Microsemi

Analog Mixed Signal Group

NX4108

1

Rev. 1.7

12/30/09

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

TYPICAL APPLICATION

DESCRIPTION

The NX4108 is a current mode PWM buck switcher with

internal compensation, can provide up to 1A output cur-

rent with FET on board. It operates from 2.8V to 5.5V

and output as low as 0.6V which is ideal for the applica-

tion with single cell Li-Ion battery as well as other 3.3V

input bus supply applications. Switching frequency is

fixed 1MHz, small surface mount inductors and capaci-

tors are allowed to use, make it good for portable appli-

cations.

NX4108 is available in 5-pin SOT23 package.

n SOT23-5L package

n Internal Digital Soft Start

n Internally-compensated Current Mode Controller

n <1uA Shut-down Current

n Peak Current Limit with HICCUP Feature and Over

Temperature Protection

n Prebias Start-up Operation

n Enable Available

n Pb-free and RoHS Compliant

ORDERING INFORMATION

FEATURES

1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD

APPLICATIONS

n Li-Ion Battery Operated Portable System

n Cellular Phones

n Portable Applications

n USB Devices

PRODUCTION DATA SHEET

Device

Temperature

Package

Pb-Free

NX4108CZ1TR

SOT23-5L

Yes

Figure1 - Typical application of NX4108CZ1TR

Pb Free Product

22uF(X5R,6.3V)

2.2uH

VIN=5V

Vout=2.5V

VIN

SW

GND

FB

EN

5

1

4

3

2

(X5R,6.3V)

10uF

332k

105k