For assistance or to order, call Application Notes Mechanical Outline Product Selector Guide (800) 531-5782 Series PT7770 32 AMP HIGH-PERFORMANCE “SLEDGE HAMMER” PROGRAMMABLE ISR The PT7770 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 PT7770 can be easily programmed Revised 5/15/98 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. 2400µF of output capacitance are 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 PT7770 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 C out = 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 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 PT7770 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 V in 0.1A ≤ Io ≤ 32A 4.5 (2) — 5.5 V Output Voltage Tolerance ∆V o Vin = +5V, Io = 32A 0°C ≤ Ta ≤ +55°C V o -0.03 — V o +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 = 2400µF t tr V os Io step between 16A and 32A V o 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 PT7770 series 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. 2 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 PT7770 Series Programming Information Features VID3 VID2 VID1 VID0 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 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 PT7771❏ ❏ = 1.3 to 3.5 Volts 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 3 DATA SHEETS 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Ordering Information VID4=1 VID4=0 Vout Vout 5V Bus Products • +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 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 acknowledgement, 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. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK. 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 1999, Texas Instruments Incorporated