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