AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, V
IN
= 3.5V, C
IN
= C
OUT
= C
1
= C
2
= 1µF, T
A
= 25°C.
I
DIODE
vs. Input Voltage
(4x20mA)
90
85
80
75
V
DIODE
= 3.3V
V
DIODE
= 3.4V
V
DIODE
= 3.5V
V
DIODE
= 3.6V
0.850
0.825
0.800
0.775
0.750
0.725
0.700
0.675
0.650
0.625
0.600
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
IH
and V
IL
vs. V
IN
I
DIODE
(mA)
70
65
60
55
50
45
40
V
IH
V
IL
Input Voltage (V)
Input Voltage (V)
Turn-On to Full-Scale Charge Pump
ENSET
(1V/div)
OUT
(2V/div)
V
DIODE
(1V/div)
I
IN
(200mA/div)
Time (50µs/div)
Turn-On to Full-Scale Load Switch
ENSET
(1V/div)
OUT
(2V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Time (50µs/div)
Turn-Off
V
IN
ENSET
(1V/div)
20mV/div
80mA Load Characteristics
V
DIODE
(2V/div)
OUT
I
IN
(100mA/div)
V
DIODE
Time (200µs/div)
Time (1µs/div)
3132.2005.12.1.4
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
