Product details

Vin (Max) (V) 48 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) 48 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-V to 48-V input range
  • Integrated 325-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
  • Create a custom design using the LM25018 with the WEBENCH Power Designer
  • Wide 7.5-V to 48-V input range
  • Integrated 325-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
  • Create a custom design using the LM25018 with the WEBENCH Power Designer

The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018 device 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.

The LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.

The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018 device 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.

The LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.

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Technical documentation

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Type Title Date
* Data sheet LM25018 48-V, 325-mA Constant On-Time Synchronous Buck/Fly-Buck™ Regulator datasheet (Rev. G) 24 May 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
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer 09 Oct 2015
Analog design journal Fly-Buck(TM) converter provides EMC and isolation in PLC applications 29 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
User guide LM25018 Isolated Buck (FlyBuck) User's Guide 20 Jun 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
User guide LM25018 Buck Evaluation Board 03 Apr 2013

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.
In stock
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
Simulation model

LM25018 PSpice Transient Model

SNVM210.ZIP (40 KB) - PSpice Model
Simulation model

LM25018 Unencrypted PSpice Model

SNVM833.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.
Reference designs

TIDA-01093 — Industrial Battery Management Module for 20S Applications Reference Design

High serial cell count battery (>15s) systems are becoming more and more common for industrial applications. These applications are cost sensitive and require a simple solution that includes monitoring, protection, and control or even SOC (State of Charge) information rather than only basic (...)
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 (...)
Reference designs

PMP4412 — 24Vin, +5Vout, 1W Isolated SIP DC/DC Module Reference Design

The PMP4412 is a 24Vin +5Vout, 1W reference design module which is implemented in an industry-standard SIP pinout. It includes a constant on-time synchronous Flybuck controller LM25018. The solution has high efficiency, good line and load regulation with 1,500V DC isolation. The power module was (...)
Reference designs

PMP4413 — 24Vin, ±15Vout, 1W Isolated SIP DC/DC Module Reference Design

The PMP4413 is a 24Vin ±15Vout, 1W reference design module which is implemented in an industry standard SIP pinout. It includes a constant on-time synchronous Flybuck controller LM25018. The solution has high efficiency, good line and load regulation with 1,500V DC isolation. The power (...)
Reference designs

PMP4401 — 12Vin, ±5Vout, 1W Isolated SIP DC/DC module - Reference Design

The PMP4401 is a 12Vin, ±5Vout, 1W reference design module which is implemented in an industry standard SIP pinout.  It includes a constant on-time synchronous Fly-Buck controller LM25018.  The solution has high efficiency and good line and load regulation with 1,500V DC (...)
Reference designs

PMP4394 — 24Vin, +/-5V, 1W Isolated SIP DC/DC module - Reference Design

PMP4394 is a 24Vin, +/-5V, 1W reference design which is implemented in the standard industrial SIP pinout.  It includes a constant on-time synchronous Fly-Buck controller LM25018.  The solution has high efficiency, good line, load regulation with 1500V DC isolation.  The power module (...)
Package Pins Download
SO PowerPAD (DDA) 8 View options
WSON (NGU) 8 View options

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