PRODUCT DATASHEET
AAT3123/23A/24
ChargePump
TM
High Efficiency 1X/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.
Efficiency vs. Input Voltage
(4x20mA)
100
95
90
85
80
75
70
65
60
55
50
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
V
DIODE
= 3.2V
V
DIODE
= 3.0V
V
DIODE
= 3.4V
100
95
90
Efficiency vs. Input Voltage
(4x10mA)
Efficiency (%)
V
DIODE
= 3.2V
V
DIODE
= 3.0V
V
DIODE
= 3.4V
Efficiency (%)
85
80
75
70
65
60
55
50
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
Input Voltage (V)
Input Voltage (V)
I
DIODE
vs. Input Voltage
(4x20mA)
85
V
DIODE
= 3.2V
80
V
DIODE
= 3.4V
45
I
DIODE
vs. Input Voltage
(4x10mA)
I
DIODE
(mA)
I
DIODE
(mA)
75
70
65
60
2.7
V
DIODE
= 3.0V
V
DIODE
= 3.2V
40
V
DIODE
= 3.4V
V
DIODE
= 3.0V
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
35
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
Input Voltage (V)
Input Voltage (V)
Quiescent Current vs. Input Voltage
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6 V
DIODE
= 3.0V
0.4
0.2
0.0
2.7 2.9 3.1 3.3
0.850
0.825
0.800
0.775
0.750
V
DIODE
= 3.4V
V
DIODE
= 3.2V
0.725
0.700
0.675
0.650
0.625
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
0.600
2.5
3.0
V
IH
and V
IL
vs. V
IN
Quiescent Current (mA)
V
IH
V
IL
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Input Voltage (V)
3123.2008.03.1.5
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