BCDSEMI AP3008_06

Preliminary Datasheet
WHITE LED DRIVER
AP3008
General Description
Features
The AP3008 is a 1.2MHz PWM boost switching regulator designed for constant-current white LED driver
applications.
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The AP3008 can drive a string of 2 to 3 white LEDs
from a 2.7V supply in series, ensuring uniform brightness and eliminating several ballast resistors. The
AP3008 implements a constant frequency 1.2MHz
PWM control scheme. The high frequency PWM operation also saves board space by reducing external component sizes. To improve efficiency, the feedback
voltage is set to 95 mV, which reduces the power
dissipation in the current setting resistor.
Inherently Uniform LED Current
High Efficiency up to 84%
Drives 2 to 3 LEDs from a 2.7V Supply
1.2MHz PWM Operation Frequency
Requires Only 0.22µF Output Capacitor
Shutdown Current: < 1µA
Built-in Output Over-Voltage Protection
Under Voltage Lock Out (UVLO)
Applications
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The AP3008 is equipped with OVP protection ability,
the SW pin monitors the output voltage and will turn
off the device if an over-voltage condition is present to
prevent damage from an open circuit condition.
Digital Cameras
LCD modules
GPS Receivers
Cellular Phones
PDAs, Handheld Computers
The AP3008 is available in SOT-23-5L package.
SOT-23-5L
Figure 1. Package Type of AP3008
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Pin Configuration
K Package
(SOT-23-5L)
SW
1
GND
2
FB
3
5
VIN
4
SHDN
Figure 2. Pin Configuration of AP3008 (Top View)
Pin Description
Pin Number
Pin Name
1
SW
2
GND
3
FB
4
SHDN
5
VIN
Function
Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not
extend this limit. If the voltage on this pin is higher than the overvoltage protection threshold (OVP), the device comes back to shutdown mode. To restart the chip, one must then
send a low to high sequence on shutdown pin or switch off the VIN supply.
Ground Pin.
Voltage Feedback. Reference voltage is 95mV.
Shutdown Pin. Connect to 1.5V or higher to enable device;
Connect to 0.4V or less to disable device.
Input Supply Pin. Must be locally bypassed.
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Functional Block Diagram
1
OVP
FB
VIN
SW
3
5
VREF
1.25V
DRIVER
A1
95mV
Q
R
A2
Q1
S
COMPARATOR
Σ
SHDN
4
2
GND
SHUTDOWN
RAMP
GENERATOR
1.2MHz
OSCILLATOR
Figure 3. Functional Block Diagram of AP3008
Ordering Information
AP3008
-
Circuit Type
E1: Lead Free
Blank: Tin Lead
Package
TR: Tape and Reel
Blank: Tube
K: SOT-23-5L
Part Number
Marking ID
Package
Temperature
Range
Tin Lead
Lead Free
Tin Lead
Lead Free
Packing
Type
SOT-23-5L
-40 to 85oC
AP3008KTR
AP3008KTR-E1
K1B
E1B
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
15
V
SW Voltage
36
V
FB Voltage
10
V
SHDN Voltage
15
V
265
oC/W
150
oC
TSTG
-65 to 150
oC
TLEAD
260
oC
ESD (Machine Model)
250
V
ESD (Human Body Model)
2000
V
Thermal Resistance (Junction to Atmosphere, no Heat sink)
RθJA
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
Operating Temperature Range
Symbol
Min
Max
Unit
TOP
-40
85
oC
2.5
12
V
Operating Voltage Range
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Electrical Characteristics
(VIN=3V, VSHDN=3V, TA=25oC, unless otherwise specified.)
Parameter
Feedback Voltage
Symbol
VFB
Conditions
ISW=100mA, Duty Cycle=66%
Min
Typ
Max
Unit
86
95
104
mV
45
100
nA
FB Pin Bias Current
Supply Current
ICC
VSHDN=VIN, VFB=VIN, No switching
1.9
2.5
mA
Supply Current
IQ
VSHDN=0V
0.1
1.0
µA
Switch Frequency
f
0.8
1.2
1.6
MHz
Maximum Duty Cycle
DMAX
85
90
%
Switch Current Limit
ILIM
Duty=15%
320
mA
ISW=250mA
350
mV
VSW=5V
0.01
Switch VCESAT
VCESAT
Switch Leakage Current
SHDN Voltage
VTH
High
VTL
Low
µA
1.5
0.4
SHDN Pin Bias Current
OVP Voltage
5
VOVP
Jul. 2006 Rev. 1. 3
V
50
µA
29
V
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
WHITE LED DRIVER
AP3008
Typical Performance Characteristics
2.8
320
2.6
SHDN Pin Bias Current (µA)
2.4
2.2
2.0
IQ (mA)
1.8
o
-50 C
o
25 C
o
100 C
1.6
1.4
1.2
1.0
0.8
0.6
VSHDN=10V
VSHDN=3.6V
VSHDN=3V
VSHDN=2.7V
280
240
200
160
120
80
0.4
40
0.2
0.0
0
2
4
6
8
-50
10
-25
0
25
50
75
100
o
Junction Temperature ( C)
VIN (V)
Figure 4. Quiescent Current vs. VIN
Figure 5. SHDN Pin Bias Current
vs. Junction Temperature
55
1.4
50
45
Feedback Bias Current (nA)
Switch Frequency (MHz)
1.2
1.0
0.8
0.6
0.4
40
35
30
25
20
15
10
0.2
5
0.0
-50
-25
0
25
50
75
0
-50
100
o
-25
0
25
50
75
100
o
Junction Temperature ( C)
Junction Temperature ( C)
Figure 6. Switch Frequency
vs. Junction Temperature
Figure 7. Feedback Bias Current
vs. Junction Temperature
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Typical Performance Characteristics (Continued)
440
400
84
ILED=20mA
360
Current Limit (mA)
Efficiency (%)
320
82
ILED=15mA
80
ILED=10mA
VIN=3.6V
3 LEDs
280
240
200
160
120
80
40
78
-50
-25
0
25
50
75
0
100
0
20
40
60
80
100
o
Junction Temperature ( C)
Duty Cycle (%)
Figure 8. Efficiency vs. Junction Temperature
Figure 9. Switch Current vs. Duty Cycle
85
85
3 LEDs
o
VLED=3.35V, TA=25 C
VIN=3V
75
4 LEDs
o
VLED=3.35V, TA=25 C
80
Efficiency (%)
Efficiency (%)
80
VIN=3.6V
70
VIN=3V
75
VIN=3.6V
70
65
65
60
60
0
5
10
15
0
20
5
10
15
20
LED Current (mA)
LED Current (mA)
Figure 10. Efficiency vs. LED Current
Figure 11. Efficiency vs. LED Current
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Typical Application
VIN
L1
22µΗ
3V to 5V
D1
LED 1
LED 2
OFF
VIN
ON
SHDN
SW
AP3008
GND
C1
1µF
LED 3
FB
C2
0.22µF
R1
6.34Ω
C1, C2: X5R or X7R Dielectric
L1: SUMIDA CDRH5D28R-220NC or Equivalent
Figure 12. Three White LEDs Driver
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
WHITE LED DRIVER
AP3008
Mechanical Dimensions
SOT-23-5L
Unit: mm(inch)
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
0.100(0.004)
0.200(0.008)
2.950(0.116)
2.650(0.104)
2.820(0.111)
3.020(0.119)
0.200(0.008)
0.700(0.028)
REF
0.300(0.012)
0.400(0.016)
0°
8°
1.800(0.071)
2.000(0.079)
1.250(0.049)
1.050(0.041)
0.950(0.037)
TYP
0.000(0.000)
0.100(0.004)
1.050(0.041)
1.150(0.045)
Jul. 2006 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
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