CAT4237
TYPICAL CHARACTERISTICS
(V IN = 3.6 V, C IN = 4.7 m F, C OUT = 0.22 m F, L = 33 m H with 8 LEDs at 20 mA, T AMB = 25 ° C, unless otherwise specified.)
EN
5V/div
VOUT
10V/div
Input
Current
100mA/
div
2.0
1.5
1.0
0.5
0
2.5
3.0
3.5
4.0
4.5
303
50 m sec/div
Figure 16. Power ? up with 8 LEDs at 20 mA
1.0
INPUT VOLTAGE (V)
Figure 17. Switch ON Resistance vs. Input
Voltage
302
301
300
299
0.8
0.6
? 40 ° C
25 ° C
85 ° C
125 ° C
298
V IN = 3.6 V, 8 LEDs
I LED = 20 mA
0.4
297
? 50
0
50
100
150
0.2
3.0
3.5
4.0
4.5
5.0
TEMPERATURE ( ° C)
Figure 18. FB Pin Voltage vs. Temperature
140
120
INPUT VOLTAGE (V)
Figure 19. Shutdown Voltage vs. Input Voltage
100
80
60
40
20
VOUT = 15 V
VOUT = 20 V
0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 20. Maximum Output Current vs. Input
Voltage
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