MP2101 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – 1.6MHz Synchronous Step-Down plus 200mA LDO

TM
The Future of Analog IC Technology ^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.
MP2101
1.6MHz Synchronous Step-Down
plus 200mA LDO
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
OFF ON
VIN
2.5V - 6V
OUT1
1.8V @ 600mA
2
EN1
9
EN2
3
8
L1
IN1
4
PWROK
7
SW1 MP2101 OUT2
6
IN2
10
FB2
1
FB1
5
GND
POWER OK
OUT2
1.2V @ 200mA
Efficiency vs
Load Current
100
90 ^VIN^=3.3V
80
70
V_IN=4.2V
60
V_IN=5.0V
50
40
10
100
1000
LOAD CURRENT (mA)
MP2101 Rev. 1.0
www.MonolithicPower.com
1
8/18/2006
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© 2006 MPS. All Rights Reserved.