SM8132A
White LED Driver IC
OVERVIEW
The SM8132A is a charge pump DC/DC converter that switches between
×1
and
×1.5
automatically. The
SM8132A 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 SM8132A
can respond to the variation of LED forward voltage. 4-channel of LED drive current control circuit is built-in,
the SM8132A can control 1 to 4 lights of white LED, which are connected in parallel. The LED drive current
per channel is set up by external resistor. Besides, the input signal controlling of EN pin allows ON/OFF and
dimming.
FEATURES
I
I
I
I
I
I
I
Battery life extension by automatic charge pump
switch between
×1
and
×1.5
according to the
detection of the LED drive current
Controlling 1 to 4 lights of white LED connected
in parallel
Set up LED drive current value by external resistor
(5kΩ:5mA/ch, 15kΩ:15mA/ch, 20kΩ:20mA/ch)
1-wire input controlling
ON/OFF and brightness control by input signal
controlling of EN pin
Soft start circuit built-in
Thermal shut down circuit built-in
I
I
I
I
I
I
I
I
Supply voltage range
• No-load current (I
OUT
= 0mA): 2.7 to 4.6V
• Load current (I
OUT
= 80mA): 3.3 to 4.6V
Maximum output voltage: 4.2V (typ)
Maximum output current: 80mA (typ)
Quiescent current
• Not-switching (×1 mode): 0.3mA (typ)
• Switching (
×
1.5 mode): 1.0mA (typ)
Standby current (Power save mode): 0.01µA (typ)
Operating frequency (×1.5 mode): 750kHz (typ)
LED drive current matching (RSET = 20kΩ):
±
3%
Package: 16-pin QFN
WL-CSP (under development)
APPLICATIONS
I
I
I
I
I
I
I
I
Cellular phone
PDA
Portable games
Handy terminal
Digital still camera
Digital video camera
LCD back light
White LED driving
ORDERING INFORMATION
Device
SM8132AB
SM8132AW
Package
16-pin QFN
WL-CSP
NIPPON PRECISION CIRCUITS INC.—1
SM8132A
PINOUT
(Top view)
QFN-16
GND
ISET
DIN3
NC
WL-CSP
(under development)
DIN2
DIN1
C1P
C1M
PGND
VOUT
C2M
C2P
EN
DIN4
NC
VIN
TBD
PIN DESCRIPTION
Number
Name
QFN-16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
WL-CSP
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
PGND
VOUT
C2M
C2P
VIN
NC
DIN4
EN
NC
DIN3
ISET
GND
DIN2
DIN1
C1P
C1M
–
O
–
–
–
–
O
Ip
*1
–
O
I
–
O
O
–
–
Charge pump ground connection
LED drive voltage output
Charge pump capacitor connection 2M
Charge pump capacitor connection 2P
Voltage supply
No connection
LED drive current control output 4
(connect
to ground when not used)
Enable data input (High active)
No connection
LED drive current control output 3
(
connect to ground when not used)
LED drive current setting resistor connection
Ground
LED drive current control output 2
(
connect to ground when not used)
LED drive current control output 1
(
connect to ground when not used)
Charge pump capacitor connection 1P
Charge pump capacitor connection 1M
I/O
Description
*1. Ip: Input with built-in pull-down resistor
NIPPON PRECISION CIRCUITS INC.—3
SM8132A
SPECIFICATIONS
Absolute Maximum Ratings
GND = 0V
Parameter
VIN voltage range
Input voltage range
Output voltage range
VOUT output current
Power dissipation
Junction temperature
Storage temperature range
*1. When mounted on a 4-layer PCB.
Note. The device may suffer breakdown if any one of these parameter ratings is exceeded.
Symbol
V
IN
V
EN
V
DIN1 to 4
V
OUT
I
OUT
P
D
T
JMAX
T
stg
Rating
−0.3
to 5.5
V
GND
– 0.3 to V
IN
+ 0.3
V
GND
– 0.3 to V
IN
+ 0.3
5.5
500
800
(Ta
= 25°C)
*1
+125
−55
to +125
Unit
V
V
V
V
mA
mW
°C
°C
800
800
Power dissipation [mW]
640
600
480
400
320
200
0
25
35
45
55
65
75
85
Operating temperature [°C]
Recommended Operating Conditions
GND = 0V
Rating
Parameter
Pin
Symbol
V
IN0
V
IN
Input voltage range
Ambient temperature range
EN
−
V
ES
Ta
Conditions
min
Supply voltage range
VIN
×1.0
mode, I
OUT
= 0mA
×1.5
mode, I
OUT
= 80mA
Each logic-level pin
2.7
3.3
0
−30
typ
3.6
3.6
−
−
max
4.6
4.6
V
IN
+85
V
V
V
°C
Unit
NIPPON PRECISION CIRCUITS INC.—5
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