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| PT7778--3.3V 32 Amp Programmable Integrated Switching Regulator SLTS115 (Revised 8/31/2000) 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 330F 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 compatible with Intel's Pentium(R) II Processors. The 32A capability provides the ideal power source for the industry's latest high-speed, low-voltage Ps, 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. Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 L1 1H + STBY Pin-Out Information Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 N/C 7 Vin 8 Vin LOAD REMOTE SENSE (+) 4 3 2 1 26 SNS(+) VID3 - VID0 V IN 7-11 Vin PT7778 Synch Out GND SNS(-) Vo 20-25 V OUT SYNC OUT GND STBY* C IN 5 27 13-19 12 + COUT GND REMOTE SENSE (-) 9 10 11 12 13 14 Vin Vin Vin Remote Sense Gnd (3) GND GND Pin Function 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 C in = Required 2400F electrolytic C out = Required 330F electrolytic L1 = Optional 1H input choke For STBY* pin; open = output enabled; ground = output disabled. Specifications Characteristics (T a = 25C unless noted) Output Current Input Voltage Range Output Voltage Tolerance Line Regulation Load Regulation Vo Ripple/Noise pk-pk Transient Response with Cout = 330F Efficiency Switching Frequency Absolute Maximum Operating Temperature Range Storage Temperature Mechanical Vibration Weight -- PT7778 Symbols Io Vin Vo Regline Regload Vn ttr Vos o Ta Ts Conditions Ta = +60C, 200 LFM, pkg N Ta = +25C, natural convection 0.1A I o 32A Vin = +3.3V, Io = 32A -40C Ta +85C 3.1V V in 3.6V, I o = 32A Vin = +3.3V, 0.1 I o 32A Vin = +3.3V, Io = 32A Io step between 16A and 32A Vo over/undershoot Vin = +3.3V, Io = 20A, Vo = 1.8V 3.1V V in 3.6V 0.1A I o 32A Over V in Range -- Per Mil-STD-883D, Method 2007.2 20-20,000Hz, Soldered in a PC board Vertical/Horizontal Min 0.1 0.1 3.1 Vo-0.03 -- -- -- -- -- -- 300 -40 -40 -- -- (1) (1) Typ -- -- -- -- 10 10 50 100 200 90 350 -- -- 10/15 53/66 Max 32 31 3.6 Vo+0.03 -- -- -- -- -- -- 400 +85 (2) Units A V V mV mV mV Sec mV % kHz C C G's grams +125 -- -- 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 330F for proper operation. The PT7778 also requires an input capacitance of 2400F, 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 information, 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 1H. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7778--3.3V 32 Amp Programmable Integrated Switching Regulator Features * +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 Programming Information 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 PT7778t = 1.3 to 3.5 Volts t For dimensions and PC board layout, see Package Style 1020 and 1030 Vout 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 Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C 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. TYPICAL Performance Characteristics, Vin =3.3V Efficiency Vs Output Current 90.0 85.0 80.0 CHARACTERISTICS (See Note A) Safe Operating Area Curves PT7778, VIN =3.3V, V O =1.8V 90.0 80.0 (See Note B) Ambient Temperature (C) 70.0 60.0 50.0 40.0 30.0 20.0 Airflow 400LFM 200LFM 120LFM Nat conv Efficiency - % 75.0 70.0 65.0 60.0 55.0 50.0 0 4 8 12 16 20 24 28 32 VOUT 1.8V 1.5V 0.0 4.0 8.0 12.0 16.0 20.0 24.0 28.0 32.0 Iout (A) Iout (A) Output Ripple Vs Output Current 80.0 70.0 60.0 Ripple - mV 50.0 40.0 30.0 20.0 10.0 0.0 0 4 8 12 16 20 24 28 32 VOUT 1.5V 1.8V Iout (A) Power Dissipation Vs Output Current 16.00 14.00 12.00 Pd - Watts 10.00 8.00 6.00 4.00 2.00 0.00 0 4 8 12 16 20 24 28 32 VOUT 1.8V 1.5V Iout (A) Note A: Characteristic data has been developed from actual products tested at 25C. 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 temperatures. For technical support and more information, see inside back cover or visit www.ti.com/powertrends 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 (c) 2000, Texas Instruments Incorporated |
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