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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
General Description
Features
The AP3605 is a step-up DC/DC converter based on
1.5x charge pump current source, it is specially
designed for LED supplies in backlight display.
·
·
·
·
·
·
·
·
The AP3605 can provide constant current up to 20mA
for each LED, which is programmed by an external
resistor, so it has a total capability to provide 80mA for
4 LEDs. The chip has a good performance of LED
current matching and allows PWM brightness dimming control. Additionally, high switching frequency
up to 1MHz enables the use of two small external
flying capacitors. Internal soft-start circuitry prevents
excessive inrush current during start-up.
·
·
·
The AP3605 supply voltage range is from 2.7V to
5.5V, ideally suited for applications powered by the Liion battery.
Regulated Output Current with ±3% Matching
Regulated ±10% Output Current Source
Drive up to 4 LEDs at 20mA Each
Wide Operating Voltage Range: 2.7V to 5.5V
High Efficiency up to 93%
High Operating Frequency: 1MHz
Built-in Soft-Start to Limit the Inrush Current
LED Brightness Control through PWM and Analog Signal
PWM Dimming Frequency up to 50kHz
Built-in Standby Mode to Get PWM Dimming
Duty Cycle Control Linearity
Built-in OTSD (Over Temperature Shutdown)
Function to Protect the Device from Burn Out
Applications
The AP3605 is available in a 3mmx3mm QFN-3x3-16
tiny package. Its operating temperature range is -40oC
·
·
·
to 85oC.
Mobile Phone
MP3, MP4
White LED Backlight in Mobile Phone, PDA
QFN-3x3-16
Figure 1. Package Type of AP3605
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Pin Configuration
FN Package
(QFN-3x3-16)
Pin 1 Mark D3 D2
16
15
D1 VIN2
14
13
D4
1
12
EN
VOUT1
2
11
ISET
PGND
3
10
AGND
C2-
4
EP
9
5
6
7
C1+
8
VIN1 C1- C2+ VOUT2
Exposed PAD, Connected to AGND
Note: Pin 2 should be connected with Pin 8 and Pin 5 should be connected with Pin 13 on PCB board.
Figure 2. Pin Configuration of AP3605 (Top View)
Pin Description
Pin Number
Pin Name
1, 16, 15, 14
D4 to D1
2, 8
VOUT1, VOUT2
3
PGND
4
C2-
5, 13
VIN1, VIN2
6
C1-
7
C2+
9
C1+
10
AGND
11
ISET
12
EN
Function
Current Source Output. Connect the anode of the white LEDs to these outputs
Output Pin 1 and 2, must be connected together. The output capacitor should be placed
closely to these pins
Power Ground. Connect this pin with power ground plane
Flying Capacitor 2 Negative Terminal. The flying capacitor 2 should be connected as close
to this pin as possible
Supply Voltage Input 1 and 2, must be connected together
Flying Capacitor 1 Negative Terminal. The flying capacitor 1 should be connected as close
to this pin as possible
Flying Capacitor 2 Positive Terminal. The flying capacitor 2 should be connected as close to
this pin as possible
Flying Capacitor 1 Positive Terminal. The flying capacitor 1 should be connected as close to
this pin as possible
Analog Ground. Connect this pin with control signal ground plane. PGND, AGND and the
exposed PAD should be connected together
Current Source Set Pin. Connect a resistor between this pin and GND to set the maximum
LED current
Enable Control Input. Logic high enables the IC; while logic low forces the device into shutdown mode to reduce the supply current to less than 1μA. Add a PWM signal to this pin to
achieve brightness control
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Functional Block Diagram
C2- C2+
4
7
C1-
C1+ VOUT2 VOUT1
6
9
2
8
14
VIN1
5
LDO
15
1.5x Charge Pump
4-Channel
Current
Source
+
Error
AMP _
VIN2
13
Voltage
Reference
Soft
Start
1MHz
OSC
OTSD
Standby
16
1
11
12
3
D1
D2
D3
D4
ISET
EN
10
AGND
PGND
Figure 3. Functional Block Diagram of AP3605
Ordering Information
AP3605
-
Circuit Type
E1: RoHS
Package
TR: Tape and Reel
FN: QFN-3x3-16
Package
Temperature Range
Part Number
QFN-3x3-16
-40 to 85oC
AP3605FNTR-E1 (Note 1)
Marking ID
F1A
Packing Type
Tape & Reel
Note 1: AP3605FNTR-E1 is a green product.
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Absolute Maximum Ratings (Note 2)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
-0.3 to 6
V
EN Pin Voltage
VEN
-0.3 to 6
V
VOUT1 Pin Voltage
VOUT1
-0.3 to 6
V
VOUT2 Pin Voltage
VOUT2
-0.3 to 6
V
ISET Pin Voltage
VISET
-0.3 to 6
V
Output Current at VOUT2 Pin
IOUT2
150
mA
Thermal Resistance (Junction to Ambient, no Heat sink)
RθJA
60
TJ
150
TSTG
-65 to 150
oC
TLEAD
260
oC
2000
V
Operating Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10sec)
ESD (Human Body Model)
o
C/W
o
C
Note 2: 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
2.7
5.5
V
Operating Temperature
TA
-40
85
o
RISET
1.44
Current Source Set Resistor
Jan. 2013 Rev. 1. 8
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Electrical Characteristics
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. )
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
5.5
V
Input Section
Input Voltage
VIN
ID=0 to 40 mA
Supply Current
ICC
No Load, ISET floating
1.5
2.5
mA
VEN=GND
0.1
1
μA
1
1.35
MHz
Shutdown Supply Current
ISHDN
2.7
Charge Pump Section
Switching Frequency
Efficiency
fOSC
η
0.65
VIN=3.5V, ID=40mA Total
93
%
Current Source Section
Maximum Output Current per
Source
IDX
3.2V≤VIN≤5.5V,
22
mA
-3
3
%
3.5V≤VIN≤5.5V
-2
2
%/V
3.0V≤VD≤4.0V, VIN=3.5V
-5
5
%
V
TA=-40oC to 85oC
Current Matching between Any I
D-MATCH
Two Outputs
Output Current Line Regulation
(ΔID/ID)/
ΔV
18
20
Current Matching between Any
Two Outputs under Different LED
Forward Voltage
ΔID/ID
Reference Voltage for Current Set
VISET
1.193
1.23
1.267
K
100
120
140
EN High Level Threshold Voltage
VIH
1.4
EN Low Level Threshold Voltage
VIL
EN Input Leakage Current
IEN
EN Low Threshold Time for
Standby State
tSTB
ID to ISET Current Ratio
Enable Section
VEN=5.5V
V
-1
0.5
V
1
μA
2
ms
400
μs
Total Device
Soft-Start Time
tSS
ID=80mA Total
Thermal Shutdown
TOTSD
160
oC
Thermal Shutdown Hysteresis
THYS
20
oC
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Performance Characteristics
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.)
1.6
1.25
VIN=3.5V, No Load, RISET Open
1.20
1.4
Supply Current (mA)
Supply Current (mA)
1.5
1.30
1.3
1.2
1.1
1.0
0.9
-50
1.15
1.10
1.05
1.00
0.95
-25
0
25
50
75
100
125
0.90
2.5
150
RISET Open
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
O
Junction Temperature ( C)
Figure 4. Supply Current vs. Junction Temperature
Figure 5. Supply Current vs. Input Voltage
1.25
1.250
1.20
1.245
1.15
1.240
1.05
VISET (V)
Frequency (MHz)
1.10
1.00
0.95
1.235
1.230
1.225
0.90
1.220
0.85
0.75
-50
1.215
VIN=3.5V
0.80
-25
0
25
50
75
100
125
1.210
-50
150
-25
0
25
50
75
100
125
150
O
O
Junction Temperature ( C)
Junction Temperature ( C)
Figure 6. Frequency vs. Junction Temperature
Figure 7. Reference Voltage vs. Junction Temperature
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Performance Characteristics (Continued)
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.)
5.1
1.10
1.05
5.0
1.00
Output Voltage (V)
VIH and VIL (V)
0.95
0.90
0.85
0.80
0.75
0.70
VIH
VIL
0.65
0.60
2.5
3.0
3.5
4.0
4.5
5.0
4.9
4.8
4.7
4.6
4.5
5.5
0
20
Input Voltage (V)
80
100
120
Figure 9. Output Voltage vs. Output Current
80
80
ID=20mA
ID=40mA
70
ID=60mA
ID=80mA
ID=20mA
ID=40mA
70
ID=60mA
ID=80mA
60
IDIODE (mA)
60
IDIODE (mA)
60
Output Current (mA)
Figure 8. VIH and VIL vs. Input Voltage
50
40
50
40
30
30
20
20
2.5
40
3.0
3.5
4.0
4.5
5.0
3.0
5.5
3.2
3.4
3.6
3.8
4.0
VDIODE (V)
Input Voltage (V)
Figure 10. IDIODE vs. Input Voltage
Figure 11. IDIODE vs. VDIODE
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Performance Characteristics (Continued)
100
100
95
95
90
90
85
85
80
80
Efficiency (%)
Efficiency (%)
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.)
75
70
65
75
70
65
60
60
55
55
50
0
20
40
60
80
100
IOUT=20mA
IOUT=40mA
IOUT=60mA
IOUT=80mA
IOUT=100mA
IOUT=120mA
50
2.5
120
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Output Current (mA)
Figure 12. Efficiency vs. Output Current
Figure 13. Efficiency vs. Input Voltage
VEN
VEN
VOUT
VD
VOUT
VD
IIN
IIN
Figure 14. Turn on Characteristic
Figure 15. Turn off Characteristic
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Performance Characteristics (Continued)
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. VOUT is the output voltage when VOUT1 and VOUT2 are connected.)
VIN
VIN
VOUT
VOUT
ID
ID
VD
VD
Figure 16. Output Ripple @ ID=40mA
Figure 17. Output Ripple @ ID=80mA
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Operation
The AP3605 is a high efficiency 1.5x fractional
charge pump with 4 channels of integrated current
source for white LED backlight applications. The
AP3605 consists of a linear regulator followed by a
1.5x charge pump which operates at 1MHz, 4
channels current source, a reference and other control
circuits. The linear regulator regulates its output
voltage to supply charge pump, guarantees that the
charge pump always operates at 5V output with 1.5x
mode. This configuration minimizes the output
ripple.
up to 20mA of current. The maximum LED current is
set by a resistor connected to the ISET pin which
programs a reference current, then the reference
current is mirrored to set the LED current.
Applying a PWM signal to the EN pin can be used to
achieve LED brightness dimming. Integrated 2ms
standby function helps to enhance the dimming control. Detailed descriptions please see the related
application note.
The charge pump can generate 80mA of output
current, so each of the 4 WLED can be powered with
Typical Application
EN
PWM Dimming
1kHz to 50kHz
Li-ion
Battery
CIN
COUT
1μF
1μF
C1 1μF
C2 1μF
C1+ C1-
C2+ C2-
EN
D1
VIN
D2
AP3605
V OUT1
D3
V OUT2
D4
ISET
GND
RISET
Figure 18. AP3605 Typical Application Circuit with 4 WLEDs
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Application (Continued)
EN
Li-ion
Battery
PWM Dimming
1kHz to 50kHz
CIN
COUT
1μF
1μF
C1 1μF
C2 1μF
C1+ C1-
C2+ C2-
EN
D1
VIN
D2
AP3605
VOUT1
D3
VOUT2
D4
ISET
GND
RISET
Figure 19. AP3605 Typical Application Circuit with 3 WLEDs
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Mechanical Dimensions
Unit: mm(inch)
QFN-3x3-16
2.900(0.114)
3.100(0.122)
Pin 1 Mark
PIN # 1 IDENTIFICATION
See DETAIL A
N1
0.300(0.012)
0.500(0.020)
2.900(0.114)
3.100(0.122)
0.180(0.007)
0.280(0.011)
0.500(0.020)
BSC
1.700(0.067)
REF
Exposed
Pad
1.700(0.067)
REF
DETAIL A
1
0.700(0.028)
0.900(0.035)
0.178(0.007)
0.228(0.009)
2
1
1
2
16
16
16
15
15
15
2
0.000(0.000)
0.050(0.002)
Pin 1 Options
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