AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
Typical Characteristics-AAT3112-5.0V
V
IN
=3.5V, C
IN
=C
OUT
=10µF, C1=C2=1µF, T
A
=25°C, unless otherwise noted.
Output Voltage vs. Output Current
5.5
30
Supply Current vs. Supply Voltage
(No Load, No Switching)
Supply Current (µA)
µ
5.4
Output Voltage (V)
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
0
50
100
150
200
250
300
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.9V
25
20
15
10
5
0
2.5
3.0
3.5
4.0
4.5
5.0
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
> 4.5V
Maximum Current Pulse (mA)
1000
900
800
700
600
500
400
300
3.0
Efficiency vs. Supply Voltage
95
90
100mA
Efficiency (%)
85
80
75
70
65
60
55
50
45
40
200mA
50mA
3.2
3.4
3.6
3.8
4.0
4.2
2.7
3.0
3.3
3.5
3.8
4.1
4.4
4.7
4.9
Input Voltage (V)
Input Voltage (V)
3112.2004.12.1.2
9