SGM3138 Datasheet, PDF (7/11 Pages) SG Micro Corp – Low Dropout Current Source

SGM3138
TYPICAL APPLICATION
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
C2
1μF
C1
1μF
Li-ion ⁺
Battery
12 11 10 9
C2N C1N C1P C2P
13 _VIN
C_IN
8
VOUT
1μF
15
LED1 to LED6
Enable & Dimming Control
EN/SET
SGM3138
LED1
LED2
LED3
LED4
6
5
4
3
LED5 ²
14 _AGND
PGND
LED6 ¹
7
C_OUT
1µF
Figure 1. For 6-WLEDs Application Circuit
30μs < t_READY 0.5μs < t_HI
0.5μs < t_LO < 500μs
3ms < t_SHDN
EN
0
1
2
3
45
14
15 0
1
Shutdown
I_LEDx
100% _{15/16 14/16 13/16 12/16 3/16}
2/16
100%
1/16
15/16
Shutdown
Figure 2. Brightness Control by Pulse Dimming
SG Micro Corp
7
www.sg-micro.com