AAT3132 Datasheet, PDF (5/14 Pages) Advanced Analogic Technologies – High Efficiency 1.5X Fractional Charge Pump for White LED Applications

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 = C₁ = C₂ = 1µF, T_A = 25°C.
I_DIODE vs. Input Voltage
(4x20mA)
V_IH and V_IL vs. V_IN
90
V_DIODE = 3.3V V_DIODE = 3.4V V_DIODE = 3.5V
85
V_DIODE = 3.6V
80
0.850
0.825
0.800
75
0.775
V_IH
70
0.750
65
60
0.725
0.700
V_IL
55
0.675
50
0.650
45
0.625
40
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
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)
ENSET
(1V/div)
V_DIODE
(2V/div)
I_IN
(100mA/div)
Turn-Off
Time (200µs/div)
3132.2005.12.1.4
Turn-On to Full-Scale Load Switch
ENSET
(1V/div)
OUT
(2V/div)
V_DIODE
(2V/div)
I_IN
(100mA/div)
Time (50µs/div)
80mA Load Characteristics
V_IN
OUT
V_DIODE
Time (1µs/div)
5