TPS54873_16 datasheet(7/23 Pages) TI1

Part #	TPS54873

Description	4-V TO 6-V INPUT, 8-A OUTPUT SYNCHRONOUS BUCK SWITCHER WITH DISABLED SINKING DURING START-UP

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TPS54873

SLVS444A − OCTOBER 2002 − REVISED FEBRUARY 2005

www.ti.com

7

TYPICAL CHARACTERISTICS

Figure 1

0

10

20

30

40

50

60

−40

−15

10

35

60

85

110

135

VI = 5 V,

IO = 8 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

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

012

3

45

67

8

IL − Load Current − A

DEVICE POWER LOSSES

vs

LOAD CURRENT

TJ = 125°C

fs = 700 kHz

VI = 5 V

Figure 5

Figure 6

VI − Input Voltage − V

OUTPUT VOLTAGE REGULATION

vs

INPUT VOLTAGE

0.885

0.887

0.889

0.891

0.893

0.895

4.5

4.8

5.1

5.4

5.7

6

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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