FAN5353 datasheet(6/13 Pages) FAIRCHILD

部品番号	FAN5353

部品情報	3MHz, 3A Synchronous Buck Regulator

PDF	13 Pages

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メーカー	FAIRCHILD [Fairchild Semiconductor]

ホームページ	http://www.fairchildsemi.com

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FAN5353 • Rev. 1.0.2

Typical Characteristics

Unless otherwise specified, VIN = 5V, VOUT = 1.2V, circuit of Figure 1, and components per Table 1.

VOUT

Iload

Figure 9. Load Transient Response: 100mA to 1.5A to

100mA, tr=tf=100ns, Horizontal Scale = 5µs/div.

Figure 10. Load Transient Response: 500mA to 3A to

500mA, tr=tf=100ns, Horizontal Scale = 5µs/div.

0.1

100

1000

10000

Load Current (mA)

5VIN,1.2VOUT

3.3VIN,1.2VOUT

5VIN, 3.3VOUT

0.5

1.0

1.5

2.0

2.5

3.0

3.5

00.5

11.5

22.5

Load Current (A)

VIN = 4.1V

VIN = 4.0V

VIN = 3.9V

VIN = 3.8V

Figure 11. Output Voltage Ripple vs. Load Current

Figure 12. Effect of tOFF Minimum on Reducing the

Switching Frequency at Large Duty Cycles, VOUT = 3.3V

0.01

0.1

100

Frequency (KHz)

1.2VOUT,1.5A load

1.2VOUT, 3A load

3.3VOUT,1.5A load

VOUT

V IN

Figure 13. Power Supply Rejection Ratio

Figure 14. Line Transient Response with 1A load, 10µs/div.

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