SGM3146 Datasheet, PDF (8/12 Pages) SG Micro Corp – Driver with Low Dropout Current Source

SGM3146
TYPICAL APPLICATION
8-Channel Charge Pump White LED
Driver with Low Dropout Current Source
C1
1μF
C2
1μF
Li-ion ⁺
Battery
12 13
14 15
C2P C1P C1N C2N
16 _VIN
C_IN
VOUT ¹⁰
1μF
SGM3146
18 _EN/SET
LED1 ⁸
LED2 ⁷
LED3 ⁶
LED1 to LED8
Enable and Dimming Control
17
AGND
LED4 ⁵
LED5 ⁴
LED6 ³
LED7 ²
PGND
LED8 ¹
9
C_OUT
1µF
Figure 1. For 8-WLEDs Application Circuit
30μs < t_READY 0.5μs < t_HI
0.5μs < t_LO < 500μs
3ms < t_SHDN
EN/SET
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
8
www.sg-micro.com