MIC5252-4.75BM5TR Micrel Semiconductor, MIC5252-4.75BM5TR Datasheet

MIC5252-4.75BM5TR

Manufacturer Part Number

MIC5252-4.75BM5TR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC5252-2.5YM5TR.pdf (9 pages)

Specifications of MIC5252-4.75BM5TR

Date_code

05+

Packing_info

SOT-153

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MIC5252

General Description

The MIC5252 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 MIC5252

provides a very-low-noise output, ideal for RF applications

where a clean voltage source is required. The MIC5252 has

a high PSRR even at low supply voltages, critical for battery

operated electronics. A noise bypass pin is also available for

further reduction of output noise.

Designed speciﬁcally for handheld and battery-powered

devices, the MIC5252 provides a TTL-logic-compatible en-

able pin. When disabled, power consumption drops nearly

to zero.

The MIC5252 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

turn-off. The MIC5252 is available in the 6-pin 2mm × 2mm

MLF™ package and the IttyBitty® SOT-23-5 package in a

wide range of output voltages.

Typical Application

IttyBitty is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are trademarks of Amkor Technology.

February 2005

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

Shutdown

EN (pin 3) m ay be

connected directly

to IN (pin 1).

= 1.0µF

Ceramic

Enable

MIC5252-x.xBM5

OUT

Ceramic

BYP

OUT

= 0.01µF

= 1.0µF

SHUTDOWN

ENABLE

Features

• Input voltage range: 2.7V to 6.0V

• PSRR = 50dB @ V

• Ultra-low output noise: 30µV(rms)

• Stability with ceramic output capacitors

• Ultra-low dropout: 135mV @ 150mA

• High output accuracy:

• Low quiescent current: 90µA

• Tight load and line regulation

• TTL-Logic-controlled enable input

• “Zero” off-mode current

• Thermal shutdown and current limit protection

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• Consumer/personal electronics

150mA High PSRR, Low Noise µCap CMOS LDO

Ultra-Low-Noise Regulator Application

1.0% initial accuracy

2.0% over temperature

MIC5252-x.xBML

MIC5252

+ 0.3V

(optional)

BYP

M9999-020305

Micrel, Inc.

OUT

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