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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
General Description
Features
The AP3615 is a step-up DC-DC converter based on
1x/1.5x charge pump and low dropout current sink,
which helps it maintain the highest efficiency. The
AP3615 is specially designed to drive up to 5
WLEDs in backlight display.
•
•
•
•
•
•
•
•
•
•
•
The AP3615 provides up to 20mA current for each
WLED. There are totally 16 steps of current control,
which is achieved through a digital pulse dimming
function on EN pin. Additionally, 1MHz high
switching frequency enables the use of small external
capacitors. Internal soft-start circuitry prevents
excessive inrush current during start-up and mode
transition.
AP3615
Regulated Output Current with ±3% Matching
Drives up to 5 WLEDs at 20mA Each
16 Steps Brightness Control Using Pulse Signal
Dimming
Wide Operating Voltage Range: 2.8V to 5.5V
High Operating Frequency: 1MHz
Auto 1x/1.5x Charge Pump Mode Selection
Built-in Soft-start
Output Over Voltage Protection
Built-in UVLO
Built-in OTSD
Operating Temperature Range: -40°C to 85°C
Applications
The supply voltage of AP3615 ranges from 2.8V to
5.5V which make it ideally suit for applications
powered by Li-ion battery.
•
•
•
The AP3615 is available in the tiny package of
QFN-3×3-16.
Mobile Phone
PDA
MP3/4
QFN-3×3-16
Figure 1. Package Type of AP3615
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
1
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Pin Configuration
VOUT2
D1
16
NC
Pin 1 Mark
VOUT1
FN Package
(QFN-3×3-16)
15
14
13
C1-
1
12
D2
C2-
2
11
D3
C2+
3
10
D4
C1+
4
9
D5
5
6
7
8
AGND
PGND
VIN
EN
EP
Exposed PAD,
Connected to AGND
Note: Pin 14 should be connected with Pin 16 on PCB Board.
Figure 2. Pin Configuration of AP3615 (Top View)
Pin Description
Pin Number
Pin Name
Function
1
C1-
Flying capacitor 1 negative terminal. The flying capacitor should be connected as close
to this pin as possible
2
C2-
Flying capacitor 2 negative terminal. The flying capacitor should be connected as close
to this pin as possible
3
C2+
Flying capacitor 2 positive terminal. The flying capacitor should be connected as close
to this pin as possible
4
C1+
Flying capacitor 1 positive terminal. The flying capacitor should be connected as close
to this pin as possible
5
AGND
Analog ground
6
PGND
Power ground
7
VIN
Supply voltage input
8
EN
Enable control input. Logic high enables the IC; while logic low forces the IC into
shutdown mode. It is used for digital dimming by applying a pulse signal on it.
9, 10, 11, 12,
13
D5 ~ D1
Current sink for WLED5, 4, 3, 2, 1. Connect the cathode of WLEDs to these pins. If
not used, these pins must be connected with VIN
14
VOUT2
Output pin 2. It powers 5 channels current sink
15
NC
16
Jan. 2013
VOUT1
No connection
Output Pin 1. It’s the charge pump output. The output capacitor should be placed
closely to this pin
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
2
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Functional Block Diagram
VIN
C1-
C1+
1
4
7
EN
C2+
2
3
16
1x /1.5x Charge Pump
AGND
6
PGND
14
VOUT2
OVP
Soft Start
Shutdown
Delay
UVLO
16 Steps Pulse
Dimming Controller
VOUT1
5
Current Limitation
1MHz
OSC
8
C2-
OTSD
5 Channels Current Sink
13
12
11
10
9
D1 D2 D3 D4 D5
Figure 3. Functional Block Diagram of AP3615
Ordering Information
AP3615
-
Circuit Type
G1: Green
TR: Tape and Reel
Package
FN: QFN-3×3-16
Package
Temperature
Range
QFN-3×3-16
-40 to 85°C
Part Number
AP3615FNTR-G1
Marking ID
B2B
Packing
Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
3
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Absolute Maximum Ratings (Note 1)
Parameter
Input Voltage
VOUT Pin Voltage (VOUT1 & VOUT2)
EN Pin Voltage
C1+, C2+ Pin Voltage
C1-, C2- Pin Voltage
D1, D2, D3, D4 and D5 Pin Voltage
Thermal Resistance
(Junction to Ambient, No Heat Sink, Free Air)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
Symbol
Value
Unit
VIN
VOUT
VEN
VC+
VCVD
-0.3 to 6
-6 to 0.3
-0.3 to 6
-0.3 to 6
-6 to 0.3
VOUT to VIN
V
V
V
V
V
V
θJA
60
ºC/W
TJ
TSTG
TLEAD
150
-65 to 150
260
ºC
ºC
ºC
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
Unit
Input Voltage
VIN
2.8
5.5
V
Operating Ambient Temperature
TA
-40
85
ºC
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
4
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Electrical Characteristics
VIN=3.6V, VEN=VIN, TA=25ºC, CIN=C1=C2=COUT=1μF, VF(forward voltage)=3.2V, unless otherwise noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
5.5
V
Input Section
Input Voltage
VIN
Under Voltage Lockout Threshold
ID=0mA to 100mA
2.8
VIN Falling
Under Voltage Lockout Hysteresis
Supply Current
Shutdown Supply Current
ICC
No Load
ISHDN
VEN=GND
fOSC
VIN=3.0V, 1.5x Mode
2.2
V
250
mV
1.7
3
mA
3
10
μA
1
1.3
MHz
3.5
3.6
V
3.7
3.8
V
20
21.5
mA
Charge Pump Section
Switch Frequency
1x Mode to 1.5x Mode Transition
Voltage (VIN Falling)
1.5x Mode to 1x Mode Transition
Voltage (VIN Rising)
V1.5X
V1X
0.7
VD=3.2V,
ID1=ID2=ID3=ID4=ID5=20mA
VD=3.2V,
ID1=ID2=ID3=ID4=ID5=20mA
Current Source Section
WLED Current
ID
100% Setting,
3.0V≤VIN≤5.0V
TA=-40ºC to 85ºC
18.5
Current Matching Between any
Two Outputs
ID-Match1
VD1=VD2=VD3=VD4=VD5=3.2V
-3
3
%
Current Matching Between any
Two Outputs
ID-Match2
VD1=VD2=VD3=VD4=VD5=3.0V
to 4.0V
VIN=3.2V to 5.0V
-3.5
3.5
%
Enable Section
EN High Level Threshold Voltage
VIH
EN Low Level Threshold Voltage
VIL
EN Input Current
IEN
1.5
VEN= 0V to 5V
V
1
EN Low to Shutdown Delay
tSHDN
1
EN Low Time for Dimming
tLO
0.1
EN High Time for Dimming
tHI
0.1
0.5
V
10
μA
ms
0.3
ms
ms
Total Device
Soft-start Time
tSS
Inrush Current
IINRUSH
ID=100mA Total
200
μs
VIN=3.2V, ID=100mA Total
320
mA
Note 2
5.5
V
Over Voltage Protection
VOVP
Thermal Shutdown
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
Thermal Resistance
(Junction to Case)
θJC
15
ºC/W
QFN-3×3-16
Note 2: Open circuit at any WLED that is programmed to be in the on state.
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Typical Performance Characteristics
4.0
22
3.5
21
WLED Current (mA)
Shutdown Supply Current (μA)
TA=25ºC, CIN=C1=C2=COUT=1μF, VF=3.2V, unless otherwise noted.
3.0
2.5
2.0
20
19
ID1
ID2
18
ID3
o
1.0
-40
TA=25 C
VIN=3.2V
1.5
17
Shut Down
-20
0
20
40
60
80
100
120
16
2.8
140
ID4
VIN Falling
3.2
ID5
3.6
4.0
4.4
4.8
5.2
5.6
Temperature ( C)
Input Voltage (V)
Figure 4. Shutdown Supply Current vs. Temperature
Figure 5. WLED Current vs. Input Voltage
2.2
4.4
2.0
4.0
Quiescent Current (mA)
Quiescent Current (mA)
O
1.8
1.6
o
TA=25 C
1.4
VIN=5V
No Load
1x Mode
1.2
1.0
-40
-20
0
20
40
60
80
100
120
3.2
o
TA=25 C
2.8
VIN=3.2V
No Load
1.5x Mode
2.4
2.0
-40
140
O
Temperature ( C)
-20
0
20
40
60
80
100
120
140
O
Temperature ( C)
Figure 7. 1.5x Mode Quiescent Current
vs. Temperature
Figure 6. 1x Mode Quiescent Current vs. Temperature
Jan. 2013
3.6
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
6
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=COUT=1μF, VF=3.2V, unless otherwise noted.
22
22
o
o
TA=25 C
TA=25 C
21
VIN=5V
WLED Current (mA)
WLED Current (mA)
21
20
19
ID1
ID2
18
VIN =3.6V
20
19
ID1
ID2
18
ID3
ID3
ID4
17
ID4
17
ID5
ID5
16
-40
-20
0
20
40
60
80
100
120
16
-40
140
-20
0
20
40
60
80
100
120
140
O
Temperature ( C)
O
Temperature ( C)
Figure 8. 1x Mode WLED Current vs. Temperature
Figure 9. 1.5x Mode WLED Current vs.
Temperature
100
1.4
90
1.2
Frequency (MHz)
Efficiency (%)
80
70
60
50
40
VIN from High to Low
VIN=3.6V
0.6
ID1=ID2=ID3=ID4=ID5=20mA
20
3.2
3.6
4.0
4.4
4.8
5.2
ID1=ID2=ID3=ID4=ID5=20mA
0.4
-40
5.6
-20
0
20
40
60
80
100
120
140
o
Input Voltage (V)
Temperature ( C)
Figure 10. Efficiency vs. Input Voltage
Jan. 2013
0.8
o
TA=25 C
30
10
2.8
1.0
Figure 11. Frequency vs. Temperature
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
7
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=COUT=1μF, VF=3.2V, unless otherwise noted.
2.6
UVLO Threshold Voltage (V)
2.2
Quiescent Current (mA)
2.0
1.8
1.6
1.4
o
TA=25 C
No Load
VIN Rising
1.2
1.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Power Falling
Power Rising
2.5
2.4
2.3
2.2
2.1
o
TA=25 C
2.0
1.9
-40
5.5
No Load
-20
0
20
40
60
80
100
120
140
o
Temperature ( C)
Input Voltage (V)
Figure 12. 1x Mode Quiescent Current vs.
Input Voltage
Figure 13. UVLO Threshold Voltage vs. Temperature
VC1+
2V/div
VC1+
2V/div
VOUT
1V/div
VOUT
1V/div
VEN
2V/div
VEN
2V/div
IIN
0.2A/div
IIN
0.2A/div
Time (100μs/div)
Time (400μs/div)
Figure 14. 1x Mode Turn on Characteristic
Jan. 2013
Figure 15. 1x Mode Turn off Characteristic
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
8
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=COUT=1μF, VF=3.2V, unless otherwise noted.
VC1+
2V/div
VC1+
2V/div
VOUT
1V/div
VOUT
1V/div
VEN
2V/div
VEN
2V/div
IIN
0.2A/div
IIN
0.2A/div
Time (400μs/div)
Time (100μs/div)
Figure 16. 1.5x Mode Turn on Characteristic
Figure 17. 1.5x Mode Turn off Characteristic
VIN
20mV/div
IIN
20mA/div
VOUT
50mV/div
VC1+
2V/div
VEN
2V/div
IWLED
5mA/div
Time (400ns/div)
Time (2ms/div)
Figure 18. 1x Mode Dimming Operation
(VIN=5V, fEN=2kHz)
Jan. 2013
Figure 19. Output Ripple (VIN=3.3V, ID=100mA)
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
9
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Digital Dimming Operating Diagram
Figure 20. Digital Dimming Operating Diagram of AP3615
Note 3: The dimming control can be achieved by applying a pulse to the EN pin. When the low level duration
time of pulse is between TLOmin and TLOmax, and the high level duration time is larger than THImin, the LED current
will decrease 1/16. If the low level duration time is larger than TSHDNmax, the IC will be turned off. When AP3615
is powered on, the WLED is in full brightness. And it will keep maximum current until the pulse is detected.
After 15 pulses the WLED current decreases to 1/16 of full brightness. It will increase to full brightness if a
pulse is added to EN pin then.
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
10
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Typical Application
4 WLEDs
5 WLEDs
Figure 21. Typical Applications of AP3615
Detailed application information, please refer to AP3615 application note.
Jan. 2013
Rev. 1. 3
BCD Semiconductor Manufacturing Limited
11
Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER
AP3615
Mechanical Dimensions
QFN-3×3-16
Jan. 2013
Rev. 1. 3
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
12
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