AAT1235 Datasheet, PDF (6/21 Pages) Advanced Analogic Technologies – High Efficiency White LED Drivers for Backlight and Keypad

Typical Characteristics
LED Current vs. Temperature
(All Channels = 20mA)
21.2
21.0
20.8
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
-40
IA3
IB1
IB2
-15
10
35
Temperature (°C)
IA2
IA1
60
85
AAT1235
High Efficiency White LED Drivers
for Backlight and Keypad
LED Current Accuracy vs. Temperature
(All Channels = 20mA)
4
3
2
1
0
IB1
-1
IA2
IA3
-2
-3
IB2, A1
-4
-5
-6
-40
-15
10
35
60
85
Temperature (°C)
Shutdown Operation
(All Channels)
5
Enable (V)
0
50
I_{GROUP_A} (mA) ₀
50
I_{GROUP_B} (mA)
0
0.5
I_INDUCTOR (A)
0
Time (50µs/div)
Output Ripple
(All Channels = 20mA)
14.5
14.0
13.5
16V
0V
1.0
0.5
0.0
Time (200ns/div)
Output Ripple
(All Channels = 10mA)
13.5
13.0
12.5
14V
0V
0.5
0.0
Time (200ns/div)
Switching Frequency vs.
Supply Voltage and Temperature
2.5
2.0
25°C
1.5
-40°C
1.0
+85°C
0.5
0.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Supply Voltage (V)
6
1235.2007.02.1.1