TPS54373_15 datasheet(11/22 Pages) TI

Part #	TPS54373

Description	3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS BUCK SWITCHER WITH DISABLED SINKING DURING START-UP

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TPS54373

SLVS455B − JANUARY 2003 − REVISED FEBRUARY 2005

www.ti.com

11

PERFORMANCE GRAPHS

Data shown is for the circuit in Figure 10 with precharge disabled (D1 and D2 removed) except for slow-start timing

of Figure 19. All data is for VI = 3.3 V, VO = 2.5 V, fs = 700 kHz and TA = 25°C, unless otherwise specified.

Figure 12

50

55

60

65

70

75

80

85

90

95

100

0

0.5

1

1.5

2

2.5

3

3.5

VI = 5 V, VO = 2.5 V

EFFICIENCY

vs

OUTPUT CURRENT

IO − Output Current − A

VI = 3.3 V, VO = 2.5 V

Figure 13

1.77

1.78

1.79

1.8

1.81

1.82

1.83

0

0.5

1

1.5

2

2.5

3

3.5

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

IO − Output Current − A

VI = 5 V

VI = 3.3 V

Figure 14

3

3.5

4

4.5

5

5.5

6

IO = 3 A

VI − Input Voltage − V

OUTPUT VOLTAGE

vs

INPUT VOLTAGE

1.77

1.78

1.79

1.8

1.81

1.82

1.83

IO = 1.5 A

IO = 0 A

Figure 15

−40

0

10

40

60

100

1 k

10 k

100 k

1 M

−120

−60

30

120

180

f − Frequency − Hz

LOOP RESPONSE

−30

−20

−10

20

30

50

150

60

90

0

−30

−90

Phase

Gain

Figure 16

25

35

45

55

65

75

85

95

105

115

125

01

23

4

AMBIENT TEMPERATURE

vs

LOAD CURRENT

IL − Load Current − A

Safe Operating Area(1)

VI = 3.3 V

VI = 5 V

Figure 17

Time − 1 µs/div

OUTPUT RIPPLE VOLTAGE

(1) Safe operating area is applicable to the test board conditions in the Dissipation Ratings

Figure 18

1.0 µs/div

LOAD TRANSIENT RESPONSE

I = 0.75 A to 2.25 A

Figure 19

5.0 ms/div

SLOW-START TIMING

VO = 1.8 V

VI = 3.3 V

RL = 1 Ω

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