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SM8135B

White LED Driver IC

Nippon Precision Circuits  

SM8135B

LED × 3, ILED MAX = 20mA

C1 = 1µF C2 = 1µF

C1M C1P

C2M C2P

2.7 to 4.6V VIN

C4 = 1µF

Charge pump

1/ 1.5/ 2

Mode control

&

Output voltage control

&

Protection

TSD

EN

Control

logic

Current

control

&

Current

detect

VOUT

C3 = 1µF

MAX 20mA 3

DIN1

DIN2

DIN3

DIN4 (connect to ground)

ISET

GND

NC

(open at any time)

GND PGND

RSET = 120kΩ

Note. If the driving LED is less than 4 pcs, unused DIN pins should be connect to GND.

Dimming and ON/OFF control is performed using pulse input on EN with a maximum LED current determined by resistor RSET (see

P.6 “Setting LED current using pulse input on EN”).

The HIGH-level and LOW-level pulsewidths for the pulse input on EN must be 3.0µs or longer (see “Electrical Characteristics”).

SEIKO NPC CORPORATION —16

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