Data Sheet
WHITE LED STEP-UP CONVERTER
General Description
The AP3031 is an inductor-based DC/DC boost con-
verter designed to drive LED arrays. 1.4A switching
current allows AP3031 to be used in different 7' to 10'
LCD panel backlights (3*13 LED arrays typically).
A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external com-
ponents can be used. Specifically, 1mm tall 4.7
μ
H
inductor and 0.47
μ
F output capacitor for the typical
application is sufficient.
The over output voltage protection is equipped in
AP3031, which protects the IC under open load condi-
tion. The AP3031 includes UVLO, soft-start, current
limit and OTSD to protect the circuit.
The AP3031 is available in standard SOT-23-6, TSOT-
23-6 and SOIC-8 packages.
AP3031
Features
·
·
·
·
·
·
·
·
·
·
·
Up to 92% Efficiency
(V
IN
=9V, I
OUT
=260mA)
Up to 84% Efficiency
(V
IN
=5V, I
OUT
=260mA)
Fast 1MHz Switching Frequency
Wide Input Voltage Range: 2.7V to 16V
Low 200mV Feedback Voltage
Output Over Voltage Protection
Cycle by Cycle Current Limit: 1.4A
Built-in Soft-start
Built-in Standby Mode to Achieve High Fre-
quency PWM Dimming
Built-in Thermal Shutdown Function
Under Voltage Lockout
Applications
·
·
·
·
·
7' to 10' LCD Panels
Digital Photo Frame
GPS Receiver
EPC
PDVD
SOT-23-6
TSOT-23-6
SOIC-8
Figure 1. Package Types of AP3031
Dec. 2012 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
WHITE LED STEP-UP CONVERTER
Pin Configuration
K/KT Package
(SOT-23-6/TSOT-23-6)
Pin 1 Mark
AP3031
M Package
(SOIC-8)
SW
GND
FB
1
2
3
6
5
4
V
IN
OV
CTRL
FB
GND
GND
SW
1
2
3
4
8
7
6
5
CTRL
OV
GND
V
IN
Figure 2. Pin Configuration of AP3031 (Top View)
Pin Description
Pin Number
6-Pin
1
2
3
8-Pin
4
2, 3, 6
1
Pin Name
SW
GND
FB
Function
Switch Pin. Connect external inductor and Schottky
Ground Pin
Voltage Feedback Pin. Reference voltage is 200mV
Enable and Dimming Control Pin. Connect to a high input to enable the IC or a low input to
disable the IC.
If logic low time is more than about 0.7ms and then enable the IC, the AP3031 will soft start to
protect system departments. If logic low time is less than about 0.7ms and then enable the IC,
the AP3031 will hold on standby mode and start directly to achieve high frequency dimming
Over-voltage Protection Input Pin. Connect to the output directly. On OVP condition, the out-
put voltage will be clamped
Input Supply Pin. Must be locally bypassed
4
8
CTRL
5
6
7
5
OV
V
IN
Dec. 2012 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
WHITE LED STEP-UP CONVERTER
Functional Block Diagram
FB
3 (1)
SOFT
START
OV
AP3031
SW
1 (4)
5 (7)
OV
V
IN
6 (5)
V
REF
1 .25 V
200 mV
A1
A2
COMPARATOR
DRIVER
CONTROL
LOGIC
OVER
TEMPERATURE
DETECTOR
Q1
Σ
CTRL
4 (8)
STANDBY
To Control
Logic
RAMP
GENERATOR
2
(2, 3, 6)
GND
1 MHz
OSCILLATOR
A (B)
A SOT-23-6/TSOT-23-6
B SOIC-8
Figure 3. Functional Block Diagram of AP3031
Ordering Information
AP3031
Circuit Type
Package
K: SOT-23-6
KT: TSOT-23-6
M: SOIC-8
Package
SOT-23-6
TSOT-23-6
SOIC-8
-40 to 85
o
C
-
G1: Green
TR: Tape and Reel
Blank: Tube
Temperature
Range
Part Number
AP3031KTR-G1
AP3031KTTR-G1
AP3031M-G1
AP3031MTR-G1
GEC
L1E
Marking ID
Packing Type
Tape & Reel
Tape & Reel
Tube
Tape & Reel
3031M-G1
3031M-G1
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Dec. 2012 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
WHITE LED STEP-UP CONVERTER
Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage
SW Voltage
FB Voltage
CTRL Voltage
Thermal Resistance
(Junction to Ambient, No Heat Sink)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
ESD (Machine Model)
ESD (Human Body Model)
Symbol
V
IN
V
SW
V
FB
V
CTRL
θ
JA
T
J
T
STG
T
LEAD
Value
20
38
20
20
SOT-23-6/TSOT-23-6
SOIC-8
150
-65 to 150
260
600
4000
265
120
Unit
V
V
V
V
o
C/W
AP3031
o
C
o
C
o
C
V
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods
may affect device reliability.
Recommended Operating Conditions
Parameter
Operating Temperature Range
Input Voltage
CTRL Voltage
Symbol
T
OP
V
IN
V
CTRL
Min
-40
2.7
Max
85
16
16
Unit
o
C
V
V
Dec. 2012 Rev. 1. 6
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BCD Semiconductor Manufacturing Limited
Data Sheet
WHITE LED STEP-UP CONVERTER
Electrical Characteristics
(V
IN
=5.0V, V
CTRL
=5.0V, T
A
=25
o
C, unless otherwise specified.)
Parameter
Operating Voltage
Feedback Voltage (Note 2)
FB Pin Bias Current
Quiescent Current
Shutdown Quiescent Current
Switching Frequency
Maximum Duty Cycle
Switch Current Limit (Note 3)
Switch V
CE
Saturation Voltage
Switch Leakage Current
CTRL Pin Voltage
CTRL Pin Bias Current
OVP Voltage
Soft-start Time
Standby Time
Thermal Shutdown
Thermal Resistance
(Junction to Case)
V
CTRL
I
CTRL
V
OVP
t
SS
t
STB
T
OTSD
θ
JC
Symbol
V
IN
V
FB
I
FB
I
Q
I
SHDN
f
D
MAX
I
LIMIT
V
CESAT
D=60%
I
SW
=0.6A
V
SW
=16V
Active high
Active low
35
15.5
60
17.5
250
0.7
155
60
1.8
0.5
85
19.5
μA
V
μs
ms
o
C
o
C/W
AP3031
Conditions
Min
2.7
Typ
Max
16
Unit
V
mV
nA
mA
μA
MHz
%
A
mV
I
OUT
=20mA, 3 LEDs,
T
A
=-40
o
C to 85
o
C
188
200
35
212
100
5.0
80
1.3
V
FB
=V
IN
, no switching
V
CTRL
=0V
3.0
20
0.75
90
1.2
4.0
50
1
93
1.4
300
0.01
5
μA
V
Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD).
Note 3: The switch current limit is related to duty cycle. Please refer to Figure 15 for detail.
Dec. 2012 Rev. 1. 6
5
BCD Semiconductor Manufacturing Limited
DIY/Open Source Hardware
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