Home Power management DC/DC switching regulators Step-down (buck) regulators Buck converters (integrated switch)

TPS54308

ACTIVE

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

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
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.

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) (mA) 0.3 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 Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 100 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 28 Vout (min) (V) 1 Vout (max) (V) 26 Iout (max) (A) 3 Iq (typ) (mA) 0.3 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 Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 100 Type Converter
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.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
TPS54302 ACTIVE 4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter Equivalent part with ECO-mode.
Similar functionality to the compared device
TPSM84209 ACTIVE 4.5-V to 28-V input, 1.2-V to 6-V output, 2.5-A power module Simplify your design with an integrated-inductor power module.

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
Calculation tool

SLUC685 TPS54308 Design Calculator

Supported products & hardware

Supported products & hardware

Products
Buck converters (integrated switch)
TPS54308 4.5-V to 28-V Input, 3-A output, synchronous 350-kHz FCCM step-down converter
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 (...)
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 Download
SOT-23-THN (DDC) 6 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos