AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Typical Characteristics
Transition of LED Current
(20mA to 1.3mA)
EN
(2V/div)
V
OUT
(1V/div)
V
SINK
(1V/div)
I
IN
(50mA/div)
4.0V
Transition of LED Current
(1.3mA to 20mA)
EN
(2V/div)
V
OUT
(1V/div)
4.2V
0.5V
V
SINK
(1V/div)
I
IN
(50mA/div)
1.5V
Time (100µs/div)
Time (100µs/div)
Output Ripple Waveform
(2X Mode; 20mA Load)
V
IN
(AC Coupled)
(20mV/div)
V
OUT
(AC Coupled)
(20mV/div)
V
SINK
(AC Coupled)
(50mV/div)
200
180
Input Current vs. Input Voltage
V
IN
Falling
V
IN
Rising
Input Current (mA)
160
140
120
100
80
60
40
20
0
I
LED
= 30mA
I
LED
= 20mA
I
LED
= 10mA
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 5.3 5.5
Time (1µs/div)
Input Voltage (V)
8
3193.2007.05.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
