+

+

+

BST

RON

RTN

SW

VCC

FB

VIN

VOUT

L1

UVLO

LM25019

9V-48V

1

2

3

4

5

6

8

7

SD

LM25019

www.ti.com

SNVS952 – DECEMBER 2012

LM25019 48V, 100mA Constant On-Time Synchronous Buck Regulator

Check for Samples: LM25019

1

FEATURES

•

Frequency Adjustable to 1MHz

•

Adjustable Undervoltage Lockout

2

•

Wide 9V to 48V Input Range

•

Remote Shutdown

•

Integrated 48V, High and Low Side Switches

•

Thermal Shutdown

•

No Schottky Required

•

Constant On-Time Control

APPLICATIONS

•

No Loop Compensation Required

•

Industrial Equipments

•

Ultra-Fast Transient Response

•

Smart Power Meters

•

Nearly Constant Operating Frequency

•

Telecommunication Systems

•

Intelligent Peak Current Limit

•

Isolated Bias Supply

•

Adjustable Output Voltage from 1.225V

•

Precision 2% Feedback Reference

DESCRIPTION

The LM25019 is a 48V, 100mA 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 low 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 LM25019 is available in LLP-8 and PSOP-8 plastic packages.

Packages

•

LLP-8

•

PSOP-8

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.