MP2101

1.6MHz Synchronous Step-Down

plus 200mA LDO

MP2101 Rev. 1.0

www.MonolithicPower.com

1

8/18/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

The Future of Analog IC Technology

TM

TM

DESCRIPTION

The MP2101 is an internally compensated

1.6MHz

fixed-frequency

PWM

step-down

switcher with a 200mA low dropout (LDO) linear

regulator. It is ideal for portable equipment

powered by a single cell Lithium-Ion (Li+)

Battery. The MP2101 can provide 800mA and

200mA of load current from a 2.5V to 6V input

voltage. Both output voltages can be regulated

as low as 0.6V.

The 800mA output channel features an

integrated high-side switch and synchronous

rectifier for high efficiency without an external

Schottky diode. With peak current mode control

and internal compensation, the MP2101 can be

stabilized with ceramic capacitors and small

inductors. The high-side switch can maintain

100% duty cycle in dropout condition.

The 200mA LDO output is used to power noise

sensitive circuitry. It has a separate input supply

to reduce power dissipation and noise from the

main switcher. Dropout voltage is 280mV under

a 150mA load. Fault condition protection

includes cycle-by-cycle current limiting and

thermal shutdown.

The MP2101 is available in small 3mm x 3mm

10-pin QFN packages.

FEATURES

• 0.8A Switcher Output and 0.2A LDO Output

• Internal Power MOSFET Switches

• Stable with Low ESR Output Ceramic

Capacitors

• Up to 93% Efficiency

• 0.01µA Shutdown Current

• 1.6MHz Fixed Switching Frequency

• Up to 100% Switcher Duty Cycle

• Thermal Shutdown

• Cycle-by-Cycle Over Current Protection

• Short Circuit Protection

• Power On Reset Output

• Available in 3x3 10-Pin QFN Packages

APPLICATIONS

• DVD+/-RW Drives

• Smart Phones

• PDAs

• Digital Cameras

• Portable Instruments

“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

MP2101

FB1

EN1

IN1

SW1

IN2

5

9

8

7

10

1

2

3

4

6

FB2

EN2

PWROK

OUT2

GND

OUT2

1.2V @ 200mA

POWER OK

OUT1

1.8V @ 600mA

L1

OFF ON

2.5V - 6V

100

90

80

70

60

50

40

10

100

1000

LOAD CURRENT (mA)

Efficiency vs

Load Current