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LM25017

ACTIVE

7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator

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Data sheet

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LM5169 ACTIVE 6V to 120V Wide VIN, 650-mA DC/DC converter with Fly-Buck™ capability FPWM and PFM mode option and low IQ.

LM25017

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck, Flybuck Iout (max) (A) 0.6 Vin (max) (V) 48 Vin (min) (V) 7.5 Vout (max) (V) 40 Vout (min) (V) 1.25 Switch current limit (typ) (A) 1.3 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) 0.6 Vin (max) (V) 48 Vin (min) (V) 7.5 Vout (max) (V) 40 Vout (min) (V) 1.25 Switch current limit (typ) (A) 1.3 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 650-mA high-side and low-side switches
  • No schottky diode 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 (UVLO)
  • Remote shutdown
  • Thermal shutdown
  • Create a custom design using the LM25017 with the WEBENCH power designer
  • Wide 7.5-V to 48-V input range
  • Integrated 650-mA high-side and low-side switches
  • No schottky diode 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 (UVLO)
  • Remote shutdown
  • Thermal shutdown
  • Create a custom design using the LM25017 with the WEBENCH power designer

The LM25017 device is a 48-V, 650-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25017 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 (VCC UVLO).

The LM25017 device is available in WSON-8 and HSOP-8 plastic packages.

The LM25017 device is a 48-V, 650-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25017 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 (VCC UVLO).

The LM25017 device is available in WSON-8 and HSOP-8 plastic packages.
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Technical documentation

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* Data sheet LM25017 48-V, 650-mA Constant On-Time Synchronous Buck/Fly-Buck™ Regulator datasheet (Rev. F) PDF | HTML Nov 16, 2012
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 Simplify your power storage design with these Fly-Buck™ power tips PDF | HTML Sep 13, 2017
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 LM25017 Isolated Buck (FlyBuck) User's Guide Jun 20, 2013

Design & development

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

Evaluation board

LM25017MR-EVM — LM25017 Wide Vin Synchronous Step-down Regulator Evaluation Module

The LM25017MR-EVM 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 48V.
User guide: PDF
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Evaluation board

LM25017MRFBEVM — Evaluation Module - LM25017MR Wide Vin 3W Dual Output Flybuck Regulator

An isolated bias supply is implemented in this evaluation board with an LM25017 Constant-On-Time regulator.  The LM25017 regulator integrates both the high and low side power switches essential for creating an isolated buck converter.

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Evaluation board

LM5017EVAL — LM5017 Wide Vin Synchronous Buck Regulator Evaluation Board

The LM5017 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

LM5017ISOEVAL — LM5017 Isolated Bias Supply Evaluation Board

An isolated bias supply is implemented in this evaluation board with LM5017 Constant-On-Time regulator. LM5017 regulator integrates both the high and low side power switches essential for creating isolated buck converter.

User guide: PDF
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Simulation model

LM25017 PSpice Transient Model

SNVM209.ZIP (33 KB) - PSpice model
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Simulation model

LM25017 Unencrypted PSpice Transient Model

SNVMAM0.ZIP (2 KB) - PSpice model
Supported products & hardware
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-01160 — Compact, Single-Channel, Isolated SiC and IGBT Gate Driver Reference Design for UPS and Inverters

This Silicon Carbide (SiC) FET and IGBT gate driver reference design is a blueprint to drive the power stages of UPS, AC inverter, and electric vehicle charge pile (EV charging station) applications. The design is based on TI’s UCC53xx 3-kVRMS basic isolated gate drivers to drive high- and (...)
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Package Pins CAD symbols, footprints & 3D models
WSON (NGU) 8 Ultra Librarian
HSOIC (DDA) 8 Ultra Librarian
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