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LM25116

ACTIVE

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

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Data sheet

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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.

LM25116

ACTIVE
Data sheet Order now

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
  • Emulated Peak Current Mode
  • Wide Operating Range (Up to 42 V)
  • Low IQ 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
  • Emulated Peak Current Mode
  • Wide Operating Range (Up to 42 V)
  • Low IQ 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.

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.
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Technical documentation

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Type Title Date
* Data sheet LM25116 Wide-Range Synchronous Buck Controller datasheet (Rev. E) PDF | HTML 23 Sep 2016
More literature Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
More literature 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
Technical article High cell battery packs fuel new applications and extend time between charges 03 Sep 2015
More literature 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
More literature 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
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Simulation model

LM25116 PSpice Average Model

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

LM25116 PSpice Transient Model

SNVM353.ZIP (222 KB) - PSpice Model
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Simulation model

LM25116 Unencrypted PSpice Average Model

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

LM25116 Unencrypted PSpice Transient Model

SNVM862.ZIP (3 KB) - PSpice Model
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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 (...)
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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 (...)
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HTSSOP (PWP) 20 View options

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