February 2004

1

M9999-021904

MIC2288

Micrel

MIC2288

1A 1.2MHz PWM Boost Converter in

Thin SOT-23 and 2

×××××2 MLF™

General Description

The MIC2288 is a 1.2MHz PWM, DC/DC boost switching

regulator available in low-profile Thin SOT-23 and

2mm

× 2mm MLF™ package options. High power density is

achieved with the MIC2288’s internal 34V/1A switch, allow-

ing it to power large loads in a tiny footprint.

The MIC2288 implements a constant frequency, 1.2MHz

PWM, current mode control scheme with internal compensa-

tion that offers excellent transient response and output regu-

lation performance. The high frequency operation saves

board space by allowing small, low-profile, external compo-

nents. The fixed frequency PWM topology also reduces

spurious switching noise and ripple to the input power source.

The MIC2288 is available in a low-profile Thin SOT-23-5

package and a 2mm

× 2mm MLF™-8 leadless package. The

2mm

× 2mm MLF™-8 package option has an output over-

voltage protection feature.

The MIC2288 has a junction temperature range of –40

°C to

+125

°C.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Typical Application

2

L1

10

µH

R2

R1

3

1

4

5

MIC2288BD5

VIN

1-Cell

Li Ion

15V

EN

SW

FB

GND

C1

2.2

µF

C2

10

µF

2mm

××××× 2mm MLF™ Boost Regulator

Features

• 2.5V to 10V input voltage range

• Output voltage adjustable to 34V

• Over 1A switch current

• 1.2MHz PWM operation

• Stable with ceramic capacitors

• High-efficiency

• <1% line and load regulation

• Low input and output ripple

• <1

µA shutdown current

• UVLO

• Output overvoltage protection (MIC2288BML)

• Over temperature shutdown

• Thin SOT-23-5 package option

• 2mm

× 2mm leadless MLF™-8 package option

•–40

°C to +125°C junction temperature range

Applications

• Organic EL power supply

• TFT-LCD bias supply

• 12V supply for DSL applications

• Multi-output DC/DC converters

• Positive and negative output regulators

• SEPIC converters

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

MLF and

60

65

70

75

80

85

90

0

0.05

0.1

0.15

0.2

LOAD (A)

15V

OUT

Efficiency

V

V

V