MIC5319-1.3HYD5(2006) Просмотр технического описания (PDF) - Micrel

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MIC5319-1.3HYD5
(Rev.:2006)

500mA µCap Ultra-Low Dropout, High PSRR LDO Regulator

Micrel 

MIC5319

MIC5319

Micrel, Inc.

500mA µCap Ultra-Low Dropout, High PSRR LDO Regulator

General Description

The MIC5319 is a high-performance, 500mA LDO regula-

tor, offering extremely high PSRR and very low noise while

consuming low ground current.

Ideal for battery-operated applications, the MIC5319 features

1% accuracy, extremely low-dropout voltage (200mV @

500mA), and low ground current at light load (typically 90µA).

Equipped with a logic-compatible enable pin, the MIC5319

can be put into a zero-off-mode current state, drawing no

current when disabled.

The MIC5319 is a µCap design operating with very small

ceramic output capacitors for stability, thereby reducing

required board space and component cost.

The MIC5319 is available in fixed-output voltages and adjust-

able output voltages in the super-compact 2mm x 2mm MLF®

leadless package and thin SOT-23-5 package.

Additional voltage options are available. Contact Micrel

marketing.

All support documentation can be found on Micrel’s web site

at www.micrel.com.

Features

• Ultra-low dropout voltage 200mV @ 500mA

• Input voltage range: 2.5 to 5.5V

• Stable with ceramic output capacitor

• Low output noise — 40µVrms

• Low quiescent current of 90µA total

• High PSRR, up to 70dB @1kHz

• Fast turn-on-time — 40µs typical

• High output accuracy:

• ±1.0% initial accuracy

• ±2.0% over temperature

• Thermal shutdown protection

• Current-limit protection

• Logic-controlled Enable

• Tiny 2mm x 2mm MLF® package, 500mA continuous

• Thin SOT-23-5 package, 500mA peak

Applications

• Cellular phones

• PDAs

• Fiber optic modules

• Portable electronics

• Notebook PCs

• Audio Codec power supplies

Typical Application

VIN

1µF

MIC5319

VIN VOUT

EN BYP

GND

0.1µF

2.8V@500mA

VOUT

2.2µF

200

180

160

140

120

100

80

60

40

20

0

0

Dropout Voltage

Vout = 2.8V

Cout = 2.2µF

100 200 300 400 500

OUTPUT CURRENT (mA)

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

PSRR

100 (Bypass Pin Cap = 0.1µF)

90

80

50mA 100µA

70

60

50

40

500mA

30

20

10

0

10

Vout = 2.8V

Vin = Vout + 1V

Cout = 2.2µF

100 1k 10k 100k 1M

FREQUENCY (Hz)

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 2006

1

M9999-042406

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