Datasheet

CAT3649
http://onsemi.com
5
TYPICAL PERFORMANCE CHARACTERISTICS
(V
IN
= 3.6 V, PWM = V
IN
, I
OUT
= 120 mA (6 LEDs at 20 mA), C
IN
= C
OUT
= C
1
= C
2
= 1 mF, C
PWM
= 47 nF,
T
AMB
= 25°C unless otherwise specified.)
1.33x
Figure 4. Quiescent Current vs. Input Voltage Figure 5. Quiescent Current vs. Temperature
INPUT VOLTAGE (V) TEMPERATURE (°C)
2.53.03.54.04.55.0
0
1
2
3
4
12080400−40
0
1
2
3
4
Figure 6. LED Current Change vs. Input
Voltage
Figure 7. LED Current Change vs.
Temperature
INPUT VOLTAGE (V) TEMPERATURE (°C)
5.55.04.54.03.53.02.5
−10
−8
−6
−2
2
4
8
10
12080400−40
Figure 8. Switching Frequency vs.
Temperature
Figure 9. Output Resistance vs. Input Voltage
TEMPERATURE (°C) INPUT VOLTAGE (V)
12080400−40
0.7
0.8
0.9
1.0
1.1
1.2
1.3
5.55.04.54.03.53.02.52.0
0
2
4
6
8
10
12
QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA)
LED CURRENT VARIATION (%) LED CURRENT VARIATION (%)
SWITCHING FREQUENCY (MHz)
OUTPUT RESISTANCE (W)
1x
1.33x
1.5x
2x
V
F
= 3.3 V
V
IN
= 2.6 V
V
IN
= 2.9 V
V
IN
= 3.3 V
V
IN
= 4.0 V
1x
1.5x
2x
−4
0
6
−10
−8
−6
−2
2
4
8
10
−4
0
6
V
F
= 3.3 V
1.5x Mode
1.33x, 2x Mode
1.33x
1x
1.5x
2x