AAT3131
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
Typical Characteristics
Unless otherwise noted, VIN = 3.5V, CIN = COUT = C1 = C2 = 1µF, TA = 25°C.
IDIODE vs. Input Voltage
Efficiency vs. Input Voltage
(4x20mA)
(4x20mA)
90
85
80
75
70
65
60
55
50
45
40
100
95
90
85
80
75
70
65
60
55
50
VDIODE = 3.3V VDIODE = 3.4V VDIODE = 3.5V
VDIODE = 3.6V
VDIODE = 3.3V
VDIODE = 3.4V
VDIODE = 3.5V
VDIODE = 3.6V
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
2.7 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)
VIH and VIL vs. VIN
Quiescent Current vs. Input Voltage
0.850
0.825
0.800
0.775
0.750
0.725
0.700
0.675
0.650
0.625
0.600
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
VIH
VDIODE = 3.3V
VDIODE = 3.4V
VDIODE = 3.5V
VDIODE = 3.6V
VIL
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.50
3.00
3.50
4.00
4.50
5.00
5.50
VIN (V)
Input Voltage (V)
3131.2005.12.1.2
5
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