Datasheet > SC561

SC561

更新时间： 2024-11-07 04:05:23

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器
页数	文件大小	规格书
15页	277K
描述
Dual Output Low Noise LDO Linear Regulator

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SC561 数据手册

SC561

Dual Output Low Noise LDO

Linear Regulator

POWER MANAGEMENT

Features

Description

The SC561 is a dual output, ultra-low dropout linear

voltage regulator designed for use in battery powered

applications. The SC561 provides ﬁxed output voltages of

V_LDOA= 3.1V and V_LDOB= 2.85V, and up to 300mA of load

current per channel.

Input voltage range — 2.5V to 5.5V

Output voltage — V_LDOA= 3.1V; V_LDOB= 2.85V

Maximum output current — 300mA (each LDO)

Dropout at 200mA load — 200mV max.

Quiescent supply current — 40μA (both LDOs

enabled)

Shutdown current — 100nA (typ)

Output noise < 50μV_RMS

PSRR >65dB at 1kHz

Over-temperature protection

Short-circuit protection

Under-voltage lockout

Power good monitor for output A

MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package

In applications where maximum battery life is essential,

the SC561 can operate in an extremely low power state by

setting the dynamic bias control. At very light loads, the

LOAD pin can be pulled low so that the device consumes

only 40ꢀA of quiescent current.

The SC561 provides superior low-noise performance by

using an external bypass capacitor to ﬁlter the bandgap

reference. The device also has a PGOOD output to hold a

processor in reset when the voltage on OUTA is not in

regulation.

Applications

PDAs and cellular phones

GPS devices

Palmtop computers and handheld instruments

TFT/LCD applications

The device provides protection circuitry such as short-

circuit protection, under-voltage lockout, and thermal

protection to prevent device failures. Stability is main-

tained by using 1ꢀF capacitors on the output pins. The

MLPQ-UT8 package and small ceramic bypass capacitors

minimize the required PCB area.

Wireless handsets

Digital cordless phones and PCS phones

Personal communicators

Wireless LAN

Typical Application Circuit

SC561

PGOOD

OUTA

VIN

OUTA

OUTB

BYP

OUTB

LOAD

C_IN

C_OUTB

1μF

C_BYP

22nF

C_OUTA

1μF

GND

2.2μF

November 21, 2007

12 3 4 5 6 7...15

中文翻译

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