TPS54313-Q1 datasheet(8/20 Pages) TI1

Part #	TPS54313-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

8

TYPICAL CHARACTERISTICS

Figure 1

0

20

40

60

80

100

120

−40

0

25

85

125

IO = 3 A

VI = 3.3 V

TJ − Junction Temperature − °C

DRAIN-SOURCE ON-STATE RESISTANCE

vs

JUNCTION TEMPERATURE

Figure 2

0

20

40

60

80

100

−40

0

25

85

125

IO = 3 A

VI = 5 V

TJ − Junction Temperature − °C

DRAIN-SOURCE ON-STATE RESISTANCE

vs

JUNCTION TEMPERATURE

Figure 3

450

−40

0

25

550

INTERNALLY SET OSCILLATOR

FREQUENCY

vs

JUNCTION TEMPERATURE

750

85

125

650

350

250

TJ − Junction Temperature − °C

FSEL

≥ 2.5 V

FSEL

≤ 0.8 V

Figure 4

400

−40

0

25

500

EXTERNALLY SET OSCILLATOR

FREQUENCY

vs

JUNCTION TEMPERATURE

800

85

125

700

300

200

TJ − Junction Temperature − °C

600

RT = 68 k

RT = 100 k

RT = 180 k

Figure 5

0.889

−40

0

25

VOLTAGE REFERENCE

vs

JUNCTION TEMPERATURE

0.895

85

125

0.893

0.887

0.885

TJ − Junction Temperature − °C

0.891

Figure 6

0.8850

0.8870

0.8890

0.8910

0.8930

0.8950

34

56

f = 350 kHz

TA = 85°C

VI − Input Voltage − V

OUTPUT VOLTAGE REGULATION

vs

INPUT VOLTAGE

Figure 7

f − Frequency − Hz

60

40

0

10

100

1 k

10 k 100 k 1 M

80

100

ERROR AMPLIFIER

OPEN LOOP RESPONSE

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

Figure 8

TJ − Junction Temperature − °C

3.35

3.20

2.90

−40

0

25

85

3.50

3.65

INTERNAL SLOW-START TIME

vs

JUNCTION TEMPERATURE

125

3.80

3.05

2.75

0

0.25

0.5

0.75

1

1.25

1.5

1.75

2

2.25

01

2

3

4

IL − Load Current − A

DEVICE POWER LOSSES

vs

LOAD CURRENT

TJ − 125°C,

fs = 700 kHz

VI = 3.3 V

VI = 5 V

Figure 9

Obsolete Devices:

TPS54314-Q1 and TPS54315-Q1

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