AAT1235 Datasheet, PDF (5/21 Pages) Advanced Analogic Technologies – High Efficiency White LED Drivers for Backlight and Keypad

Typical Characteristics
83
82
81
80
79
78
77
76
1.6
Efficiency vs. LED Current
(Group B On; Group A Off)
V_IN = 5V
V_IN = 3.6V
V_IN = 4.2V
3.9
6.2
8.5 10.8 13.1 15.4 17.7
20
Output LED Current (mA)
AAT1235
High Efficiency White LED Drivers
for Backlight and Keypad
Efficiency vs. LED Current
(Group B Off; Group A On)
84
83
V_IN = 5V
82
81
80
V_IN = 3.6V
79
V_IN = 4.2V
78
77
1.6
3.9
6.2
8.5 10.8 13.1 15.4 17.7
20
Output LED Current (mA)
Efficiency vs. LED Current
(Group A and B On)
86
85
84
V_IN = 5V
83
82
V_IN = 3.6V
81
V_IN = 4.2V
80
79
1.6
3.9
6.2
8.5 10.8 13.1 15.4 17.7
20
Output LED Current (mA)
LED Current Accuracy vs. Supply Voltage
3
2
I_{B1, B2, A1, A2, A3}
1
0
-1
-2
-3
2.7
3.1
3.4
3.8
4.1
4.5
4.8
5.2
5.5
Supply Voltage (V)
LED Current vs. Supply Voltage
20.0
I_B1
19.8
19.6
I_A1
19.4
19.2
19.0
I_A3
18.8
I_B2
I_A2
18.6
18.4
2.7 3.1 3.4 3.8 4.1 4.5 4.8 5.2 5.5
Supply Voltage (V)
Shutdown Current vs.
Supply Voltage and Temperature
0.7
0.6
25°C
0.5
85°C
0.4
0.3
0.2
0.1
-40°C
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Supply Voltage (V)
1235.2007.02.1.1
5