LM25019

ACTIVE

7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator

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Product details

Parameters

Vin (Min) (V) 7.5 Vin (Max) (V) 48 Vout (Min) (V) 1.25 Vout (Max) (V) 40 Switching frequency (Max) (kHz) 1000 Soft start Adjustable Features Over Current Protection, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Topology Buck, Inverting Buck-Boost 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 100-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:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD™
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Description

The LM25019 is a 48-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25019 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 start-up 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 LM25019 is available in 8-pin WSON and 8-pin SO PowerPAD plastic packages.

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Download

Technical documentation

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
$49.00
Description
The LM25019MR-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: 100mA
  • Frequency 400kHz
EVALUATION BOARDS Download
document-generic User guide
$29.00
Description
The LM5019 evaluation board provides the designer with a fully functional buck regulator employing the constant on-time (COT) operating principle. The evaluation board provides a 10V output over an input range of 12.5V to 100V.
Features
  • Input Voltage Range: 12.5V to 100V
  • Output Voltage: 10V
  • Output Current 100 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
$29.00
Description
The LM5019ISOEVAL evaluation board facilitates evaluation of the LM5019 100V, 100mA Constant On-Time Synchronous Buck Regulator. An isolated bias supply is implemented in this evaluation board with the LM5019 the Constant On-Time regulator. The LM5019 regulator integrates both the high and low side (...)
Features
  • Input Voltage Range: 20V to 100V
  • Primary Output Voltage: 10V
  • Secondary (Isolated) Output Voltage: 9.5V
  • Maximum Load Current (Primary and Secondary): 100 mA
  • Maximum Power Output: 1W
  • Nominal Switching Frequency 750 kHz efficiency (FIN = 24V, IOUT2 = 100mA
  • 70% Board Size: 2 inch x 2 inch

Design tools & simulation

SIMULATION MODELS Download
SNVM211.ZIP (40 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAH1.TSC (148 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMAH2.ZIP (15 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVMAM3.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 (...)

Reference designs

REFERENCE DESIGNS Download
NAMUR PLC Digital input with fault protection and diagnostics reference design
TIDA-010044 — The NAMUR proximity sensor is widely used in industrial control when a special requirement on maximum energy is to be fulfilled by the sensor. This in turn dictates special requirements on the PLC digital input designed to interface with such sensor with regard to accuracy, and reliability. This (...)
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

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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