SM8120AH 参数 Datasheet PDF下载

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

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PINOUT

(Top view)

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Boost-up control using PFM

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

lighted

Output current value can be set by external resis-

tors (51

Ω

: 9.8mA, 33

Ω

: 15.2mA, 24

Ω

: 20.8mA)

Brightness adjustable by control to FB pin or CE

pin

Current variation among LED decreased by high

precision

High efficient drive by step-up model

Supply voltage range: 2.4 to 5.5V

Maximum output voltage: 24V

Quiescent current: 80

µ

A (typ)

Standby current: 1.0

µ

A (max)

R

ON

(Switching MOS-Tr): 2

Ω

(typ)

Maximum switching frequency: 500kHz (typ)

Output current detection accuracy:

±

2%

Small package: SOT23-5

VDD

1

5

CE

VSS

2

SW

3

4

FB

PACKAGE DIMENSIONS

(Unit: mm)

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Cellular phone

Pager

Digital still camera

Handy terminal

PDAs

Portable games

White LED drive

LCD bias supply

Flash memory supply

+ 0.2

1.6

−

0.1

+ 0.2

2.8

−

0.3

1.9 ± 0.2

2.9 ± 0.2

0.4 ± 0.1

+ 0.1

0.15

−

0.05

0.12 M

1.1 ± 0.1

0 ~ 0.10

0.8 ± 0.1

0.95

0.1

ORDERING INFORMATION

Device

SM8120AH

Package

SOT23-5

NIPPON PRECISION CIRCUITS INC.—1

0.20MIN

APPLICATIONS