MIC2295

High Power Density 1.2A

Boost Regulator

MLF and MicroLeadFrame is a trademark of Amkor Technology

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

April 2005

M9999-042605

(408) 955-1690

General Description

The MIC2295 is a 1.2Mhz, PWM dc/dc boost switching

regulator available in low profile Thin SOT23 and 2mm x

2mm MLF™ package options.

High power density is

achieved with the MIC2295’s internal 34V / 1.2A switch,

allowing it to power large loads in a tiny footprint.

The MIC2295 implements constant frequency 1.2MHz

PWM current mode control. The MIC2295 offers internal

compensation that offers excellent transient response and

output regulation performance.

The high frequency

operation saves board space by allowing small, low-profile

external components. The fixed frequency PWM scheme

also reduces spurious switching noise and ripple to the

input power source.

The MIC2295 is available in a low-profile Thin SOT23 5-

lead package and a 2mm x2mm 8-lead MLF™ leadless

package. The 2mm x 2mm MLF™ package option has an

output over-voltage protection feature.

The MIC2295 has an operating junction temperature range

of –40

°C to +125°C

Features

• 2.5V to 10V input voltage range

• Output voltage adjustable to 34V

• 1.2A switch current

• 1.2MHz PWM operation

• Stable with small size ceramic capacitors

• High efficiency

• Low input and output ripple

• <1µA shutdown current

• UVLO

• Output over-voltage protection (MIC2295BML)

• Over temperature shutdown

• Thin SOT23-5 package option

• 2mm x 2mm leadless 8-lead MLF™ package option

Applications

• Organic EL power supplies

• 3.3V to 5V/500mA conversion

• TFT-LCD bias supplies

• Flash LED drivers

• Positive and negative output regulators

• SEPIC converters

• Positive to negative Cuk converters

• 12V supply for DSL applications

• Multi-output dc/dc converters

10

µH

R2

4.53K

R1

49.9k

MIC2295BML

VIN

1-Cell

Li Ion

3V to 4.2V

15V/100mA

EN

FB

AGND

C1

2.2

µF

2.2

µF

PGND

SW

OVP

L1

10

µH

R2

3.3k

R1

10k

MIC2295 BD5

VIN

1-Cell

Li Ion

5V/500mA

EN

SW

FB

GND

C1

2.2

µF

10

µF