LM25010MHX Datasheet

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LM25010 42V, 1.0A Step-Down Switching Regulator

February 2006

LM25010

42V, 1.0A Step-Down Switching Regulator

General 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 inte-

grates an N-Channel Buck Switch, and is available in ther-

mally enhanced LLP-10 and TSSOP-14EP packages. The

constant on-time regulation scheme requires no loop com-

pensation resulting in fast load transient response and sim-

plified circuit implementation. The operating frequency re-

mains 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. Addi-

tional features include: VCC under-voltage lock-out, thermal

shutdown, gate drive under-voltage lock-out, and maximum

duty cycle limiter.

Features

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Wide 6V to 42V Input Voltage Range

Valley Current Limiting At 1.25A

Programmable Switching Frequency Up To 1 MHz

Integrated N-Channel Buck Switch

Integrated High Voltage Bias Regulator

No Loop Compensation Required

Ultra-Fast Transient Response

Nearly Constant Operating Frequency With Line and

Load Variations

Adjustable Output Voltage

2.5V,

卤

2% Feedback Reference

Programmable Soft-Start

Thermal shutdown

Typical Applications

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Non-Isolated Telecommunications Regulator

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Secondary Side Post Regulator

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Power SUpply for Automotive Electronics

Package

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LLP-10 (4 mm x 4 mm)

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TSSOP-14EP

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Both Packages Have Exposed Thermal Pad For

Improved Heat Dissipation

Basic Step-Down Regulator

20172743

漏 2006 National Semiconductor Corporation

DS201727

www.national.com

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