MIC5255-3.0BM5 查看數據表（PDF） - Micrel

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MIC5255-3.0BM5

150mA Low Noise µCap CMOS LDO

Micrel 

MIC5255

150mA Low Noise µCap CMOS LDO

General Description

Features

The MIC5255 is an efficient, precise CMOS voltage

regulator optimized for ultra-low-noise applications. It

offers 1% initial accuracy, extremely-low dropout voltage

(135mV at 150mA) and low ground current (typically

90µA). The MIC5255 provides a very-low-noise output,

ideal for RF applications where a clean voltage source is

required. A noise bypass pin is also available for further

reduction of output noise.

Designed specifically for handheld and battery-powered

devices, the MIC5255 provides a TTL-logic-compatible en-

able pin. When disabled, power consumption drops nearly

to zero.

The MIC5255 also works with low-ESR ceramic

capacitors, reducing the amount of board space necessary

for power applications, critical in handheld wireless

devices.

• Input voltage range: 2.7V to 6.0V

• Thin SOT package: 1mm height SOT-23-5

• Ultra-low output noise: 30µV(rms)

• Stability with ceramic output capacitors

• Ultra-low dropout: 135mV @ 150mA

• High output accuracy:

– 1.0% initial accuracy

– 2.0% over temperature

• Low quiescent current: 90µA

• Tight load and line regulation

• TTL-Logic-controlled enable input

• “Zero” off-mode current

• Thermal shutdown and current limit protection

Key features include current limit, thermal shutdown, faster

transient response, and an active clamp to speed up

device turn-off. Available in the 6-pin 2mm × 2mm MLF®

package, the IttyBitty® SOT-23-5 package and the new

Thin SOT-23-5, which offers the same footprint as the

standard IttyBitty® SOT-23-5, but only 1mm tall. The

MIC5255 offers a range of output voltages.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• Consumer/personal electronics

___________________________________________________________________________________________________________

Typical Application

CIN = 1.0µF VIN

Ceramic

Enable

Shutdown

EN

EN (pin 3) may be

connected directly

to IN (pin 1).

MIC5255-x.x_M5

1

5

2

3

4

VOUT

COUT = 1.0µF

Ceramic

CBYP = 0.01µF

Ultra-Low-Noise Regulator Application

IttyBitty is a registered trademark of Micrel, Inc

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

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

November 2006

1

M9999-110906

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