AAT1235 Datasheet, PDF (8/21 Pages) Advanced Analogic Technologies – High Efficiency White LED Drivers for Backlight and Keypad

AAT1235
High Efficiency White LED Drivers
for Backlight and Keypad
Typical Characteristics
EN/SET Off Timeout vs.
Supply Voltage and Temperature
400
-40°C
350
300
250
+85°C
200
150
+25°C
100
50
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Supply Voltage (V)
EN/SET Latch Timeout vs.
Supply Voltage and Temperature
400
350
-40°C
300
250
200
+85°C
150
+25°C
100
50
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Supply Voltage (V)
Transition of LED Current
(Group B = 1.8mA; Group A = 20mA to 1.8mA)
4
2
0
0.02
0
0
Time (250µs/div)
Transition of LED Current
(Group B = 1.8mA to 20mA; Group A = 20mA)
4
2
0
0.02
0
0.02
0
Time (250µs/div)
Transition of LED Current
(Group B = 20mA; Group A = 20mA to 1.8mA)
4
2
0
0.02
0
0.02
0
Time (250µs/div)
8
1235.2007.02.1.1