LM5018

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 7.5 Vin (Max) (V) 100 Switching frequency (Max) (kHz) 1000 Soft start Adjustable Features Synchronous Rectification Operating temperature range (C) -40 to 125 Topology Buck open-in-new Find other Flybuck converters

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 Flybuck converters

Features

  • 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

All trademarks are the property of their respective owners.

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Description

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM5018 100-V, 300-mA Constant On-Time Synchronous Buck Regulator datasheet (Rev. H) Nov. 30, 2017
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
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 Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Selection guides Current Sense Amplifiers (Rev. D) Apr. 04, 2018
Technical articles Simplifying 100V wide VIN power conversion Nov. 11, 2016
Technical articles Create a Fly-Buck™ converter in WEBENCH® Power Designer Oct. 09, 2015
White papers Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
Application notes Fly-Buck(TM) converter provides EMC and isolation in PLC applications Jan. 29, 2015
Technical articles Fly-Buck: Frequently Asked Questions (FAQs) Jan. 05, 2015
Application notes AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) Dec. 17, 2014
Technical articles Powering Bipolar Rails with Wide-VIN Fly-Buck Converter Dec. 09, 2014
More literature Fly-Buck™ Solution Nov. 19, 2013
White papers Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guides AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) Aug. 13, 2013
Application notes AN-2292 Designing an Isolated Buck (Fly-buck) Converter (Rev. B) May 06, 2013
User guides AN-2237 LM5018 Buck Evaluation Board (Rev. A) Apr. 30, 2013
User guides AN-2239 LM5018 Isolated Evaluation Board (Rev. A) Apr. 30, 2013
More literature High-Voltage PoL Power Solutions Jan. 30, 2012

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
Description
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.
Features
  • Wide Input Voltage Range 12-V to 60-V Three Phase GaN Inverter with 7-ARMS Output Current per Phase
  • High Accuracy Phase Current Sensing Over Temperature Range From –25°C to 85°C
  • Precision In-Line Phase Current Sensing
  • TI BoosterPack Compatible Interface

Get started

  • See the Get Started sections of (...)
EVALUATION BOARDS Download
document-generic User guide
29
Description
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.
Features
  • Input Voltage Range: 12V to 100V
  • Output Voltage: 10V
  • Output Current 300 mA
  • Nominal Switching Frequency ~ 440 kHz
  • Measured Efficiency: 88.4% at 300 mA and VIN = 24V
  • Board Size 5.5 cm x 4.5 cm
EVALUATION BOARDS Download
document-generic User guide
29
Description
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.
Features
  • Input Voltage Range: 20V to 100V
  • Primary Output Voltage: 10V
  • Secondary (Isolated) Output Voltage: 9.5V
  • Maximum Load Current: 300 mA
  • Maximum Power Output: 1W
  • Nominal Switching Frequency 750 kHz (FIN = 24V, IOUT2 = 100 mA)
  • 70% Board Size 2 inch x 2 inch

Design tools & simulation

SIMULATION MODELS Download
SNVM044A.ZIP (40 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAM2A.ZIP (2 KB) - PSpice Model
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
LM5018 Quick Start Calculator
LM5018QUICK-CALC 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 (...)
CALCULATION TOOLS Download
SNVC055.ZIP (228 KB)

Reference designs

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.

CAD/CAE symbols

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

Ordering & quality

Support & training

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