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SM8135AB датащи(PDF) 1 Page - Nippon Precision Circuits Inc

номер детали SM8135AB
подробное описание детали  White LED Driver IC
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производитель  NPC [Nippon Precision Circuits Inc]
домашняя страница  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8135AB датащи(HTML) 1 Page - Nippon Precision Circuits Inc

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SM8135A
SEIKO NPC CORPORATION —1
White LED Driver IC
OVERVIEW
The SM8135A is a charge pump type white LED driver. It can drive 1 to 4 backlight white LED connected in
parallel, making it ideal for portable devices with small LCD. The charge pump switches between
×1 bypass
mode,
×1.5 and ×2 boost mode in response to LED drive current requirements. The boost switching occurs in
response to the drive current of all the connected LED and thus supports variations in LED forward-bias volt-
age drop (VF). Besides, the detection of switching is repeated in approx. 1sec-cycle by mode reset action, the
SM8135A can respond to temporary variation of supply voltage. These ingenuities on switching detection can
prolong the battery life to the fullest extent. Each LED drive current is controlled by a 4-channel LED drive
current control circuit. The LED drive current per channel is setup by external resistor. Moreover, the PWM
signal control of EN pin can realize nonstep brightness control (10% to 100%). The IC ON/OFF is controlled
by EN pin.
FEATURES
I
Battery life extension by automatic charge pump
switch between
×1, ×1.5 and ×2 according to the
detection of the LED drive current
I
Controlling 1 to 4 lights of white LED connected
in parallel
I
Set up LED drive current value by external resistor
(120k
Ω: 20mA/ch)
I
1-wire input controlling
I
ON/OFF and brightness control by PWM signal
controlling of EN pin (10 to 100%)
I
Soft start circuit built-in
I
Thermal shut down circuit built-in
I
Input voltage range
No-load current (IOUT = 0mA): 2.7 to 4.6V
Load current (IOUT = 80mA): 3.0 to 4.6V
I
Maximum output voltage: 4.9V (typ)
I
Maximum output current: 80mA (typ)
I
Quiescent current
Not-switching (
×1 mode): 0.3mA (typ)
Switching (
×1.5 mode): 1.5mA (typ)
Switching (
×2 mode): 1.5mA (typ)
I
Standby current: 0.01
µA (typ)
I
Operating frequency: 1MHz (typ)
I
LED drive current accuracy between channel
(REST = 120k
Ω): ± 5% (max)
I
Package: 16-pin QFN
APPLICATIONS
I
Cellular phone
I
PDA
I
Portable games
I
Handy terminal
I
Digital still camera
I
Digital video camera
I
LCD panel back light
I
White LED driving
PINOUT
(Top view)
PACKAGE DIMENSIONS
(Unit: mm)
ORDERING INFORMATION
Device
Package
SM8135AB
16-pin QFN
ISET
EN
GND
VIN
DIN2
DIN1
VOUT
C2P
TOP VIEW
BOTTOM VIEW
3.0 ± 0.08
0.22 ± 0.05
C 0.3
1.8
φ 0.05 M
S
0.02 S AB
0.5
B
SA
0.2 S
S
0.05
A
B


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