500mA High Efficiency Charge Pump
for White LED Flash Applications
Typical Characteristics-AAT3112-4.5V
V
IN
= 3.5V, C
IN
= C
OUT
= 10μF, C
1
= C
2
= 1μF; T
A
= 25°C, unless otherwise noted.
AAT3112
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)
Time (50µs/div)
Time (50µs/div)
Maximum Current Pulse vs. Input Voltage
(50ms pulse; V
OUT
> 4.0V)
Efficiency vs. Input Voltage
85
80
Maximum Current Pulse (mA)
800
700
600
500
400
300
3
3.2
3.4
3.6
3.8
4
4.2
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
3112.2007.01.1.5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
