TEXAS INSTRUMENTS PT78ST100 Technical data

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PT78ST100 Series

1.5 Amp Positive Step-Down
Integrated Switching Regulator

SLTS059A

(Revised 6/30/2000)

• Very Small Footprint

• High Efficiency > 85%

• Self-Contained Inductor

• Internal Short-Circuit Protection

• Over-Temperature Protection

• Fast Transient Response

• Wide Input Range

These ISRs have a maximum output current
of 1.5 Amps and an output voltage that is laser
trimmed to a variety of industry standard volt­ages.

These 78 series regulators have excel­lent line and load regulation with internal
short- circuit and over-temperature protec­tion, and are offered in a variety of standard

The PT78ST100 is a series of wide-

input range, 3-terminal regulators.

output voltages. These ISRs are very flex­ible and may be used in a wide variety of
applications.

Pin-Out Information

Pin Function

1V

in

Standard Application

C2

Vout

+

COMCOM

Vin

C1

1

C1 = Optional 1µF ceramic
C2

= Required 100µF electrolytic

PT78ST100

2

3

Specifications

Characteristics
(Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units

Output Current I

Short Circuit Current I

Input Voltage Range V

Output Voltage Tolerance ∆V

Line Regulation Reg

Load Regulation Reg

Ripple/Noise V

V

o

Transient Response t
(with 100µF output cap) Vo over/undershoot — 5 — %V

Efficiency η V

Switching Frequency ƒ

Absolute Maximum T
Operating Temperature Range

Recommended Operating T
Temperature Range At Vin= 24V, Io=1.0A

Thermal Resistance θ

Storage Temperature T

Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s

Mechanical Vibration — Per Mil-STD-883D, Method 2007.2,

Weight — — — 6.5 — grams

*ISR will operate down to no load with reduced specifications. **See Thermal Derating chart.

Note:

The PT78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.

o

sc

in

o

line

load

n

tr

o

a

a

ja

s

2 GND

3V

out

Pkg Style 500

Over Vin range 0.1* — 1.5 A

Vin = V

min — 3.5 — Apk

in

0.1 ≤ Io ≤ 1.5A V

Over Vin range, Io=1.5A

Ta = 0°C to +60°C

Over Vin range — ±0.2 ±0.4 %V

0.1 ≤ Io ≤ 1.5A — ±0.1 ±0.2 %V

Vin= 9V, Io= 1.5A Vo= 5V — 65 — mV
Vin= 16V, Io= 1.5A Vo= 12V 90 mV

50% load change — 100 — µSec

= 10V, Io= 1A Vo= 3.3V — 80 — %

in

= 10V, Io= 1A Vo= 5V — 85 — %

V

in

Vin= 17V, Io= 1A Vo= 12V — 90 — %

Over Vin range, Io=1.5A 600 650 700 kHz

—

Free Air Convection, (40-60LFM)

Free Air Convection, (40-60LFM) — 45 — °C/W

— -40 — +125 °C

20-2000 Hz, soldered in a PC board

= 3.3V 9 — 26 V

o

V

= 5V 9 — 38 V

o

Vo= 12V 16 — 38 V

Ordering Information

PT78ST1

Output Voltage

33 = 3.3 Volts
36 = 3.6 Volts
05 = 5.0 Volts
51 = 5.1 Volts
53 = 5.25 Volts
06 = 6.0 Volts
65 = 6.5 Volts
07 = 7.0 Volts
08 = 8.0 Volts
09 = 9.0 Volts
10 = 10.0 Volts
12 = 12.0 Volts
14 = 13.9 Volts
15 = 15.0 Volts

PT78ST100 SERIES

— ±1.0 ±2.0 %V

-40 — +85 °C

-40 — +80** °C

—5

XX Y

Package Suffix

V = Vertical Mount
S = Surface Mount
H = Horizontal

Mount

—

G’s

o

o

o

pp
pp

o

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

PT78ST100 Series

Typical Characteristics

1.5 Amp Positive Step-Down
Integrated Switching Regulator

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 Efficiency vs Output Current

100

90

80

70

60

Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts)

50

40

0 0.25 0.5 0.75 1 1.25 1.5

Iout-(Amps)

Vin

9.0V

12.0V

15.0V

20.0V

26.0V

100

90

80

70

Efficiency - %

60

50

40

0 0.25 0.5 0.75 1 1.25 1.5

Iout-(Amps)

Ripple vs Output Current Ripple vs Output Current

100

80

60

40

20

0

00.250.50.7511.251.5

Iout-(Amps)

Thermal Derating (T

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

913172125

) (See Note 2) Thermal Derating (Ta) (See Note 2)

a

60°C

70°C

85°C

Vin-(Volts) Vin-(Volts)Vin-(Volts)

Vin

26.0V

20.0V

15.0V

12.0V

9.0V

150

120

90

60

Ripple-(mV)

30

0

0 0.25 0.5 0.75 1 1.25 1.5

Iout-(Amps)

1.6

1.4

1.2

1

0.8

0.6

Iout-(Amps)

0.4

0.2

0

9 12151821242730333639

85°C

70°C

60°C

Efficiency vs Output Current

100

Vin

9.0V

12.0V

18.0V

24.0V

30.0V

38.0V

90

80

70

Efficiency - %

60

50

40

0 0.25 0.5 0.75 1 1.25 1.5

Vin

16.0V

18.0V

24.0V

30.0V

38.0V

Iout-(Amps)

Ripple vs Output Current

300

250

Vin

38.0V

30.0V

24.0V

18.0V

12.0V

9.0V

200

150

100

50

Ripple-(mV)Iout-(Amps)

0

0 0.25 0.5 0.75 1 1.25 1.5

Iout-(Amps)

Thermal Derating (T

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

16 19 22 25 28 31 34 37 40

85°C

) (See Note 2)

a

70°C

60°C

Vin

38.0V

30.0V

24.0V

18.0V

16.0V

Power Dissipation vs Output Current Power Dissipation vs Output Current

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

00.250.50.7511.251.5

Vin

26.0V

20.0V

15.0V

12.0V

9.0V

2.5

2

1.5

1

PD-(Watts)

0.5

0

0 0.25 0.5 0.75 1 1.25 1.5

Vin

38.0V

30.0V

24.0V

18.0V

12.0V

9.0V

Power Dissipation vs Output Current

3

2.5

2

1.5

1

PD-(Watts)

0.5

0

0 0.25 0.5 0.75 1 1.25 1.5

Iout-(Amps) Iout-(Amps) 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. (See Thermal Application Notes.)

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

Vin

38.0V

30.0V

24.0V

18.0V

16.0V

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