High Efficiency White LED Drivers
for Backlight and Keypad
Typical Characteristics
Line Transient
(All Channels = 20mA)
Enable Threshold Low (V)
4.5
1.1
1.0
AAT1235
Enable Threshold Low vs.
Supply Voltage and Temperature
Output Voltage (bottom) (V)
Input Voltage (top) (V)
4.0
3.5
3.0
14.2
14.1
14.0
13.9
13.8
-40°C
0.9
0.8
0.7
25°C
+85°C
0.6
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Time (50µs/div)
Supply Voltage (V)
Enable Threshold High vs.
Supply Voltage and Temperature
Enable Threshold High (V)
1.2
1.1
1.0
0.9
0.8
0.7
2.7
280
260
Input Disconnect Switch Resistance vs.
Supply Voltage and Temperature
+120°C
+100°C
R
DS(ON)IN
(mΩ)
Ω
-40°C
25°C
240
220
200
+85°C
180
160
140
2.5
+85°C
+25°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Supply Voltage (V)
Low Side Switch On Resistance
vs. Supply Voltage and Temperature
160
140
Soft Start Operation
(All Channels = 20mA)
EN/SET (V)
2
0
R
DS(ON)N
(mΩ)
Ω
+120°C
120
+100°C
100
80
20
10
V
OUT
(V)
+25°C
+85°C
I
INDUCTOR
(A)
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0
0.5
0
60
40
2.5
Supply Voltage (V)
Time (200µs/div)
1235.2007.02.1.1
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
