LM3488MM datasheet(1/24 Pages) NSC

部件名	LM3488MM

功能描述	High Efficiency Low-Side N-Channel Controller for Switching Regulators

PDF	24 Pages

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM3488

High Efficiency Low-Side N-Channel Controller for

Switching Regulators

General Description

The LM3488 is a versatile Low-Side N-FET high perfor-

mance controller for switching regulators. It is suitable for

use in topologies requiring low side FET, such as boost,

flyback, SEPIC, etc. Moreover, the LM3488 can be operated

at extremely high switching frequency in order to reduce the

overall solution size. The switching frequency of LM3488 can

be adjusted to any value between 100kHz and 1MHz by

using a single external resistor or by synchronizing it to an

external clock. Current mode control provides superior band-

width and transient response, besides cycle-by-cycle current

limiting. Output current can be programmed with a single

external resistor.

The LM3488 has built in features such as thermal shutdown,

short-circuit protection and over voltage protection. Power

saving shutdown mode reduces the total supply current to

5µA and allows power supply sequencing. Internal soft-start

limits the inrush current at start-up.

Key Specifications

n

Wide supply voltage range of 2.97V to 40V

n

100kHz to 1MHz Adjustable and Synchronizable clock

frequency

n ±

1.5% (over temperature) internal reference

n

5µA shutdown current (over temperature)

Features

n

8-lead Mini-SO8 (MSOP-8) package

n

Internal push-pull driver with 1A peak current capability

n

Current limit and thermal shutdown

n

Frequency compensation optimized with a capacitor and

a resistor

n

Internal softstart

n

Current Mode Operation

n

Undervoltage Lockout with hysteresis

Applications

n

Distributed Power Systems

n

Notebook, PDA, Digital Camera, and other Portable

Applications

n

Offline Power Supplies

n

Set-Top Boxes

Typical Application Circuit

10138844

Typical SEPIC Converter

May 2003

DS101388

www.national.com

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制造商	部件名	数据表	功能描述
National Semiconductor ...	LM3488MM	1,001Kb / 24P	High Efficiency Low-Side N-Channel Controller for Switching Regulators
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