PT7779—5V 32 Amp Programmable Integrated Switching Regulator SLTS116 (Revised 8/31/2000) Description The PT7779 is a high-output 32A Integrated Switching Regulator (ISR), housed in a 27-pin SIP package. The PT7779 is the next generation of the industry benchmark PT7771. The PT7779 includes short circuit protection and requires only 330µF of output capacitance for proper operation. The 32A output capability allows the easy integration of the latest Pin-Out Information Standard Application VID0 VID1 VID2 VID3 VID4 PROGRAMMING PINS REMOTE SENSE(+) 6 4 3 2 1 7-11 26 1µH + 27 C IN 5 13-19 V OUT 20-25 PT7779 12 L O A D + COUT SYNC OUT GND GND REMOTE SENSE(–) STBY* 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 Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 VID4 7 Vin 8 Vin C in = Required 2400µF electrolytic C out = Required 330µF electrolytic L1 = Optional 1µH input choke L1 V IN high-speed, µPs, ASICs, DSPs into existing 5V systems. For additional current, the PT7779 is designed to operate with up to two PT7741 32A compatible current boosters. The output voltage is programmable from 1.3V to 3.5V using a 5-bit input, that is compatible with Intel’s Pentium II Processors. A differential remote sense compensates for any voltage drop between the ISR and load. 9 10 11 12 13 14 Vin Vin Vin Remote Sense Gnd (3) GND GND For STBY* pin; open = output enabled; ground = output disabled. Specifications PT7779 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 Input Voltage Range Vin 0.1A ≤ I o ≤ 32A Output Voltage Tolerance ∆Vo Line Regulation Load Regulation Vo Ripple/Noise pk-pk Transient Response with Cout = 330µF Efficiency Switching Frequency Absolute Maximum Operating Temperature Range Storage Temperature Typ Max Units — — 31 32 A 4.5 — 5.5 V Vin = +5V, Io = 32A –40°C ≤ Ta ≤ +85°C Vo-0.03 — Vo+0.03 V Regline 4.5V ≤ V in ≤ 5.5V, I o = 32A — ±10 — mV Regload Vin = +5V, 0.1 ≤ Io ≤ 32A — ±10 — mV Vn Vin = +5V, Io = 32A — 50 — mV ttr Vos Io step between 16A and 32A Vo over/undershoot — — 100 200 — — µSec mV η Vin = +5V, Io = 20A, V o = 3.3V — 90 — % ƒo 4.5V ≤ V in ≤ 5.5V 0.1A ≤ I o ≤ 32A 300 350 400 kHz Ta Over V in Range –40 — +85 Ts — -40 — +125 °C Per Mil-STD-883D, Method 2007.2, 20-20,000Hz, Soldered in a PC board — 10/15 — G’s Vertical/Horizontal — 53/66 — grams Mechanical Vibration Weight — (1) (1) (2) °C 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 PT7779 requires a minimum output capacitance of 330µF for proper operation. The PT7779 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 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 1µH. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7779—5V 32 Amp Programmable Integrated Switching Regulator Ordering Information Programming Information Features • +5V Input VID3 VID2 VID1 VID0 • 32A Output (64A with PT7741 Booster) 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 • 5-bit Programmable: 1.3V to 3.5V • High Efficiency • Short Circuit Protection • Differential Remote Sense • 27-pin SIP Package 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 PT7779❏ ❏ = 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 Performance Characteristics, Vin =5V C H A R A C T E R I S T I C S (See Note A) Safe Operating Area Curves PT7779, VIN =5V, V O =3.3V Efficiency Vs Output Current 90.0 95.0 80.0 VOUT 85.0 1.8V 2.5V 3.3V 80.0 75.0 70.0 Ambient Temperature (°C) 100.0 90.0 Efficiency - % (See Note B) 70.0 Airflow 400LFM 200LFM 120LFM Nat conv 60.0 50.0 40.0 30.0 65.0 60.0 20.0 0 4 8 12 16 20 24 28 0.0 32 Iout (A) 4.0 8.0 12.0 16.0 20.0 24.0 28.0 32.0 Iout (A) Output Ripple Vs Output Current 80 70 Ripple - mV 60 VOUT 50 1.8V 2.5V 3.3V 40 30 20 10 0 0 4 8 12 16 20 24 28 32 Iout (A) Power Dissipation Vs Output Current 16.00 14.00 Pd - Watts 12.00 VOUT 10.00 1.8V 2.5V 3.3V 8.00 6.00 4.00 2.00 0.00 0 4 8 12 16 20 24 28 32 Iout (A) 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 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. 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