TPS40042 datasheet(7/36 Pages) TI1

Part #	TPS40042

Description	LOW PIN COUNT, LOW VIN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH EXTERNAL REFERENCE INPUT

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Manufacturer	TI1 [Texas Instruments]

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−40

60

120

Temperature − C

6.1

6.0

5.9

5.8

5.6

5.5

−20

0

40

80

100

5.7

20

VDD = 5 V

−40

60

120

Temperature − C

450

400

300

250

200

100

50

−20

0

40

80

100

150

20

350

RC = 2.5 kΩ

RC =nil

RC = 12.5 kΩ

−40

60

120

Temperature − C

80

70

60

50

30

20

−20

0

40

80

100

40

20

VDD = 3.3 V

VDD = 5 V

−40

60

120

Temperature − C

100

95

85

80

75

65

60

−20

0

40

80

100

70

20

VDD = 2.25 V

VDD = 5.5 V

90

−40

60

120

Temperature − C

0.00

−0.50

−0.10

−0.15

−0.20

−0.40

−0.50

−20

0

40

80

100

−0.35

20

VDD = 5.5 V

−0.45

−0.30

−0.25

−40

60

120

Temperature − C

100

98

96

94

92

90

−20

0

40

80

100

20

VDD = 2.25 V

VDD = 5.5 V

TPS40042

SLUS777 – NOVEMBER 2007

TYPICAL CHARACTERISTICS (continued)

PWM Gain

ILIM Threshold

Figure 7.

Figure 8.

Bootstrap Switch Resistance

Minimum Controllable Pulse Width

Figure 9.

Figure 10.

Maximum Duty Cycle

SW Node Leakage Current

Figure 11.

Figure 12.

7

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