3W HIGH POWER WHITE LED DRIVER
FSP3604
FEATURES
LED Power Efficiency: up to 90%
1MHz Switching Frequency
Uses small, Low Profile External Components
Low Start-Up Voltage: 0.9V(I
LED
=270mA)
Low R
DS(ON)
: 100mΩ (TYP.)
Open LED Protection
Over Temperature Protection
Low Profile SOT23-6L Package
GENERAL DESCRIPTION
The FSP3604 is a step up DC-DC converter that
delivers a regulated output current. The device
switches at a 1.0MHz constant frequency, allowing for
the use of small value external inductor and ceramic
capacitors.
The FSP3604 is targeted to be used for driving loads
up to 1A from a two-cell alkaline battery. The LED
current can be programmed by the external current
sense resistor, Rs, connected between the feedback
pin (FB) and ground. A low 95mV feedback voltage
reduces the power loss in the Rs for better efficiency.
With its internal 2A, 100mΩ NMOS switch, the device
can provide high efficiency even at heavy load. During
the shutdown mode, the feedback resistor Rs and the
load are completely disconnected and the current
consumption is reduced to less than 1uA.
APPLICATIONS
White LED Torch (Flashlight)
White LED Camera Flash
DSC (Digital Still Camera)Flash
Cellular Camera Phone Flash
PDA Camera Flash
Camcorder Torch (Flashlight) Lamp
PIN CONFIGURATION
(Top View)
VIN
VOUT SHDN
6
5
4
1
SW
2
GND
3
FB
Pin Number
1
2
3
4
5
6
Pin Name
SW
GND
FB
SHDN
VOUT
VIN
Pin Function
Power Switch Pin.
Ground Pin
Feedback Pin
Chip Shutdown Signal Input
Power Output Pin.
Power Supply Input.
TYPICAL APPLICATION CIRCUIT
1/6
2007-7-13
FOSLINK [ FOSLINK SEMICONDUCTOR CO.,LTD ]
