SLVSAZ6A – SEPTEMBER 2011 – REVISED MARCH 2012
TYPICAL CHARACTERISTICS
V
IN
= 12 V, T
A
= 25°C (unless otherwise noted).
100
L = CLF7045
EN (10 V/div)
90
Efficiency (%)
80
70
60
50
40
0.0
G007
VREG5 (5 V/div)
V
OUT
(0.5 V/div)
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
0.5
1.0
1.5
2.0
Output Current (A)
2.5
3.0
G008
400 µs/div
Figure 7. START-UP WAVE FORM
900
850
Switching Frequency (kHz)
800
750
700
650
600
550
500
450
400
0
V
OUT
= 1.05 V
V
OUT
= 1.2 V
V
OUT
= 1.5 V
V
OUT
= 1.8 V
V
OUT
= 2.5 V
V
OUT
= 3.3 V
V
OUT
= 5.0 V
5
10
Input Voltage (V)
15
20
G009
Figure 8. EFFICIENCY vs OUTPUT CURRENT
900
I
OUT
= 1 A
Switching Frequency (kHz)
850
800
750
700
650
600
550
500
450
400
0
V
IN
= 12 V
V
OUT
= 1.05 V
V
OUT
= 1.8 V
V
OUT
= 3.3 V
0
1
2
2
Output Current (A)
2
3
G010
Figure 9. SWITCHING FREQUENCY vs INPUT VOLTAGE
Figure 10. SWITCHING FREQUENCY vs
OUTPUT CURRENT
V
OUT
= 1.05 V
0.780
I
O
= 1 A
0.775
V
FB
Voltage (V)
0.770
0.765
0.760
0.755
0.750
−40
V
OUT
(10 mV/div)
SW (5 V/div)
−20
0
20
40
60
80
Junction Temperature (°C)
100
120
G011
400 ns/div
G012
Figure 11. Vfb VOLTAGE vs JUNCTION TEMPERATURE
Figure 12. VOLTAGE RIPPLE AT OUTPUT (I
O
= 3 A)
10
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