CAT3604 Datasheet, PDF (6/11 Pages) Catalyst Semiconductor – 4-Channel Regulated Charge Pump White LED Driver

CAT3604
TYPICAL CHARACTERISTICS
V_IN = 3.6V, EN = V_IN, C_IN = C_OUT = 1µF, R_SET = 24kΩ, T_AMB = 25˚C, unless otherwise specified.
Efficiency vs. Input Voltage (4 LEDs)
100
90 ^{1x mode}
80
1.5x mode
70
60
20mA per LED 15mA per LED
50
40
4.2 4.0 3.8 3.6 3.4 3.2 3.0
DISCHARGING BATTERY [V]
Efficiency vs. Total LED Current (4 LEDs)
100
VIN = 4V (1x mode)
90
80
70
60
VIN = 3.2V (1.5x mode)
50
40
0
50
100
150 200
TOTAL LED CURRENT [mA]
LED Current vs. Input Voltage
24
22
1 LED at 20mA
20
4 LEDs at 20mA
18
16
14
4 LEDs at 15mA
12
10
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
Ground Current vs. Input Voltage (1x mode)
0.5
0.4
0.3
0.2
4 LEDs OFF
0.1
0.0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
INPUT VOLTAGE [V]
LED Current vs. Temperature
16.0
4 LEDs at 15mA
15.5
Vin = 4V
15.0
14.5
14.0
-50 -25 0 25 50 75 100 125
TEMPERATURE [˚C]
Ground Current vs. Temperature (1x mode)
0.5
0.4
0.3
0.2
0.1
4 LEDs OFF
Rset = 500k
0.0
-40 -20 0 20 40 60 80 100
TEMPERATURE [˚C]
Doc. No. 5008, Rev. I
© 2005 by Catalyst Semiconductor, Inc.
6
Characteristics subject to change without notice