24

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

PT6400

Standard Application

Ordering Information

PT6404

¨ = +1.5 Volts

PT6405

¨ = +3.3 Volts

PT6406

¨ = +1.8 Volts

PT6407

¨ = +2.1 Volts

PT6408

¨ = +1.2 Volts

PT6409

¨ = +2.5 Volts

Case/Pin

Configuration

Vertical Through-Hole

P

Horizontal Through-Hole

D

Horizontal Surface Mount

E

Pin

Function

1

Do not connect

5

GND

6

GND

7

GND

8

GND

10

11

12

The PT6400 is a high performance

+5V to +3.3V, 3 Amp, 12-Pin SIP (Single

In-line Package) Integrated Switching

Regulator (ISR) designed for stand alone

(not parallelable) operation. This high-

performance ISR allows easy integration

of low-power 3.3V logic IC’s into existing

5V systems without redesigning the central

power supply. Only two external capacitors

are required for proper operation. The

output voltage is easily adjustable with one

external resistor. The PT6406,7,8 can be

used to terminate high-speed data buses

such as Futurebus (+2.1V) or the new GTL

(+1.2V) logic buses.

Please note that this product does not

include short circuit protection.

3 AMP ADJUSTABLE

INTEGRATED SWITCHING REGULATOR

PT6400

Series

Pin-Out Information

Note: Back surface

of product is

conducting metal.

Specifications

Characteristics

PT6400 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

4.5V

0.1*

—

3.0

A

Current Limit

—

3.6

5.0

A

Input Voltage Range

0.1A

4.5

—

5.5

V

Output Voltage Tolerance

—

V

0°C

Line Regulation

4.5V

—

±10

±25

mV

Load Regulation

—

±10

±25

mV

—

66

165

mV

Transient Response

—

200

—

µSec

—

200

—

mV

Efficiency

η

—

85

—

%

—

74

—

%

—

77

—

%

—

63

—

%

Switching Frequency

4.5V

500

650

800

kHz

0.3A

Absolute Maximum

0—

+85

°C

Operating Temperature Range

Recommended Operating

Free Air Convection (40-60 LFM)

0

—

+ 70**

°C

Temperature Range

Thermal Resistance

θ

ja

Free Air Convection (40-60 LFM)

—

25

—

°C/W

Storage Temperature

—

-40

—

+125

°C

Mechanical Shock

Per Mil-STD-883D, Method 2002.3 , 1 msec,

—

500

—

G’s

Half Sine, mounted to a fixture

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2,

20-2000 Hz, Soldered in a PC board

—15

—

G’s

Weight

—

—

—

6.5

—

grams

*ISR will operate down to no load with reduced specifications

**See Thermal Derating chart.

Note: The PT6400 Series requires two 100µF electrolytic or tantalum capacitors for proper operation in all applications.

Pkg Style 300

PT6400

C2

100µF

+

COM

V

OUT

2,3,4

5,6,7,8

9,10,11

12

C1

100µF

+

V

IN

COM

R1

(V

O

UP)

R2

(V

O

DOWN)