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| SM8133B Datasheet, PDF (17/20 Pages) Nippon Precision Circuits Inc – White LED Driver IC | |||
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SM8133B
TYPICAL APPLICATION CIRCUIT
If the RESETB input is connected to the microcontroller power supply, the SM8133B is reset when microcon-
troller power supply stops, and operation transfers to standby mode. In circuits where the SM8133B logic-level
inputs would become open circuit (ï¬oating) when the microcontroller supply stops, pull-down resistors should
be connected to each logic-level signal input.
2.7 to 4.6V
Battery
VIN
C4
2.2µF
C1
1.0µF
C1M C1P
C2
1.0µF
C2M C2P
Charge pump
1/ 1.5
LDO for
microcontroller
power source
Mode control
&
Output voltage control
&
Protection
VDD
Microcontroller
RESETB
Pull down
SCK
SDA
EN
Thermal
shut down
Control
logic
Current
control
&
Under
current
detector
Pull down
LDO 3V
&
Protection
GND PGND
VOUT
C3
2.2µF
Back Light
Max 30mA 6ch
DIN1
DIN2
DIN3
DIN4
DIN5
DIN6
DIN7
Flash
Max 150mA
LDOUT 3V ± 2% (VIN ⥠3.2V)
Max 100mA
C5
1.0µF
Note. If the driving LEDs are less than 7 pcs, the unused DIN pins should be connected to GND.
NIPPON PRECISION CIRCUITS INC.â17
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