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LM25018

ACTIVE

7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator

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Data sheet

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LM5168 ACTIVE 6-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability FPWM and PFM mode option and low IQ.

LM25018

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.3 Vin (max) (V) 48 Vin (min) (V) 7.5 Vout (max) (V) 40 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.7 Features Synchronous rectification Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 90
Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.3 Vin (max) (V) 48 Vin (min) (V) 7.5 Vout (max) (V) 40 Vout (min) (V) 1.25 Switch current limit (typ) (A) 0.7 Features Synchronous rectification Control mode Constant on-time (COT) Operating temperature range (°C) -40 to 125 Duty cycle (max) (%) 90
WSON (NGU) 8 16 mm² (4 mm × 4 mm) HSOIC (DDA) 8 29.4 mm² (4.9 mm × 6 mm)
  • 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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Top documentation Type Title Format options Date
* Data sheet LM25018 48-V, 325-mA Constant On-Time Synchronous Buck/Fly-Buck™ Regulator datasheet (Rev. G) PDF | HTML May 24, 2021
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications (Rev. A) PDF | HTML Aug 20, 2024
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr 8, 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
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer PDF | HTML Oct 9, 2015
Analog design Journal 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
Product overview Fly-Buck™ Solution Nov 19, 2013
User guide LM25018 Isolated Buck (FlyBuck) User's Guide Jun 20, 2013
User guide LM25018 Buck Evaluation Board Apr 3, 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.
User guide: PDF
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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
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Simulation model

LM25018 PSpice Transient Model

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

LM25018 Unencrypted PSpice Model

SNVM833.ZIP (2 KB) - PSpice model
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Calculation tool

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

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.

Supported products & hardware
Reference design

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 (...)
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WSON (NGU) 8 Ultra Librarian
HSOIC (DDA) 8 Ultra Librarian
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