Datasheet PT7772A, PT7772C, PT7772N Datasheet (Texas Instruments)

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Series

Standard Application

Cin= Required 2400µF electrolytic C

out

= Required 2400µF electrolytic

L1 = Optional 1µH input choke

32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR

PT7772

The PT7772 is a new series of high-performance, 32 Amp Integrated Switching Regulators (ISRs) housed in a 27-pin SIP package. The 32A capability allows easy integration of the latest high-speed, low-voltage µPs, ASICs, DSPs, and bus drivers into existing 3.3V systems.

The output voltage of the PT7772

can be easily programmed from 1.3V to 2.05V with a 4-bit input compatible with Intel’s Pentium



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

2400µF of output capacitance

are required for proper operation.

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

Pin-Out Information

PT7772

7 - 11

13 - 19

20 - 25

GND

1µH

GND

OUT

261

SYNC OUT

LOAD

REMOTE SENSE (+)

REMOTE SENSE (-)

VID1 VID2 VID3

PROGRAMMING PINS

234

STBY*

VID0

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

Pin Function

1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 Do not connect 7 V

8 V

9 V

10 V

11 V

12 Remote Sense Gnd 13 GND

Pin Function

14 GND 15 GND 16 GND 17 GND

18 GND 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

PT7772 SERIES

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

Output Current I

Ta = +60°C, 200 LFM, pkg N 0.1

(1)

—32A

Ta = +25°C, natural convection 0.1

(1)

—26A

Input Voltage Range V

0.1A ≤ I

≤ 32A 3.1

(2)

— 3.6 V

Output Voltage Tolerance ∆V

= +3.3V, Io = 32A

o-0.03 — Vo+0.03 V

0°C ≤ Ta ≤ +55°C

Line Regulation Reg

line

3.1V ≤ V

≤ 3.6V, I

= 32A — ±10 — mV

Load Regulation Reg

load

Vin = +3.3V, 0.1 ≤ I

≤ 32A — ±10 — mV

Vo Ripple/Noise pk-pk V

= +3.3V, Io = 32A — 50 — mV

Transient Response t

Io step between 16A and 32A — 100 — µSec

with C

out

= 2400µF V

Vo over/undershoot — 200 — mV

Efficiency η V

= +3.3V, Io = 20A, Vo = 1.8V — 90 — %

Switching Frequency ƒ

3.1V ≤ V

≤ 3.6V

650 700 750 kHz

0.1A ≤ I

≤ 32A

Absolute Maximum T

— 0 — +85 °C

Operating Temperature Range Recommended Operating T

Forced Air Flow = 200 LFM

0 — +65 °C

Temperature Range Over V

in and Io

Ranges

Storage Temperature T

— -40 — +125 °C

Weight — Vertical/Horizontal — 53/66 — grams

(1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected. (2) The minimum input voltage is 3.1V or V

out

+1.2V, whichever is greater.

Output Capacitors:

The PT7772 series requires a minimum output capacitance of 2400µF for proper operation. Do not use Oscon type capacitors.

The maximum allowable output capacitance is 30,000µF.

Input Filter:

An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.

Revised 7/15/98

Ordering Information

PT7772

❏❏

❏ = 1.3 to 2.05 Volts

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 0 0 0 0 2.05V

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.

For dimensions and PC board layout, see Package Style 1020 and 1030

• +3.3V input

• 5-bit Programmable:

1.3V to 2.05V@32A

• High Efficiency

• Input Voltage Range:

3.1V to 3.6V

• Differential Remote

Sense

• 27-pin SIP Package

Features

Efficiency vs Output Current (@Vout=+1.8V)

EfEf

ficiency (%)ficiency (%)

ficiency (%)

Output CurOutput Cur

Output Cur

ent (A)ent (A)

ent (A)

Safe Operating Area (@Vin=+3.3V, Vout=+1.8V, Pkg N)

Output CurOutput Cur

Output Cur

ent (A)ent (A)

ent (A)

Ambient TAmbient T

Ambient T

emperaturemperatur

emperatur

e (°C)e (°C)

e (°C)

Airflow

Recommended Maximum

Operating Temperature

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

Power Dissipation vs Output Current (@Vout=+1.8V)

Pd (WPd (W

Pd (W

atts)atts)

atts)

Output CurOutput Cur

Output Cur

ent (A)ent (A)

ent (A)

Output Ripple vs Output Current (@Vout=+1.8V)

Ripple (mVpp)Ripple (mVpp)

Ripple (mVpp)

Output CurOutput Cur

Output Cur

ent (A)ent (A)

ent (A)

Vin

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

3.3V Bus Products

DATA SHEETS

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

CHARACTERISTIC DATA

Series

PT7772

PT Series Suffix

(PT1234X)

Case/Pin Configuration

Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C

100

0 4 8 12 16 20 24 28 32

4.5V

5.0V

5.5V

0 4 8 121620242832

4.5V

5.0V

5.5V

0 4 8 12 16 20 24 28 32

4.5V

5.0V

5.5V

0 4 8 12 16 20 24 28 32

Nat. Conv 60 LFM 120 LFM 200 LFM

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Datasheet PT7772A, PT7772C, PT7772N Datasheet (Texas Instruments)

Specifications and Main Features

Frequently Asked Questions

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