lm2500506 National Semiconductor Corporation, lm2500506 Datasheet

lm2500506

Manufacturer Part Number

lm2500506

Description

2.5a Step-down Switching Regulator

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM2500506.pdf (22 pages)

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LM25005

42V, 2.5A Step-Down Switching Regulator

General Description

The LM25005 switching regulator features all of the functions

necessary to implement an efficient, high voltage buck regu-

lator using a minimum of external components. This easy to

use regulator includes a 42V, 160mΩ, N-channel MOSFET,

with an output current capability of 2.5 Amps. The regulator

control method is based upon current mode control utilizing

an emulated current ramp. Current mode control provides in-

herent line voltage feed-forward, cycle-by-cycle current limit-

ing and ease of loop compensation. The use of an emulated

control ramp reduces noise sensitivity of the pulse-width mod-

ulation circuit, allowing reliable control of very small duty

cycles necessary in high input voltage applications. The op-

erating frequency is programmable from 50kHz to 500kHz.

An oscillator synchronization pin allows multiple LM25005

regulators to self-synchronize or to be synchronized to an ex-

ternal clock. Additional protection features include: current

limit, thermal shutdown and remote shutdown capability. The

device is available in a power enhanced TSSOP-20 package

featuring an exposed die attach pad to aid thermal dissipation.

Simplified Application Schematic

201700

Features

■

Package

■

Integrated 42V, 160mΩ N-channel MOSFET

Ultra-wide input voltage range from 7V to 42V

Internal bias regulator

Adjustable output voltage from 1.225V

1.5% feedback reference accuracy

Current mode control with emulated inductor current ramp

Single resistor oscillator frequency setting

Oscillator synchronization input

Programmable soft-start

Shutdown / Standby input

Wide bandwidth error amplifier

Thermal Shutdown

TSSOP-20EP (Exposed Pad)

20170001

www.national.com

March 2006

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