Product details

Vin (Max) (V) 100 Vin (Min) (V) 7.5 Iout (Max) (A) 0.3 Features Synchronous Rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type HSOP(8)/WSON(8)
Vin (Max) (V) 100 Vin (Min) (V) 7.5 Iout (Max) (A) 0.3 Features Synchronous Rectification Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Package type HSOP(8)/WSON(8)
HSOIC (DDA) 8 19 mm² 4.9 x 3.9 WSON (NGU) 8 16 mm² 4 x 4
  • Wide 7.5- to 100-V input range
  • Integrated 300-mA 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
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • WSON-8
    • SO PowerPAD™-8
  • Create a custom design using the LM5018 with the WEBENCH power designer
  • Wide 7.5- to 100-V input range
  • Integrated 300-mA 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
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • WSON-8
    • SO PowerPAD™-8
  • Create a custom design using the LM5018 with the WEBENCH power designer

The LM5018 is a 100-V, 300-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5018 device requires no loop compensation, provides excellent transient response, and enables very low 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.

The LM5018 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

The LM5018 is a 100-V, 300-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5018 device requires no loop compensation, provides excellent transient response, and enables very low 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.

The LM5018 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

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Technical documentation

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Type Title Date
* Data sheet LM5018 100-V, 300-mA Constant On-Time Synchronous Buck / Fly-Buck™ Regulator datasheet (Rev. I) 12 Aug 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 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 Stability Analysis and Design of COT Type-3 Ripple Circuit 20 Mar 2019
Application note Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 05 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Simplifying 100V wide VIN power conversion 11 Nov 2016
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
Application note Fly-Buck(TM) converter provides EMC and isolation in PLC applications 29 Jan 2015
Technical article Fly-Buck: Frequently Asked Questions (FAQs) 05 Jan 2015
Application note AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 17 Dec 2014
Technical article Powering Bipolar Rails with Wide-VIN Fly-Buck Converter 09 Dec 2014
More literature Fly-Buck™ Solution 19 Nov 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
User guide AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) 13 Aug 2013
User guide AN-2237 LM5018 Buck Evaluation Board (Rev. A) 30 Apr 2013
User guide AN-2239 LM5018 Isolated Evaluation Board (Rev. A) 30 Apr 2013
More literature High-Voltage PoL Power Solutions 30 Jan 2012

Design & development

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

Evaluation board

LM5018EVAL — LM5018 Wide Vin Synchronous Buck Regulator Evaluation Board

The LM5018 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.
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Limit: 5
Evaluation board

LM5018ISOEVAL — LM5018 Isolated Bias Supply Evaluation Board

An isolated bias supply is implemented in this evaluation board with the LM5018 Constant-On-Time (COT) regulator. The LM5018 regulator integrates both the high and low side power switches essential for creating an isolated buck converter.
In stock
Limit: 5
Daughter card

BOOSTXL-3PHGANINV — 48-V Three-Phase Inverter With Shunt-Based In-Line Motor Phase Current Sensing Evaluation Module

The BOOSTXL-3PHGANINV evaluation module features a 48-V/10-A three-phase GaN inverter with precision in-line shunt-based phase current sensing for accurate control of precision drives such as servo drives.

MathWorks MATLAB & Simulink example models include the following:

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Limit: 3
Simulation model

LM5018 PSpice Transient Model (Rev. A)

SNVM044A.ZIP (40 KB) - PSpice Model
Simulation model

LM5018 Unencrypted PSpice Transient Model (Rev. A)

SNVMAM2A.ZIP (2 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

LM5018QUICK-CALC — LM5018 Quick Start Calculator

LM5018 Quick Start Calculator is an easy to use excel based design tool for LM5018 based buck converter design. The design tool has all the design equations embedded and an example default design. The user can modify the design input parameters such as the input voltage range, output voltage, load (...)
Many TI reference designs include the LM5018

Use our reference design selection tool to review and identify designs that best match your application and parameters.

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

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