Product details

Vin (Max) (V) 65 Vin (Min) (V) 4.5 Iout (Max) (A) 2 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type WSON(12)
Vin (Max) (V) 65 Vin (Min) (V) 4.5 Iout (Max) (A) 2 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type WSON(12)
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
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 26 Jul 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Application note 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 drones 21 Nov 2017
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer 09 Oct 2015
White paper Designing isolated rails on the fly with Fly-Buck™ converters 29 Sep 2015
Technical article How to design for EMC and isolation with Fly-Buck™ converters 28 Jul 2015
EVM User's guide LM5160 Buck EVM User's Guide (Rev. B) 13 Apr 2015
Technical article Simplifying higher current split-rail designs with Fly-Buck converters 05 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

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
Simulation model

LM5160 Unencrypted PSpice Transient Model

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

FLYBUCK-FLYBACK-DESIGN-CALC — Fly-Buck and Flyback Topology Selector

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.
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 (...)
Calculation tool

LM5160DNTFBK-CALC — LM5160 Fly-Buck 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 (...)
Gerber file

FLYBUCK FLYBACK Design Calculator

SNVC228.ZIP (1800 KB)
Reference designs

PMP10532 — Isolated Tri-output Fly-Buck Power Supply for Industrial PLC Applications - Reference Design

The PMP10532 reference design is an isolated Fly-Buck power supply for industrial applications. It takes 24V nominal input and provides three isolated outputs: +5V@1A and +/-15V@200mA. The design is suitable for providing isolated power supply to MCU and control circuits and positive/negative bias (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00440 — Leakage Current Measurement Reference Design for Determining Insulation Resistance

This reference design measures insulation resistance up to 100 MΩ. It has an on-board isolated 500-Vdc power supply and an isolated signal conditioning circuit to measure the leakage current. This design is useful to find leakage due to insulation breakdown in transformer and motor windings.
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010055 — Non-isolated power architecture with diagnostics reference design for protection relay modules

This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP15005 — Dual-Output Isolated Fly-Buck Reference Design With an Ultra-Small Coupled Inductor

PMP15005 uses the LM5160 in a Fly-Buck™ topology with the primary and secondary output both set to 5V nominal. The circuit accommodates a voltage input range from 14V to 36V, ideal for the 24-V nominal input rail. While the primary side is set at 5.4V nominally using the feedback resistors, (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10531 — Isolated Octo-output Fly-Buck Bias for IGBT Driver - Reference Design

The PMP10531 reference design is an 8-output isolated Fly-Buck power supply for IGBT gate driver in motor drive or high voltage inverter applications. It takes 24V nominal input and provides 4 isolated sets of (+15V, -8V) bias voltage. The board is designed to provide driver bias power for 6 IGBTs (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00486 — Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design

TIDA-00486 uses our SimpleLink Wi-Fi® CC3200 Internet-on-a-chip wireless MCU module to create a data bridge between an RS-485 network and a Wi-Fi network. The ISO15 transceiver provides an isolated RS-485 interface with up to 2500 VRMS of isolation. The LM5160 Fly-Buck™ power supply (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00485 — Non-Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design

TIDA-00485 uses our SimpleLink Wi-Fi CC3200 Internet-on-a-chip wireless MCU module to create a data bridge between an RS-485 network and a Wi-Fi® network. The SN65HVD72 transceiver provides the RS-485 interface with 12 kV of ESD protection and additional protection is provided on board. (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00199 — Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design

This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. Utilizing a Fly-Buck™ control topology, this reference design uses a single transformer for generating power (...)
User guide: PDF
Schematic: PDF
Reference designs

PMP9415 — Isolated Fly-Buck Power Module for PoE Application

The PMP9415 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed only Power part which can provide 33V-57V input votlage and 12V 1A output power. The design features the LM5160 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10572 — Class 3 Isolated Fly-Buck Power Module for PoE Application Reference Design

The PMP10572 reference design is an single output isolated Fly-Buck power supply for PoE application. It takes 48V nominal input and provides 12V 1A output. The board is designed with TPS2378(PD controller) to provide 40V-57V input votlage and 12V 1SA output power. The design features the LM5160A (...)
Test report: PDF
Schematic: PDF
Package Pins Download
WSON (DNT) 12 View options

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