Standard Application

For STBY* pin; open = output enabled; ground = output

disabled.

Pin-Out Information

Pin Function

1

VID0

2

VID1

3

VID2

4

VID3

5

STBY* - Stand-by

6

VID4

Pin Function

10

11

12

Remote Sense Gnd

13

GND

14

GND

15

GND

16

GND

17

GND

18

GND

PT7707

The PT7707 is a new series of

high-performance, 18 Amp Integrated

Switching Regulators (ISRs) housed in

a 27-pin SIP package. The 18A capa-

bility allows easy integration of the

latest high-speed, low-voltage µPs and

bus drivers into existing 5V systems.

The PT7707 series has been de-

signed to work in parallel with one or

more of the PT7749 - 18A current

ments of 18A.

The output voltage of the PT7707

can be easily programmed from 1.3V

to 3.5V with a 5 bit input compatible

A differential remote sense is also pro-

vided which automatically compensates

for any voltage drop from the ISR to

the load.

Only 330µF of output capacitance

are required for proper operation.

Cin = Required 1200µF electrolytic

Cout= Required 330µF electrolytic

L1 = Optional 1µH input choke

Pin Function

19

GND

20

21

22

23

24

25

26

27

Sync Out

Specifications

Characteristics

PT7707 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

A

A

Input Voltage Range

0.1A

—

5.5

V

Output Voltage Tolerance

—

V

0°C

Line Regulation

4.5V

—

±10

—

mV

Load Regulation

—

±10

—

mV

—

50

—

mV

Transient Response

—

100

—

µSec

—

200

—

mV

Efficiency

η

—

89

—

%

—

87

—

%

—

85

—

%

—

79

—

%

—

77

—

%

Switching Frequency

4.5V

650

700

750

kHz

0.1A

Absolute Maximum

—0

—

+85

°C

Operating Temperature Range

Recommended Operating

Forced Air Flow = 200 LFM

0

—

+65****

°C

Temperature Range

Storage Temperature

—

-40

—

+125

°C

Mechanical Shock

Per Mil-STD-883D, Method 2002.3

1 msec, Half Sine, mounted to a fixture

—

500

—

G’s

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2,

—10

—

G’s

20-2000 Hz, Soldered in a PC board

Weight

—

Vertical/Horizontal

—

31/41

—

grams

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

**The PT7707 series can be easily paralleled with one or more of the PT7749 Current Boosters to provide increased output current in increments of 18A.

****See SOA curves.

Output Capacitors: The PT7707 series requires a minimum ouput capacitance of 330µF for proper operation. Do not use Oscon type capacitors. The maximum allow-

able output capacitance is 15,000µF.

Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 18ADC with a typical value of 1µH. The input capacitance must be

rated for a minimum of 1.3Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.

Revised 7/24/98

PT7705

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

PT7707

18 AMP “BIG-HAMMER” PROGRAMMABLE

INTEGRATED SWITCHING REGULATOR

Series