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SM8120

White LED Driver IC

Nippon Precision Circuits  

SM8120A

White LED Driver IC

OVERVIEW

The SM8120A is a high efficiency step-up DC/DC converter. Due to high voltage CMOS process realizing

24V output supply as maximum value, white LED of 2–4 lights connected in series can be lighted. By connect-

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

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

FEATURES

PINOUT

I Boost-up control using PFM

(Top view)

I White LED of 2-4 lights (connected in series)

lighted

I Output current value can be set by external resis-

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

I Brightness adjustable by control to FB pin or CE

VDD 1

5 CE

pin

I Current variation among LED decreased by high

precision

VSS 2

I High efficient drive by step-up model

I Supply voltage range: 2.4 to 5.5V

SW 3

4 FB

I Maximum output voltage: 24V

I Quiescent current: 80µA (typ)

I Standby current: 1.0µA (max)

I RON (Switching MOS-Tr): 2Ω (typ)

I Maximum switching frequency: 500kHz (typ)

I Output current detection accuracy: ± 2%

PACKAGE DIMENSIONS

I Small package: SOT23-5

(Unit: mm)

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

ORDERING INFORMATION

1.9 ± 0.2

2.9 ± 0.2

0.4 ± 0.1

0.12 M

0.95

0.1

0.15

+

−

0.1

0.05

Device

SM8120AH

Package

SOT23-5

NIPPON PRECISION CIRCUITS INC.—1

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