SC1458AEVB

更新时间： 2024-11-19 04:05:35

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器
页数	文件大小	规格书
13页	213K
描述
Dual Output Low Noise LDO Linear Regulator

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中文翻译

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数据手册

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SC1458AEVB 数据手册

SC1458

Dual Output Low Noise LDO

Linear Regulator

POWER MANAGEMENT

Features

Description

Input voltage range — 2.5 to 5.5V

Output voltages — 2.8V and 1.8V (SC1458A), 2.85V

and 2.85V (SC1458B)

Maximum output current — 300mA (each LDO)

Low 200mV maximum dropout at 200mA load

Quiescent current — 100μA (both LDOs enabled)

Shutdown current — 100nA

Output noise < 50μV_RMS(SC1458B)

PSRR > 65dB at 1kHz (SC1458B)

Space saving package — MLPD-W6, 3mm x 3mm

Over-temperature protection

The SC1458 is a family of dual output, ultra-low dropout

linear voltage regulators designed for use in battery

powered wireless applications. Both versions of the

SC1458 require an input voltage level between 2.5V and

5.5V. The SC1458A supplies 2.5V on OUTA and 1.8V on

OUTB, while SC1458B supplies 2.85V on both outputs.

(For other voltage options see the SC560).

TheSC1458AprovidesaPGOODoutputtoholdaprocessor

in reset when the voltage on OUTA is not in regulation.

The SC1458B provides superior low-noise performance by

using an external bypass capacitor to ﬁlter the bandgap

reference. Both versions have a single enable pin that

controls both LDO outputs. The startup sequence delays

the start of OUTB by 128ꢀs after OUTA is enabled.

Short-circuit protection

Under-voltage lockout

Reset monitor for output A (SC1458A)

Applications

Each version also provides protection circuitry such as

current limiting, under-voltage lockout, and thermal

protection to prevent device failures. Stability is

maintained by using 1ꢀF capacitors on the output pins.

The MLPD package and 0402 ceramic capacitors minimize

the required PCB area.

PDAs and cellular phones

GPS devices

Palmtop computers and handheld instruments

TFT/LCD applications

Wireless handsets

Digital cordless phones and PCS phones

Personal communicators

Two-way pagers

Wireless LAN

Typical Application Circuit

SC1458A

To μP

VIN

PGOOD

OUTA

2.5V, 300mA

From μP

OUTB

1.8V, 300mA

GND

OUTB

C_IN

C_OUTA

C_OUTB

1μF

2.2μF

1μF

September 12, 2007

12 3 4 5 6 7...13

中文翻译

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