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LM25143

ACTIVE

3.5-V to 42-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ

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Data sheet

LM25143

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 47 Iout (max) (A) 100 Operating temperature range (°C) -40 to 150 Control mode current mode Rating Catalog
Vin (max) (V) 47 Iout (max) (A) 100 Operating temperature range (°C) -40 to 150 Control mode current mode Rating Catalog
VQFN (RHA) 40 36 mm² 6 x 6
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 36 V
    • 150°C maximum junction temperature
    • 4-µA typical shutdown mode current
    • 15-µA typical no-load standby current
  • Two interleaved synchronous buck channels
    • Dual channel or single-output multiphase
    • 65-ns tON(min) for high VIN/VOUT ratio
    • 60-ns tOFF(min) for low dropout
  • Inherent protection features for robust design
    • Shunt or inductor DCR current sensing
    • Hiccup mode overcurrent protection
    • Independent ENABLE and PGOOD functions
    • Adjustable output voltage soft start
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for CISPR 11 and CISPR 32 class B conducted and radiatedEMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
  • 100-kHz to 2.2-MHz switching frequency
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM modes
  • 6-mm × 6-mm VQFN-40 package
  • Create a custom design using the LM25143 with WEBENCH Power Designer
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 36 V
    • 150°C maximum junction temperature
    • 4-µA typical shutdown mode current
    • 15-µA typical no-load standby current
  • Two interleaved synchronous buck channels
    • Dual channel or single-output multiphase
    • 65-ns tON(min) for high VIN/VOUT ratio
    • 60-ns tOFF(min) for low dropout
  • Inherent protection features for robust design
    • Shunt or inductor DCR current sensing
    • Hiccup mode overcurrent protection
    • Independent ENABLE and PGOOD functions
    • Adjustable output voltage soft start
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for CISPR 11 and CISPR 32 class B conducted and radiatedEMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
  • 100-kHz to 2.2-MHz switching frequency
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM modes
  • 6-mm × 6-mm VQFN-40 package
  • Create a custom design using the LM25143 with WEBENCH Power Designer

The LM25143 is a 42-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, the device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on time of 65 ns provides large step-down ratios, enabling the direct conversion from 12-V or 24-V inputs to low-voltage rails for reduced system complexity and cost. The LM25143 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM25143 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

The LM25143 is a 42-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, the device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on time of 65 ns provides large step-down ratios, enabling the direct conversion from 12-V or 24-V inputs to low-voltage rails for reduced system complexity and cost. The LM25143 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM25143 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.
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Technical documentation

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Type Title Date
* Data sheet LM25143 3.5-V to 42-V Dual Synchronous Buck DC/DC Controller With Ultra-Low IQ datasheet PDF | HTML 18 Mar 2022
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
Functional safety information LM25143 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 17 Feb 2022
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Application note LM5143-Q1 4-phase Buck Regulator Design (Rev. A) PDF | HTML 28 Apr 2020

Design & development

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

Evaluation board

LM5143-Q1EVM-2100 — Dual-channel automotive synchronous buck controller evaluation module

The LM5143-Q1-EVM2100 high density evaluation module (EVM) is designed to showcase the performance of the LM5143-Q1 high performance, dual-channel, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 3.5 V to 36 V to deliver fixed 5-V and 3.3-V outputs (...)
User guide: PDF
Not available on TI.com
Calculation tool

LM5143DESIGN-CALC — LM5143-Q1 Controller Quickstart Design Tool

This stand-alone tool facilitates and assists with the design of a DC/DC buck regulator based on the LM5143-Q1 synchronous buck DC/DC controller with low IQ. The user can expeditiously arrive at an optimized design to meet the application requirements.

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM25143 — 3.5-V to 42-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ LM25143-Q1 — Automotive, 3.5-V to 42-V low-Iq, dual output, stackable synchronous buck DC-DC controller LM5143 — 3.5-V to 65-V, dual-output, stackable, synchronous buck DC/DC controller with ultra-low IQ LM5143-Q1 — 3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller LM5143A-Q1 — Automotive, 3.5-V to 65-V low-IQ, dual output, stackable synchronous buck DC-DC controller
Hardware development
Evaluation board
LM5143-Q1EVM-2100 — Dual-channel automotive synchronous buck controller evaluation module
Software
Calculation tool
LM5143DESIGN-CALC — LM5143-Q1, LM5143A-Q1, LM5143, LM25143-Q1 and LM25143 controller quick start design tool
Download
Reference designs

PMP31202 — Four-phase buck converter 700-W reference design

This reference design is a 700-W buck converter using the LM5143A-Q1 device. Due to low dead times, ultra-strong drivers and the ability to adjust the rising and falling edges individually, the resulting efficiency is 98%. Because of reduced loss, the board area measures 150 mm × 125 mm, with a (...)
Test report: PDF
Package Pins Download
VQFN (RHA) 40 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

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