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MIC5250

Dual 150mA µCap CMOS LDO Regulator

Micrel 

MIC5250

Micrel

MIC5250

Dual 150mA µCap CMOS LDO Regulator

OBSOLETE

General Description

The MIC5250 is an efficient, precise dual CMOS voltage

regulator optimized for ultra-low-noise applications. The

MIC5250 offers better than 1% initial accuracy, extremely low

dropout voltage (typically 150mV at 150mA) and constant

ground current over load (typically 100µA). The MIC5250

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

where quiet voltage sources are required. A noise bypass pin

is also available for further reduction of output noise.

Designed specifically for hand-held and battery-powered

devices, the MIC5250 provides TTL logic compatible enable

pins. When disabled, power consumption drops nearly to

zero.

The MIC5250 also works with low-ESR ceramic capacitors,

reducing the amount of board space necessary for power

applications, critical in hand-held wireless devices.

Key features include current limit, thermal shutdown, push-

pull outputs for faster transient response, and active clamps

to speed up device turnoff. Available in the 10-lead MSOP

(micro-shrink-outline package), the MIC5250 also offers a

range of fixed output voltages.

Features

• Ultralow dropout—100mV @ 100mA

• Ultralow noise—30µV(rms)

• Stability with ceramic, tantalum, or aluminum electrolytic

capacitors

• Load independent, ultralow ground current

• 150mA output current

• Current limiting

• Thermal Shutdown

• Tight load and line regulation

• “Zero” off-mode current

• Fast transient response

• TTL-Logic-controlled enable input

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• PCMCIA VCC and VPP regulation/switching

• Consumer/personal electronics

• SMPS post-regulator/dc-to-dc modules

• High-efficiency linear power supplies

Typical Application

Ordering Information

Part Number

Voltage Junction Temp. Range

MIC5250-2.7BMM

2.7V

–40°C to +125°C

MIC5250-2.8BMM

2.8V

–40°C to +125°C

MIC5250-3.0BMM

3.0V

–40°C to +125°C

MIC5250-3.3BMM

3.3V

–40°C to +125°C

Other voltages available. Contact Micrel for details.

Package

10-lead MSOP

10-lead MSOP

10-lead MSOP

10-lead MSOP

VINA

ENABLE

SHUTDOWN

MIC5250-3.3BMM

OUTA 10

9 INA BYPA 1

2 ENA GNDA 3

3.3V

CBYPA

COUTA

(optional)

VINB

ENABLE

SHUTDOWN

7 INB

5 ENB

OUTB 8

BYPB 4

GNDB 6

ENA may be connected directly to INA.

ENB may be connected directly to INB.

GNDA and GND B may be connected to

isolated grounds or the same ground.

3.3V

CBYPB

COUTB

(optional)

Dual Ultra-Low-Noise Regulator Circuit

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

June 2003

1

MIC5250

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