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Typical Characteristics

PT79SR105, -5.0 VDC

(See Note 1)

Efficiency vs Output Current

Efficiency vs Output Current

Efficiency vs Output Current

Ripple vs Output Current

Ripple vs Output Current

Ripple vs Output Current

Power Dissipation vs Output Current

Power Dissipation vs Output Current

Power Dissipation vs Output Current

Note 1:

All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

Note 2:

Thermal derating graphs are developed in free air convection cooling of 40-60 LFM soldered in a printed circuit board. (See Thermal Application Notes.)

(See Note 2)

(See Note 2)

(See Note 2)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Vin-(Volts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Vin-(Volts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Vin-(Volts)

40

50

60

70

80

90

100

0

0.25

0.5

0.75

1

1.25

1.5

9V

10.0V

15.0V

20.0V

25.0V

30.0V

Vin

0

10

20

30

40

50

60

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

25.0V

20.0V

15.0V

10.0V

9V

Vin

0

0.5

1

1.5

2

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

25.0V

20.0V

15.0V

10.0V

9V

Vin

40

50

60

70

80

90

100

0

0.25

0.5

0.75

1

1.25

1.5

16.0V

20.0V

25.0V

30.0V

Vin

0

0.5

1

1.5

2

2.5

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

25.0V

20.0V

16.0V

Vin

40

50

60

70

80

90

100

0

0.25

0.5

0.75

1

1.25

1.5

19.0V

21.0V

24.0V

27.0V

30.0V

Vin

0

30

60

90

120

150

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

27.0V

24.0V

21.0V

19.0V

Vin

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

7

9 11 13 15 17 19 21 23 25 27 29 31

60˚C

70˚C

85˚C

50˚C

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

15

17

19

21

23

25

27

29

31

60˚C

70˚C

85˚C

50˚C

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

18

20

22

24

26

28

30

60˚C

70˚C

85˚C

50˚C

0

20

40

60

80

100

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

25.0V

20.0V

16.0V

Vin

0

0.5

1

1.5

2

2.5

0

0.25

0.5

0.75

1

1.25

1.5

30.0V

27.0V

24.0V

21.0V

19.0V

Vin

PT79SR100 Series

-1.5 Amp Negative Step-Down

Integrated Switching Regulator