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

Standard Application

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Pin-Out Information

Pin

Function

2

GND

Ordering Information

PT78ST1 XX Y

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

Package Suffix

V

= Vertical Mount

S

= Surface Mount

H

= Horizontal

Mount

1.5 Amp Positive Step-Down

Integrated Switching Regulator

The PT78ST100 is a series of wide-

input range, 3-terminal regulators.

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 volt-

ages.

These 78 series regulators have excel-

lent line and load regulation with internal

short- circuit and over-temperature protec-

tion, and are offered in a variety of standard

output voltages. These ISRs are very flex-

ible and may be used in a wide variety of

applications.

PT78ST100 Series

Output Voltage

Specifications

Characteristics

PT78ST100 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

0.1*

—

1.5

A

Short Circuit Current

—

3.5

—

Apk

Input Voltage Range

0.1

9

—

26

V

9

—

38

V

16

—

38

V

Output Voltage Tolerance

—

±1.0

±2.0

%Vo

Line Regulation

—

±0.2

±0.4

%Vo

Load Regulation

0.1

—

±0.1

±0.2

%Vo

—

65

—

90

Transient Response

50% load change

—

100

—

µSec

(with 100µF output cap)

—

5

—

%Vo

Efficiency

η

—

80

—

%

—

85

—

%

—

90

—

%

Switching Frequency

600

650

700

kHz

Absolute Maximum

—

-40

—

+85

°C

Operating Temperature Range

Recommended Operating

Free Air Convection, (40-60LFM)

Temperature Range

-40

—

+80**

°C

Thermal Resistance

Free Air Convection, (40-60LFM)

—

45

—

°C/W

Storage Temperature

—

-40

—

+125

°C

Mechanical Shock

—

Per Mil-STD-883D, Method 2002.3

—

500

—

G’s

Mechanical Vibration

—

Per Mil-STD-883D, Method 2007.2,

—5

—

G’s

20-2000 Hz, soldered in a PC board

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.

PT78ST100

C2

+

Vout

COM

COM

Vin

C1

1

2

3

Pkg Style 500

SLTS059A

(Revised 6/30/2000)