May 2005

1

M9999-052705

MIC5270

Micrel, Inc.

MIC5270

General Description

The MIC5270 is a µCap 100mA negative regulator in a

SOT-23-5 package. With better than 2% initial accuracy, this

regulator provides a very accurate supply voltage for applica-

tions that require a negative rail. The MIC5270 sinks 100mA

of output current at very low dropout voltage (600mV maxi-

mum at 100mA of output current).

The µCap regulator design is optimized to work with low-

value, low-cost ceramic capacitors. The output typically re-

quires only a 1µF capacitance for stability.

Designed for applications where small packaging and effi-

ciency are critical, the MIC5270 combines LDO design exper-

reduce power dissipation. Ground current is optimized to help

improve battery life in portable applications.

The MIC5270 is available in the SOT-23-5 package for space

saving applications and it is available with fixed –3.0V, –4.1V,

–5.0V, and adjustable outputs.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

Features

•Stable with ceramic or tantalum capacitor

• Low dropout voltage: 500mV @ 100mA

• Low ground current: 35µA @ load = 100µA

•Tight initial accuracy: ±2%

•Tight load and line regulation

•Thermal shutdown

•Current limiting

Applications

•GaAsFET bias

•Portable cameras and video recorders

• PDAs

•Battery-powered equipment

IttyBitty is a registered trademark of Micrel, 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

Ordering Information

Part Number

Junction

Standard

Marking Code

PbFree

Marking Code

Voltage

Temp. Range

Package

MIC5270BM5

LLAA

MIC5270YM5

LLAA

Adj.

–40°C to +125°C

SOT-23-5

MIC5270-3.0BM5

LL30

MIC5270-3.0YM5

LL30

–3.0V

–40°C to +125°C

SOT-23-5

MIC5270-4.1BM5

LL41

MIC5270-4.1YM5

LL41

–4.1V

–40°C to +125°C

SOT-23-5

MIC5270-5.0BM5

LL50

MIC5270-5.0YM5

LL50

–5.0V

–40°C to +125°C

SOT-23-5

MIC5270-5.0BM5

GND

–OUT

–IN

1

µF

10

µF

–5.0V

–6.0V

2

54

Regulator With Fixed Output

MIC5270BM5

GND

–OUT

–IN

1µF

10µF

–5.0V

–6.0V

2

54

3

V

R1

R2

OUT

ADJ

Regulator With Adjustable Output