SA57005 datasheet(2/12 Pages) PHILIPS

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Philips Semiconductors

Product data

SA57005

Multiple output low noise, low dropout linear regulator

2002 Jun 20

853-2352 28505

GENERAL DESCRIPTION

The SA57005 is a very low dropout, low noise composite voltage

regulator with three fixed independent outputs. The output voltages

are preset to 2.5 V, 2.8 V and 3.0 V having a common input voltage

pin VIN. Two ON/OFF switches allow Vo1 and Vo2/Vo3 to be turned

off when not needed, thus conserving power. Also, three regulators

in one package save board space, which is critical in

microprocessor systems.

Designed for battery-powered and portable applications the

SA57005 achieves unequalled performance in all specifications

such as low supply-current, low dropout voltage, low power

consumption, small size, fast dynamic response to line and load,

precision output and so on. Each of these regulators consists of an

internal voltage reference, an error amplifier, resistors, and control

switch. The SA57005 is housed in a VSOP-8A 8-lead package.

FEATURES

• Very low dropout voltage: V

o1:

0.25 V typ.; Vo2: 0.28 V typ.;

Vo3: 0.30 V typ.

• Low noise: 60 µV

rms typ. (f = 10 Hz to 10 kHz; IO = 30 mA)

• High precision output voltage: ±3%

• Output current capacity:

Io1 and Io2 = 100 mA max; Io3 = 150 mA max.

• Low consumption current: I

IN1 = 250 µA typ.,

IIN2/IIN3 = 500 µA typ. (when not loaded), 3 µA max. (when off)

• Line regulation: 1%/V typ. (I

OUT = 30 mA; VIN = 4.0 to 8.0 V)

• Load regulation: 30 mV typ. for I

OUT = 0 to 70 mA

• Low temperature drift co-efficient to V

OUT: ±100 ppm/°C

• Thermal shutdown

• Wide operating temperature range: –20 °C to +75 °C

APPLICATIONS

• Cellular phones, cordless phones and 2-way radios

• Electronic notebooks, PDAs and Palmtop computers

• Cameras, VCRs and camcorders

• Modems

• Battery-powered or hand-held instruments

SIMPLIFIED DEVICE DIAGRAM

≥1 µF

PS1

PS2/3

VIN

Ω

µF

GND

Vo1

Vo2

Vo3

SL01698

SA57005

Figure 1. Simplified device diagram.

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