Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 1 Vout (Max) (V) 26 Iout (Max) (A) 3 Iq (Typ) (uA) 300 Switching frequency (Min) (kHz) 350 Switching frequency (Max) (kHz) 350 Features Enable, Forced PWM, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable, Soft Start Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 1 Vout (Max) (V) 26 Iout (Max) (A) 3 Iq (Typ) (uA) 300 Switching frequency (Min) (kHz) 350 Switching frequency (Max) (kHz) 350 Features Enable, Forced PWM, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable, Soft Start Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6
  • 4.5-V to 28-V wide input voltage range
  • Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, continuous output current
  • Low 2-µA shutdown, 300-µA quiescent current
  • Internal 5-mS soft start
  • Fixed 350-kHz switching frequency
  • Peak current mode control
  • Internal loop compensation
  • Overcurrent protection for both MOSFETs with hiccup mode protection
  • Overvoltage protection
  • Thermal shutdown
  • SOT-23 (6) package
  • Create a custom design using the TPS54308 with the WEBENCH Power Designer
  • 4.5-V to 28-V wide input voltage range
  • Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, continuous output current
  • Low 2-µA shutdown, 300-µA quiescent current
  • Internal 5-mS soft start
  • Fixed 350-kHz switching frequency
  • Peak current mode control
  • Internal loop compensation
  • Overcurrent protection for both MOSFETs with hiccup mode protection
  • Overvoltage protection
  • Thermal shutdown
  • SOT-23 (6) package
  • Create a custom design using the TPS54308 with the WEBENCH Power Designer

The TPS54308 is a 4.5-V to 28-V input voltage range, 3-A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation, and 5-ms internal soft start to reduce component count.

By integrating the MOSFETs and employing the SOT-23 package, the TPS54308 achieves high power density and offers a small footprint on the PCB.

The TPS54308 operates in force continuous conduction mode (FCCM) during light load conditions. The switching frequency is maintained at an almost constant level over entire load range.

Cycle-by-cycle current limit in both high-side MOSFETs protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit, which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.

The TPS54308 is a 4.5-V to 28-V input voltage range, 3-A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation, and 5-ms internal soft start to reduce component count.

By integrating the MOSFETs and employing the SOT-23 package, the TPS54308 achieves high power density and offers a small footprint on the PCB.

The TPS54308 operates in force continuous conduction mode (FCCM) during light load conditions. The switching frequency is maintained at an almost constant level over entire load range.

Cycle-by-cycle current limit in both high-side MOSFETs protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit, which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.

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Technical documentation

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Type Title Date
* Data sheet TPS54308 4.5-V to 28-V Input, 3-A Output, Synchronous 350-kHz FCCM Step-Down Converter in SOT23 Package datasheet (Rev. A) 16 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Application note Designing a Simple and Low-Cost Flybuck Solution With the TPS54308 (Rev. A) 14 Oct 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Application note Using the TPS54x02 to Create an Inverting Power Supply 15 Jun 2018
User guide TPS54308EVM-876 3-A Regulator Evaluation Module 30 May 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS54308EVM-876 — TPS54308 4.5V to 28V Input, 3A Output Synchronous Step-Down Converter Evaluation Module

The TPS54308 DC/DC converter is designed to provide up to a 3-A output from an input voltage source of 8 V to 28 V.  In order to aviod swtiching frequency drop into audio and introduce the audible issue under light load, the TPS54308 operates under force PWRM mode.

Th TPS54308EVM-876 evaluation (...)
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Simulation model

TPS54308 Unencrypted PSpice Transient Model Package (Rev. C)

SLUM585C.ZIP (798 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Calculation tool

TPS54308 Design Calculator

SLUC685.ZIP (117 KB)
Reference designs

PMP40589 — 2-W auxiliary power supply for a single IGBT driver reference design

This reference design is a dual-output, isolated fly-buck power module for a single IGBT driver bias using the TPS54308 synchronous buck converter. The converter generates one non-isolated output of +3.3 V with 400-mA current capability and two isolated outputs of +15 V and -8 V with 80-mA current (...)
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SOT-23-THIN (DDC) 6 View options

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