PRODUCT DATASHEET
AAT1239-1
SwitchReg
TM
Typical Characteristics
Transition of LED Current
(10 White LEDs; SEL = Low; I
LED
= 3mA to 13mA)
Output Voltage (top) (V)
Output Voltage (top) (V)
34
40V Step-Up Converter for 4 to 10 White LEDs
Transition of LED Current
(10 White LEDs; SEL = Low; I
LED
= 13mA to 6mA)
34
Feedback Voltage
(bottom) (V)
Feedback Voltage
(bottom) (V)
32
30
28
0.4
0.3
0.2
0.1
0.0
32
30
0.4
0.3
0.2
0.1
0.0
Time (50µs/div)
Time (50µs/div)
Input Disconnect Switch Resistance
vs. Input Voltage
300
280
260
240
Low Side Switch On Resistance
vs. Input Voltage
120°C
100°C
R
DS(ON)IN
(mΩ)
Ω
240
220
200
180
160
140
2.7
3.1
3.5
3.9
100°C
R
DS(ON)L
(mΩ)
Ω
260
120°C
220
200
180
160
140
120
100
4.3
4.7
5.1
5.5
80
2.7
25°C
85°C
85°C
25°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
EN/SET Latch Timeout vs. Input Voltage
EN/SET Latch Timeout (µs)
350
300
EN/SET Off Timeout vs. Input Voltage
EN/SET Off Timeout (µs)
300
250
200
250
200
150
100
50
2.7
-40°C
-40°C
85°C
25°C
25°C
85°C
150
100
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Input Voltage (V)
1239-1.2008.06.1.1
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