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SM8131B Datasheet Preview

SM8131B Datasheet

White LED Driver IC

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SM8131B
White LED Driver IC
OVERVIEW
The SM8131B is a charge pump DC/DC converter that switches between ×1 and ×1.5 automatically. The
SM8131B switches between ×1 and ×1.5 according to detected LED drive current, so that the battery life can
be prolonged to the fullest extent. Since the connected LED are all detected for the switching, the SM8131B
can respond to the variation of LED forward voltage. 6-channel of LED drive current control circuit is built-in,
the SM8131B can control 1 to 6 lights of white LED, which are connected in parallel. The LED drive current
per channel is set up by external resistor. Besides, by setting up SEL1/SEL2 pins, 6-channel of LED drive cur-
rent control circuit can be divided to 2-groups, and input signal controlling of EN1/EN2 pins allow ON/OFF
and dimming per group.
FEATURES
I Battery life extension by automatic charge pump
switch between ×1 and ×1.5 according to the
detection of the LED drive current
I Controlling 1 to 6 lights of white LED connected
in parallel
I Set up LED drive current value by external resistor
(5k:5mA/ch, 15k:15mA/ch, 20k:20mA/ch)
I Dividing 6-channel to 2-groups by setting up
SEL1/SEL2 pins (L/L = 6:0ch, L/H = 5:1ch,
H/L = 4:2ch, H/H = 3:3ch)
I 2-wire input controlling (1-wire input controlling
when SEL1/SEL2 pins are set to “LOW”)
I ON/OFF and brightness control by input signal
controlling of EN1/EN2 pins
I Supply voltage range
• No-load current (IOUT = 0mA): 2.7 to 4.6V
• Load current (IOUT = 120mA): 3.3 to 4.6V
I Maximum output voltage: 4.2V (typ)
I Maximum output current: 120mA (typ)
I Quiescent current
• Not-switching (×1 mode): 0.7mA (typ)
• Switching (×1.5 mode): 2.0mA (typ)
I Standby current (Power save mode): 0.01µA (typ)
I Operating frequency (×1.5 mode): 750kHz (typ)
I LED drive current accuracy (RSET = 20k)
:20mA ± 3%
I Input signal frequency for dimming (Duty = 50%)
:150kHz (max)
I Package:20-pin QFN
APPLICATIONS
I Cellular phone
I PDA
I Portable games
I Handy terminal
I Digital still camera
I Digital video camera
I LCD back light
I White LED driving
PINOUT
(Top view)
15 14 13 12 11
EN1
DIN6
DIN5
DIN4
GND
16
17
18
19
20
10 VREG
9 C2P
8 C2M
7 PGND
6 C1M
1 23 4 5
PACKAGE DIMENSIONS
(Unit: mm)
4.20 ± 0.20
4.00 ± 0.10
1
0.50
0.05
0.22 ± 0.05
0.05 M
0.60 ± 0.10
ORDERING INFORMATION
Device
SM8131B00B
Package
20-pin QFN
NIPPON PRECISION CIRCUITS INC.—1




NPC

SM8131B Datasheet Preview

SM8131B Datasheet

White LED Driver IC

No Preview Available !

BLOCK DIAGRAM
SM8131B
GND
DIN4
DIN5
DIN6
EN1
DIN3
DIN2
DIN1
ISET
C1P
LED current
control
VOUT mode
controller
1.5 Charge pump
VREG
EN2
SEL1
SEL2
VOUT
VIN
C1M PGND C2M
C2P VREG
PIN DESCRIPTION
Number
Name
1 DIN3
2 DIN2
3 DIN1
4 ISET
5 C1P
6 C1M
7 PGND
8 C2M
9 C2P
10 VREG
11 VIN
12 VOUT
13 SEL2
14 SEL1
15 EN2
16 EN1
17 DIN6
18 DIN5
19 DIN4
20 GND
*1. Input with built-in pull-down resistor
I/O
O
O
O
I
O
I
I
Ip*1
Ip*1
O
O
O
Description
LED drive current control output 3 (connect to GND when not used)
LED drive current control output 2 (connect to GND when not used)
LED drive current control output 1 (connect to GND when not used)
LED drive current setting resistor connection
Charge pump capacitor connection 1P
Charge pump capacitor connection 1M
Charge pump ground connection
Charge pump capacitor connection 2M
Charge pump capacitor connection 2P
LED drive current control voltage monitor (Don't connect any lines)
Voltage supply
LED driving voltage output
Group setting data input 2
Group setting data input 1
Group B enable data input (High active)
Group A enable data input (High active)
LED drive current control output 6 (connect to GND when not used)
LED drive current control output 5 (connect to GND when not used)
LED drive current control output 4 (connect to GND when not used)
Ground
NIPPON PRECISION CIRCUITS INC.—2


Part Number SM8131B
Description White LED Driver IC
Maker NPC
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