PT79SR100 Datasheet, PDF (2/3 Pages) Texas Instruments – -1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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PT79SR100 S e r i e s
CHARACTERISTIC DATA
PT79SR105, -5.0 VDC (See Note 1)
PT79SR112, -12.0 VDC (See Note 1)
PT79SR115, -15.0 VDC (See Note 1)
Efficiency vs Output Current
100
90
Vin
9V
80
10.0V
70
15.0V
20.0V
60
25.0V
30.0V
50
40
0 0.25 0.5 0.75 1 1.25 1.5
Iout-(Amps)
Ripple vs Output Current
60
50
40
30
20
10
0
0 0.25 0.5 0.75 1 1.25 1.5
Iout-(Amps)
Vin
30.0V
25.0V
20.0V
15.0V
10.0V
9V
Efficiency vs Output Current
100
90
Vin
80
16.0V
20.0V
70
25.0V
60
30.0V
50
40
0
0.25 0.5 0.75 1
Iout-(Amps)
1.25 1.5
Ripple vs Output Current
100
80
Vin
30.0V
60
25.0V
40
20.0V
16.0V
20
0
0 0.25 0.5 0.75 1 1.25 1.5
Iout-(Amps)
Efficiency vs Output Current
100
90
80
70
60
50
40
0
0.25 0.5 0.75
1 1.25 1.5
Vin
19.0V
21.0V
24.0V
27.0V
30.0V
Iout-(Amps)
Ripple vs Output Current
150
120
90
60
30
0
0 0.25 0.5 0.75 1 1.25 1.5
Iout-(Amps)
Vin
30.0V
27.0V
24.0V
21.0V
19.0V
Thermal Derating (T_a) (See Note 2)
1.6
50˚C
1.4
60˚C
1.2
70˚C
1
85˚C
0.8
0.6
0.4
0.2
0
7 9 11 13 15 17 19 21 23 25 27 29 31
Vin-(Volts)
Thermal Derating (T_a) (See Note 2)
1.6
50˚C
1.4
60˚C
1.2
70˚C
1
0.8
85˚C
0.6
0.4
0.2
0
15 17 19 21 23 25 27 29 31
Vin-(Volts)
Thermal Derating (T_a) (See Note 2)
1.6
50˚C
1.4
60˚C
1.2
1
70˚C
0.8
0.6
85˚C
0.4
0.2
0
18
20
22
24
26
28
30
Vin-(Volts)
Power Dissipation vs Output Current
2
Vin
1.5
30.0V
25.0V
20.0V
1
15.0V
10.0V
0.5
9V
0
0 0.25 0.5 0.75 1 1.25 1.5
Iout-(Amps)
Power Dissipation vs Output Current
2.5
2
Vin
30.0V
1.5
25.0V
20.0V
1
16.0V
0.5
0
0 0.25 0.5 0.75
1 1.25 1.5
Iout-(Amps)
Power Dissipation vs Output Current
2.5
Vin
2
30.0V
1.5
27.0V
24.0V
1
21.0V
19.0V
0.5
0
0 0.25 0.5 0.75
1 1.25 1.5
Iout-(Amps)
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.)
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