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LM25116

ACTIVE

6-42V Wide Vin, Current Mode Synchronous Buck Controller

A newer version of this product is available

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Same functionality with different pin-out to the compared device
LM25149 ACTIVE 42-V synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter Active EMI filtering and DRSS reduces EMI by an average of 25 dBµV.

Product details

Vin (min) (V) 6 Vin (max) (V) 42 Vout (min) (V) 1.215 Vout (max) (V) 36 Iout (max) (A) 20 Iq (typ) (mA) 4.6 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode current mode Type Controller
Vin (min) (V) 6 Vin (max) (V) 42 Vout (min) (V) 1.215 Vout (max) (V) 36 Iout (max) (A) 20 Iq (typ) (mA) 4.6 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog Control mode current mode Type Controller
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • New, similar products available:
    • LM25141 45-V wide input range synchronous buck controller
    • LM5141 65-V wide input range synchronous buck controller
    • LM25148 42-V synchronous buck controller with ultra-low IQ and DRSS
    • LM25149 42-V Synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range (up to 42 V)
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 36 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • 20-pin HTSSOP exposed pad
  • Thermal shutdown
  • New, similar products available:
    • LM25141 45-V wide input range synchronous buck controller
    • LM5141 65-V wide input range synchronous buck controller
    • LM25148 42-V synchronous buck controller with ultra-low IQ and DRSS
    • LM25149 42-V Synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range (up to 42 V)
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 36 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • 20-pin HTSSOP exposed pad
  • Thermal shutdown

The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM25141, LM5141, LM25148, and LM25149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM25141, LM5141, LM25148, and LM25149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

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Similar products you might be interested in

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LM25145 ACTIVE 6V to 42V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range A next-generation solution that provides comparable functionality, smaller solution size and higher efficiency over a 6-V to 42-V operating voltage range.

Technical documentation

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Type Title Date
* Data sheet LM25116 Wide-Range Synchronous Buck Controller datasheet (Rev. F) PDF | HTML 03 Nov 2023
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03 Jul 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
Application note Automated Frequency Response Analyzer 09 Oct 2013
EVM User's guide AN-1596 LM5116 Evaluation Board (Rev. C) 24 Apr 2013
EVM User's guide AN-1617 LM25116 Evaluation Board (Rev. A) 24 Apr 2013
EVM User's guide AN-1713 LM5116-12 Evaluation Board (Rev. A) 24 Apr 2013
Application note Minimizing FET Losses For a High Input Rail Buck Converter (Rev. A) 23 Apr 2013

Design & development

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

Evaluation board

LM25116EVAL — Evaluation Board for LM25116 Wide Vin Synchronous Buck Controller

The LM25116 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM25116 controller IC. The evaluation board provides a 5V output with a 7A current capability. The wide input voltage ranges from 7V (...)

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

LM25116 PSpice Average Model

SNVM354.ZIP (58 KB) - PSpice Model
Simulation model

LM25116 Unencrypted PSpice Average Model

SNVM863.ZIP (2 KB) - PSpice Model
Simulation model

LM5116 PSpice Transient Model (Rev. C)

SNVM345C.ZIP (101 KB) - PSpice Model
Simulation model

LM5116 Unencrypted PSpice Transient Model (Rev. A)

SNVM958A.ZIP (6 KB) - PSpice Model
Calculation tool

LM5116-5116WG-25116DESIGN-CALC — LM(2)5116/WG Quick Start Component Calculator

Welcome to the LM5116, LM5116WG and LM25116 Quickstart Design Tool. This standalone tool assists the power supply engineer with the design of a DC/DC buck regulator based on a synchronous buck controller from this product family. As such, the user can expeditiously arrive at an optimized design to (...)
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 (...)
Package Pins Download
HTSSOP (PWP) 20 View options

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