
GM2102
CONSTANT CURRENT DC/DC WHITE LED DRIVER
Revision 1, March 2003 4 www.gammamicro.com
PRELIMINARY
TYPICAL APPLICATIONS
1
3
2
4
5
6
LED
SW
Vin
SHDN
GND
Rset
2.5 V PWM
Vin
1.5 V
15mA
1
3
2
4
5
6
LED
SW
Vin
SHDN
GND
Rset
2.5 V PWM
Vin
1.5 V
15mA
Single Cell Driver forTwo White LEDs
Single Cell Driver for One White LED
GM
2102
GM
2102
4.7 uH
D1
C1
4.7 uF
C2
2.2 uF
24.9 K
4.7 uH
D1
C1
4.7 uF
C2
4.7 uF
24.9 K
Rset
1.5K
Rset
1.5K
1
3
2
4
5
6
LED
SW
Vin
SHDN
GND
Rset
2.5 V DC
Vin
1.8 to 3 V
15mA
Two Cell Driver forTwo White LEDs
2
Two Cell Driver forThree White LEDs
5
1
Vin
2.5 V DC
3
15mA
Rset
GND
1.8 to 3 V
SHDN
Vin
SW
4
6
LED
GM
2102
GM
2102
4.7 uH
D1
C1
4.7 uF
C2
2.2 uF
60.4 K
C1
4.7 uF
C2
2.2 uF
4.7 uH
D1
60.4 K
Rset
1.5K
Rset
1.5K