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SM8133B

White LED Driver IC

Nippon Precision Circuits  

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 (floating) 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.

If the LDO is not used, LDOUT pin should be left open circuit.

SEIKO NPC CORPORATION —20

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