cat4237 Catalyst Semiconductor, cat4237 Datasheet - Page 5

• Manufacturer Part Number: cat4237
• Description: High Voltage Cmos Boost White Led Driver
• Manufacturer: Catalyst Semiconductor

TYPICAL CHARACTERISTICS
V
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
IN
= 3.6V, C
Quiescent Current vs. V
1040
1020
1000
Switching Frequency vs. Supply Voltage
140
120
100
315
310
305
300
295
290
285
980
960
80
60
40
20
0
FB pin voltage vs. Supply Voltage
2.7
2.7
2.7 3.0
IN
= 4.7μF, C
3.0
3.0
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
3.3
3.3
3.3 3.6 3.9 4.2
8LEDs at 20mA
VOUT= 26V
3.6
3.6
OUT
= 0.22µF, L = 33µH with 8 LEDs at 20mA, T
VFB =0.4V
(not switching)
3.9
3.9
IN
(Not Switching)
4.2
4.2
4.5 4.8
4.5
4.5
4.8
4.8
5
315
310
305
300
295
290
285
Quiescent Current vs. V
2.0
1.5
1.0
0.5
0.0
FB Pin Voltage vs. Output Current
2.5
0
AMB
Switching Waveforms
5
OUTPUT CURRENT [mA]
3.0
INPUT VOLTAGE [V]
= 25ºC, unless otherwise specified.
8 LEDs
10
3.5
15
4.0
IN
20
(Switching)
4.5
25
Doc. No. MD-5013, Rev. B
CAT4237
5.0
30