Dual High Efficiency Charge Pump
for White LED and Flash Applications
Typical Characteristics–Flash Driver Charge Pump Section
Output Voltage vs. Output Current
(V
OUT_FL
= 4.5V; EN_FL = V
IN
; EN/SET = GND)
4.60
AAT2805
Maximum Current Pulse vs. Supply Voltage
(V
OUT_FL
= 4.5V; EN_FL = V
IN
; EN/SET = GND)
Maximum Current Pulse (mA)
450
400
350
300
250
200
150
100
50
Output Voltage (V)
4.56
4.52
4.48
4.44
One-shot pulse duration = 250ms
V
OUT
> 4.0V
3.6V
3.0V
2.7V
3.3V
4.40
0.1
1.0
10.0
100.0
1000.0
0
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
Output Current (mA)
Supply Voltage (V)
Start-Up Time
(50mA Load)
Start-Up Time
(100mA Load)
EN_FLSH
(1V/div)
EN_FLSH
(1V/div)
V
OUT_FL
(1V/div)
V
OUT_FL
(1V/div)
TIme (100µs/div)
TIme (100µs/div)
Load Response vs. Time
(50mA Load)
V
IN
= 3.5V
V
OUT_FL
(10mV/div)
V
OUT_FL
(10mV/div)
Load Response vs. Time
(100mA Load)
V
IN
= 3.5V
I
OUT
(20mA/div)
I
OUT
(50mA/div)
Time (5ms/div)
Time (5ms/div)
2805.2006.04.1.7
5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
