WD3131
WD3131
High Efficiency, 26V Step-Up White LED
Driver
Descriptions
The WD3131 is a constant current, high efficiency LED
driver. Internal MOSFET can drive up to 6 white LEDs
in series and 3S13P LEDs with Min. 1.5A current limit
and 26V OVP. A Pulse-Width-Modulation (PWM) signal
can be applied to the EN pin for LED dimming. The
device operates with 1MHz fixed switching frequency
to reduce output ripple, improve conversion efficiency,
and allows use small external components.
The WD3131 is available in SOT-23-6L package.
Standard product is Pb-free and Halogen-free.
SOT-23-6L
Http//:www.sh-willsemi.com
Features
Input voltage range
Open LED Protection
Reference Voltage
Switching frequency
Efficiency
Main switch current limit
PWM Dimming frequency
PWM Dimming Duty
: 3~5.5V
: 26V
: 200mV (±5%)
: 1MHz (Typ.)
: Up to 92%
: 1.5A (Min.)
: (5KHz to 200KHz)
: Min. 4%
3131
EAYW
6
5
4
Pin configuration (Top view)
Applications
Smart Phones
Tablets
Portable games
1
2
3
3131
EA
Y
W
= Device Code
= Package Code
= Year code
= Week code
Marking
Order information
Device
WD3131E-6/TR
Package
SOT-23-6L
Shipping
3000/Reel&Tape
Will Semiconductor Ltd.
1
Nov, 2014 - Rev. 1.0
WD3131
Typical applications
Pin descriptions
Symbol
LX
GND
FB
EN
OVP
VIN
Pin No.
1
2
3
4
5
6
Descriptions
Switch Output
Ground
Feedback
Enable, Active High
OVP Pin, Connect
to VOUT
Power Supply
Block diagram
Will Semiconductor Ltd.
2
Nov, 2014 - Rev. 1.0
WD3131
Absolute maximum ratings
Parameter
VIN pin voltage range
OVP pin voltage range
EN pin voltage range
LX pin voltage range (DC)
Power Dissipation – SOT-23-6L (Note 1)
Power Dissipation – SOT-23-6L (Note 2)
Junction to Ambient Thermal Resistance – SOT-23-6L (Note 1)
Junction to Ambient Thermal Resistance – SOT-23-6L (Note 2)
Symbol
V
IN
V
OVP
-
-
P
D
R
θJA
T
J
T
L
Topr
Tstg
Value
-0.3½6.5
-0.3½30
-0.3½V
IN
-0.3½30
0.5
0.3
250
416
150
260
-40 ~ 85
-55 ~ 150
Unit
V
V
V
V
W
W
o
o
C/W
C/W
o
o
o
o
Junction temperature
Lead temperature(Soldering, 10s)
Operation temperature
Storage temperature
C
C
C
C
These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings” may cause
substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the
specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Note 1:
Surface mounted on FR-4 Board using 1 square inch pad size, dual side, 1oz copper
Note 2:
Surface mounted on FR-4 board using minimum pad size, 1oz copper
Will Semiconductor Ltd.
3
Nov, 2014 - Rev. 1.0
WD3131
Electronics Characteristics
(Ta=25
o
C, V
IN
=3.7V, V
EN
=V
IN
, C
IN
=C
OUT
=4.7uF, unless otherwise noted)
Parameter
Operation Voltage Range
Under Voltage Lockout
Over-Voltage Threshold
UVLO Hysteresis
Quiescent Current
Supply Current
Shutdown Current
Operation Frequency
Maximum Duty Cycle
PWM Dimming Clock Rate
Feedback Reference
On Resistance
Current Limit
EN Threshold Voltage
EN Sink Current
Thermal Shutdown Temperature
T
SD
Hysteresis
Shutdown Delay
V
REF
R
ON
I
LIM
V
ENL
V
ENH
I
EN
T
SD
T
SD-HYS
t
SHDN
1.5
3
160
30
1
I
LX
=100mA
1.5
0.4
Symbol
V
IN
V
UVLO
V
OVP
V
UVLO-HYS
I
Q
I
S
I
SD
f
OSC
D
MAX
Recommended
No Switching
Switching
V
EN
< 0.4V
0.8
92
5
190
200
0.3
200
210
1
V
IN
Rising
Test Condition
Min
3
1.8
23
Typ
--
2.2
26
0.1
0.3
1.5
1
3
1
1.2
Max
5.5
2.5
29
Units
V
V
V
V
mA
mA
μA
MHz
%
KHz
mV
Ω
A
V
V
μA
°C
°C
ms
Will Semiconductor Ltd.
4
Nov, 2014 - Rev. 1.0
WD3131
Typical Characteristics
(Ta=25
o
C, unless otherwise noted)
100
95
90
100
95
90
Efficiency(%)
80
75
70
65
60
Efficiency(%)
85
85
80
75
70
65
60
3S13P LEDs
L = 10uH
V
IN
=3.2V
V
IN
=3.6V
V
IN
=4.2V
V
IN
=5.0V
20
40
60
80
100
120
140
160 180
200
220
240
260
3S13P LEDs
L = 4.7uH
V
IN
=3.2V
V
IN
=3.6V
V
IN
=4.2V
V
IN
=5.0V
20
40
60
80
100
120
140
160 180
200
220
240
260
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
Efficiency vs. Output Current
100
95
90
Efficiency(%)
Efficiency(%)
85
80
75
70
65
60
6S6P LEDs
L = 10uH
V
IN
=3.2V
V
IN
=3.6V
V
IN
=4.2V
V
IN
=5.0V
10 20 30 40 50 60 70 80 90 100 110 120
Output Current (mA)
100
95
90
85
80
75
70
65
60
6S6P LEDs
L = 4.7uH
V
IN
=3.2V
V
IN
=3.6V
V
IN
=4.2V
V
IN
=5.0V
10 20 30 40 50 60 70 80 90 100 110 120
Output Current (mA)
Efficiency vs. Output Current
Efficiency vs. Output Current
210
208
206
Output Current (mA)
202
200
198
196
194
192
190
2.5
3.0
3.5
4.0
4.5
3S10P LEDs
5.0
5.5
Output Current (mA)
204
210
208
206
204
202
200
198
196
194
192
190
-40
-20
0
20
40
3S10P LEDs
V
IN
=3.3V
V
IN
=4.2V
V
IN
=5.0V
60
80
Input Voltage (V)
Temperature (
℃
)
LED Current vs. Supply Voltage
LED Current vs. Temperature
Will Semiconductor Ltd.
5
Nov, 2014 - Rev. 1.0
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