MIC5270-3.0BM5 Micrel Semiconductor, MIC5270-3.0BM5 Datasheet

MIC5270-3.0BM5

Manufacturer Part Number

MIC5270-3.0BM5

Description

IttyBitty Negative Low-Dropout Regulator Preliminary Information

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC5270-3.0BM5.pdf (4 pages)

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General Description

The MIC5270 is a Cap 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 Cap regulator design is optimized to work with low-

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

quires only a 1 F capacitance for stability.

Designed for applications where small packaging and effi-

ciency are critical, the MIC5270 combines LDO design exper-

tise with IttyBitty

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,

and –5.0V outputs.

Typical Application

Pin Description

IttyBitty is a trademark of Micrel, Inc.

March 1999

MIC5270

Pin Number

–6.0V

™

packaging to improve performance and

1µF

MIC5270-5.0

GND

–IN

–OUT

Pin Name

10µF

–OUT

GND

–IN

–5.0V

OUT

Ordering Information

Part Number

MIC5270-3.0BM5

MIC5270-4.1BM5

MIC5270-5.0BM5

Pin Function

Not internally connected.

Ground

Not internally connected.

Negative Regulator Output

Negative Supply Input

283

Features

• IttyBitty

• Low dropout voltage

• Low ground current

• Tight initial accuracy

• Tight load and line regulation

• Thermal shutdown

• Current limiting

• Stable with low-ESR ceramic capacitors

Applications

• GaAsFET bias

• Portable cameras and video recorders

• PDAs

• Battery-powered equipment

Pin Configuration

IttyBitty™ Negative Low-Dropout Regulator

Voltage

–3.0V

–4.1V

–5.0V

™

SOT-23-5 packaging

Preliminary Information

Temperature Range

–40 C to +85 C

MIC5270-x.xBM5

–OUT

MIC5270

LLxx

GND

–IN

SOT-23-5

Package

MIC5270

Micrel

Related parts for MIC5270-3.0BM5

MIC5270-3.0BM5 Summary of contents

Page 1

... Current limiting • Stable with low-ESR ceramic capacitors Applications • GaAsFET bias • Portable cameras and video recorders • PDAs • Battery-powered equipment Ordering Information Part Number Voltage MIC5270-3.0BM5 –3.0V MIC5270-4.1BM5 –4.1V MIC5270-5.0BM5 –5.0V Pin Configuration V OUT 4 – ...

Page 2

... Note 9. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 100mA load pulse at V MIC5270 Operating Ratings (Note 1) Input Voltage (V ...

Page 3

... MIC5270 Functional Diagram March 1999 GND V IN MIC5270-x.x 285 V OUT MIC5270 Micrel ...

Page 4

... Y5V dielectric, the value must be much higher than a tanta- lum to ensure the same minimum capacitor value over temperature. No-Load Stability The MIC5270 does not require a load for stability. Thermal Considerations Absolute values will be used for thermal calculations to clarify what is meant by power dissipation and voltage drops across the part ...

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