ISL97634 Intersil Corporation, ISL97634 Datasheet - Page 3

• Manufacturer Part Number: ISL97634
• Description: White LED Driver
• Manufacturer: Intersil Corporation

Block Diagram
Pin Description
VIN (2.4V to 5.5V)
NUMBER
PIN
1
2
3
4
5
6
7
8
CIN
1.4MHZ OSCILLATOR AND RAMP
GM AMP
GM AMP
COMPENSATION
COMPENSATION
PWM/EN
COMPARATOR
NAME
FBSW
VOUT
GND
PIN
VIN
NC
FB
LX
PWM
GENERATOR
3
VIN
Ground Pin. Connect to local ground.
Input Supply Pin. Connect to the input supply voltage, the inductor and the input supply decoupling capacitor.
PWM or Enable Pin. Connect external PWM signal allows pulse width modulation current operation. Enable
signal allows peak current operation or disable signal shuts down the device.
No Connect
Feedback Pin. Connect the sense resistor between FB and ground. The cathode of bottom LED can also
be connected at this pin if the output current is not to be PWMed.
FB Disconnect Switch. Connect to the cathode of the bottom LED if the output current to be PWMed.
Output Pin. Connect to the anode of the top LED and the output filter capacitor.
Switching Pin. Connect to inductor.
AMPLIFIER
GM
CONTROLLER
PWM LOGIC
PWM/EN
ISL97634
95mV
CURRENT
SENSE
ISL97634
DRIVER
FET
L
DESCRIPTION
PWM/EN
REFERENCE
LX
GENERATOR
BANDGAP
FBSW
VOUT
GND
FB
RSET
2 LEDs to 6 LEDS
April 10, 2007
COUT
FN6264.2