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Data Sheet WHITE LED STEP-UP CONVERTER General Description
The AP3031A is an inductor-based DC/DC boost converter designed to drive LED arrays. 1.2A switching current allows AP3031A to be used in series 10 LEDs application typically. A constant frequency 1MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall 22H inductor and 0.47F output capacitor for the typical application is sufficient. The over output voltage protection is equipped in AP3031A, which protects the IC under open load condition. The AP3031A includes UVLO, soft-start, current limit and OTSD to protect the circuit. The AP3031A is available in standard SOT-23-6 package.
AP3031A Features
* * * * * * * * * Fast 1MHz Switching Frequency Wide Input Voltage Range: 2.7V to 16V Low 200mV Feedback Voltage Output Over Voltage Protection:36V Cycle by Cycle Current Limit: 1.2A Built-in Soft-start Built-in Standby Mode to Achieve High Frequency PWM Dimming Built-in Thermal Shutdown Function Under Voltage Lockout
Applications
* * * * Digital Photo Frame GPS Receiver EPC PDVD
SOT-23-6
Figure 1. Package Type of AP3031A
May 2009 Rev. 1. 1 1
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Pin Configuration
K Package (SOT-23-6)
Pin 1 Dot by Marking
AP3031A
SW GND FB
1 2 3
6 5 4
VIN OV CTRL
Figure 2. Pin Configuration of AP3031A (Top View)
Pin Description
Pin Number 1 2 3 Pin Name SW GND FB 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 AP3031A will soft start to protect system departments. If logic low time is less than about 0.7ms and then enable the IC, the AP3031A 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 output voltage will be clamped Input Supply Pin. Must be locally bypassed Function Switch Pin. Connect external inductor and Schottky
4
CTRL
5 6
OV VIN
May 2009 Rev. 1. 1 2
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Functional Block Diagram
FB SW
SOFT START OV
AP3031A
3
1 5
DRIVER OV
VIN
6
V REF 1 .25 V
200 mV
A1 A2
COMPARATOR
CONTROL LOGIC OVER TEMPERATURE DETECTOR
Q1
CTRL
2
4
STANDBY To Control Logic RAMP GENERATOR
GND
1 MHz OSCILLATOR
Figure 3. Functional Block Diagram of AP3031A
Ordering Information
AP3031A Circuit Type Package K: SOT-23-6 G1: Green TR: Tape and Reel
Package
SOT-23-6
Temperature Range
-40 to 85oC
Part Number
AP3031AKTR-G1 GDH
Marking ID
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
May 2009 Rev. 1. 1 3
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) Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) ESD (Machine Model) ESD (Human Body Model) Symbol VIN VSW VFB VCTRL JA TJ TSTG TLEAD Value -0.3 to 20 -0.3 to 38 -0.3 to 20 -0.3 to VIN 265 Unit V V V V
oC/W
AP3031A
150 -65 to 150 260 600 4000
oC o o
C 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 TOP VIN VCTRL Min -40 2.7 Max 85 16 16 Unit
o
C
V V
May 2009 Rev. 1. 1 4
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Electrical Characteristics
(VIN=5.0V, VCTRL =5.0V, TA=25oC, 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 Switch VCE Saturation Voltage Switch Leakage Current CTRL Pin Voltage CTRL Pin Bias Current OVP Voltage Soft-start Time Standby Time Thermal Shutdown VCTRL ICTRL VOVP tSS tSTB TOTSD Symbol VIN VFB IFB IQ ISHDN f DMAX ILIMIT VCESAT D=60% ISW=0.6A VSW=35V Active high Active low 40 55 36 300 0.7 160 1.8 0.5 72 A V s ms
o
AP3031A
Conditions
Min 2.7
Typ
Max 16
Unit V mV nA mA A MHz % A mV
IOUT=20mA, TA=-40oC to 85oC
188
200 35
212 100 5.0 80 1.3
VFB=VIN, no switching VCTRL=0V
1.5 20 0.75 90 1.0
3.0 50 1 93 1.2 300 0.01
5
A V
C
Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD).
May 2009 Rev. 1. 1 5
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics
(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)
AP3031A
2.5
88
Minimum Operating Voltage (V)
2.4
80
Efficiency (%)
2.3
72
2.2
64
56
L=22H ILED=20mA 10 LEDs
2.1
48 4 8 12 16
2.0 -40 0 40
o
80
120
160
Input Voltage (V)
Temperature ( C)
Figure 4. Efficiency vs. Input Voltage
Figure 5. Minimum Operating Voltage vs. Temperature
4.7 4.6 4.5
100
4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 2 4 6 8 10 12 14 16
Shutdown Quiescent Current (A)
Quiescent Current (mA)
80
60
TA=--40 C TA= 25 C TA= 85 C
o o
o
TA=-40 C TA=25 C
40 4 8 12
o o
o
TA=85 C
16
Input Voltage (V)
Input Voltage (V)
Figure 6. Quiescent Current vs. Input Voltage
Figure 7. Shutdown Quiescent Current vs. Input Voltage
May 2009 Rev. 1. 1 6
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued)
(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)
AP3031A
2.0 200
1.6
CTRL Voltage (V)
CTRL Current (A)
150
1.2
100
0.8
50
0.4 -50
0 0 50 100
o
150
0
4
8
12
16
Temperature ( C)
CTRL Voltage (V)
Figure 8. CTRL Pin Voltage vs. Temperature
Figure 9. CTRL Current vs. CTRL Voltage
220
1.4
Feedback Voltage (V)
210
1.2
Frequency (MHz) ILED=20mA
200
1.0
190
0.8
180 -40 0 40 80
o
0.6 120 -40 0 40
o
80
120
160
Temperature ( C)
Temperature ( C)
Figure 10. Feedback Voltage vs. Temperature
Figure 11. Frequency vs. Temperature
May 2009 Rev. 1. 1 7
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued)
(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)
AP3031A
40
1.2
38
1.1
OVP Voltage (V)
Frequency (MHz)
36
1.0
34
0.9
32
0.8
30 -40 0 40
o
0.7
80 120 160
4
8
12
16
Temperature ( C)
Input Voltage (V)
Figure 12. OVP Voltage vs. Temperature
Figure 13. Frequency vs. Input Voltage
700
70 65
Switch Saturation Voltage (mV)
600
60
o
500
Case Temperature ( C)
55 50 45 40 35 30 25
400
300
200
100
-40 C o 25 C o 85 C
0.2 0.4 0.6 0.8 1.0
o
VOUT=10V
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280
0 0.0
Switch Current (A)
Output Current (mA)
Figure 14. Switch Saturation Voltage vs. Switch Current
Figure 15. Case Temperature vs. Output Current
May 2009 Rev. 1. 1 8
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Application AP3031A
VIN 5V CIN 10 F On/Off
L 22H
D
VOUT 10 LEDs
VIN
SW OV
CTRL
AP3031A
GND FB
COUT 0.47F
R ISET
Figure 16. Typical Application of AP3031A (10 WLEDs Series)
May 2009 Rev. 1. 1 9
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Mechanical Dimensions SOT-23-6 Unit: mm(inch) AP3031A
2.820(0.111) 3.020(0.119) 0.300(0.012) 0.400(0.016) 0.300(0.012) 0.600(0.024)
0 8 0.200(0.008)
6 2.650(0.104) 2.950(0.116)
5
4
Pin 1 Dot by Marking
1
2
3
0.700(0.028)REF
0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.100(0.004) 0.100(0.004) 0.200(0.008)
1.050(0.041) 1.050(0.041) 1.150(0.045) 1.250(0.049)
May 2009 Rev. 1. 1 10
1.500(0.059) 1.700(0.067)
BCD Semiconductor Manufacturing Limited
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others.
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