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5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Data Sheet
General Description
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.
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.
Features
• 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
• Mobile Phone
• PDA
• MP3/4
QFN-3×3-16
Figure 1. Package Type of AP 3615
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Pin Configuration
FN Package
(QFN-3×3-16)
Note: Pin 14 should be connected with Pin 16 on PCB Board.
Pin 1 Mark
C1-
-
C
2
C2+
C1+
Figure 2. Pin Configuration of AP3615 (Top View)
VOUT1
1
2
3
49
5678
AGND
NC
EP
PGND
VOUT2
D1
13141516
EN
VIN
12
D2
11
D3
10
D4
D5
Exposed PAD,
Connected to AGND
Pin Description
Pin Number Pin Name Function
1 C1-
2 C2-
3 C2+
4 C1+
5 AGND Analog ground
6 PGND Power ground
7 VIN Supply voltage input
8 EN
9, 10, 11, 12,
13
14 VOUT2 Output pin 2. It powers 5 channels current sink
15 NC No connection
16 VOUT1
D5 ~ D1
Flying capacitor 1 negative terminal. The flying capacitor should be connected as close
to this pin as possible
Flying capacitor 2 negative terminal. The flying capacitor should be connected as close
to this pin as possible
Flying capacitor 2 positive terminal. The flying capacitor should be connected as close
to this pin as possible
Flying capacitor 1 positive terminal. The flying capacitor should be connected as close
to this pin as possible
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.
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
Output Pin 1. It’s the charge pump output. The output capacitor should be placed
closely to this pin
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Functional Block Diagram
C1- C1+ C2- C2+
14 32
VIN
EN
7
8
1x /1.5x Charge Pump
1MHz
OSC
Shutdown
Delay
16 Steps Pulse
Dimming Controller
Figure 3. Functional Block Diagram of AP3615
Current Limitation
Soft Start
UVLO
5 Channels Current Sink
OTSD
2D1 D3 D4
D
OVP
10111213
D5
16
9
14
5
6
VOUT1
AGND
PGND
VOUT2
Ordering Information
AP3615 -
Circuit Type G1: Green
Package
FN: QFN-3×3-16
TR: Tape and Reel
Package
QFN-3×3-16
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Temperature
Range
-40 to 85°C
Part Number Marking ID
AP3615FNTR-G1 B2B Tape & Reel
Packing
Type
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Input Voltage VIN -0.3 to 6 V
VOUT Pin Voltage (VOUT1 & VOUT2) V
EN Pin Voltage VEN -0.3 to 6 V
C1+, C2+ Pin Voltage VC+ -0.3 to 6 V
C1-, C2- Pin Voltage VC- -6 to 0.3 V
D1, D2, D3, D4 and D5 Pin Voltage VD V
Thermal Resistance
(Junction to Ambient, No Heat Sink, Free Air)
Operating Junction Temperature
Storage Temperature
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.
-6 to 0.3 V
OUT
to VIN V
OUT
60 ºC/W
150 ºC
-65 to 150 ºC
260 ºC
T
T
θ
JA
TJ
STG
LEAD
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Input Voltage VIN 2.8 5.5 V
Operating Ambient Temperature TA -40 85 ºC
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Electrical Characteristics
=3.6V, VEN=VIN, TA=25ºC, CIN=C1=C2=C
V
IN
Parameter Symbol Conditions Min Typ Max Unit
Input Section
Input Voltage VIN ID=0mA to 100mA 2.8 5.5 V
Under Voltage Lockout Threshold VIN Falling 2.2 V
Under Voltage Lockout Hysteresis 250 mV
Supply Current ICC No Load 1.7 3 mA
Shutdown Supply Current I
Charge Pump Section
Switch Frequency f
1x Mode to 1.5x Mode Transition
Voltage (V
Falling)
IN
1.5x Mode to 1x Mode Transition
Voltage (V
Rising)
IN
Current Source Section
WLED Current ID
Current Matching Between any
Two Outputs
Current Matching Between any
Two Outputs
Enable Section
EN High Level Threshold Voltage VIH 1.5 V
EN Low Level Threshold Voltage VIL 0.5 V
EN Input Current IEN VEN= 0V to 5V 1 10
EN Low to Shutdown Delay t
EN Low Time for Dimming tLO
EN High Time for Dimming tHI
VEN=GND 3 10
SHDN
VIN=3.0V, 1.5x Mode 0.7 1 1.3 MHz
OSC
V
1.5X
V
1X
VD1=VD2=VD3=VD4=VD5=3.2V -3 3 %
I
D-Match1
I
D-Match2
1 ms
SHDN
=1μF, VF(forward voltage)=3.2V, unless otherwise noted.
OUT
=3.2V,
V
D
I
D1=ID2=ID3=ID4=ID5
VD=3.2V,
I
D1=ID2=ID3=ID4=ID5
=20mA
=20mA
3.5 3.6 V
3.7 3.8 V
100% Setting,
3.0V≤VIN≤5.0V
=-40ºC to 85ºC
T
A
V
D1=VD2=VD3=VD4=VD5
to 4.0V
=3.0V
18.5 20 21.5 mA
-3.5 3.5 %
VIN=3.2V to 5.0V
0.1 0.3
0.1
μA
μA
ms
ms
Total Device
Soft-start Time tSS ID=100mA Total 200
Inrush Current I
Over Voltage Protection V
Thermal Shutdown T
Thermal Shutdown Hysteresis T
Thermal Resistance
(Junction to Case)
VIN=3.2V, ID=100mA Total 320 mA
INRUSH
Note 2 5.5 V
OVP
160 ºC
OTSD
20 ºC
HYS
θ
JC
QFN-3×3-16 15 ºC/W
μs
Note 2: Open circuit at any WLED that is programmed to be in the on state.
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Typical Performance Characteristics
=25ºC, CIN=C1=C2=C
T
A
=1μF, VF=3.2V, unless otherwise noted.
OUT
4.0
3.5
3.0
2.5
2.0
Shutdown Supply Current (μA)
1.5
1.0
-40 -20 0 20 40 60 80 100 120 140
Figure 4. Shutdown Supply Current vs. Temperature Figure 5. WLED Current vs. Input Voltage
Temperature (OC)
VIN=3.2V
Shut Down
22
21
20
19
18
WLED Current (mA)
TA=25oC
17
VIN Falling
16
2.83.23.64.04.44.85.25.6
I
I
I
I
I
Input Voltage (V)
D1
D2
D3
D4
D5
2.2
2.0
1.8
1.6
1.4
Quiescent Current (mA)
1.2
1.0
-40 -20 0 20 40 60 80 100 120 140
Temperature (OC)
TA=25oC
VIN=5V
No Load
1x Mode
Figure 6. 1x Mode Quiescent Current vs. Temperature
4.4
4.0
3.6
3.2
2.8
Quiescent Current (mA)
2.4
2.0
-40 -20 0 20 40 60 80 100 120 140
Temperature (OC)
TA=25oC
VIN=3.2V
No Load
1.5x Mode
Figure 7. 1.5x Mode Quiescent Current
vs. Temperature
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=C
=1μF, VF=3.2V, unless otherwise noted.
OUT
22
TA=25oC
21
VIN=5V
22
TA=25oC
21
VIN =3.6V
20
20
19
18
WLED Current (mA)
17
16
-40 -20 0 20 40 60 80 100 120 140
Temperature (OC)
I
I
I
I
I
D1
D2
D3
D4
D5
19
18
WLED Current (mA)
17
16
-40 -20 0 20 40 60 80 100 120 140
Figure 8. 1x Mode WLED Current vs. Temperature Figure 9. 1.5x Mode WLED Current vs.
100
90
80
70
60
50
Efficiency (%)
40
30
20
10
2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
TA=25oC
V
from High to Low
IN
ID1=ID2=ID3=ID4=ID5=20mA
Input Voltage (V)
1.4
1.2
1.0
0.8
Frequency (MHz)
0.6
0.4
-40 -20 0 20 40 60 80 100 120 140
Figure 10. Efficiency vs. Input Voltage Figure 11. Frequency vs. Temperature
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Temperature (OC)
Temperature
VIN=3.6V
ID1=ID2=ID3=ID4=ID5=20mA
Temperature (oC)
I
I
I
I
I
D1
D2
D3
D4
D5
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=C
2.2
2.0
1.8
1.6
1.4
Quiescent Current (mA)
1.2
1.0
2.02.53.03.54.04.55.05.5
Figure 12. 1x Mode Quiescent Current vs. Figure 13. UVLO Threshold Voltage vs. Temperature
Input Voltage
=1μF, VF=3.2V, unless otherwise noted.
OUT
TA=25oC
No Load
VIN Rising
Input Voltage (V)
2.6
2.5
2.4
2.3
2.2
2.1
UVLO Threshold Vol tage (V)
2.0
1.9
-40 -20 0 20 40 60 80 100 120 140
Power Falling
Power Rising
TA=25oC
No Load
Temperature (oC)
V
C1+
2V/div
V
OUT
1V/div
V
EN
2V/div
I
IN
0.2A/div
Time (100μs/div) Time (400μs/div)
Figure 14. 1x Mode Turn on Characteristic Figure 15. 1x Mode Turn off Characteristic
V
2V/div
V
1V/div
2V/div
0.2A/div
OUT
V
C1+
EN
I
IN
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Typical Performance Characteristics (Continued)
TA=25ºC, CIN=C1=C2=C
V
C1+
2V/div
1V/div
2V/div
0.2A/div
V
OUT
V
EN
I
IN
Figure 16. 1.5x Mode Turn on Characteristic Figure 17. 1.5x Mode Turn off Characteristic
=1μF, VF=3.2V, unless otherwise noted.
OUT
V
C1+
2V/div
V
OUT
1V/div
V
EN
2V/div
I
IN
0.2A/div
Time (100μs/div)
Time (400μs/div)
VEN
2V/div
I
WLED
5mA/div
V
20mV/div
I
20mA/div
V
OUT
50mV/div
V
C1+
2V/div
IN
IN
Time (2ms/div)
Time (400ns/div)
Figure 18. 1x Mode Dimming Operation Figure 19. Output Ripple (VIN=3.3V, ID=100mA)
(VIN=5V, fEN=2kHz)
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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 T
will decrease 1/16. If the low level duration time is larger than T
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.
LOmin
and T
, and the high level duration time is larger than T
LOmax
SHDNmax,
the IC will be turned off. When AP3615
, the LED current
HImin
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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.
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Data Sheet
5 CHANNEL CHARGE PUMP CURRENT SINK FOR LED DRIVER AP3615
Mechanical Dimensions
QFN-3×3-16 Unit: mm(inch)
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BCD Semiconductor Manufacturing Limited
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IMPORTANT NOTICE
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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
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