PT7778-3.3V TI1 | Alldatasheet

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For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7778—3.3V

32 Amp Programmable Integrated

+ LOAD V IN VID0 VID1 VID2 VID3 V OUT GNDGND SYNC OUT STBY* 1µH REMOTE SENSE (–) REMOTE SENSE (+) PROGRAMMING PINS PT7778 4321 2 6 20-25 125 13-1927 7-11 VoVin GND SNS (+ ) SNS (-) S ynch OutSTBY VID3 - VID0 Standard Application Cin = Required 2400µF electrolytic Cout = Required 330µF electrolytic L1 = Optional 1µH input choke

Description

The PT7778 is a high-output 32A Integrated Switching Regulator (ISR), housed in a 27-pin SIP package, The PT7778 is the 3.3V-input bus version of the PT7779. It includes short circuit protection and requires only 330µF of output capacitance for proper operation. The output voltage of the PT7778 is programmable from 1.3V to 2.05V using a 4-bit input, which is compati- ble with Intel’s Pentium  II Processors. The 32A capability provides the ideal power source for the industry’s latest high-speed, low-voltage µPs, DSPs, and custom VLSI devices. For additional current, the PT7778 may be paralleled with up to two PT7740 32A current boosters. A differential remote sense is provided to compensate for voltage drop between the ISR and load. 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 N/C

7 Vin

8 Vin

9 Vin

10 Vin

11 Vin

12 Remote Sense Gnd (3)

13 GND

14 GND

15 GND

16 GND

17 GND

18 GND

19 GND

20 Vout

21 Vout

22 Vout

23 Vout

24 Vout

25 Vout

26 Remote Sense Vout

27 Sync Out

(Revised 8/31/2000) Specifications Characteristics PT7778 (T a = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Ta = +60°C, 200 LFM, pkg N 0.1 (1) —3 2 ATa = +25°C, natural convection 0.1 (1) —3 1 Input Voltage Range V in 0.1A ≤ Io ≤ 32A 3.1 — 3.6 V Output Voltage T olerance ΔVo Vin = +3.3V , Io = 32A Vo-0.03 — V o+0.03 V–40°C ≤ Ta ≤ +85°C Line Regulation Reg line 3.1V ≤ Vin ≤ 3.6V , Io = 32A — ±10 — mV Load Regulation Reg load Vin = +3.3V, 0.1 ≤ Io ≤ 32A — ±10 — mV Vo Ripple/Noise pk-pk V n Vin = +3.3V, Io = 32A — 50 — mV T ransient Response t tr Io step between 16A and 32A — 100 — µSec with C out = 330µF V os Vo over/undershoot — 200 — mV Efficiency η Vin = +3.3V , Io = 20A, Vo = 1.8V — 90 — % Switching Frequency ƒ o 3.1V ≤ Vin ≤ 3.6V 300 350 400 kHz0.1A ≤ Io ≤ 32A Absolute Maximum T a Over Vin Range –40 — +85 (2) °COperating T emperature Range Storage T emperature T s — -40 — +125 °C Mechanical Vibration Per Mil-STD-883D, Method 2007.2 — 10/15 — G’s20-20,000Hz, Soldered in a PC board Weight — Vertical/Horizontal — 53/66 — grams Notes: (1) ISR-will operate down to no load with reduced specifications. (2) Consult the Safe Operating Area curves, or contact the factory for the appropriate derating. (3) If the remote sense ground is not used, pin 12 must be connected to pin13 for optimum output voltage accuracy. External Capacitors: The PT7778 requires a minimum output capacitance of 330µF for proper operation. The PT7778 also requires an input capacitance of 2400µF , which must be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further infor- mation, see the accompanying application note on capacitor selection for this product. Input Filter: An input filter inductor is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH.

For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7778—3.3V

Ordering Information

PT7778❏❏❏❏❏ = 1.3 to 3.5 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
  • 32A Output (64A with PT7740 Booster)
  • 4-bit Programmable: 1.3V to 2.05V
  • High Efficiency
  • Short Circuit Protection
  • Differential Remote Sense
  • 27-pin SIP Package

Features

PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C Power Dissipation Vs Output Current Performance Characteristics, Vin =3.3V (See Note A) Efficiency Vs Output Current PT7778, VIN =3.3V, VO =1.8V Output Ripple Vs Output Current 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 0 4 8 12 16 20 24 28 32 Iout (A) Efficiency - % 1.8V 1.5V VOUT 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 0 4 8 12 16 20 24 28 32 Iout (A) Ripple - mV 1.5V 1.8V VOUT 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 0 4 8 1 21 62 02 42 83 2 Iout (A) Pd - Watts 1.8V 1.5V VOUT 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Iout (A) Ambient Temperature (°C) 400LFM 200LFM 120LFM Nat conv Airflow Safe Operating Area Curves (See Note B) Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the regulator. Note B: Safe Operating Area curves represent conditions at which internal components are at or beow manufacturer’s rated operating temp eratures.

Orderable Device Status(1) Package Type Package Drawing Pins Package Qty Eco Plan(2) Lead/Ball FinishMSL Peak Temp (3) PT7778C NRND SIP MOD ULE EJC 27 TBD Call TI Call TI (1)The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2)Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontentfor the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS):TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br):TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. PACKAGE OPTION ADDENDUM www.ti.com 28-Aug-2008 Addendum-Page 1

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