AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
Typical Characteristics–Flash Driver Charge Pump Section
VIN = 3.5V, CIN = 2.2µF, C3 = CF = 1.0µF, TA = 25°C, unless otherwise noted.
Output Voltage vs. Output Current
Efficiency vs. Supply Voltage
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
100
90
80
70
60
50
40
30
20
10
0
50mA
VIN=3.3
VIN=3.6
100mA
150mA
VIN = 2.7
VIN = 3.0
0
40
80
120
160
200
2.7
3.0
3.3
3.6
3.9
4.2
4.5
Output Current (mA)
Supply Voltage (V)
Efficiency vs. Load Current
Maximum Current Pulse vs. Supply Voltage
600
500
400
300
100
V
IN = 3.0V
90
80
70
60
50
40
30
20
10
0
V
IN = 2.7V
VIN = 3.6V
V
IN = 3.3V
One-shot pulse duration = 250ms
VOUT> 4.0V
200
100
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0.1
1.0
10
100
1000
Supply Voltage (V)
Load Current (mA)
Load Response
(100mA Load)
Load Response
(50mA Load)
V
IN = 3.5V
V
IN = 3.5V
VOUT
(10mV/div)
VOUT
(10mV/div)
IOUT
(50mA/div)
IOUT
(20mA/div)
Time (5ms/div)
Time (5ms/div)
2801.2006.04.1.3
11
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
