LM25116

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 1.215 Vout (Max) (V) 36 Iout (Max) (A) 20 Iq (Typ) (uA) 4600 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 open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck controllers (external switch)

Features

  • 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
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Description

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM25116 Wide-Range Synchronous Buck Controller datasheet (Rev. E) Sep. 23, 2016
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
Technical articles High cell battery packs fuel new applications and extend time between charges Sep. 03, 2015
Application note Automated Frequency Response Analyzer Oct. 09, 2013
User guide AN-1596 LM5116 Evaluation Board (Rev. C) Apr. 24, 2013
User guide AN-1617 LM25116 Evaluation Board (Rev. A) Apr. 24, 2013
User guide AN-1713 LM5116-12 Evaluation Board (Rev. A) Apr. 24, 2013
Application note Minimizing FET Losses For a High Input Rail Buck Converter (Rev. A) Apr. 23, 2013

Design & development

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Hardware development

EVALUATION BOARD Download
75
Description

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 (...)

Features
  • Emulated peak current mode
  • Wide operating range up to 42V
  • Low IQ Shutdown (<10µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5A peak gate drive
  • Free-run or synchronous operation to 1MHz
  • Optional diode emulation mode
  • Programmable output from 1.215V to 36V
  • Precision 1.5% voltage reference
  • Programmable (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM353.ZIP (222 KB) - PSpice Model
SIMULATION MODEL Download
SNVM354.ZIP (58 KB) - PSpice Model
SIMULATION MODEL Download
SNVM862.ZIP (3 KB) - PSpice Model
SIMULATION MODEL Download
SNVM863.ZIP (2 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOL Download
LM(2)5116/WG Quick Start Component Calculator
LM5116-5116WG-25116DESIGN-CALC

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

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