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PT78ST100 Datasheet(PDF) 2 Page - Texas Instruments

Part No. PT78ST100
Description  1.5 Amp Positive Step-Down Integrated Switching Regulator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Typical Characteristics
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
913
17
21
25
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
9
12
1518212427
30333639
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
16
19
22
25
28
31
34
37
40
PT78ST133, 3.3 VDC
(See Note 1)
PT78ST105, 5.0 VDC (See Note 1)
PT78ST112, 12.0 VDC
(See Note 1)
Efficiency vs Output Current
Ripple vs Output Current
Thermal Derating (Ta)
(See Note 2)
Power Dissipation vs Output Current
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Vin-(Volts)
Vin-(Volts)
Vin-(Volts)
40
50
60
70
80
90
100
0
0.25
0.5
0.75
1
1.25
1.5
9.0V
12.0V
15.0V
20.0V
26.0V
Vin
40
50
60
70
80
90
100
0
0.25
0.5
0.75
1
1.25
1.5
16.0V
18.0V
24.0V
30.0V
38.0V
Vin
0
50
100
150
200
250
300
0
0.25
0.5
0.75
1
1.25
1.5
38.0V
30.0V
24.0V
18.0V
16.0V
Vin
0
20
40
60
80
100
00.25
0.5
0.7511.25
1.5
26.0V
20.0V
15.0V
12.0V
9.0V
Vin
0
0.5
1
1.5
2
2.5
3
0
0.25
0.5
0.75
1
1.25
1.5
38.0V
30.0V
24.0V
18.0V
16.0V
Vin
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
00.25
0.5
0.7511.25
1.5
26.0V
20.0V
15.0V
12.0V
9.0V
Vin
85°C
60°C
70°C
85°C
85°C
70°C
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. (See Thermal Application Notes.)
40
50
60
70
80
90
100
0
0.25
0.5
0.75
1
1.25
1.5
9.0V
12.0V
18.0V
24.0V
30.0V
38.0V
Vin
0
30
60
90
120
150
0
0.25
0.5
0.75
1
1.25
1.5
38.0V
30.0V
24.0V
18.0V
12.0V
9.0V
Vin
0
0.5
1
1.5
2
2.5
0
0.25
0.5
0.75
1
1.25
1.5
38.0V
30.0V
24.0V
18.0V
12.0V
9.0V
Vin
60°C
70°C
60°C
Efficiency vs Output Current
Efficiency vs Output Current
Ripple vs Output Current
Ripple vs Output Current
Thermal Derating (Ta)
(See Note 2)
Thermal Derating (Ta)
(See Note 2)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
1.5 Amp Positive Step-Down
Integrated Switching Regulator
PT78ST100 Series




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