ST1208
! Pin Description
Name
Function
GND
Ground
Supply voltage input pin (2.7 ~ 5.0 V). Bypass IN to GND with a ceramic
capacitor.
IN
Charge pump output pin. Bypass to GND with a ceramic capacitor. Connect to
the anodes of all the LEDs. OUT is high impedance during shutdown.
Variable output current pin by changing the resistant value. Connect a resistor
from SET to GND to set the LED bias current. ISET = 0.6V / RSET
OUT
SET
EN1
EN2
Enable, Dimming Control Input. EN1 and EN2 control shutdown and the LED
current. See the Applications Information section for brightness control.
LED cathode connection and charge-pump feedback. The charge pump
LED1 regulates to the lowest voltage on the LED1. Therefore, LED1 must be used at
least.
LED2
LED3
LED cathode connection. Connect LEDx to the cathode of one output LED. Let
the LEDx floating if this LED is not populated.
C1P
C1N
C2P
C2N
Charge Pump Capacitor 1 positive connection.
Charge Pump Capacitor 1 negative connection.
Charge Pump Capacitor 2 positive connection.
Charge Pump Capacitor 2 negative connection.
! Pin Assignment
Pin ( Pad )
Number
Pin ( Pad ) Name
TSSOP-16
LED1
LED2
LED3
GND
GND
C1P
QFN-16
C2N
VDD
VDD
EN1
Bare Chip
LED1
LED2
LED3
GND
GND
C1P
1
2
3
4
5
EN2
SET
6
7
C2P
NC
C2P
8
9
C1N
VOUT
C2N
IN
IN
EN1
EN2
SET
NC
LED1
LED2
LED3
GND
GND
C1P
C1N
C2P
VOUT
C1N
VOUT
C2N
IN
IN
EN1
EN2
SET
NC
10
11
12
13
14
15
16
TSSOP-16
QFN-16
V1.1
3/12
2004/10/27
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
