VIN

SW

BST

LM25010

VCC

SS

RON/SD

6V - 42V

Input

C1

R2

R1

C2

L1

C3

C4

D1

C6

RTN

ISEN

SGND

FB

SHUTDOWN

R3

LM25010

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SNVS419C – DECEMBER 2005 – REVISED DECEMBER 2008

LM25010/LM25010Q 42V, 1.0A Step-Down Switching Regulator

Check for Samples: LM25010

1

FEATURES

•

2.5V, ±2% Feedback Reference

•

Programmable Soft-Start

2

•

Wide 6V to 42V Input Voltage Range

•

Thermal shutdown

•

Valley Current Limiting At 1.25A

•

LM25010Q is AEC-Q100 Grade 1 & 0 qualified

•

Programmable Switching Frequency Up To 1

MHz

TYPICAL APPLICATIONS

•

Integrated N-Channel Buck Switch

•

Non-Isolated Telecommunications Regulator

•

Integrated High Voltage Bias Regulator

•

Secondary Side Post Regulator

•

No Loop Compensation Required

•

Automotive Electronics

•

Ultra-Fast Transient Response

•

Nearly Constant Operating Frequency With

Line and Load Variations

•

Adjustable Output Voltage

DESCRIPTION

The LM25010 features all the functions needed to implement a low cost, efficient, buck regulator capable of

supplying in excess of 1A load current. This high voltage regulator integrates an N-Channel Buck Switch, and is

available in thermally enhanced LLP-10 and TSSOP-14EP packages. The constant on-time regulation scheme

requires no loop compensation resulting in fast load transient response and simplified circuit implementation. The

operating frequency remains constant with line and load variations due to the inverse relationship between the

input voltage and the on-time. The valley current limit detection is set at 1.25A. Additional features include: VCC

under-voltage lock-out, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limiter.

Package

•

LLP-10 (4 mm x 4 mm)

•

TSSOP-14EP

•

Both Packages Have Exposed Thermal Pad For Improved Heat Dissipation

Basic Step-Down Regulator

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 © 2005–2008, 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.