16

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

2 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

PT78HT200 Series

Standard Application

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Pin-Out Information

Pin

Function

2

GND

Ordering Information

PT78HT2

Output Voltage

XX

Y

33

= 3.3 Volts

05

= 5.0 Volts

53

= 5.25 Volts

65

= 6.5 Volts

Package Suffix

V

= Vertical Mount

S

= Surface Mount

H

= Horizontal

Mount

This is the new generation of the

PT78HT200 Series wide input range

3 terminal regulators. These ISRs have

a maximum output current of 2.0 Amps.

The output voltage is laser trimmed

for high accuracy.

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.

PT78HT200

C2

+

Vout

COM

COM

Vin

C1

1

2

3

Pkg Style 500

Specifications

Characteristics

PT78HT200 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

0.1*

—

2.0

A

Short Circuit Current

—

6.0

—

Apk

Input Voltage Range

0.1

9

—

15

V

9

—

28

V

10.5

—

28

V

Output Voltage Tolerance

—

±1.0

±2.0

%Vo

Line Regulation

—

±0.4

±0.8

Load Regulation

0.1

—

±0.2

±0.4

—

±1

—

%Vo

Transient Response

50% load change

—

100

—

µSec

(with 100µF output cap)

5.0

Efficiency

η

—

80

—

%

Switching Frequency

700

750

800

kHz

950

1,000

1,050

kHz

Absolute Maximum

—

-40

—

+85

°C

Operating Temperature Range

Recommended Operating

Free Air Convection, (40-60LFM)

-40

—

+75**

°C

Temperature Range

Thermal Resistance

θ

ja

Free Air Convection, (40-60LFM)

—

40

—

°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 PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.