CAT4137 Datasheet, PDF (5/16 Pages) Catalyst Semiconductor – CMOS Boost Converter - White LED Driver

CAT4137
TYPICAL CHARACTERISTICS
V_IN = 3.6V, C_IN = 1.0uF, C_OUT = 0.22µF, L = 22µH, with 3 LEDs at 20mA, T_AMB=25ºC, unless otherwise specified.
FB Pin Voltage vs. Temperature
304
Shutdown Voltage vs. Input Voltage
1.0
302
25°C
-40°C
0.8
300
298
3 LEDs at 20mA
296
0.6
85°C
0.4
294
-50 -25 0 25 50 75 100
TEMPERATURE [°C]
Under Voltage Lock Out vs. Temperature
2.2
2.1
2.0
1.9
1.8
1.7
1.6
-50 -25 0 25 50 75 100
TEMPERATURE [°C]
Switching Waveforms (3 LEDs in Series)
0.2
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE [V]
Switching Frequency vs. Temperature
1.10
20mA per LED
1.05
1.00
0.95
0.90
-50 -25 0 25 50 75 100
TEMPERATURE [ºC]
Switching Waveforms (2 LEDs in Series)
© Catalyst Semiconductor, Inc.
5
Characteristics subject to change without notice
Doc. No. MD-5012 Rev. B