FAN5354MPX datasheet(6/14 Pages) FAIRCHILD

Part #	FAN5354MPX

Description	3MHz, 3A Synchronous Buck Regulator

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FAN5354 • Rev. 1.0.5

6

Typical Characteristics

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

0

100

200

300

400

500

600

700

800

900

1000

2.7

3.2

3.7

4.2

4.7

5.2

Input Voltage(V)

1.2VOUT boundary

3.3VOUT boundary

Always PWM

Always PFM

Hysteresis

-

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0

0.5

1

1.5

2

2.5

3

Load Current (A)

VIN = 4.1V

VIN = 4.0V

VIN = 3.9V

VIN = 3.8V

Figure 9. PFM/PWM Mode-Change Boundaries

Figure 10. Effect of tOFF Minimum on Reducing Switching

Frequency at Large Duty Cycles, VOUT=3.3V

0

2

4

6

8

10

12

14

16

0.1

1

10

100

1000

10000

Load Current(mA)

5VIN, 1.2VOUT

3.3VIN, 1.2VOUT

5VIN,3.3VOUT

PFM

PWM

20

30

40

50

60

70

80

90

0.01

0.1

1

10

100

Frequency (KHz)

1.2VOUT,1.5A load

3.3VOUT, 0.5A load in PFM

3.3VOUT, 1.5A load

Figure 11. Output Voltage Ripple vs. Load Current

(See explanation on page 12)

Figure 12. Power Supply Rejection Ratio (PSRR)

VOUT

IL

Figure 13. PFM-to-PWM Mode Transition, Slowly

Increasing Load Current, 2 s/div.

Figure 14 PWM-to-PFM Mode Transition, Slowly

Decreasing Load Current, 2 s/div.

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