32 Amp Sledge Hammer Programmable ISR - Octopart

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PT7771—5V 32 Amp “Sledge Hammer” Programmable ISR SLTS054A (Revised 6/30/2000) The PT7771 is a high-output Integrated Switching Regulator (ISR) hous...

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PT7771—5V 32 Amp “Sledge Hammer” Programmable ISR

SLTS054A (Revised 6/30/2000)

The PT7771 is a high-output Integrated Switching Regulator (ISR) housed in a 27-pin SIP package. The PT7771 operates off a standard 5V bus to provide a 32 amp low-voltage power source for the industry’s latest highspeed µPs, ASICs, DSPs. The PT7771 has been designed to work in parallel with one or more of the PT7746 -32A current boosters to increase the load current capability in increments of 32A.

The output voltage is programmable from 1.3V to 3.5V via a 5-bit input, compatible with Intel’s Pentiumâ Pro Processor. A differential remote sense is also provided to compensate for voltage drop between the ISR and load. An output capacitance of 2400µF is required for proper operation. Note that this product does not include short circuit protection.

Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4

VIN

REMOTE SENSE (+) 6 4 3 2 1

L1

PT7770

7 - 11

1H

C IN

+

26

27

13 - 19

5

VOUT

20 - 25

12

C OUT

+

LOAD

SYNC OUT GND

GND

STBY*

REMOTE SENSE (-)

Cin = Required 2400µF electrolytic Cout = Required 2400µF electrolytic L1 = Optional 1µH input choke

Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 VID4 7 Vin 8 Vin 9 Vin 10 Vin 11 Vin 12 Remote Sense Gnd 13 GND

Pin Function 14 GND 15 GND 16 GND 17 GND 18 19 20 21 22 23 24 25 26 27

GND GND Vout Vout Vout Vout Vout Vout Remote Sense Vout Sync Out

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

Specifications PT7771

Characteristics (T a = 25°C unless noted)

Symbols

Conditions

Min

Output Current

Io

Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection

0.1 0.1

(1) (1)

Input Voltage Range

Vin

0.1A ≤ Io ≤ 32A

4.5

(2)

Output Voltage Tolerance

∆Vo

Vin = +5V, Io = 32A 0°C ≤ Ta ≤ +55°C

Vo-0.03

Line Regulation

Regline

4.5V ≤ V in ≤ 5.5V, Io = 32A



±10



mV

Load Regulation

Regload

Vin = +5V, 0.1 ≤ I o ≤ 32A



±10



mV

Vo Ripple/Noise pk-pk

Vn

Vin = +5V, Io = 32A



50



mV

Transient Response with Cout = 2400µF

ttr Vos

Io step between 16A and 32A Vo over/undershoot

— —

100 200

— —

µSec mV

Efficiency

η

Vin = +5V, Io = 20A, V o = 3.3V



90



%

Switching Frequency

ƒo

4.5V ≤ Vin ≤ 5.5V 0.1A ≤ Io ≤ 32A

650

700

750

kHz

Absolute Maximum Operating Temperature Range

Ta

Over Vin Range

0



+85

Typ

Max

Units

— —

32 26

A A



5.5

V



Vo+0.03

V

(3)

°C

Storage Temperature

Ts



-40



+125

°C

Weight



Vertical/Horizontal



53/66



grams

Notes: (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 4.5V or Vout +1.2V, whichever is greater. (3) Consult the SOA curves or contact the factory for the appropriate derating. Output Capacitors: The PT7771 regulator 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.

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

PT7771—5V 32 Amp “Sledge Hammer” Programmable ISR

Programming Information

Features • +5V input • 5-bit Programmable: 1.3V to [email protected] • High Efficiency • Differential Remote Sense • Parallelable with PT7746 32A “Current Booster” • 27-pin SIP Package

VID3 VID2 VID1 VID0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0

1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0

1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0

Ordering Information PT7771❏ ❏ = 1.3 to 3.5 Volts

VID4=1 VID4=0 Vout Vout 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V

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

1.30V 1.35V 1.40V 1.45V 1.50V 1.55V 1.60V 1.65V 1.70V 1.75V 1.80V 1.85V 1.90V 1.95V 2.00V 2.05V

PT Series Suffix (PT1234X) Case/Pin Configuration

N A C

Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount

Logic 0 = Pin 12 potential (remote sense gnd) Logic 1 = Open circuit (no pull-up resistors) VID3 and VID4 may not be changed while the unit is operating.

T Y P I C A L PT7771 @Vin =+5V, Vout =3.3V

C H A R A C T E R I S T I C S Safe Operating Area Curves

(See Note A)

Efficiency vs Output Current 100

Vin 4.5V 5.0V 5.5V

80

70

60 0

4

8

12

16

20

24

28

Ambient TTemperature emperature (°C)

90

90

Efficiency (%)

(See Note B)

PT7771 @Vin =+5V, Vout =3.3V, Pkg N

80 70

Airflow Nat. Conv

60

60 LFM 120 LFM 200 LFM

50 40 30 20

32

0

Output Current (A)

4

8

12

16

20

24

28

32

Output Current (A)

Power Dissipation vs Output Current 20 18 16

Vin

Pd (W atts) (Watts)

14 12

4.5V

10

5.0V 5.5V

8 6 4 2 0 0

4

8

12

16

20

24

28

32

Output Current (A)

Output Ripple vs Output Current 40 35

Ripple (mVpp)

30

Vin

25

4.5V 5.0V 5.5V

20 15 10 5 0 0

4

8

12

16

20

24

28

32

Output Current (A)

Note A: All characteristic data in the above graphs has been developed from actual procducts tested at 25°C. This data is considered typical for the ISR. Note B: OA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

I MPORTANT NOTI CE Te xas Instrume nts and its subsidiarie s (TI) re se rve the right to make change s to the ir products or to discontinue any product or se rvice without notice , and advise custome rs to obtain the late st ve rsion of re le vant information to ve rify, be fore placing orde rs, that information be ing re lie d on is curre nt and comple te . All products are sold subje ct to the te rms and conditions of sale supplie d at the time of orde r acknowle dgme nt, including those pe rtaining to warranty, pate nt infringe me nt, and limitation of liability. TI warrants pe rformance of its se miconductor products to the spe cifications applicable at the time of sale in accordance with TI’s standard warranty. Te sting and othe r quality control te chnique s are utilize d to the e xte nt TI de e ms ne ce ssary to support this warranty. Spe cific te sting of all parame te rs of e ach de vice is not ne ce ssarily pe rforme d, e xce pt those mandate d by gove rnme nt re quire me nts. Custome rs are re sponsible for the ir applications using TI compone nts. In orde r to minimize risks associate d with the custome r’s applications, ade quate de sign and ope rating safe guards must be provide d by the custome r to minimize inhe re nt or proce dural hazards. TI assume s no liability for applications assistance or custome r product de sign. TI doe s not warrant or re pre se nt that any lice nse , e ithe r e xpre ss or implie d, is grante d unde r any pate nt right, copyright, mask work right, or othe r inte lle ctual prope rty right of TI cove ring or re lating to any combination, machine , or proce ss in which such se miconductor products or se rvice s might be or are use d. TI’s publication of information re garding any third party’s products or se rvice s doe s not constitute TI’s approval, warranty or e ndorse me nt the re of.

Copyright 

2000, Te xas Instrume nts Incorporate d

IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright  2000, Texas Instruments Incorporated