MIC2570 2BM Micrel Semiconductor, MIC2570 2BM Datasheet

MIC2570 2BM

Manufacturer Part Number

MIC2570 2BM

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2570_2BM.pdf (15 pages)

Specifications of MIC2570 2BM

Case

SOP8

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General Description

Micrel’s MIC2570 is a micropower boost switching regulator

that operates from two alkaline, two nickel-metal-hydride

cells, or one lithium cell.

The MIC2570 accepts a positive input voltage between 1.3V

and 15V. Its typical no-load supply current is 130µA.

The MIC2570 is available in selectable ﬁxed output or ad-

justable output versions. The MIC2570-1 can be conﬁgured

for 2.85V, 3.3V, or 5V by connecting one of three separate

feedback pins to the output. The MIC2570-2 can be conﬁg-

ured for an output voltage ranging between its input voltage

and 36V, using an external resistor network.

The MIC2570 has a ﬁxed switching frequency of 20kHz. An

external SYNC connection allows the switching frequency to

be synchronized to an external signal.

The MIC2570 requires only four components (diode, inductor,

input capacitor and output capacitor) to implement a boost

regulator. A complete regulator can be constructed in a 0.6

All versions are available in an 8-lead SOIC with an operating

range from –40°C to +85°.

Typical Applications

2.0V–3.1V

2 AA Cells

August 2007

MIC2570

area.

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

Two-Cell to 5V DC-to-DC Converter

100µF

10V

S Y N C

MIC2570-1

GND

47µH

2.85V

3.3V

S W

MBRA140

220µF

10V

5V/100mA

2.5V to 4.2V

1 Li Cell

Features

• Operates from a two-cell supply

• 130µA typical quiescent current

• Complete regulator ﬁts 0.6 in

• 2.85V/3.3V/5V selectable output voltage (MIC2570-1)

• Adjustable output up to 36V (MIC2570-2)

• 1A current limited pass element

• Frequency synchronization input

• 8-lead SOIC package

Applications

• LCD bias generator

• Glucose meters

• Single-cell lithium to 3.3V or 5V converters

• Two-cell alkaline to ±5V converters

• Two-cell alkaline to –5V converters

• Battery-powered, hand-held instruments

• Palmtop computers

• Remote controls

• Detectors

• Battery Backup Supplies

1.3V to 15V operation

Single-Cell Lithium to 3.3V/80mARegulator

100µF

10V

Two-Cell Switching Regulator

S Y N C

MIC2570

GND

50µH

3.3V

S W

area

100µF

10V

MBRA140

330µF

6.3V

Micrel, Inc.

3.3V/80mA

MIC2570

OU T

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