TPS54317 datasheet(7/17 Pages) TI

Part #	TPS54317

Description	1.6 MHz, 3-V TO 6-V INPUT, 3-A SYNCHRONOUS STEP-DOWN SWIFT CONVERTER

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Manufacturer	TI [Texas Instruments]

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TYPICAL CHARACTERISTICS

0

20

40

60

80

100

120

−40

0

25

85

125

VI = 3.3 V

TJ − Junction Temperature − °C

0

20

40

60

80

100

−40

0

25

85

125

VI = 5 V

TJ − Junction Temperature − °C

450

−40

0

25

550

750

85

125

650

350

250

TJ − Junction Temperature − °C

SYNC

≥ 2.5 V

SYNC

≤ 0.8 V

0.889

−40

0

25

0.895

85

125

0.893

0.887

0.885

TJ − Junction Temperature − °C

0.891

1050

−40

0

25

1100

1200

85

125

1150

1000

T − Junction T

J

emperature − C

o

RT = 43 kW

450

500

−40

0

25

600

85

125

550

400

T − Junction T

J

emperature − C

o

RT = 100 kW

f − Frequency − Hz

60

40

0

10

100

1 k

10 k 100 k 1 M

80

100

140

10 M

120

20

−20

0

−20

−40

−60

−80

−100

−120

−140

−160

−180

−200

RL= 10 kΩ,

CL = 160 pF,

TA = 25°C

Phase

Gain

TJ − Junction Temperature − °C

3.35

3.20

2.90

−40

0

25

85

3.50

3.65

125

3.80

3.05

2.75

0

0.2

0.4

0.6

0.8

1

1.2

0

1

1.5

2

2.5

0.5

3

I

− Output Current − A

O

T = 25 C,

A

o

f = 700 kHz,

V = 5 V,

V

= 3.3 V

s

I

O

TPS54317

SLVS619A – NOVEMBER 2005 – REVISED FEBRUARY 2006

DRAIN-SOURCE ON-STATE

INTERNALLY SET OSCILLATOR

RESISTANCE

FREQUENCY

vs

JUNCTION TEMPERATURE

Figure 1.

Figure 2.

Figure 3.

EXTERNALLY SET OSCILLATOR

VOLTAGE REFERENCE

FREQUENCY

vs

JUNCTION TEMPERATURE

Figure 4.

Figure 5.

Figure 6.

ERROR AMPLIFIER

INTERNAL SLOW-START TIME

DEVICE POWER LOSSES

OPEN LOOP RESPONSE

vs

JUNCTION TEMPERATURE

LOAD CURRENT

Figure 7.

Figure 8.

Figure 9.

7

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