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Data Sheet WHITE LED STEP-UP CONVERTER General Description
The AP3009 is an inductor-based DC/DC converter designed to drive up to six white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain satisfied brightness. A constant frequency 1.2MHz PWM control scheme is employed in this IC, which means the tiny external components can be used. In fact, 1mm tall inductor and 0.22F output capacitor for the typical application is very appropriate. Additionally, the schottky diode in boost circuit is integrated in this chip. AP3009 also provide a disable port to ease its use for different systems. The over output voltage protection is equipped in AP3009. When any LED is broken or in other abnormal conditions, the output voltage will be clamped to 30V. The AP3009 is available in standard SOT-23-6 package.
AP3009 Features
* * * * * * * * Inherently Uniform LED Current High Efficiency: 83% Typical No Need for Extra Schottky Diode Over Output Voltage Protection Drives 2 to 6 LEDs Fast 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductor Requires Only 0.22F Output Capacitor
Applications
* * * * * Cellular Phones Digital Cameras LCD modules GPS Receivers PDAs, Handheld Computers
SOT-23-6
Figure 1. Package Type of AP3009
Apr. 2007 Rev. 1. 4 1
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Pin Configuration
K Package (SOT-23-6)
AP3009
VOUT GND FB
1 2 3
6 5 4
SW VIN CTRL
Figure 2. Pin Configuration of AP3009 (Top View)
Pin Description
Pin Number 1 2 3 4 5 6 Pin Name VOUT GND FB CTRL VIN SW Function Output Pin. Connected to the cathode of internal schottky diode Ground Pin Voltage Feedback. Reference voltage is 200mV Shutdown and Dimming Pin. Connect to 1.8V or higher to enable device; Connect to 50mV or less to disable device; Connect to a voltage between 1.8V and 50mV to achieve linear dimming Input Supply Pin. Must be locally bypassed Switch Pin. Connect external inductor
Apr. 2007 Rev. 1. 4 2
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Functional Block Diagram
FB
3
AP3009
SW
6 1
VOUT
VIN
5
VREF 1.25 V
200 mV
A1 A2
COMPARATOR R S Q
DRIVER
Q1
OVP
2
CTRL
4
RAMP GENERATOR
GND
1.2 MHz OSCILLATOR
Figure 3. Functional Block Diagram of AP3009
Ordering Information
AP3009 Circuit Type Package K: SOT-23-6 E1: Lead Free TR: Tape and Reel
Package
SOT-23-6
Temperature Range
-40 to 85 C
o
Part Number
AP3009KTR-E1
Marking ID
E9T
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Apr. 2007 Rev. 1. 4 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 Atmosphere, no Heat sink) Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) ESD (Machine Model) ESD (Human Body Model) TSTG TLEAD RJA Symbol VIN Value 20 30 20 20 265 150 -65 to 150 260 250 2000 Unit V V V V
oC/W oC oC oC
AP3009
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 2.5 Max 85 16 16 Unit
oC
V V
Apr. 2007 Rev. 1. 4 4
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Electrical Characteristics
(VIN=3V, VCTRL =3V, TA=25oC, unless otherwise specified.)
Parameter Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage FB Pin Bias Current Supply Current Supply Current Switching Frequency Maximum Duty Cycle Switch Current Limit (Note 2) Switch VCE Saturation Voltage Switch Leakage Current CTRL Pin Voltage VCTRL Symbol VIN(min) VIN(max) VFB IFB ICC IQ f DMAX ILIMIT VCESAT TA=25oC, D=40% TA=25oC, D=80% ISW=250mA VSW=5V High Low 48 CTRL Pin Bias Current ICTRL TA=85oC TA=-40oC Schottky Forward Drop Schottky Leakage Current VDROP ID=150mA VR=25V VR=30V 90 40 60 60 50 75 0.7 4 1.8 0.05 72 60 90 V A A VFB=VIN, Not Switching VCTRL=0V 1.9 2.0 0.8 90 IOUT=20mA, 4 LEDs, TA=-40oC to 85oC 188 200 35 2.6 3.2 1.2 93 560 465 300 0.01 5 mV A V Conditions Min 2.5 V 16 212 100 3.3 5.0 1.6 mV nA mA A MHz % mA Typ Max Unit
AP3009
Note 2: The Switch Current Limit is related to Duty Cycle. Please refer to Figure 16 for detail.
Apr. 2007 Rev. 1. 4 5
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics
(VF of WLED is 3.45V @ IF=20mA, unless otherwise noted )
AP3009
85
85
84
84
Efficiency (%)
Efficiency (%)
83
83
82
82
o
81
VIN=3.6V, IOUT=20mA, 4 LEDs CIN=1F, COUT=0.22F, L=22H
81
4 LEDs, IOUT=20mA, TA=25 C CIN=1F, COUT=0.22F, L=22H
80 -50
-25
0
25
50
o
75
100
80 2.5
3.0
3.5
4.0
4.5
5.0
Junction Temperature ( C)
Input Voltage (V)
Figure 4. Efficiency vs. Junction Temperature
Figure 5. Efficiency vs. Input Voltage
86
350
84
Schottky Forward Current (mA)
6
300
250
Efficiency (%)
82
200
80
150
78
VIN=3.6V, IOUT=20mA, TA=25 C CIN=1F, COUT=0.22F, L=22H
o
100
50
76 2 3 4 5
0 0 200 400 600 800 1000
LEDs (pcs)
Schottky Forward Drop (mV)
Figure 6. Efficiency vs. LED's Number
Figure 7. Schottky Forward Current vs. Schorttky Forward Drop
Apr. 2007 Rev. 1. 4 6
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued)
(VF of WLED is 3.45V @ IF=20mA, unless otherwise noted )
AP3009
30
3.5
Shutdown Quiescent Current (A)
25
3.0
20
Supply Current (mA)
2.5
2.0
15
1.5
o
10
1.0
5
0.5
25 C o 100 C o -50 C
0 4 6 8 10 12 14 16
0.0 0 2 4 6 8 10 12 14 16
Input Voltage (V)
Input Voltage (V)
Figure 8. Shutdown Quiescent Current vs. Input Voltage
Figure 9. Supply Current vs. Input Voltage
32.0
5.0
Input Current in Ouput Open Circuit (mA)
31.5
4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 2.5
Output Clamp Voltage (V)
31.0 30.5 30.0 29.5 29.0 28.5 28.0 2 4 6 8 10 12 14 16
3.0
3.5
4.0
4.5
5.0
Input Voltage (V)
Input Voltage (V)
Figure 10. Output Clamp Voltage vs. Input Voltage
Figure 11. Input Current in Output Open Circuit vs. Input Voltage
Apr. 2007 Rev. 1. 4 7
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued)
(VF of WLED is 3.45V @ IF=20mA, unless otherwise noted )
AP3009
1.25
202
1.20
201
Switching Frequency (MHz)
1.15
Feedback Voltage (mV)
-25 0 25 50
o
200
1.10
199
1.05
198
1.00
197
0.95 -50
75
100
196 -50
-25
0
25
50
o
75
100
Junction Temperature ( C)
Junction Temperature ( C)
Figure 12. Switching Frequency vs. Junction Temperature
Figure 13. Feedback Voltage vs. Junction Temperature
0.80 0.78
1.0
Schottky Leakage Current (uA)
Schottky Forward Drop (V)
0.76 0.74 0.72 0.70 0.68 0.66 0.64 0.62 0.60 -50
0.8
VR=10V VR=16V VR=25V
0.6
0.4
0.2
ID=150mA
-25 0 25 50
o
75
100
0.0 -50
-25
0
25
50
o
75
100
Junction Temperature ( C)
Junction Temperature ( C)
Figure 14. Schottky Forward Drop vs. Junction Temperature
Figure 15. Schottky Leackage Current vs. Junction Temperature
Apr. 2007 Rev. 1. 4 8
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Performance Characteristics (Continued)
(VF of WLED is 3.45V @ IF=20mA, unless otherwise noted )
AP3009
700
400
Switch Saturation Voltage (mV)
600
Switching Current Limit (mA)
-50 C o 25 C o 100 C
o
350
300
500
250
400
200
300
150
200
100
100 30
40
50
60
70
80
90
100
50 50
100
150
200
250
300
Duty Cycle (%)
Switch Current (mA)
Figure 16. Switch Current Limit vs. Duty Cycle
Figure 17. Switch Saturation Voltage vs. Switch Current
250
200
Feedback Voltage (mV)
150
100
50
0 0.0
0.5
1.0
1.5
2.0
CTRL Pin Voltage (V)
Figure 18. Feedback Voltage vs. CTRL Pin Voltage
Apr. 2007 Rev. 1. 4 9
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Application
VIN 3V
22
AP3009
VIN Control Signal 1F CTRL
SW
VOUT 0.22F FB 10
AP3009
GND
a. Four White LEDs Driver
VIN 3V
22
Control Signal 1F
VIN CTRL
SW
VOUT 0.22F FB 10
AP3009
GND
b. Five White LEDs Driver
Apr. 2007 Rev. 1. 4 10
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Typical Application (Continued)
VIN 3V
22
AP3009
Control Signal 1F
VIN CTRL
SW
VOUT 0.22F FB 10
AP3009
GND
c. Six White LEDs Driver
C: X5R or X7R Dielectric L: SUMIDA CDRH5D28R-220NC or Equivalent All these circuits can work in full temperature
Figure 19. Typical White LED Drivers
Apr. 2007 Rev. 1. 4 11
BCD Semiconductor Manufacturing Limited
Data Sheet WHITE LED STEP-UP CONVERTER Mechanical Dimensions SOT-23-6 Unit: mm(inch) AP3009
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)
Apr. 2007 Rev. 1. 4 12
1.500(0.059) 1.700(0.067)
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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