DUAL CHANNEL1.5 MHZ, 600MA SYNCHRONOUS STEP-DOWN CONVERTER
FSP3112
FEATURES
High Efficiency : Up to 96%
1.5MHz Constant Frequency Operation
600mA Output Current at V
IN
=3.0V
Very Low Quiescent Current of 500µA
No Schottky Diode Required
Low R
DS(ON)
Internal Switches: 0.35Ω
0.6V reference allows low Output Voltage
Current Mode Operation for excellent line and
load transient Response
Short-Circuit &Thermal Fault Protection
<1µA
Shutdown Current
Power-on Reset Output
Externally Synchronized Oscillator
Small Thermally Enhanced MSOP10 and DFN10
Packages
GENERAL DESCRIPTION
The FSP3112 is a dual channel high efficiency
monolithic synchronous step down current mode
DC-DC converter operating at 1.5MHz constant
frequency. The device integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode for each of the channels. The
FSP3112 can operate from a 2.5V to 5.5V input voltage
and is ideal for powering portable equipment that runs
from a single cell lithium-Ion (Li+) battery. It can supply
600mA output current for each channel and can also
run at 100% duty cycle for low dropout operation,
extending battery life in portable system. For FSP3112,
Pulse Skipping Mode operation at light loads provides
very low output ripple voltage for noise sensitive
applications.
APPLICATIONS
Portable Media Players
Digital Still Cameras
Cellular Telephones
PDAs
Wireless and DSL modems
PIN CONFIGURATION
(Top View)
VFB1 1
RUN1 2
VIN 3
SW1 4
GND 5
11
EXPOSED PAD
10 VFB2
9 RUN2
8 POR
7 SW2
6
NC
VFB1 1
RUN1 2
VIN 3
SW1 4
GND 5
11
EXPOSED PAD
(Top View)
10 VFB2
9 RUN2
8 POR
7 SW2
6
NC
10-Lead (3mm ×3mm) Plastic DFN
Exposed Pad is PGND (Pin 11)
Must be connected to GND.
10-Lead Plastic MSOP
Exposed Pad is PGND (Pin 11)
Must be connected to GND.
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2007-7-11