CAT4237 Datasheet, PDF (7/13 Pages) Catalyst Semiconductor – High Voltage CMOS Boost White LED Driver

CAT4237
Typical Characteristics
V_IN = 3.6V, C_IN = 4.7uF, C_OUT = 0.22µF, L = 33µH, with 8 LEDs at 20mA, T_AMB=25ºC, unless otherwise specified.
Power-up with 8 LEDs at 20mA
Switch ON Resistance vs. Input Voltage
2.0
1.5
1.0
0.5
FB pin voltage vs. Temperature
303
302
301
300
299
298
297
-50
V_IN=3.6V, 8LEDs
I_LED=20mA
0
50
100 150
TEMPERATURE [ºC]
Maximum Output Current vs. Input Voltage
140
120
VOUT = 15V
100
80
60
40
VOUT = 20V
20
0
2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE [V]
0.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE [V]
Shutdown Voltage vs. Input Voltage
1.0
25°C
0.8
-40°C
0.6
0.4
85°C
125°C
0.2
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE [V]
© 2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7 of 13
Doc. No. 5013, Rev. A