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Isolated DC/DC converters & modules

LM5018

ACTIVE

7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator

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Data sheet

LM5018

ACTIVE
Data sheet Order now

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) PDF | HTML 12 Aug 2021
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
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
Analog Design Journal 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.
User guide: PDF
Not available on TI.com
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.
User guide: PDF
Not available on TI.com
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:

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

LM5018 PSpice Transient Model (Rev. A)

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

LM5018 Unencrypted PSpice Transient Model (Rev. A)

SNVMAM2A.ZIP (2 KB) - PSpice Model
Download
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.
Download
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 (...)
Download
Calculation tool

LM5018 Buck Regulator Quick Start Component Calculator

SNVC055.ZIP (228 KB)
Download
Reference designs

TIDM-02006 — Distributed multi-axis servo drive over fast serial interface (FSI) reference design

This reference design presents an example distributed or decentralized multi-axis servo drive over Fast Serial Interface (FSI) using C2000™ real-time controllers. Multi-axis servo drives are used in many applications such as factory automation and robots. The cost per axis, performance and (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00913 — 48V 3-Phase Inverter with Shunt-based In-line Motor Phase Current Sensing Reference Design

The TIDA-00913 reference design realizes a 48V/10A 3-phase GaN inverter with precision in-line shunt-based phase current sensing for accurate control of precision drives such as servo drives. One of the largest challenges with in-line shunt-based phase current sensing is the high common-mode (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDM-02007 — Dual-axis motor drive using fast current loop (FCL) and SFRA on a single MCU reference design

This reference design presents a dual-axis motor drive using fast current loop (FCL) and software frequency response analyzer (SFRA) technologies on a single C2000 controller. The FCL utilizes dual core (CPU, CLA) parallel processing techniques to achieve a substantial improvement in control (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP21943 — 48-V / 25-A negative-to-positive synchronous buck-boost reference design for power amplifiers

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +48 V at 25 A. The design uses two dual synchronous boost controllers for 4-phase operation (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21867 — 12-V / 100-A negative-to-positive synchronous buck-boost reference design for power amplifiers

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +12 V at 100 A. The design uses two dual synchronous boost controllers for 4-phase (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00210 — 75V/10A Protected Full-Bridge Power Stage Reference Design for Bipolar Stepper Drives

Stepper drives are used in many applications operating typically from 12VDC to 48VDC. TI offers a rich family of stepper motor driver solutions with industry standard step/direction and parallel control interfaces.

For applications which require higher torque and power, often voltages above 48VDC, (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00365 — 75V/10A Protected Full-Bridge Power Stage Reference Design for Brushed DC Drives

Low voltage brushed DC drives are used in many applications. TI offers a rich family of brushed DC motor driver solutions with flexible control interface options for one or more brushed DC motors up to 60V.  For applications which require higher torque and power, often voltages above 60VDC (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP20814 — 3.75W Single Output Industrial PoE Isolated Flybuck Reference Design

PMP20814 is an isolated Flybuck converter utilizing the LM5018 for industrial applications. This design has a minimum operating input voltage of 43V and a maximum input voltage of 53V. The design has a primary output of 7.35V and a secondary output capable of sourcing 0.25A continuous current at (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00909 — 48V/10A High Frequency PWM 3-Phase GaN Inverter Reference Design for High-Speed Drives

Low voltage, high-speed drives and/or low inductance brushless motors require higher inverter switching frequencies in the range of 40 kHz to 100 kHz to minimize losses and torque ripple in the motor. The TIDA-00909 reference design achieves that by using a 3-phase inverter with three 80V/10A (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP7798 — Low-Power Isolated Supply, Input range: 36V to 75V, Output: 10V @ 120mA, LM5017

Based on the Wide VIN COT Sync Buck regulator LM5017, this FlyBuck circuit provides excellent regulation for two isolated outputs and one non-isolated output. Compared with a conventional Flyback circuit, this design features a smaller board size and minimized BOM without the need for an (...)
Test report: PDF
Schematic: PDF
Package Pins Download
SO PowerPAD (DDA) 8 View options
WSON (NGU) 8 View options

Ordering & quality

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