EUP2539
Pin Configurations
Package Type
Pin Configurations
TSOT23-5
Pin Description
PIN
SW
TSOT23-5
DESCRIPTION
Switch Pin.This is the drain of the internal power switch. Connect inductor/diode here.
Minimize trace area at this pin to reduce EMI.
1
2
3
GND
FB
Common Ground. Connect the pin to the ground plane.
Feedback Pin. Reference voltage is 0.3V. Connect cathode of lowest LED and resistor
here. Calculate resistor value according to the formula: RFB=0.3/ILED
Chip Enable Pin. Connect it to 1.4V or higher voltage to enable device, 0.3V or less
voltage to disable device.
EN
IN
4
5
Input Supply Voltage
DS2539 Ver1.1 Apr. 2009
2