AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
Typical Characteristics-AAT3112-4.5V
V
IN
=3.5V, C
IN
=C
OUT
=10µF, C1=C2=1µF, T
A
=25°C, unless otherwise noted.
Output Voltage vs. Output Current
5.0
30
Supply Current vs. Supply Voltage
(No Load, No Switching)
Supply Current (µA)
µ
4.9
Output Voltage (V)
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
0
25
20
15
10
5
0
V
IN
= 3.6V
V
IN
= 3.9V
V
IN
= 4.2V
50
100
150
200
250
300
2.5
3.0
3.5
4.0
4.5
Output Current (mA)
Supply Voltage (V)
Startup Time with 100mA Load
Startup Time with 200mA Load
EN
(2V/div)
EN
(2V/div)
V
OUT
(1V/div)
V
OUT
(1V/div)
50µs/div
µ
50µs/div
µ
Maximum Current Pulse (50ms pulse)
vs. Input Voltage, V
OUT
> 4.0V
Maximum Current Pulse (mA)
800
700
600
500
400
300
3
3.2
3.4
3.6
3.8
4
4.2
Efficiency vs. Supply Voltage
85
80
50mA
Efficiency (%)
75
70
65
60
55
50
45
40
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
200mA
100mA
Input Voltage (V)
Input Voltage (V)
6
3112.2004.12.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
