LM25017

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

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Product details

Parameters

Vin (Min) (V) 7.5 Vin (Max) (V) 48 Switching frequency (Max) (kHz) 1000 Soft start Adjustable Features Synchronous Rectification Operating temperature range (C) -40 to 125 Iout (A) 0.6 Product type Converter (Integrated switch) Topology Buck, Flybuck 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-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

All trademarks are the property of their respective owners.

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Description

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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Type Title Date
* Datasheet LM25017 48-V, 650-mA Constant On-Time Synchronous Buck Regulator datasheet (Rev. E) Nov. 20, 2017
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 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 Sep. 13, 2017
Technical article Create a Fly-Buck™ converter in WEBENCH® Power Designer Oct. 09, 2015
Application note 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
Technical article Powering Bipolar Rails with Wide-VIN Fly-Buck Converter Dec. 09, 2014
Technical article LM5017 Based Inverting Buck-Boost Enables Negative Supply Dec. 01, 2013
More literature Fly-Buck™ Solution Nov. 19, 2013
User guide AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) Aug. 13, 2013
User guide LM25017 Isolated Buck (FlyBuck) User's Guide Jun. 20, 2013
User guide AN-2200 LM5017 Evaluation Board (Rev. B) Apr. 30, 2013
User guide LM25017 Buck Evaluation Board Apr. 04, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
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.
Features
  • Input Range: 12.5V to 48V
  • Output Voltage: 10V
  • Output Current: 650mA
  • Frequency 400kHz
EVALUATION BOARD Download
49
Description

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.

Features
  • Wide Input Voltage (15-48VDC)
  • Primary non-isolated 5V output plus Secondary isolated 4.5V output.
  • Nominal Switching Frequency 500KHz
  • Maximum Load (Primary + Secondary): 600mA or 3W.
  • Efficiency (Vin=24V, Iout2=300mA): 75%
EVALUATION BOARD Download
document-generic User guide
25
Description

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.

EVALUATION BOARD Download
document-generic User guide
25
Description

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.

Features
  • Input Range: 20V to 100V
  • Primary Output Voltage: 10V
  • Secondary (Isolated) Output Voltage: 9.5V
  • Maximum Load Current (Primary + Secondary): 300 mA
  • Maximum Power Output: 3W
  • Nominal Switching Frequency: 750 kHz
  • Efficiency (FIN = 48V, IOUT2 = 300 mA): 76 percent
  • Board size: 2 inch x 2 inch

Design tools & simulation

SIMULATION MODEL Download
SNVM209.ZIP (33 KB) - PSpice Model
SIMULATION MODEL Download
SNVMAM0.ZIP (2 KB) - PSpice Model
CALCULATION TOOL 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 (...)

Reference designs

REFERENCE DESIGNS Download
Compact low-loss isolated four-output flybuck reference design
PMP21557 — This four output flybuck reference design the LM25017 synchronous buck converter to provide four 3.3 V, 82.5 mW outputs. Each output has 1.25 kV isolation and is regulated to 1% accuracy. A low profile transformer and low BOM count create a compact solution size.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Compact, Single-Channel, Isolated SiC and IGBT Gate Driver Reference Design for UPS and Inverters
TIDA-01160 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Triple Output Isolated Fly-Buck Power Supply for Industrial Application Reference Design
PMP10516 PMP10516 is an Isolated Flybuck Converter using the LM25017 regulator IC. The design accepts an input voltage of 20.4Vin to 28.8Vin (40Vin Max. Peak) and provides three isolated outputs. The +5Vout rail is regulated for precision using the LP2951 linear regulator.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24Vin, Isolated 24V & 5Vout SIP DC/DC Module Reference Design
PMP4460 The PMP4460 is a 24Vin 24Vout 50mA, 5Vout 100mA reference design module which is implemented in an industry standard SIP pinout. It includes a constant on-time synchronous Flybuck controller LM25017. The solution has high efficiency, good line and load regulation with 1,500V DC isolation. The power (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Low-Power Isolated Supply, Input range: 36V to 75V, Output: 10V @ 120mA, LM5017
PMP7798 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24Vin, ±15Vout, 3W Isolated SIP DC/DC Module Reference Design
PMP4415 The PMP4415 is a 24Vin +15Vout 150mA, -15Vout 50mA, 3W reference design module which is implemented in an industry standard SIP pinout. It includes a constant on-time synchronous Flybuck controller LM25017. The solution has high efficiency, good line and load regulation with 1,500V DC isolation. The (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24Vin, ±15Vout, 2W Isolated SIP DC/DC Module Reference Design
PMP4414 The PMP4414 is a 24Vin +15Vout 83mA, -15Vout 50mA, 2W reference design module which is implemented in an industry standard SIP pinout. It includes a constant on-time synchronous Flybuck controller LM25017. The solution has high efficiency, good line and load regulation with 1,500V DC isolation. The (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Tiny Synchronous Buck Converter in TO-220 Size Reference Design
PMP8581 — This design is a tiny synchronous buck converter which can be used either for 3.3V or 5.0V output voltage and a maximum current of 600mA. It has the same size like a TO-220 package and can directly replace linear regulators like the well-known uA7805.

CAD/CAE symbols

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

Ordering & quality

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  • Ongoing reliability monitoring

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