSENSE = 2 V)
• Shutdown current: 18 μA typ, 50 μA max (ENA = 0 V)
• UVLO start threshold: 5.3 V typ, 5.5 V max (330 mV typ hysteresis)
• Maximum duty cycle: 87% min, 89% typ

Features:

• Integrated 110 mΩ N-channel high-side power MOSFET
• Internal compensation simplifies design and minimizes external component count
• Input voltage feed-forward for improved line regulation and transient response
• Active-high enable with 18 μA typical shutdown current
• Cycle-by-cycle and hiccup mode overcurrent protection
• Overvoltage protection and thermal shutdown with automatic recovery
• Internal 8 ms slow-start circuit

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:

• 8-pin SOIC PowerPAD (DDA)

• 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

TJ = -40 ° C to 125 ° C, VIN = 12.0 V (unless otherwise noted)

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

TPS5431