PT7720

7 - 11

13 - 19

20 - 25

27

V

IN

GND

1µH

GND

V

OUT

C

OUT

+

C

IN

+

12

26

1

L1

SYNC OUT

LOAD

REMOTE SENSE (+)

REMOTE SENSE (-)

VID1

VID2

VID3

VID4

PROGRAMMING PINS

2

3

4

STBY*

5

6

VID0

50

Pin-Out Information

Pin Function

1

VID0

2

VID1

3

VID2

4

VID3

5

STBY* - Stand-by

6

VID4

10

11

12

Remote Sense Gnd

13

GND

14

GND

Pin Function

15

GND

16

GND

17

GND

18

GND

19

GND

20

21

22

23

24

25

26

Remote Sense

27

Sync Out

Standard Application

Cin = Required 560µF electrolytic

(See input filter note)

Cout = Required 1200µF electrolytic

L1

= Optional 1µH input choke

For STBY* pin:

open = output enabled

ground = output disabled.

1.3V to 3.5V or

4.5V to 7.6V

17A current boosters

Features

Series

17 AMP 12V INPUT “BIG-HAMMER II” PRO-

GRAMMABLE ISR

PT7720

The PT7720 series is a new +12V input,

17A output, high-performance Integrated

Switching Regulator (ISR) housed in a 27-

pin SIP package. The 17A capability allows

easy integration of the latest high-speed,

low-voltage µPs and bus drivers into +12V

distributed power systems.

The PT7720 series has been designed

to work in parallel with one or more of the

in increments of 17A.

The output voltage of the PT7721 can

be easily programmed from 1.3V to 3.5V

with a 5 bit input compatible with Intel’s

mote sense is also provided which

automatically compensates for any voltage

drop from the ISR to the load.

1200µF of output capacitance is re-

quired for proper operation.

Output Capacitors:

The PT7720 series requires a minimum output capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance

Input Filter:

An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1µH. The input capacitance must be rated for a

minimum of 4.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engineer for input capacitor selection for applications

at other output voltages and output currents.

Specifications

Characteristics

PT7720 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

A

A

Output Power

—

—

85

Watts

—

—

85

Watts

Input Voltage Range

0.1A

11.0

—

14.0

V

Output Voltage Tolerance

(PT7721)

—

V

0°C

(PT7722)

—

±1.0%

±2.0%

Line Regulation

11V

—

±5

±10

mV

Load Regulation

—

±5

±10

mV

(PT7721)

—

50

—

mVpp

(PT7722)

—

100

—

mVpp

Transient Response

—

100

—

µSec

—

200

—

mV

Efficiency

η

—

90

—

%

—

88

—

%

—

85

—

%

—

78

—

%

Switching Frequency

11V

300

350

400

kHz

0.1A

Absolute Maximum

—0

—

+85

°C

Operating Temperature Range

Recommended Operating

Forced Air Flow = 200 LFM

0—

°C

Temperature Range

Storage Temperature

—

-40

—

+125

°C

Mechanical Shock

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

—

TBD

—

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

—

TBD

—

G’s

Weight

—

Vertical/Horizontal

—

51/64

—

grams

*

ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.

** The PT7720 series can be easily paralleled with one or more of the PT7748 Current Boosters to provide increased output current in increments of 17A.

*** See Safe Operating Area chart.

Revised 1/13/99

Application Notes

Mechanical Outline

Product Selector Guide