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LM25148

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42-V synchronous buck DC/DC controller with ultra-low IQ

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Data sheet

LM25148

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Controller Iout (max) (A) 20 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 36 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 9.5 Duty cycle (max) (%) 99 Number of phases 2 EMI features Spread Spectrum
Rating Catalog Topology Buck Controller Iout (max) (A) 20 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 36 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 9.5 Duty cycle (max) (%) 99 Number of phases 2 EMI features Spread Spectrum
VQFN (RGY) 24 19.25 mm² 5.5 x 3.5
  • Functional Safety-Capable
  • Integrated EMI mitigation
    • Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
    • Optimized for CISPR 32 Class B requirements
  • 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, 12-V, or adjustable output from 0.8 V to 36 V
    • 150°C maximum junction temperature
    • Lossless DCR or shunt current sensing
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 9.5 µA
    • Internal 3-ms soft-start ramp
    • Stackable up to two phases
    • Advanced dropout with frequency foldback
    • Internal bootstrap diode
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
    • Selectable PFM or FPWM modes
  • Inherent protection features for robust design
    • Internal hiccup mode overcurrent protection
    • ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Internal or external loop compensation
    • Thermal shutdown protection with hysteresis
  • Create a custom design using the LM25148 with WEBENCH Power Designer
  • Functional Safety-Capable
  • Integrated EMI mitigation
    • Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
    • Optimized for CISPR 32 Class B requirements
  • 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, 12-V, or adjustable output from 0.8 V to 36 V
    • 150°C maximum junction temperature
    • Lossless DCR or shunt current sensing
    • Shutdown mode current: 2.3 µA
    • No-load sleep current: 9.5 µA
    • Internal 3-ms soft-start ramp
    • Stackable up to two phases
    • Advanced dropout with frequency foldback
    • Internal bootstrap diode
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
    • Selectable PFM or FPWM modes
  • Inherent protection features for robust design
    • Internal hiccup mode overcurrent protection
    • ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Internal or external loop compensation
    • Thermal shutdown protection with hysteresis
  • Create a custom design using the LM25148 with WEBENCH Power Designer

The LM25148 is a 42-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25148 can be set up in interleaved mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM25148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.

The LM25148 is a 42-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25148 can be set up in interleaved mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM25148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.

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Technical documentation

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Type Title Date
* Data sheet LM25148 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum datasheet PDF | HTML 15 Dec 2021
Application note Designing an LED Driver for Medical Systems PDF | HTML 24 Feb 2025
Application note Power Supply Design for AMD Versal™ AI Edge Series PDF | HTML 29 Jan 2024
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
User guide LM25149-Q1 EVM User's Guide (Rev. A) PDF | HTML 29 Apr 2022
Functional safety information LM25148 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 07 Dec 2021
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021

Design & development

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

Evaluation board

LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V to 36-V, low IQ, synchronous buck DC/DC controller evaluation module

The LM25149-Q1EVM-2100 high-density evaluation module (EVM) is designed to showcase the performance of the LM25149-Q1 high-performance, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 5.5 V to 36 V to deliver a fixed 5-V output with better than 1% (...)
User guide: PDF | HTML
Not available on TI.com
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
Evaluation board

LM5149-Q1EVM-400 — LM5149-Q1 evaluation module, 72-V, low-IQ, synchronous buck DC/DC controller with active EMI filter

The LM5149-Q1EVM-400 high-density evaluation module (EVM) is designed to showcase the performance of the LM5149-Q1 high-performance, automotive, synchronous buck DC/DC buck controller. The EVM operates over a wide input voltage range of 15 V to 72 V to deliver a fixed 12-V output with better than (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LM25149-Q1 PSpice Transient Model

SNVMC96.ZIP (308 KB) - PSpice Model
Download
Calculation tool

LM5148-LM25148DESIGN-CALC — LM5148/-Q1 and LM25148/-Q1 controller quickstart design tool

Welcome to the quickstart design tool for the LM5148, LM5148-Q1, LM25148 and LM25148-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the above controller family. As such, the user can expeditiously arrive at an (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM5148 — 3.5-V to 80-V, current mode synchronous buck controller
  • LM5148-Q1 — Automotive, 80V synchronous buck DC/DC controller with ultra-low IQ
  • LM25148 — 42-V synchronous buck DC/DC controller with ultra-low IQ
  • LM25148-Q1 — Automotive 42-V synchronous buck DC/DC controller with ultra-low IQ
Hardware development
Evaluation board
  • LM5149-Q1EVM-400 — LM5149-Q1 evaluation module, 72-V, low-IQ, synchronous buck DC/DC controller with active EMI filter
  • LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V to 36-V, low IQ, synchronous buck DC/DC controller evaluation module
Download
PCB layout

LM25149-Q1EVM-2100 PCB Layout Files

SNVR501.ZIP (1990 KB)
Download
Reference designs

PMP31252 — 150W dual phase synchronous buck converter reference design for automotive applications

This design showcases a low EMI, dual-phase buck converter that can be used as a dual-output converter. As a dual-phase converter, the circuit can provide a continuous output current of 22A with 30A peak in a 12V to 5V configuration.
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RGY) 24 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • Ongoing reliability monitoring
Information included:
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