20

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

30 WATT POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

PT3300

Series

Standard Application

Cin = Optional 100µF/100V electrolytic

Cout = Required 330µF electrolytic

Note: Pins 4,5,6 and pins 10,11,12,13 are

connected internally.

Ordering Information

PT3301

o = +3.3 Volts

PT3302

o = +5.0 Volts

PT3303

o = +12.0 Volts

PT3304

o = +15.0 Volts

PT3300

7-9

4-6

14-17

V

IN

V

V

O

C

OUT

+

C

IN

+

19

REMOTE SENSE

10-13

2

LOAD

V

3

V

Inhibit

20V to 60V

Features

Pin-Out Information

Pin

Function

1

Do Not Use

2

Inhibit

10

11

12

13

14

15

16

17

18

Do Not Use

19

Remote Sense

The PT3300 is a new series of high-

input voltage, 30 Watt, non-isolated

Integrated Switching Regulators (ISRs)

housed in a 19-pin SIP package. The 20

to 60 V input range allows easy integra-

tion into many distributed power

applications which utilize 24, 28, or 48V

bus architechures.

The PT3300 series is available with

3.3, 5, 12, or 15V outputs. The output

voltage is adjustable from 90 to 110% of

nominal with the addition of an external

resistor. Other easy to use features include

an inhibit function and remote sense

which automatically compensates for any

voltage drop from the ISR to the load. As

with other Power Trends’ products, the

PT3300 includes built in current limit,

short circuit protection and over-tempera-

ture shutdown.

The PT3300 requires a 330µF output

capacitor for proper operation.

(For dimensions and PC

board layout, see Package

Styles 820 and 830.)

Case/Pin

Configuration

Vertical Through-Hole

N

Horizontal Through-Hole

A

Horizontal Surface Mount

C

Specifications

Characteristics

PT3300 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

0.50*

—

8.0

A

0.50*

—

6.0

A

0.25*

—

2.5

A

0.20*

—

2.0

A

Short Circuit Current

—

2

——

Input Voltage Range

0.5

20

—

60

V

Output Voltage Tolerance

—±1

±3

0°C

Line Regulation

—

±0.5

±1

Load Regulation

0.5

—

±0.5

±1

90

—

110

V

—

Transient Response

25% load change

—

100

250

µSec

—

2

5

Efficiency

η

—

80

—

%

—

85

—

%

—

87

—

%

Switching Frequency

600

750

900

kHz

Absolute Maximum

-20

—

+85

°C

Operating Temperature Range

Recommended Operating

Free air convection

-20

—

+65**

°C

Temperature Range

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,

—10

—

G’s

20-2000 Hz, soldered in a PC board

Weight

—

—

—

35

—

grams

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

Note: The PT3300 Series requires a 330µF electrolytic or tantalum output capacitor for proper operation in all applications.