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
Load Transient Response
(V
IN
= 3.0V)
I
OUT
(200mA/div)
Load Transient Response
(V
IN
= 4.2V)
I
OUT
(200mA/div)
V
OUT
(20mV/div)
V
OUT
(20mV/div)
Time (50µs/div)
Time (50µs/div)
Input and Output Ripples
(I
OUT
= 50mA @ V
IN
= 3.5V)
Input and Output Ripples
(I
OUT
= 100mA @ V
IN
= 3.5V)
V
IN
AC Coupled
(20mV/div)
V
OUT
AC Coupled
(20mV/div)
V
IN
AC Coupled
(20mV/div)
V
OUT
AC Coupled
(20mV/div)
Time (5µs/div)
Time (5µs/div)
Output Current vs. Input Voltage
(500ms Pulse Time; V
OUT
> 4.0V)
800
800
Output Current vs. Input Voltage (70°C)
(V
OUT
> 4.0V)
50ms
700
600
500
400
300
200
100
0
2.5
3.0
3.5
4.0
4.5
200ms 300ms
500ms
100ms
Output Current (mA)
700
600
500
400
300
200
100
0
2.5
3
3.5
4
4.5
Input Voltage (V)
Output Current (mA)
Input Voltage (V)
3112.2007.01.1.5
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
