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TPS51124 ACTIVE 4.5-V to 28-V, dual-synchronous buck controller for low output voltage rails This upgraded product offers a Smaller 4x4mm QFN package.

Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 1 Vout (Max) (V) 5.5 Iout (Max) (A) 20 Iq (Typ) (uA) 750 Switching frequency (Min) (kHz) 180 Switching frequency (Max) (kHz) 500 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog
Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 1 Vout (Max) (V) 5.5 Iout (Max) (A) 20 Iq (Typ) (uA) 750 Switching frequency (Min) (kHz) 180 Switching frequency (Max) (kHz) 500 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog
VQFN (RHB) 32 25 mm² 5.0 x 5.0 VQFN (RHB) 32 25 mm² 5 x 5
  • 3.3-V and 5-V 100-mA Bootstrapped Standby
    Regulators with Independent Enables
  • Selectable D-CAP™ Mode Enables Fast Transient
    Response Less than 100 ns
  • Selectable Low Ripple Current Mode
  • Less than 1% Internal Reference Accuracy
  • Selectable PWM-only/Auto-skip Modes
  • Low-side RDS(on) Loss-less Current Sensing
  • RSENSE Accurate Current Sense Option
  • Internal Soft-Start and Integrated VOUT Discharge
    Transistors
  • Integrated 2-V Reference
  • Adaptive Gate Drivers with Integrated Boost Diode
  • Powergood for Each Channel with Delay Timer
  • Fault Disable Mode
  • Supply Input Voltage Range: 4.5 V to 28 V
  • 3.3-V and 5-V 100-mA Bootstrapped Standby
    Regulators with Independent Enables
  • Selectable D-CAP™ Mode Enables Fast Transient
    Response Less than 100 ns
  • Selectable Low Ripple Current Mode
  • Less than 1% Internal Reference Accuracy
  • Selectable PWM-only/Auto-skip Modes
  • Low-side RDS(on) Loss-less Current Sensing
  • RSENSE Accurate Current Sense Option
  • Internal Soft-Start and Integrated VOUT Discharge
    Transistors
  • Integrated 2-V Reference
  • Adaptive Gate Drivers with Integrated Boost Diode
  • Powergood for Each Channel with Delay Timer
  • Fault Disable Mode
  • Supply Input Voltage Range: 4.5 V to 28 V

The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

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Technical documentation

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Type Title Date
* Data sheet TPS51120 Dual, Synchronous Step-Down Controller With 100-mA Standby Regulators for Notebook System Power datasheet (Rev. C) 29 Jan 2015
User guide TPS51120 Buck Controller Evaluation Module User's Guide (Rev. B) 04 Mar 2022

Design & development

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

Evaluation board

TPS51120EVM-001 — TPS51120 Evaluation Module

The TPS51120EVM-001 evaluation module utilizes the TPS51120 in a high efficiency, dual synchronous buck converter providing 5 V at 6 A and 3.3 V at 6 A from 8 V to 25 V input. The user’s guide describes the TPS51120EVM-001 performance in D-CAP™ mode and RDS(on) current sensing.

The TPS51120 is a (...)

Simulation model

TPS51120 PSpice Transient Model

SLIM108.ZIP (79 KB) - PSpice Model
Simulation model

TPS51120 TINA-TI (Transient) Spice Model

SLVM103.ZIP (83 KB) - TINA-TI Spice Model
Simulation model

TPS51120 TINA-TI (Transient) Reference Design

SLVM104.TSC (318 KB) - TINA-TI Reference Design
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

PMP1967 — Synchronous Buck Converter (5V @ 5A)

This reference evaluation module, featuring the TPS51120, achieves low stand-by current high efficiency solution for PC I/O rails.
Package Pins Download
VQFN (RHB) 32 View options

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