ST1208
!
Pin Description
Name
GND
IN
OUT
SET
EN1
EN2
LED1
LED2
LED3
C1P
C1N
C2P
C2N
Function
Ground
Supply voltage input pin (2.7 ~ 5.0 V). Bypass IN to GND with a ceramic
capacitor.
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. I
SET
= 0.6V / R
SET
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
regulates to the lowest voltage on the LED1. Therefore, LED1 must be used at
least.
LED cathode connection. Connect LEDx to the cathode of one output LED. Let
the LEDx floating if this LED is not populated.
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin ( Pad ) Name
TSSOP-16
QFN-16
Bare Chip
LED1
C2N
LED1
LED2
VDD
LED2
LED3
VDD
LED3
GND
EN1
GND
GND
EN2
GND
C1P
SET
C1P
C2P
NC
C2P
C1N
LED1
C1N
VOUT
LED2
VOUT
C2N
LED3
C2N
IN
GND
IN
IN
GND
IN
EN1
C1P
EN1
EN2
C1N
EN2
SET
C2P
SET
NC
VOUT
NC
TSSOP-16
QFN-16
V1.1
3/12
2004/10/27
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
