7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator


Product details


Vin (Max) (V) 100 Vin (Min) (V) 7.5 Iout (Max) (A) 0.6 Features Synchronous Rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type HSOP(8)/WSON(8) open-in-new Find other Isolated DC/DC converters & modules

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 WSON (NGU) 8 16 mm² 4 x 4 open-in-new Find other Isolated DC/DC converters & modules


  • Wide 7.5-V to 100-V input range
  • Integrated 100-V high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout (UVLO)
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • WSON-8
    • SO PowerPAD™-8
  • Create a custom regulator design using WEBENCH Power Designer
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The LM5017 is a 100-V, 600-mA synchronous stepdown regulator with integrated high side and low side MOSFETs. The constant on-time (COT) control scheme employed in the LM5017 requires no loop compensation, provides excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout (VCC UVLO).

The LM5017 device is available in WSON-8 and HSOP PowerPAD-8 plastic packages.

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Technical documentation

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Type Title Date
* Data sheet LM5017 100-V, 600-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator datasheet (Rev. K) Aug. 12, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 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
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered drones Nov. 21, 2017
Selection guide Control-Mode Quick Reference Guide (Rev. A) Sep. 14, 2017
Technical article Simplifying 100V wide VIN power conversion Nov. 11, 2016
Technical article Laying out an inverting buck-boost converter for success Sep. 28, 2016
Technical article Tripping Point: Simplifying circuit breaker design using delta-sigma ADCs Aug. 10, 2016
White paper Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
Application note Is Your IGBT Gate-Driver Power Supply Optimized Mar. 12, 2015
Application note Fly-Buck(TM) converter provides EMC and isolation in PLC applications Jan. 29, 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) Dec. 17, 2014
More literature Fly-Buck™ Solution Nov. 19, 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guide AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) Aug. 13, 2013
User guide AN-2200 LM5017 Evaluation Board (Rev. B) Apr. 30, 2013
Application note AN-2171 Designing Constant-On-Time Buck Regulators for Low Drop-Out Voltage (Rev. A) Apr. 23, 2013
More literature High-Voltage PoL Power Solutions Jan. 30, 2012
More literature LM5017 Quick Start Calculator Jan. 20, 2012

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 LM5017 evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 10V output over an input range of 12.5V to 100V.

document-generic User guide

An isolated bias supply is implemented in this evaluation board with LM5017 Constant-On-Time regulator. LM5017 regulator integrates both the high and low side power switches essential for creating isolated buck converter.

  • Input Range: 20V to 100V
  • Primary Output Voltage: 10V
  • Secondary (Isolated) Output Voltage: 9.5V
  • Maximum Load Current (Primary + Secondary): 300 mA
  • Maximum Power Output: 3W
  • Nominal Switching Frequency: 750 kHz
  • Efficiency (FIN = 48V, IOUT2 = 300 mA): 76 percent
  • Board size: 2 inch x 2 inch

Design tools & simulation

SNVM020B.ZIP (31 KB) - PSpice Model
SNVM041A.ZIP (15 KB) - TINA-TI Spice Model
SNVM042A.TSC (203 KB) - TINA-TI Reference Design
SNVMAM1A.ZIP (2 KB) - PSpice Model
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 (...)
LM5017 Quick Start Calculator
LM5017-QUICKSTART-CALC LM5017 Quick Start Circuit Component Calculators for Buck Regulator and Fly-Buck™ Converter

Reference designs

Many TI reference designs include the LM5017 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
WSON (NGU) 8 View options

Ordering & quality

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  • Ongoing reliability monitoring

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