PRODUCT DATASHEET
AAT3104178
ChargePump
TM
Typical Characteristics
V
IN
= 3.6V, C
IN
= C
OUT
= C1 = 1μF; T
A
= 25°C, unless otherwise noted.
Low Cost 1x/2x 4 Channel Charge Pump WLED Driver
Current Matching vs. Temperature
(AAT3104-2; Code = 1)
33.0
32.5
90
Efficiency vs. Input Voltage
(I
LED
= 31mAx4; Voltage Sweep Upwards)
D1
D2
D3
D4
V
F
= 2.7V
V
F
= 3.0V
V
F
= 3.3V
V
F
= 3.6V
80
Efficiency (%)
85
Current (mA)
32.0
31.5
31.0
30.5
30.0
29.5
29.0
-40
-15
10
35
60
70
60
50
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Temperature (°C)
Input Voltage (V)
Efficiency vs. Input Voltage
(I
LED
= 31mAx4; Voltage Sweep Downwards)
90
6.5
Quiescent Current vs. Input Voltage
Quiescent Current (mA)
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
80
Efficiency (%)
70
60
50
40
30
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
V
F
= 2.7V
V
F
= 3.0V
V
F
= 3.3V
V
F
= 3.6V
85°C
25°C
-40°C
5.5
Input Voltage (V)
Input Voltage (V)
Shutdown Current vs. Temperature
25
850
Frequency vs. Temperature
ShutdownnCurrent (nA)
Frequency (KHz)
-40
-15
10
35
60
85
20
V
IN
= 5.5V
V
IN
= 2.7V
840
830
820
810
800
790
780
770
760
15
10
5
0
750
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
6
www.analogictech.com
3104.2008.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
