TPS54973PWPRG4 datasheet(7/10 Pages) TI

Part #	TPS54973PWPRG4

Description	3-V TO 4-V INPUT, 9-A OUTPUT SYNCHRONOUS BUCK SWITCHER WITH DISABLED SINKING DURING START-UP

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Manufacturer	TI [Texas Instruments]

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7 / 10 page

TPS54973

SLVS453A − FEBRUARY 2003 − REVISED FEBRUARY 2005

www.ti.com

7

TYPICAL CHARACTERISTICS

Figure 1

0

5

10

15

20

25

−40

0

25

85

125

VIN = 3.0 V

IO = 9 A

DRAIN-SOURCE

ON-STATE RESISTANCE

vs

JUNCTION TEMPERATURE

TJ − Junction Temperature − °C

Figure 2

250

350

450

550

650

750

−40

0

25

85

125

TJ − Junction Temperature − °C

INTERNALLY SET

OSCILLATOR FREQUENCY

vs

JUNCTION TEMPERATURE

SYNC ≥ 2.5 V

SYNC ≤ 0.8 V

Figure 3

200

300

400

500

600

700

800

−40

0

25

85

125

TJ − Junction Temperature − °C

EXTERNALLY SET

OSCILLATOR FREQUENCY

vs

JUNCTION TEMPERATURE

RT = 68 k

RT = 100 k

RT = 180 k

Figure 4

0.885

0.887

0.889

0.891

0.893

0.895

−40

0

25

85

125

TJ − Junction Temperature − °C

VOLTAGE REFERENCE

vs

JUNCTION TEMPERATURE

Figure 5

IL − Load Current − A

DEVICE POWER LOSSES

vs

LOAD CURRENT

0

1

2

3

4

5

6

7

8

0

2

4

6

8

10121416

VI = 3.3 V

TJ = 125°C

Figure 6

0.885

0.887

0.889

0.891

0.893

0.895

3

3.1

3.2

3.3

3.4

3.5

3.6

VI − Input Voltage − V

OUTPUT VOLTAGE REGULATION

vs

INPUT VOLTAGE

Figure 7

−20

0

20

40

60

80

100

120

140

1

100

1 k

1 M

−200

−180

−160

−140

−120

−100

−80

−60

−40

−20

0

10

10 k 100 k

10 M

f − Frequency − Hz

ERROR AMPLIFIER

OPEN LOOP RESPONSE

Phase

Gain

RL = 10 kΩ,

CL = 160 pF,

TA = 25°C

Figure 8

2.75

2.90

3.05

3.20

3.35

3.50

3.65

−40

0

25

85

125

TJ − Junction Temperature − °C

INTERNAL SLOW-START TIME

vs

JUNCTION TEMPERATURE

3.80

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