Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 24 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 10 Iq (Typ) (uA) 110 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 800 Features Enable, Light Load Efficiency, Output Discharge, Over Current Protection, Power Good, Soft Start Adjustable, Synchronous Rectification, UVLO Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN-HR (RJE) 20 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • Input voltage range: 4.5 V to 24 V
  • Output voltage range: 0.6 V to 5.5 V
  • Supports 10-A continuous output current
  • D-CAP3™ architecture control for fast transient response
  • 0.6 V ± 1% feedback voltage accuracy (25°C)
  • Integrated 17-mΩ and 5.9-mΩ FETs
  • ULQ™ operation (110 µA) to enable long battery life during system standby
  • Selectable Eco-mode™ and Out-of-Audio™ by MODE pin
  • 500-kHz and 800-kHz selectable switching frequency
  • Adjustable soft-start time with default internal 1.2 ms
  • Large duty cycle operation
  • Integrated power-good indicator
  • Built-in output discharge function
  • Cycle-by-cycle overcurrent protection
  • Latched output OV and UV protections
  • Non-latched UVLO and OT protections
  • -40°C to 125°C Operating junction temperature
  • 20-pin 3.0-mm × 3.0-mm HotRod™ VQFN package
  • Pin-to-pin compatible with 12-A TPS56C230
  • Create a custom design using the TPS51397A with the WEBENCH® Power Designer

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The device is a monolithic 10-A synchronous buck converter with integrated MOSFETs that enable high efficiency and offers ease-of-use with minimum external component count for space-conscious power systems.

The TPS51397A employs D-CAP3™ control that provides fast transient response and excellent line and load regulation with internal compensation. The ULQ™ (Ultra Low Quiescent) feature is extremely beneficial for long battery life in low power operation. The large duty operation greatly improves the load transient performance when input voltage is low.

The MODE pin can be used to set Eco-mode™ or Out-of-Audio™ (OOA) mode for light-load operation and 500-kHz or 800-kHz switching frequency. The Eco-mode™ maintains high efficiency during light load operation. The OOA mode keeps the switching frequency above audible frequency with minimum reduction in efficiency.

The device supports both internal and external soft-start options. It has an internal fixed soft-start time of 1.2 ms. If the application needs a longer soft-start time, the external SS pin can be connected to an external capacitor.

The TPS51397A integrates a power-good indicator and provides an output discharge function. It provides complete protection including OVP, UVP, OCP, OTP, and UVLO. The device is available in a 20-pin 3.0-mm x 3.0-mm HotRod™ package and the junction temperature is specified from –40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet TPS51397A 4.5-V to 24-V, 10-A Synchronous Buck Converter with ULQ™ Operation datasheet (Rev. A) Oct. 12, 2020
Application note Stability Analysis and Design of D-CAP2 and D-CAP3 Converter Jun. 09, 2021
Application note Measuring the Bode Plot for D-CAPx DC/DC Converters May 25, 2021
User guide TPS51397A Step-Down Converter Evaluation Module User's Guide (Rev. A) Apr. 23, 2021
Application note Non-Isolated DC/DC Solutions for Alder Lake in Notebook Computing Applications Jan. 08, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide
The TPS51397AEVM evaluation module (EVM) is used to evaluate the TPS51397A device. The TPS51397A is a synchronous buck converter designed to provide up to a 10-A output. The input voltage is rated for 4.5 V to 24 V. The TPS51397A uses a proprietary D-CAP3™ control mode. It provides a (...)
  • 4.5-V to 24-V input voltage range
  • 0.6-V to 5.5-V output voltage range
  • Up to 10-A output Current
  • Eco-mode and OOA mode
  • Fast transient response
  • 20-pin 3.0-mm × 3.0-mm HotRod™ VQFN package

Design tools & simulation

SLUM756.ZIP (151 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

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