PT6921 datasheet(1/5 Pages) TI

Part #	PT6921

Description	5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT INTEGRATED SWITCHING REGULATOR

PDF	5 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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1 / 5 page

For assistance or to order, call (800) 531-5782

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com

PT6920

Series

Standard Application

5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT

INTEGRATED SWITCHING REGULATOR

Ordering Information

PT6921t

t

t = +3.3 Volts

+2.5/+1.8 Volts

PT6922t

t

t = +3.3 Volts

+1.5 Volts

C1 = Req’d 560µF electrolytic

C2 = Req’d 330µF electrolytic

C3 = Optional 100µF electrolytic

Features

• Dual Outputs:

+3.3V/6A

+2.5V/2.2A or +1.8V/1.5A

• Adjustable Output Voltage

• Remote Sense (both outputs)

• Standby Function

• Over-Temperature Protection

• Soft-Start

• Internal Sequencing

• 23-pin SIPPackage

Pin Function

1V1 Remote Sense

2

Do Not Connect

3

STBY

4Vin

5Vin

6Vin

7

GND

8

GND

9

GND

10

GND

11

GND

12

V1out

Function

13

V1out

14

V1out

15

V1out

16

V1 Adjust

17

Do Not Connect

18

V2out

19

V2out

20

V2out

21

V2out

22

V2 Remote Sense

23

V2 Adjust*

Pin-Out Information

The PT6920 is a new series of 25W

dual output ISRs designed to power the

latest generation DSP chips. Both out-

put voltages are independently adjustable

with external resistors. In addition, the

second output voltage of the PT6921 can

be selected for 2.5V or 1.8V to accom-

modate the next generation of DSP

chips. The internal power sequencing of

both outputs meet the latest require-

ments of TI’s ‘C6000 series DSPs.

(For dimensions and PC board layout,

see Package Styles 1100 and 1110.)

PT6920

C2

+

GND

V1

OUT

V

IN

GND

4,5,6

7-11

12-15

18-21

16

C1

22

C3

+

23

1

V2

OUT

R1

R2

R3

R4

V2 Sense

V1 Sense

3

STBY

PT Series Suffix (PT1234X)

Case/Pin

Configuration

Vertical Through-Hole

N

Horizontal Through-Hole

A

Horizontal Surface Mount

C

Preliminary Specifications

Characteristics

PT6920 SERIES

(T

a= 25°C unless noted)

Symbols

Conditions

Min

Typ

Max

Units

Output Current

Io

Ta = +60°C, 200 LFM, pkg N

V1 = 3.3V

0.1

—

5.5

A

V2 = 2.5V

0

—

2.2

A

V2 = 1.8V

0

—

1.75

A

V2 = 1.2V

0

—

1.2

A

Ta = +25°C, natural convection V1 = 3.3V

0.1

—

6.0

A

V2 = 2.5V

0

—

2.2

A

V2 = 1.8V

0

—

1.75

A

V2 = 1.2V

0

—

1.2

A

Input Voltage Range

Vin

0.1A

≤ Io ≤ Imax

4.5

—

5.5

V

Output Voltage Tolerance

∆Vo

Vin = +5V, Io = Imax, both outputs

Vo-0.1

—

Vo+0.1

V

0°C

≤ Ta ≤ +65°C

Line Regulation

Regline

4.5V

≤ Vin ≤ 5.5V, Io = Imax

V1 = 3.3V

—

±7

±17

mV

V2 = 2.5V

—

±7

±13

mV

Load Regulation

Regload

Vin = +5V, 0.1 ≤ Io ≤ Imax

V1 = 3.3V

—

±17

±33

mV

V2 = 2.5V

—

±4

±10

mV

Vo Ripple/Noise

Vn

Vin = +5V, Io = Imax

V1 = 3.3V

—

50

—

mV

V2 = 2.5V

—

25

—

mV

Transient Response

ttr

Io step between 0.5xImax and Imax

—

25

—

µSec

with C2 = 330µF

Vos

Vo over/undershoot

V1 = 3.3V

—

60

—

mV

V2 = 2.5V

—

60

—

mV

Efficiency

η

Vin = +5V, Io = 4A total

—

75

—

%

Switching Frequency

ƒo

4.5V

≤ Vin ≤ 5.5V

475

600

725

kHz

0.1A

≤ Io ≤ Imax

Absolute Maximum

Ta

—

0

—

+85

°C

Operating Temperature Range

Recommended Operating

Ta

Forced airflow = 200 LFM

0

—

+65

°C

Temperature Range

Over Vin and Io Ranges

Storage Temperature

Ts

—

-40

—

+125

°C

Weight

—

Vertical/Horizontal

—

29

—

grams

Note: The PT6920 series requires a 560µF electrolytic capacitor on the input and a 330µF electrolytic capacitor on the output for proper operation in all applications.

* This product is the subject of one or more patents. Other patents pending.

Note: for PT6921 only:

with pin 23 open, V2out=2.5V

with pin 23 shorted to pin 22, V2out=1.8V

Patent Pending*

Revised 3/9/99

Application Notes

Mechanical Outline

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