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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 65 Vout (Min) (V) 2 Vout (Max) (V) 60 Switching frequency (Max) (kHz) 1000 Soft start Adjustable Features Enable, Forced PWM, Light Load Efficiency, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Topology Buck, Inverting Buck-Boost open-in-new Find other Flybuck converters

Package | Pins | Size

WSON (DNT) 12 16 mm² 4 x 4 open-in-new Find other Flybuck converters

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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
* Datasheet LM5160, LM5160A Wide Input 65-V, 2-A Synchronous Buck / Fly-Buck™ DC/DC Converter datasheet (Rev. E) Oct. 12, 2018
White papers Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Application notes Stability Analysis and Design of COT Type-3 Ripple Circuit Mar. 20, 2019
Application notes Powering Drones With a Wide VIN DC-DC Converter (Rev. A) Feb. 05, 2019
Selection guides Current Sense Amplifiers (Rev. D) Apr. 04, 2018
Technical articles Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered drones Nov. 21, 2017
Application notes PSR Flyback DC/DC Converter Transformer Design for mHEV Applications Nov. 13, 2017
Technical articles Simplify your power storage design with these Fly-Buck™ power tips Sep. 13, 2017
Technical articles Where shrinking makes sense: improving isolated, split-rail power designs in industrial applications Aug. 22, 2016
Technical articles 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 papers Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
User guides LM5160 Buck EVM User's Guide (Rev. B) Apr. 13, 2015
Application notes Is Your IGBT Gate-Driver Power Supply Optimized Mar. 12, 2015
User guides LM5160 FlyBuck (Isolated Buck) User’s Guide (Rev. A) Feb. 06, 2015
Application notes Fly-Buck(TM) converter provides EMC and isolation in PLC applications Jan. 29, 2015
Application notes Design a Flybuck Solution with Optocoupler to Improve Regulation Performance Jan. 19, 2015
Application notes AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) Dec. 17, 2014
White papers 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

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

 

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 (...)

Features
  • 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
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

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 (...)

Features
  • 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

SIMULATION MODELS Download
SNVM692.ZIP (92 KB) - PSpice Model
SIMULATION MODELS Download
SNVM965.ZIP (3 KB) - PSpice Model
SIMULATION MODELS Download
SNVMB64.TSC (304 KB) - TINA-TI Reference Design
CALCULATION TOOLS Download
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
  • 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 (...)
CALCULATION TOOLS Download
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 (...)
Features
  • 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
CALCULATION TOOLS Download
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 (...)
Features
  • 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
GERBER FILES Download
SNVC228.ZIP (1800 KB)

Reference designs

REFERENCE DESIGNS Download
EMC-compliant 10/100-Mbps Ethernet PHY reference design with IEEE802.3at Type-1 (≤ 12.95 W) PoE-PD
TIDA-010046 — This reference design provides a cost-optimized solution for 10 to 100 Mbps using the low-power Ethernet physical layer (PHY) DP83825 supporting 150-m reach over CAT5e cable which is beyond the standard Ethernet distance limitation of 100 m (328 feet). This design also demonstrates power (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated power architecture reference design for communication and analog input/output modules
TIDA-00300 This reference design provides a simple means through which to isolate I2C or SPI type communication lines. This is often required in Grid Infrastructure applications such as, protertion relays and circuit breakers, where high voltages are involved. This reference design provides the complete (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Accuracy Analog Front End Using 16-Bit SAR ADC with ±10V Measurement Range Reference Design
TIDA-00834 — The TIDA-00834 reference design accurately measures voltage and current inputs using simultaneously sampled, 16-bit, ±10 V, bipolar input SAR ADC critical to identify power systems malfunction and power quality related failures accurately and quickly. This results in reduced power systems (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non-isolated power architecture with diagnostics reference design for protection relay modules
TIDA-010055 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Input Protection and Backup Supply Reference Design for 25W PLC Controller Unit
TIDA-03031 — This TI Design provides a solution for input power path protection and backup supply design in a typical PLC controller unit. It replaces traditionally used discrete-circuit implementations with fully integrated protection circuits.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
2.3 nV/√Hz, Differential, Time Gain Control (TGC) DAC Reference Design for Ultrasound
TIDA-01427 — The TIDA-01427 reference design provides a solution for differential signal chain used for generating a time-varying control voltage (VCNTL) to drive multiple AFE devices in a parallel configuration. TI's low-noise analog front ends (AFEs) for medical ultrasound have a time gain control (TGC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Resolution, Fast Startup Analog Front End for Air Circuit Breaker Reference Design
TIDA-00661 The TIDA-00661 reference design features signal processing front-end subsystem for electronic trip units (ETU) used in air circuit breakers (ACB) or molded case circuit breakers (MCCB). This subsystem consists of Delta-Sigma ADC with 24-Bit resolution and fast startup (< 3ms), ±2.5V (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20W Industrial Power Supply
PMP10559 PMP10559 is a non-sync isolated Flybuck-boost converter with a negative primary voltage. The power supply has a synchronous buck regulator, LM5160, and a versa pack transformer. The design accepts an input voltage of 18V to 30V, and outputs 30V, capable of providing 0.67A of current to the load (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Dual-Output Isolated Fly-Buck Reference Design With an Ultra-Small Coupled Inductor
PMP15005 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Small Footprint Isolated DC/DC Converter for Analog Input Module Reference Design
TIDA-00689 — Isolated power supply is important for analog components like analog to digital converters (ADC) and operational amplifiers (Op-Amp) in the field of factory automation and control. It prevents ground loops, reduces noise and is essential for protection from surge. This TI Design shows an extreme low (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
2W Industrial Isolated Flybuck-Boost Reference Design
PMP20210 — PMP20210 is an isolated Flybuck converter utilizing the LM5160 for industrial applications. This design has a minimum operating input voltage of 12V and a maximum input voltage of 56V. The design is capable of sourcing 0.6A continuous current at 3.3Vout. Switching frequency is set to 200kHz. A (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Dual Output Non-Isolated Flybuck Reference Design
PMP10733 — PMP10733 uses the LM5160 in a Fly-Buck-Boost topology with the primary set as to a negative voltage.  Setting the primary side to a negative voltage reduces the turn’s ratio of the transformer and yield better line and load regulation as a result.  The primary and secondary voltages (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated Octo-output Fly-Buck Bias for IGBT Driver - Reference Design
PMP10531 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated Tri-output Fly-Buck Power Supply for Industrial PLC Applications - Reference Design
PMP10532 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Dual Isolated Outputs Fly-Buck Power Module Reference Design for Single IGBT Driver Bias
PMP10654 The PMP10654 reference design is a dual isolated outputs Fly-Buck power module for single IGBT driver bias. The two voltage rails are suitable for providing the positive and negative bias to an IGBT gate driver in motor drives for EV/HEV and industrial applications.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design
TIDA-00486 The TIDA-00486 TI Design uses Texas Instruments 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. An ISO15 transceiver provides an isolated RS-485 interface with up to 2500 VRMS of isolation. The LM5160 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non-Isolated RS-485 to Wi-Fi Bridge with 24 VAC Power Reference Design
TIDA-00485 The TIDA-00485 TI Design uses Texas Instruments 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. An SN65HVD72 transceiver provides the RS-485 Interface with 12 kV of ESD protection, and additional protection is (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design
TIDA-00199 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated DC/DC Power Supply for PLC Analog Input and Output Module Reference Design
TIDA-00401 The TIDA-00401 TI Design is an isolated DC/DC turn-key solution.For a 10W isolated power supply with wide input voltage range, no opto-coupler feedback and low number of external components the Fly-Buck™ topology is superior to a flyback design. The single side populated PCB board provides a (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
2.5W Isolated Fly-Buck Power Module Reference Design
PMP10736 The PMP10736 reference design is a single isolated outputs Fly-Buck power module. The Fly-Buck design with the LM5160 regulator provides a simple and compact solution for isolated power supply.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated 5W Telecom Power Supply Realized in Fly-Buck Topology Reference Design
PMP10152 The PMP10152 reference design shows an isolated Telecom Power Supply. The Fly-Buck converter generates 12V and 400mA on the isolated secondary side from a 12V input.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Class 3 COT Buck Converter for PoE Application Reference Design
PMP9416 The PMP9416 reference design is a single output non-isolated buck power supply for PoE applications. It accepts a 48V nominal input and provides a 5V 1A output. The input can be varied from 33V to 57V. The design features the LM5160 synchronous buck converter with the benefit of diode emulated mode (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
4000Vac Isolated Fly-Buck Power Converter for Medical Applications Reference Design
PMP10563 The PMP10563 reference design is a single output isolated Fly-Buck power supply for Medical applications. It takes 12V nominal input and provides 5.6V 0.12A output. The minmum input voltage can go down to 6V. The design features the LM5160 synchronous buck converter configured as a Fly-Buck (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Quad Output Isolated Synchoronous Fly-Buckboost Converter Reference Design
PMP10545 PMP10545 is an Isolated Flyback Converter with the primary configured as a buck-boost inverter, using the LM5160 regulator IC. The design accepts an input voltage of 9Vin to 30Vin and provides four isolated outputs of +5.7Vout, each capable of supplying 350mA. The design uses an easily available (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15W Isolated Self-Driven Synchronous Inverting Fly-Buckboost Using LM5160 Regulator Reference Design
PMP10571 PMP10571 is a sync isolated Flybuck-boost converter with a negative primary voltage. The power supply has a synchronous buck regulator, LM5160, and a versa pack transformer. The synchronous rectifier on the secondary improves efficiency and regulation under heavy load. The design accepts an input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated Flybuck-boost bias solution for air-conditioner compressor
PMP10588 The PMP10588 reference design is an isolated FlyBuck-Boost power supply for air conditioner compressor bias applications. It takes 12V nominal input and provides isolated +15V bias voltage. The load current is 150mA. The isolated output is generated from one single transformer windings on the (...)
document-generic Schematic document-generic User guide

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