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LM5160

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LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter

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Data sheet

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LM5012 ACTIVE 6-V to 100-V input, 2.5-A non-synchronous buck DC/DC converter with ultra-low IQ Higher input voltage rating, easy to use SO-8 package and low IQ.

LM5160

ACTIVE
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Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Iout (max) (A) 2 Vin (min) (V) 4.5 Vin (max) (V) 65 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Control mode Constant on-time (COT) Vout (min) (V) 2 Vout (max) (V) 60 Duty cycle (max) (%) 92 Switch current limit (typ) (A) 2.5
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Iout (max) (A) 2 Vin (min) (V) 4.5 Vin (max) (V) 65 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1000 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Control mode Constant on-time (COT) Vout (min) (V) 2 Vout (max) (V) 60 Duty cycle (max) (%) 92 Switch current limit (typ) (A) 2.5
WSON (DNT) 12 16 mm² 4 x 4
  • 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
  • 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

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.

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) PDF | HTML 12 Oct 2018
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications (Rev. A) PDF | HTML 20 Aug 2024
Application brief Faster Switching of Large Inductive Loads in Digital Output Modules PDF | HTML 15 Jul 2022
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Application note Stability Analysis and Design of COT Type-3 Ripple Circuit 20 Mar 2019
Application brief Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 05 Feb 2019
Technical article Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered d PDF | HTML 21 Nov 2017
Application brief PSR Flyback DC/DC Converter Transformer Design for mHEV Applications 13 Nov 2017
Technical article Simplify your power storage design with these Fly-Buck™ power tips PDF | HTML 13 Sep 2017
Technical article Where shrinking makes sense: improving isolated, split-rail power designs in indus PDF | HTML 22 Aug 2016
Technical article Power Tips: Self-drive your synchronous rectifier PDF | HTML 09 Mar 2016
More literature Powering IGBT Drivers with Fly-Buck™ 03 Dec 2015
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer PDF | HTML 09 Oct 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters 29 Sep 2015
Technical article What is behind isolated DC/DC converter voltage regulation? PDF | HTML 31 Aug 2015
Technical article Lower EMI and quiet switching with the Fly-Buck™ topology PDF | HTML 17 Aug 2015
EVM User's guide LM5160 Buck EVM User's Guide (Rev. B) 13 Apr 2015
Application note Is Your IGBT Gate-Driver Power Supply Optimized 12 Mar 2015
User guide LM5160 FlyBuck (Isolated Buck) User’s Guide (Rev. A) 06 Feb 2015
Analog Design Journal Fly-Buck(TM) converter provides EMC and isolation in PLC applications 29 Jan 2015
Application note Design a Flybuck Solution with Optocoupler to Improve Regulation Performance 19 Jan 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 17 Dec 2014
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013

Design & development

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

Evaluation board

LM5160DNTBKEVM — LM5160DNTBKEVM Wide Input 65V, 1.5A Synchronous Step-Down DC-DC Converter

 

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 (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM5160DNTFBKEVM — LM5160DNTFBKEVM Fly-Buck Isolated Bias Supply Evaluation Board

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 (...)

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

LM5160 PSpice Transient Model

SNVM692.ZIP (92 KB) - PSpice Model
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Simulation model

LM5160 TINA-TI Flybuck Reference Design

SNVMB64.TSC (304 KB) - TINA-TI Reference Design
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Simulation model

LM5160 Unencrypted PSpice Transient Model

SNVM965.ZIP (3 KB) - PSpice Model
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Calculation tool

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

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.

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM3017 — High Efficiency Low-Side Controller with True Shutdown LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3481 — 2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback LM3481-Q1 — 2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current LM3524D — 40V, 0.2A 350KHz PWM controller LM3578A — 2-V to 40-VIN switching regulators in buck, boost, terminal, depending upon the application LM5020 — 13-100V Wide Vin, Current Mode PWM Boost, Flyback, Sepic Controller LM5022 — 6-60V Wide Vin, current mode boost, SEPIC and Flyback controller TL1451 — Dual Pulse-Width-Modulation Control Circuit TL1451A — 3.6V to 50V dual channel controller with Wide input voltage range TL1451A-EP — Enhanced Product Dual Pulse-Width-Modulation Control Circuits TL1451A-Q1 — 3.6-V to 50-V dual-channel PWM controller, AEC-Q100 qualified TL5001 — PWM Controller with wide input range, with ±5% tolerance on reference, operation –20°C to 85°C TL5001A — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C TL5001A-Q1 — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C TL5001M — PWM Controller with wide input range, with ±5% tolerance on reference, operation –55°C to 125°C TPS40210-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 700-mV reference voltage TPS40211-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 260-mV reference voltage TPS43000 — Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller TPS55010 — 2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS UC2572 — Negative output Flyback pulse width modulator
AC/DC & DC/DC converters (integrated FET)
LM25017 — 7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator LM25018 — 7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator LM25019 — 7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator LM2577 — 3.5-V to 40-V, 3-A low component count step-up regulator LM2585 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator LM2586 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator with frequency synchronization LM2587 — 4V to 40V, 5A Step-Up Wide Vin Flyback Regulator LM2588 — 4-V to 40-V, 5-A step-up wide VIN flyback regulator with frequency synchronization LM2621 — 1.2V to 14V input voltage, 1A load current, step-up DC-DC LM2623 — 0.8V to 14V input voltage, 2A load current, step-up DC-DC LM2623-Q1 — 0.8-V to 14-V input voltage, 2-A load current, step-up DC/DC, AEC-Q100 qualified LM2735 — 520kHz/1.6MHz space efficient boost and SEPIC DC-DC regulator LM2735-Q1 — 520-kHz, 1.6-MHz space efficient boost and SEPIC DC/DC regulator, AEC-Q100 qualified LM34925 — 7.5-100V Wide Vin, 100mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM34926 — 7.5-100V Wide Vin, 300mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM34927 — 7.5-100V Wide Vin, 600mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters LM5000 — 3.1-40V Wide Vin, 2A Current Mode Non-Synchronous Boost Regulator LM5001 — 3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator LM5001-Q1 — 3.1-V to 75-V wide VIN, 1-A current mode non-synchronous switch mode regulator LM5002 — 3.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic Converter LM5015 — 4.25-75V, Monolithic Two-Switch Forward DC-DC Regulator LM5017 — 7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator LM5018 — 7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator LM5019 — 7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator LM5160 — LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter LM5160-Q1 — Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5160A — LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5161 — Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter LM78S40 — 1.5A Adjustable Step Up, Step Down or Inverting Regulator TPS55340 — 5-A, 40-V, wide VIN boost, flyback, & SEPIC converter TPS55340-EP — Enhanced integrated, 5-A, 40-V wide input range boost/SEPIC/flyback DC/DC regulator TPS55340-Q1 — Integrated, 5-A 40-V wide input range boost/SEPIC/flyback DC/DC regulator, AEC-Q100 qualified TPS61175 — 3-A ,40V High Voltage Boost Converter with Soft-start and Programmable Switching Frequency TPS61175-Q1 — 3-A, 40-V high voltage boost converter with soft-start and programmable switching frequency
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Calculation tool

LM5160DNTBK-CALC — LM5160 Buck Regulator Quick Start Calculator

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 (...)

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5160 — LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter LM5160-Q1 — Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5160A — LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter
Download
Calculation tool

LM5160DNTFBK-CALC — LM5160 Fly-Buck Regulator Quick Start Calculator

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 (...)

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5160 — LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter LM5160-Q1 — Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter LM5160A — LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter
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Gerber file

FLYBUCK FLYBACK Design Calculator

SNVC228.ZIP (1800 KB)
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