cat4237 Catalyst Semiconductor, cat4237 Datasheet - Page 7

• 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
Maximum Output Current vs. Input Voltage
303
302
301
300
299
298
297
140
120
100
80
60
40
20
-50
0
IN
2.5
FB pin voltage vs. Temperature
Power-up with 8 LEDs at 20mA
= 4.7μF, C
3.0
TEMPERATURE [ºC]
0
INPUT VOLTAGE [V]
VOUT = 15V
VOUT = 20V
V
I
LED
OUT
3.5
IN
=3.6V, 8LEDs
=20mA
50
= 0.22µF, L = 33µH with 8 LEDs at 20mA, T
4.0
100
4.5
150
5.0
7
Switch ON Resistance vs. Input Voltage
1.0
0.8
0.6
0.4
0.2
2.0
1.5
1.0
0.5
0.0
Shutdown Voltage vs. Input Voltage
3.0
2.5
AMB
85°C
25°C
= 25ºC, unless otherwise specified.
3.5
3.0
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
4.0
3.5
-40°C
125°
4.5
4.0
C
Doc. No. MD-5013, Rev. B
CAT4237
5.0
4.5