Texas Instruments PT6921C, PT6921N, PT6922A, PT6922C, PT6922N Datasheet

For assistance or to order, call [phone]

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

PT6920 Series

Standard Application

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

Ordering Information

PT6921

❏❏

❏❏

❏ = +3.3 Volts

+2.5/+1.8 Volts

PT6922

❏❏

❏❏

❏ = +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

1V

1

Remote Sense

2 Do Not Connect
3 STBY
4V

in

5V

in

6V

in

7 GND
8 GND

9 GND
10 GND
11 GND
12 V

1out

Pin Function

13 V

1out

14 V

1out

15 V

1out

16 V

1

Adjust

17 Do Not Connect
18 V

2out

19 V

2out

20 V

2out

21 V

2out

22 V

2

Remote Sense

23 V

2

Adjust*

Pin-Out Information

The PT6920 is a new series of 25W
dual output ISRs designed to power the
latest generation DSP chips. Both out­put 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 accom­modate the next generation of DSP
chips. The internal power sequencing of
both outputs meet the latest require­ments 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

(Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units

Output Current I

o

Ta = +60°C, 200 LFM, pkg N V

1

= 3.3V 0.1 — 5.5 A

V

2

= 2.5V 0 — 2.2 A

V

2

= 1.8V 0 — 1.75 A

V

2

= 1.2V 0 — 1.2 A

Ta = +25°C, natural convection V

1

= 3.3V 0 .1 — 6.0 A

V

2

= 2.5V 0 — 2.2 A

V

2

= 1.8V 0 — 1.75 A

V

2

= 1.2V 0 — 1.2 A

Input Voltage Range V

in

0.1A ≤ I

o

≤ I

max

4.5 — 5.5 V

Output Voltage Tolerance ∆V

o

V

in

= +5V, Io = I

max,

both outputs

V

o-0.1 — Vo+0.1 V

0°C ≤ Ta ≤ +65°C

Line Regulation Reg

line

4.5V ≤ V

in

≤ 5.5V, I

o

= I

max

V

1

= 3.3V — ±7 ±17 mV

V

2

= 2.5V — ±7 ±13 mV

Load Regulation Reg

load

Vin = +5V, 0.1 ≤ I

o

≤ I

max

V

1

= 3.3V — ±17 ±33 mV

V

2

= 2.5V — ±4 ±10 mV

V

o

Ripple/Noise V

n

V

in

= +5V, Io = I

max

V

1

= 3.3V — 50 — mV

V

2

= 2.5V — 25 — mV

Transient Response t

tr

Io step between 0.5xI

max

and I

max

— 25 — µSec

with C

2

= 330µF V

os

Vo over/undershoot V

1

= 3.3V — 60 — mV

V

2

= 2.5V — 60 — mV

Efficiency η V

in

= +5V, Io = 4A total — 75 — %

Switching Frequency ƒ

o

4.5V ≤ V

in

≤ 5.5V

475

600 725

kHz

0.1A ≤ I

o

≤ I

max

Absolute Maximum T

a

—

0 — +85 °C

Operating Temperature Range
Recommended Operating T

a

Forced airflow = 200 LFM

0 — +65 °C

Temperature Range Over V

in and Io

Ranges

Storage Temperature T

s

— -40 — +125 °C

Weight — Vertical/Horizontal — 29 — grams

Note:

The PT6920 series requires a 56 0µF 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

Product Selector Guide

For assistance or to order, call [phone]

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

CHARACTERISTIC DATA

PT6920 Series

Note 1:Note 1:

Note 1:Note 1:

Note 1: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

PT6921, V2out = 2.5V, I2out = 2.2A (See Note 1)

Total Efficiency vs I1out

Total Power Dissipation vs I1out

Efficiency (%)PD (Watts)

I1out (A)

I1out (A)

Vin

Vin

30

40

50

60

70

80

90

0123456

Nat conv.
60LFM
200LFM

I1out (A)

Ta (°C)

Safe Operating Area vs I1out

Recommended Maximum

Operating Temperature

40

50

60

70

80

90

100

01234 56

4.5V

5.0V

5.5V

V1out Ripple vs I1out

Ripple (mV)

I1out (A)

0

2

4

6

8

10

0123456

4.5V

5.0V

5.5V

0

10

20

30

40

50

0123456

4.5V

5.0V

5.5V

Vin