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AN734

更新时间： 2022-11-26 13:53:59

品牌	Logo	应用领域
威世 - VISHAY		稳压器
页数	文件大小	规格书
5页	50K
描述
Design Guidelines for the Low-Noise Low-Dropout Regulator Si9181

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AN734 数据手册

AN734

Vishay Siliconix

Design Guidelines for the Low-Noise

Low-Dropout Regulator—Si9181

Nitin Kalje

The Si9181 was designed for applications requiring a regu-

lated voltage equal to or less than the voltage of the source or

battery, and requiring very low output noise. Such applications

include digital signal processors, baseband circuits, mixers, A-

to-D converters, or intermediate amplifiers. The Si9181’s LDO

characteristics are determined by its voltage, ground current,

power-dissipation, peak current capability, noise and ripple re-

jection specifications. The Si9181 is designed to meet the cri-

teria for high quality on each of these determinants, and is

suitable for portable and noise–sensitive appliances such as

cellular phones.

INTRODUCTION

This application note discusses the operation and features of

the Si9181, a 350-mA CMOS low-dropout (LDO), low-noise

voltage regulator. Providing very low ground current to extend

battery life, the Si9181 also offers superior line/load transient

response and ripple rejection. Designed to maintain regulation

while delivering currents from 0 mA to 600 mA, the Si9181

regulator also features an “out of regulation” error flag signal

and ON/OFF control input for complete shutdown.

NOISE

ADJ

NOISE

S19181

2.2 mF

ADJ

–

OFF

To V

OUT

6 MW

60 mV

5% V

2.2 mA

2.2 mF

OUT

REF

–

EXT

DELAY

0.1 mF

ERROR

–

1.215 V

REF

GND

FIGURE 1. 350-mA CMOS LDO Regulator (Adjustable Output)

Document Number: 71337

31-Oct-00

www.vishay.com

12 3 4 5

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