TPS54312-Q1 datasheet(11/20 Pages) TI1

Part #	TPS54312-Q1

Description	3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS-BUCK PWM SWITCHER WITH INTEGRATED FETs

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Manufacturer	TI1 [Texas Instruments]

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TPS54311-Q1, TPS54312-Q1

TPS54313-Q1, TPS54314-Q1

TPS54315-Q1, TPS54316-Q1

SGLS242G − OCTOBER 2004 − REVISED SEPTEMBER 2008

www.ti.com

11

PERFORMANCE GRAPHS

50

60

70

80

90

100

01

2

3

4

5

Load Current − A

EFFICIENCY

vs

LOAD CURRENT

3.3 VI

5 VI

Efficiency at 700 kHz

Figure 12

Figure 13

1.7

1.75

1.8

1.85

1.9

01

23

4

5

IL − Load Current − A

OUTPUT VOLTAGE

vs

LOAD CURRENT

3.3 VI

5 VI

−30

−15

0

30

45

60

100

1 k

10 k

100 k

1 M

−90

−45

0

45

90

180

f − Frequency − Hz

LOOP RESPONSE

Gain

Phase

15

135

Figure 14

VO (AC)

10 mV/div

VI = 5 V

IO = 3 A

400 ns/div

OUTPUT RIPPLE VOLTAGE

Time − 100

µs/div

Figure 15

Figure 16

Figure 17

VO 50 mV/div

LOAD TRANSIENT RESPONSE

IO 2 A/div

Time − 10

µs/div

VI 2 V/div

VO 2 V/div

VPWRGD 5 V/div

START-UP WAVEFORMS

Time − 2 ms/div

VI = 5 V

75

55

35

01

2

85

95

AMBIENT TEMPERATURE

vs

LOAD CURRENT

125

34

115

45

25

65

105

IL − Load Current − A

Safe Operating Area†

† Safe operating area is applicable to the test

board conditions listed in the Dissipation Rating

Table section of this data sheet.

Figure 18

Obsolete Devices:

TPS54314-Q1 and TPS54315-Q1

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