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TPS54308

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4.5-V to 28-V Input, 3-A output, synchronous 350-kHz FCCM step-down converter

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Data sheet

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TPS62933 ACTIVE 3.8-V to 30-V, 3-A, 200-kHz to 2.2-MHz, low-IQ synchronous buck converter in SOT-583 package 30 VIN with higher frequency and lower IQ.

TPS54308

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 28 Switching frequency (min) (kHz) 350 Switching frequency (max) (kHz) 350 Features Enable, Forced PWM, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode current mode Vout (min) (V) 1 Vout (max) (V) 26 Iq (typ) (µA) 300 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4.5 Vin (max) (V) 28 Switching frequency (min) (kHz) 350 Switching frequency (max) (kHz) 350 Features Enable, Forced PWM, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode current mode Vout (min) (V) 1 Vout (max) (V) 26 Iq (typ) (µA) 300 Duty cycle (max) (%) 100
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • 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) PDF | HTML 16 Apr 2021
Application note Peak Current Mode Converter Secondary Stage Filter Design for Low Ripple Power – Part I: Filter Design for Out PDF | HTML 27 Feb 2024
Application note Peak Current Mode Converter Secondary Stage Filter Design for Low Ripple Power – Part II: Hybrid Sense Network PDF | HTML 27 Feb 2024
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
Application note Using the TPS54x02 to Create an Inverting Power Supply 15 Jun 2018
EVM User's 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 (...)
User guide: PDF
Not available on TI.com
Simulation model

TPS54308 Unencrypted PSpice Transient Model Package (Rev. C)

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

SLUC685 — TPS54308 Design Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
TPS54308 — 4.5-V to 28-V Input, 3-A output, synchronous 350-kHz FCCM step-down converter
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Reference designs

TIDA-010216 — 16s battery pack reference design with low-side MOSFET control for large capacity applications

This reference design is a low standby and ship-mode current consumption and high cell voltage accuracy 16s Lithium-ion (Li-ion) LiFePO4 battery pack. The design monitors each cell voltage, pack current, cell and MOSFET temperature with high accuracy and protects the Li-ion and LiFePO4 battery (...)
Design guide: PDF
Reference designs

PMP40994 — 4-W dual-channel isolated gate driver with 1500-V isolation for IGBT reference design

This reference design is a compact, dual-channel output isolated gate driver board design for insulated-gate bipolar transistor (IGBT) in solar inverter, PCS, UPS and motor driver applications. The isolated bias power is implemented with fly-buck topology using TPS54308 which offers two-channel (...)
Test report: PDF
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 (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23-THN (DDC) 6 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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