FAN5353 Fairchild Semiconductor, FAN5353 Datasheet - Page 6

• Manufacturer Part Number: FAN5353
• Description: The FAN5353 is a step-down switching voltage regulator that delivers an adjustable output from an input voltage supply of 2
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN5353 • Rev. 1.0.2
Typical Characteristics
Unless otherwise specified, V
Figure 9. Load Transient Response: 100mA to 1.5A to
Figure 11. Output Voltage Ripple vs. Load Current
100mA, t
20
18
16
14
12
10
8
6
4
2
0
90
80
70
60
50
40
30
20
0.1
0.01
Figure 13. Power Supply Rejection Ratio
r
=t
1
f
=100ns, Horizontal Scale = 5µs/div.
1.2VOUT,1.5A load
1.2VOUT, 3A load
3.3VOUT,1.5A load
0.1
10
Load Current (mA)
Frequency (KHz)
I
IN
V
I
load
L
OUT
= 5V, V
1
100
5VIN,1.2VOUT
3.3VIN,1.2VOUT
5VIN, 3.3VOUT
OUT
= 1.2V, circuit of Figure 1, and components per Table 1.
10
1000
100
10000
6
Figure 14. Line Transient Response with 1A load, 10µs/div.
Switching Frequency at Large Duty Cycles, V
Figure 10. Load Transient Response: 500mA to 3A to
Figure 12. Effect of t
500mA, t
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-
0
r
=t
f
0.5
=100ns, Horizontal Scale = 5µs/div.
1
OFF
V
Load Current (A)
IN
Minimum on Reducing the
V
OU T
1.5
VIN = 4.1V
VIN = 4.0V
VIN = 3.9V
VIN = 3.8V
2
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2.5
OUT
= 3.3V
3