SM8121A Datasheet, PDF(1/19 Page) Nippon Precision Circuits Inc

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SM8121A Datasheet, PDF (1/19 Pages) Nippon Precision Circuits Inc – White LED Driver IC

SM8121A

White LED Driver IC

OVERVIEW

The SM8121A is a high efï¬ciency step-up DC-DC converter. Due to high voltage CMOS process realizing

25V output supply as maximum value, 2 to 6 lights of white LED connected in series can be lighted. By con-

necting in series, current variation among LED is eliminated. Current value sent to white LED can be set by

external resistors. In addition, brightness can also be adjusted by control to FB pin or CE pin.

FEATURES

I Boost-up control using PWM

I 2 to 6 lights of white LED (connected in series)

lighted

I Output current value can be set by external resis-

tors (51â¦: 9.8mA, 33â¦: 15.2mA, 24â¦: 20.8mA)

I Brightness adjustable by control to FB pin or CE

I Current variation among LED decreased by high

precision

I High efï¬cient drive by step-up model

I Supply voltage range: 2.3 to 5.5V

I Maximum output voltage: 25V

I Quiescent current: 400ÂµA (typ)

I Standby current: 1.0ÂµA (max)

I RON (Switching MOS-Tr): 2â¦ (typ)

I Switching frequency: 1.0MHz (typ)

I Output current detection accuracy: Â± 2%

I Small package: SOT23-5 (SM8121AH)

SON-6 (SM8121AD)

PINOUT

(Top view)

I SOT23-5

SW 1

VSS 2

FB 3

I SON-6

5 VDD

4 CE

APPLICATIONS

I Cellular phone

I Pager

I Digital still camera

I Handy terminal

I PDAs

I Portable games

I White LED drive

I LCD bias supply

I Flash memory supply

SW 1

VSS

VDD 3

6 FB

VSS

4 CE

ORDERING INFORMATION

Device

SM8121AH

SM8121AD

Package

SOT23-5

SON-6

NIPPON PRECISION CIRCUITS INC.â1

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