BCDSEMI AP3030

Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
General Description
Features
The AP3030 is an inductor-based DC/DC converter
designed to drive up to eight white LEDs in series or 2
rows of LEDs with 5 for each in parallel for backlight.
Only one feedback resistor is needed to control the
LED current and obtain required brightness.
·
·
·
·
·
A constant frequency 1.2MHz PWM control scheme is
employed in this IC, which means tiny external components can be used. Specifically, 1mm tall inductor
and 0.22µF output capacitor for a typical application
are sufficient. Additionally, the schottky diode in boost
circuit is integrated on this chip. AP3030 also provides
a disable pin to ease its use for different systems.
·
·
·
Inherently Uniform LED Current
High Efficiency up to 84%
No Need for External Schottky Diode
Output Over-Voltage Protection (OVP)
Drives up to 8 LEDs in Series or 2 Rows of LEDs
with 5 for Each in Parallel
Fixed 1.2MHz Switching Frequency
Uses Tiny 1mm Tall Inductor
Requires Only 0.22µF Output Capacitor
Applications
The output over-voltage protection is implemented in
AP3030. When any LED is broken or in other abnormal conditions, the output voltage will be clamped to
30V.
·
·
·
·
·
The AP3030 is available in standard SOT-23-6 and
TSOT-23-6 packages.
Cellular Phones
Digital Cameras
LCD modules
GPS Receivers
PDAs, Handheld Computers
TSOT-23-6
SOT-23-6
Figure 1. Package Types of AP3030
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Pin Configuration
K/KT Package
(SOT-23-6/TSOT-23-6)
Pin 1 Dot by Marking
SW
1
6
VIN
GND
2
5
VOUT
FB
3
4
CTRL
Figure 2. Pin Configuration of AP3030 (Top View)
Pin Description
Pin Number
Pin Name
Function
1
SW
2
GND
3
FB
4
CTRL
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
5
VOUT
Output Pin. Connected to the cathode of internal schottky diode
6
VIN
Switch Pin. Connect external inductor
Ground
Voltage Feedback. Reference voltage is 200mV
Input Supply Pin. Must be locally bypassed
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Functional Block Diagram
FB
SW
3
1
5
SOFT
START
VIN
6
VREF
1.25 V
200 mV
OVP
DRIVER
A1
Q
R
A2
VOUT
Q1
S
COMPARATOR
Σ
CTRL
2
4
GND
RAMP
GENERATOR
1.2 MHz
OSCILLATOR
Figure 3. Functional Block Diagram of AP3030
Ordering Information
AP3030
-
Circuit Type
E1: Lead Free
G1: Green
Package
TR: Tape and Reel
K: SOT-23-6
KT: TSOT-23-6
Package
Temperature
Range
SOT-23-6
-40 to 85oC
TSOT-23-6
o
-40 to 85 C
Part Number
Lead Free
Marking ID
Green
Lead Free
Green
Packing Type
AP3030KTR-E1
AP3030KTR-G1
EEB
GEB
Tape & Reel
AP3030KTTR-E1
AP3030KTTR-G1 S9G
L9G
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
20
V
SW Voltage
VSW
30
V
FB Voltage
VFB
20
V
VCTRL
20
V
RθJA
265
oC/W
TJ
150
o
C
TSTG
-65 to 150
o
C
TLEAD
260
o
C
ESD (Machine Model)
250
V
ESD (Human Body Model)
2000
V
CTRL Voltage
Thermal Resistance (Junction to Atmosphere, No Heat Sink)
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
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
Symbol
Min
Max
Operating Temperature Range
TOP
-40
85
o
Input Voltage
VIN
2.5
16
V
CTRL Voltage
VCTRL
16
V
Aug. 2008 Rev. 1. 1
Unit
C
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Electrical Characteristics
(VIN=3V, VCTRL =3V, TA=25oC, unless otherwise specified.)
Parameter
Symbol
Minimum Operating Voltage
VIN(min)
Maximum Operating Voltage
VIN(max)
Conditions
Min
Typ
Max
Unit
2.5
V
Feedback Voltage
VFB
FB Pin Bias Current
IFB
Quiescent Current
IQ
16
IOUT=20mA, 4 LEDs,
TA=-40oC to 85oC
188
200
212
mV
35
100
nA
VFB=VIN, no switching
1.5
2.5
3.2
mA
VCTRL=0V
2.0
3.2
5.0
µA
f
0.9
1.2
1.5
MHz
Maximum Duty Cycle
DMAX
90
93
Switch Current Limit (Note 2)
ILIMIT
Shutdown Quiescent Current
Switch Frequency
Switch VCE Saturation Voltage
ISHDN
VCESAT
Switch Leakage Current
CTRL Pin Voltage
VCTRL
D=40%
550
D=80%
550
ISW=250mA
360
VSW=5V
0.01
High
Schottky Forward Drop
VDROP
Schottky Leakage Current
5
µA
V
55
TA=85oC
50
TA=-40oC
75
ID=150mA
0.7
VR=23V
0.1
VR=27V
Soft Start Time
mV
0.05
40
ICTRL
mA
1.8
Low
CTRL Pin Bias Current
%
72
µA
V
4
µA
150
t
300
µS
Note 2: The switch current limit is related to duty cycle. Please refer to Figure 16 for detail.
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Typical Performance Characteristics
(VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted )
83
86
82
84
81
82
Efficiency (%)
Efficiency (%)
80
79
78
77
80
78
76
76
CIN=1µF, COUT=0.22µF, L=22µH
-25
0
25
50
75
CIN=1µF, COUT=0.22µF, L=22µH
72
74
73
-50
O
IOUT=20mA, 8LEDs,TA=25 C
74
VIN=3.6V, IOUT=20mA, 8LEDs
75
70
3.0
100
3.5
o
Junction Temperature ( C)
4.0
4.5
5.0
Input Voltage (V)
Figure 4. Efficiency vs. Junction Temperature
Figure 5. Efficiency vs. Input Voltage
350
86
85
Schottky Forward Current (mA)
300
84
Efficiency (%)
83
82
81
80
79
O
VIN=3.6V, IOUT=20mA,TA=25 C
78
CIN=1µF, COUT=0.22µF, L=22µH
250
200
150
100
50
77
0
76
2
3
4
5
6
7
0
8
200
400
600
800
1000
Schottky Forward Drop (mV)
LED's Number
Figure 6. Efficiency vs. LED's Number
Figure 7. Schottky Forward Current
vs. Schottky Forward Drop
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Typical Performance Characteristics (Continued)
(VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted )
3.0
2.5
25
Quiescent Current (mA)
Shutdown Quiescent Current (µA)
30
20
15
10
5
2.0
1.5
1.0
O
-50 C
O
25 C
O
100 C
0.5
0
2
4
6
8
10
12
14
0.0
16
0
2
4
Input Voltage (V)
6
8
10
12
14
16
Input Voltage (V)
Figure 8. Shutdown Quiescent Current vs. Input Voltage
Figure 9. Quiescent Current vs. Input Voltage
36
6.0
5.5
5.0
Input Current (mA)
Output Clamp Voltage (V)
34
32
30
4.5
4.0
3.5
3.0
28
2.5
2.0
2.5
26
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
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Typical Performance Characteristics (Continued)
(VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted )
210
1.35
208
1.30
206
Feedback Voltage (mV)
1.40
Frequency (MHz)
1.25
1.20
1.15
1.10
1.05
204
202
200
198
196
1.00
194
0.95
192
0.90
-50
-25
0
25
50
75
190
-50
100
-25
0
25
50
75
100
o
o
Junction Temperature ( C)
Junction Temperature ( C)
Figure 12. Switch Frequency vs. Junction Temperature
Figure 13. Feedback Voltage
vs. Junction Temperature
0.50
0.78
0.45
VR=10V
0.40
VR=16V
0.35
VR=23V
Schottky Leakage Current (µA)
0.80
Schottky Forward Drop (V)
0.76
0.74
0.72
0.70
0.68
0.66
0.64
0.25
0.20
0.15
0.10
0.05
0.62
0.60
-50
0.30
-25
0
25
50
75
0.00
-50
100
o
-25
0
25
50
75
100
o
Junction Temperature ( C)
Junction Temperature ( C)
Figure 14. Schottky Forward Drop
vs. Junction Temperature
Figure 15. Schottky Leakage Current
vs. Junction Temperature
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Typical Performance Characteristics (Continued)
(VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted )
700
450
400
Saturation Voltage (mV)
Current Limit (mA)
600
500
400
300
O
-50 C
O
25 C
O
100 C
200
100
30
40
50
60
70
80
350
300
250
200
150
100
50
50
90
100
150
200
250
300
Switch Current (mA)
Duty Cycle (%)
Figure 17. Switch Saturation Voltage
Figure 16. Switch Current Limit vs. Duty Cycle
vs. Switch Current
Feedback Voltage VFB (mV)
250
200
150
100
50
0
0.0
0.5
1.0
1.5
2.0
2.5
CTRL Voltage (V)
Figure 18. Feedback Voltage vs. CTRL Pin Voltage
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Typical Application
VIN ≥ 3V
L
22µΗ
SW
VIN
Control
Signal
VOUT
COUT
AP3030
CTRL
GND
CIN
0.22µF
FB
10Ω
1µF
C: X5R or X7R Dielectric
L: SUMIDA CDRH5D28R-220NC or Equivalent
This circuit can work in full temperature
Figure 19. Typical Application of Eight LED Drivers
VIN ≥ 3V
L
22µΗ
VIN
Control
Signal
SW
VOUT
COUT
AP3030
CTRL
CIN
0.22µF
FB
GND
10Ω
1µF
10Ω
C: X5R or X7R Dielectric
L: SUMIDA CDRH5D28R-220NC or Equivalent
Two transistors are recommended to use Dual Matched transistor pairs
This circuit can work in full temperature
Figure 20. Typical Application of Ten LED Drivers
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
5
0.300(0.012)
0.600(0.024)
4
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
0.200(0.008)
Pin 1 Dot by Marking
1
2
3
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.100(0.004)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
1.050(0.041) 1.050(0.041)
1.150(0.045) 1.250(0.049)
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
AP3030
Mechanical Dimensions
TSOT-23-6
2.800(0.110)
3.000(0.118)
1.500(0.059)
1.700(0.067)
Unit: mm(inch)
R0.100(0.004)
MIN
0°
8°
2.600(0.102)
3.000(0.118)
Pin 1 Dot by Marking
0.370(0.015)
MIN
0.950(0.037)
BSC
0.100(0.004)
0.250(0.010)
1.900(0.075)
BSC
0.250(0.010)
BSC
GAUGE
PLANE
0.700(0.028)
0.800(0.031)
0.700(0.030)
0.900(0.035)
0.000(0.000)
0.100(0.004)
0.350(0.014)
0.510(0.020)
Aug. 2008 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
12
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