SM8120 Datasheet, PDF (1/14 Pages) Nippon Precision Circuits Inc – White LED Driver IC

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 R_ON (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