MP28119 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – Ultra-small 1.7MHz, 600mA, Low-Voltage Synchronous Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28119 is a 1.7MHz constant frequency,
current mode, ultra-small PWM step-down
converter. The device integrates a main switch
and a synchronous rectifier for high efficiency
and eliminates the needs for an external
schottky diode. It is ideal for powering portable
equipment that runs from a single cell Lithium-
Ion (Li+) battery. The MP28119 can supply
600mA of load current from a 2.5V to 6V input
voltage.
The output voltages of the MP28119EG-1.0 and
MP28119EG-1.2 are fixed at 1.0V and 1.2V
respectively.
The MP28119 can also run at 100% duty cycle
for low dropout applications.
The MP28119 has an output discharge function
that controls the discharging of the output
capacitor.
The MP28119 is available in an ultra-small 2x2
QFN package.
TYPICAL APPLICATION
OFF ON
7
IN
1
SW
MP28119EG-1.0
4
EN
5
OUT
GND
6,8
MP28119
Ultra-small
1.7MHz, 600mA, Low-Voltage
Synchronous Step-Down Converter
FEATURES
 High Efficiency: Up to 89%
 1.7MHz Constant Switching Frequency
 600mA Available Load Current
 2.5V to 6V Input Voltage Range
 100% Duty Cycle in Dropout
 Current Mode Control
 Short Circuit Protection
 Thermal Fault Protection
 Output Discharge Function
 <0.1μA Shutdown Current
 1.0V and 1.2V Fixed Out-put Versions
 Ultra-Small 2x2 QFN Package
APPLICATIONS
 Cellular and Smart Phones
 Microprocessors and DSP Core Supplies
 PDAs
 MP3 Players
 Digital Still and Video Cameras
 Portable Instruments
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Monolithic Power Systems, Inc.
OUTPUT
Efficiency vs. Load Current
V_OUT=1V, L=2.2uH
100
90 Vin=3.3V
80
70
60
50
Vin=5V
40
30
20
10
0
10
100
1000
LOAD CURRENT(mA)
MP28119 Rev.0.91
www.MonolithicPower.com
1
11/23/2011
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