Texas Instruments PT7706A, PT7706C, PT7706N Datasheet

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 Do not connect
7V

in

8V

in

9V

in

Pin Function

10 V

in

11 V

in

12 Remote Sense Gnd
13 GND
14 GND
15 GND
16 GND
17 GND
18 GND

SeriesPT7706

The PT7706 is a new series of
high-performance, 18 Amp Integrated
Switching Regulators (ISRs) housed in
a 27-pin SIP package. The 18A
capability allows easy integration of the
latest high-speed, low-voltage µPs,
DSPs, ASICs, and bus drivers into
existing 3.3V systems.

The PT7706 series has been
designed to work in parallel with one
or more of the PT7749 - 18A current

boosters for increased I

out

in increments

of 18A.

The output voltage of the PT7706
can be easily programmed with a 4 bit
input compatible with Intel’s Pentium



II Processor. A differential remote sense
is also provided which automatically
compensates for any voltage drop from
the ISR to the load.

1200µF of output capacitance are
required for proper operation.

For assistance or to order, call [phone]

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

10

Cin= Required 1200µF electrolytic
C

out

= Required 1200µF electrolytic

L1 = Optional 1µH input choke

PT7706

7 - 11

13 - 19

20 - 25

27

V

IN

GND

1µH

GND

V

OUT

C

OUT

+

C

IN

+

12

261

L1

SYNC OUT

LOAD

REMOTE SENSE (+)

REMOTE SENSE (-)

VID1
VID2
VID3

PROGRAMMING PINS

234

STBY*

5

VID0

18 AMP “BIG-HAMMER” PROGRAMMABLE
INTEGRATED SWITCHING REGULATOR

Pin Function

19 GND
20 V

out

21 V

out

22 V

out

23 V

out

24 V

out

25 V

out

26 Remote Sense V

out

27 Sync Out

Specifications

Characteristics

PT7706 SERIES

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

Output Current I

o

Ta = +60°C, 200 LFM, pkg N 0.1

*

—18**A

Ta = +25°C, natural convection 0.1

*

—15**A

Input Voltage Range V

in

0.1A ≤ I

o

≤ 15A 3.1

***

— 3.6 V

Output Voltage Tolerance ∆V

o

V

in

= +3.3V, Io = 18A

V

o-0.03 — Vo+0.03 V

0°C ≤ Ta ≤ +65°C

Line Regulation Reg

line

3.1V ≤ V

in

≤ 3.6V, I

o

= 18A — ±10 — mV

Load Regulation Reg

load

Vin = +3.3V, 0.1 ≤ I

o

≤ 18A — ±10 — mV

Vo Ripple/Noise V

n

V

in

= +3.3V, Io = 18A — 50 — mV

Transient Response t

tr

Io step between 9A and 18A — 100 — µSec

with C

out

= 1200µF V

os

Vo over/undershoot — 200 — mV

Efficiency η V

in

= +3.3V, Io = 10A Vo = 1.8V — 79 — %

V

o

= 1.5V — 77 — %

Switching Frequency ƒ

o

3.1V ≤ V

in

≤ 3.6V

650 700 750 kHz

0.1A ≤ I

o

≤ 18A

Absolute Maximum T

a

—0—+85°C

Operating Temperature Range
Recommended Operating T

a

Forced Air Flow = 200 LFM

0 — +65**** °C

Temperature Range Over V

in and Io

Ranges

Storage Temperature T

s

— -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 PT7706 series can be easily paralleled with one or more of the PT7749 Current Boosters to provide increased output current in increments of 18A.
*** The minimum input voltage is 3.1V or V

out

+1.2V, whichever is greater. ****See SOA curves.

Output Capacitors:

The PT7706 series requires a minimum ouput capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum

allowable 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 7/15/98

Application Notes

Mechanical Outline

Product Selector Guide

Programming Information

VID3 VID2 VID1 VID0 Vout

1 1 1 1 1.30V
1 1 1 0 1.35V
1 1 0 1 1.40V
1 1 0 0 1.45V
1 0 1 1 1.50V
1 0 1 0 1.55V
1 0 0 1 1.60V
1 0 0 0 1.65V
0 1 1 1 1.70V
0 1 1 0 1.75V
0 1 0 1 1.80V
0 1 0 0 1.85V
0 0 1 1 1.90V
0 0 1 0 1.95V
0 0 0 1 2.00V

• +3.3V input

• 4-bit Programmable:

1.3V to 2.05V@18A

• High Efficiency

• Input Voltage Range:

3.1V to 3.6V

• Differential Remote Sense

• 27-pin SIP Package

• Parallelable with PT7749

18A “Current Boosters”

Features

For assistance or to order, call [phone]

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

11

5V to 3.x Converters

3.3V Bus Products

DATA SHEETS

CHARACTERISTIC DATA

PT7706, Vo = 1.8 VDC (See Note 1)

Efficiency vs Output Current

Ripple vs Output Current

Power Dissipation vs Output Current

Efficiency - %Ripple-(mV)PD-(Watts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

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.

Safe Operating Area Curves (@Vin=+3.3V)

Ambient Temperature (°C)

Output Current (Amps)

Airflow

Airflow

Ambient Temperature (°C)

Output Current (Amps)

PKG SUFFIX N

Note 2:Note 2:

Note 2:Note 2:

Note 2: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

Recommended Maximum

Operating Temperature

0

10

20

30

40

50

60

0 3 6 9 121518

5.5V

5.0V

4.5V

Vin

40

50

60

70

80

90

100

0 3 6 9 12 15 18

4.5V

5.0V

5.5V

Vin

0

2

4

6

8

10

12

14

0 3 6 9 12 15 18

5.5V

5.0V

4.5V

Vin

SeriesPT7706

Ordering Information

PT7706

❏❏

❏❏

❏ = 1.3 to 2.05 Volts

(For dimensions and PC board layout,
see Package Styles 800 and 810.)

Recommended Maximum

Operating Temperature

PT7706, Vo = 1.8 VDC (See Note 1)

PKG SUFFIX A, C

PT Series Suffix

(PT1234X)

Case/Pin
Configuration

Vertical Through-Hole

N

Horizontal Through-Hole

A

Horizontal Surface Mount

C

20

30

40

50

60

70

80

90

024681012141618

Nat Conv
60LFM
100LFM
200LFM

20

30

40

50

60

70

80

90

024681012141618

Nat Conv
60LFM
100LFM
200LFM

Logic 0 = Pin 12 potential (remote sense gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID3 may not be changed while the unit is operating.