MIC5246

Micrel

June 2000

1

MIC5246

General Description

The MIC5246 is an efficient, precise CMOS voltage regulator

optimized for low-noise applications. The MIC5246 offers

better than 1% initial accuracy, extremely-low-dropout volt-

age (typically 150mV at 150mA) and constant ground current

(typically 85

µA)over load . The MIC5246 features an error

flag that indicates an output fault condition such as overcurrent,

thermal shutdown and dropout. The MIC5246 provides a very

low noise output, ideal for RF applications where quiet

voltage sources are required.

Designed specifically for hand-held and battery-powered

devices, the MIC5246 provides a TTL-logic-compatible en-

able pin. When disabled, power consumption drops nearly to

zero.

The MIC5246 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, a push-

pull output for faster transient response, and an active clamp

to speed up device turnoff. Available in the IttyBitty™ SOT-23-5

package, the MIC5246 also offers a range of fixed output

voltages.

Typical Application

15

2

34

Enable

Shutdown

EN

MIC5246-x.xBM5

EN (pin 3) may be

connected directly

to IN (pin 1).

47k

Ω

FLG

Low-Noise Regulator Application

MIC5246

150mA

Preliminary Information

Features

• Error flag indicates fault condition

• Ultralow dropout—100mV @ 100mA

• Load independent, ultralow ground current: 85

µA

• 150mA output current

• Current limiting

• Thermal Shutdown

• Tight load and line regulation

•“Zero” off-mode current

• Stability with low-ESR capacitors

• Fast transient response

• TTL-Logic-controlled enable input

Applications

• Cellular phones and pagers

• Cellular accessories

• Battery-powered equipment

• Laptop, notebook, and palmtop computers

• PCMCIA V

• Consumer/personal electronics

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

• High-efficiency linear power supplies

Ordering Information

Part Number

Marking

Voltage

Junction Temp. Range

Package

MIC5246-2.6BM5

LT26

2.6V

–40

°C to +125°C

SOT-23-5

MIC5246-2.7BM5

LT27

2.7V

–40

°C to +125°C

SOT-23-5

MIC5246-2.8BM5

LT28

2.8V

–40

°C to +125°C

SOT-23-5

MIC5246-2.85BM5

LT2J

2.85V

–40

°C to +125°C

SOT-23-5

MIC5246-3.0BM5

LT30

3.0V

–40

°C to +125°C

SOT-23-5

MIC5246-3.3BM5

LT33

3.3V

–40

°C to +125°C

SOT-23-5

Other voltages available. Contact Micrel for details.

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

IttyBitty is a trademark of Micrel, Inc.