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
• V
IN1
Range for Switcher: 2.5V to 6V
• V
IN2
Range for LDO: 1.2V to V
IN1
• 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
V
IN
2.5V - 6V
100
90
80
70
60
50
40
EFFICIENCY (%)
10 100 1000
LOAD CURRENT (mA)
Efficiency vs
Load Current
V
IN
=3.3V
V
IN
=5.0V
V
IN
=4.2V
