For assistance or to order, call (800) 531-5782 Series PT7777 Revised 7/31/98 32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR The PT7777 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 5V systems. The output voltage of the PT7777 can be easily programmed from 1.3V to 3.5V with a 5 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. 680µF of output capacitance is required for proper operation. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 VIN REMOTE SENSE (+) 6 4 3 2 1 L1 PT7777 7 - 11 1µH CIN + 26 27 13 - 19 5 VOUT 20 - 25 12 COUT + LOAD SYNC OUT GND GND STBY* REMOTE SENSE (-) C in = Required 2400µF electrolytic Cout = Required 680µF electrolytic L1 = Optional 1µH input choke Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 VID4 7 V in 8 V in 9 V in 10 V in 11 V in 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 Vout 27 Sync Out For STBY* pin; open = output enabled; ground = output disabled. Specifications PT7777 SERIES Characteristics (T a = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current Io Ta = +60°C, 200 LFM, pkg N Ta = +25°C, natural convection 0.1 (1) 0.1 (1) — — 32 26 A A Input Voltage Range Vin 0.1A ≤ Io ≤ 32A 4.5 (2) — 5.5 V Output Voltage Tolerance ∆Vo Vin = +5V, Io = 32A 0°C ≤ Ta ≤ +55°C Vo-0.03 — Vo+0.03 V Line Regulation Reg line 4.5V ≤ Vin ≤ 5.5V, Io = 32A — ±10 — mV Load Regulation Reg load Vin = +5V, 0.1 ≤ Io ≤ 32A — ±10 — mV V o Ripple/Noise pk-pk Vn Vin = +5V, Io = 32A — 50 — mV Transient Response with Cout = 680µF t tr Vos Io step between 16A and 32A Vo over/undershoot — — 100 200 — — µSec mV Efficiency η Vin = +5V, Io = 20A, Vo = 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 — 0 — +85 °C Recommended Operating Temperature Range Ta Forced Air Flow = 200 LFM Over Vin and Io Ranges 0 — +65 °C Storage Temperature Ts — -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 4.5V or Vout+1.2V, whichever is greater. Output Capacitors: The PT7777 series requires a minimum output capacitance of 680µF 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. Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com For assistance or to order, call (800) 531-5782 PT7777 Series Programming Information Features • +5V input • 5-bit Programmable: 1.3V to 3.5V@32A • High Efficiency • Input Voltage Range: 4.5V to 5.5V • Differential Remote Sense • 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 PT7777❏ ❏ = 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. CHARACTERISTIC DATA Efficiency vs Output Current (@Vout=+3.3V) Safe Operating Area (@Vin=+5V, Vout=+3.3V, Pkg N) 90 90 Vin 4.5V 5.0V 5.5V 80 70 80 70 Airflow Recommended Maximum Operating Temperature 60 Nat. Conv 60 LFM 120 LFM 200 LFM 50 40 30 20 60 0 0 4 8 12 16 20 24 28 4 8 12 16 20 24 28 32 32 Output Current (A) Output Current (A) 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=+3.3V) Pd (W atts) (Watts) Ambient TTemperatur emperatur emperaturee (°C) Efficiency (%) 100 20 18 16 14 12 10 8 6 4 2 0 Vin 4.5V 5.0V 5.5V 0 4 8 12 16 20 24 28 32 Output Current (A) Output Ripple vs Output Current (@Vout=+3.3V) 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) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 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. 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