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

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 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) op-

eration. 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 out-

put 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 5V Input 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

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)

SLTS032A

(Revised 6/30/2000)