MIC5254 데이터 시트보기 (PDF) - Micrel

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MIC5254

Dual 150mA µCap LDO with Error Flag Outputs

Micrel 

MIC5254

Dual 150mA µCap LDO

with Error Flag Outputs

General Description

The MIC5254 is an efficient, precise, dual CMOS voltage

regulator. It offers better than 1% initial accuracy,

extremely low dropout voltage (typically 135mV at 150mA)

and low ground current (typically 90µA) over load. The

MIC5254 features two independent LDOs with error flags

that indicate an output fault condition such as overcurrent,

thermal shut-down and dropout.

Designed specifically for handheld and battery-powered

devices, the MIC5254 provides a TTL-logic-compatible

enable pin. When disabled, power consumption drops

nearly to zero.

The MIC5254 also works with low-ESR ceramic

capacitors, reducing the amount of board space necessary

for power applications, critical in handheld wireless

devices.

Key features include current limit, thermal shutdown, faster

transient response, and an active clamp to speed up

device turnoff. The MIC5254 is available in the 10-pin

MSOP package and is rated over a –40°C to +125°C

junction temperature range.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Input voltage range: 2.7V to 6.0V

• Dual, independent 150mA LDOs

• Error flags indicate fault condition

• Stable with ceramic output capacitor

• Ultra-low dropout: 135mV @ 150mA

• High output accuracy: 1.0% initial accuracy 2.0% over

temperature

• Low quiescent current: 90µA each LDO

• Tight load and line regulation

• Thermal shutdown and current limit protection

• “Zero” off-mode current

• TTL logic-controlled enable input

• 10-pin MSOP package

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• Consumer/personal electronics

___________________________________________________________________________________________________________

Typical Application

VINA

1µF

VINB

1µF

MIC5254

9

10

VINA OUTA

2 ENA FLGA 1

3 GNDA OUTB 8

6 VINA FLGB 4

5 ENB GNDB 7

FLGA

FLGB

VOUTA

1µF

Ceramic

VOUTB

1µF

Ceramic

Dual Output LDO with Error Flag

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

December 2007

M9999-121107

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