MIC2800

Digital Power Management IC

2MHz, 600mA DC/DC w/Dual

LOWQ is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

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

September 2007

M9999-090507-C

General Description

The MIC2800 is a high performance power management

IC, giving three output voltages with maximum efficiency.

Integrating a 2MHz DC/DC converter with an LDO post

regulator, the MIC2800 gives two high efficiency outputs

with a second, 300mA LDO for maximum flexibility. The

MIC2800 features a LOWQ

current draw while in this mode to less than 30µA. In

LOWQ

use a PFM light load mode that can interfere with sensitive

RF circuitry.

The DC to DC converter uses small values of L and C to

reduce board space but still retains efficiencies over 90%

at load currents up to 600mA.

The MIC2800 is a µCap design, operating with very small

ceramic output capacitors and inductors for stability,

reducing required board space and component cost and it

is available in fixed output voltages in the 16-pin

3mm x 3mm MLF

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• 2.7V to 5.5V input voltage range

• 2MHz DC/DC converter and two stand-alone LDOs

–

LDO1: Low input voltage is powered directly from

DC/DC converter for highest efficiency

• Integrated power-on reset (OR function for all outputs)

–

Adjustable delay time

–

DC to DC Converter

• Output current to 600mA in PWM mode

–

• 2MHz PWM operation in normal mode

• >90% efficiency

LDOs

• LDO1 input voltage directly connected to DC/DC

converter output voltage for maximum efficiency

–

Ideal for 1.8V to 1.5V conversion

–

300mA output current from 1.8V input

–

Output voltage down to 0.8V

• LDO2 – 300mA output current capable

• Thermal Shutdown Protection

• Current Limit Protection

Applications

• Mobile phones

• PDAs

• GPS receivers

• Digital still cameras

• Portable media players

Typical Application

LDO

VIN

VIN

SW

FB

LDO1

LDO2

POR

LOWQ

EN2

EN1

MIC2800-xxxYML

Baseband

Memory/DSP

PGND

SGND

2.7V to 5.5V

4.7µF/

6.3V

0.01µF

2.2µF

ceramic

2.2µF

ceramic

0.01µF

0.1µF

2.2µF

ceramic

2.2µH

GND

GND

100 200 300 400 500 600

OUTPUT CURRENT (mA)

50

55

60

65

70

75

80

85

90

95

100

0

3V

3.6V

4.2V

L = 2.2µH