Product details


Vin (Max) (V) 65 Vin (Min) (V) 4.5 Iout (Max) (A) 2 Features Enable, Light Load Efficiency, Pre-Bias Start-Up, Synchronous Rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type WSON(12) open-in-new Find other Isolated DC/DC converters & modules

Package | Pins | Size

WSON (DNT) 12 16 mm² 4 x 4 open-in-new Find other Isolated DC/DC converters & modules


  • Wide 4.5-V to 65-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No External Schottky Diode Required
  • 2-A Maximum Load Current
  • Adaptive Constant On-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable Forced PWM or DCM Operation
    • FPWM Supports Multi-Output Fly-Buck™
  • Nearly Constant Switching Frequency
    • Resistor Adjustable up to 1 MHz
  • Programmable Soft-Start Time
  • Prebiased Start-Up
  • ±1% Feedback Voltage Reference
  • LM5160A Allows External VCC Bias
  • Inherent Protection Features for Robust Design
    • Peak Current Limiting Protection
    • Adjustable Input UVLO and Hysteresis
    • VCC and Gate Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • Create a Custom Design Using the LM5160A With the WEBENCH® Power Designer
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The LM5160/A is a 65-V, 2-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The adaptive constant on-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The on-time varies inversely with input voltage resulting in nearly constant switching frequency.

Peak and valley current limit circuits protect against overload conditions. The undervoltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The LM5160/A is programmed through the FPWM pin to operate in continuous conduction mode (CCM) from no load to full load or to automatically switch to discontinuous conduction mode (DCM) at light load for higher efficiency. Forced CCM operation supports multiple-output and isolated Fly-Buck applications using a coupled inductor.

The LM5160A shares the same features and pin configuration as the LM5160. An external bias supply can be connected to the VCC pin of the LM5160A in Buck and Fly-Buck applications. This additional capability lowers IC power dissipation and improves efficiency at high input voltages.

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Technical documentation

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Type Title Date
* Data sheet LM5160, LM5160A Wide Input 65-V, 2-A Synchronous Buck / Fly-Buck™ DC/DC Converter datasheet (Rev. E) Oct. 12, 2018
Selection guide Current Sense Amplifiers (Rev. E) Sep. 20, 2021
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Application note Stability Analysis and Design of COT Type-3 Ripple Circuit Mar. 20, 2019
Application note Powering Drones With a Wide VIN DC-DC Converter (Rev. A) Feb. 05, 2019
Technical article Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered drones Nov. 21, 2017
Application note PSR Flyback DC/DC Converter Transformer Design for mHEV Applications Nov. 13, 2017
Technical article Simplify your power storage design with these Fly-Buck™ power tips Sep. 13, 2017
Technical article Where shrinking makes sense: improving isolated, split-rail power designs in industrial applications Aug. 22, 2016
Technical article Tripping Point: Simplifying circuit breaker design using delta-sigma ADCs Aug. 10, 2016
More literature Powering IGBT Drivers with Fly-Buck™ Dec. 03, 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
User guide LM5160 Buck EVM User's Guide (Rev. B) Apr. 13, 2015
Application note Is Your IGBT Gate-Driver Power Supply Optimized Mar. 12, 2015
User guide LM5160 FlyBuck (Isolated Buck) User’s Guide (Rev. A) Feb. 06, 2015
Application note Fly-Buck(TM) converter provides EMC and isolation in PLC applications Jan. 29, 2015
Application note Design a Flybuck Solution with Optocoupler to Improve Regulation Performance Jan. 19, 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) Dec. 17, 2014
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013

Design & development

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

Hardware development

document-generic User guide


The LM5160DNTBKEVM evaluation board provides a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output over an input range of 10V to 60V. The circuit delivers load currents to 1.5A. The application schematic is setup up to (...)

  • 10V to 60V input voltage range
  • 5V target output voltage
  • Delivers up to 1.5A output load current
  • FET place holder for EN/UVLO shutdown feature
  • PWM mode pin feature to choose between CCM and DCM
document-generic User guide

The LM5160DNTFBK evaluation module is designed to operate from a 24V nominal bus with an input voltage range of 18V to 32V.  It is capable of supplying 12V/400 mA to the load at the isolated output.  The nominal switching frequency is 300kHz.  The high side and low side MOSFETs are integrated in the (...)

  • 18V to 32V input voltage range
  • 8V target primary output voltage and 12V secondary isolated output
  • Can deliver up to 400mA output secondary load with primary unloaded
  • FPWM pin connected directly to Vcc

Design tools & simulation

SNVM692.ZIP (92 KB) - PSpice Model
SNVM965.ZIP (3 KB) - PSpice Model
SNVMB64.TSC (304 KB) - TINA-TI Reference Design
Fly-Buck and Flyback Topology Selector
FLYBUCK-FLYBACK-DESIGN-CALC This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
  • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
  • Capability to design up to 6 isolated outputs
  • Recommends ICs for desired application design
  • Incorporates loop compensation in designs
  • Compares efficiency, external component count and transformer currents for every topology (...)
LM5160 Buck Regulator Quick Start Calculator
LM5160DNTBK-CALC Welcome to the LM5160 Buck Regulator Quick Start Design Tool. This stand-alone tool facilitates and assists the power supply engineer with design of a DC/DC buck regulator based on the LM5160 65V, 1.5A COT Buck Regulator. As such, the user can expeditiously arrive at an optimized design to meet the (...)
  • Determine output filter inductance and input and output filter capacitances
  • Select components for soft-start, EN/UVLO resistors
  • Optimize and choose the ripple injection circuit required for your application
  • Determine the minimum input voltage available for a fixed output and switching frequency
LM5160 Fly-Buck Quick Start Calculator
LM5160DNTFBK-CALC Welcome to the LM5160 Fly-Buck Regulator Quick Start Design Tool. This stand-alone tool facilitates and assists the power supply engineer with design of a DC/DC Fly-Buck regulator based on the LM5160 65V, 1.5A COT Fly-Buck Regulator. As such, the user can expeditiously arrive at an optimized design (...)
  • Determine the maximum power handling capability of the part specific to the application
  • Determine the appropriate transformer turns ratio, input and output filter capacitances
  • Select components for soft-start, EN/UVLO resistors
SNVC228.ZIP (1800 KB)

Reference designs

Many TI reference designs include the LM5160 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

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Ordering & quality

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