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| PT7771--5V 32 Amp "Sledge Hammer" Programmable ISR SLTS054A (Revised 6/30/2000) The PT7771 is a high-output Integrated Switching Regulator (ISR) housed in a 27-pin SIP package. The PT7771 operates off a standard 5V bus to provide a 32 amp low-voltage power source for the industry's latest highspeed Ps, ASICs, DSPs. The PT7771 has been designed to work in parallel with one or more of the PT7746 -32A current boosters to increase the load current capability in increments of 32A. The output voltage is programmable from 1.3V to 3.5V via a 5-bit input, compatible with Intel's Pentiuma Pro Processor. A differential remote sense is also provided to compensate for voltage drop between the ISR and load. An output capacitance of 2400F is required for proper operation. Note that this product does not include short circuit protection. Pin-Out Information Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 64321 26 VIN L1 7 - 11 1H + 27 PT7770 13 - 19 5 12 20 - 25 VOUT C IN SYNC OUT GND STBY* C OUT + LOAD GND REMOTE SENSE (-) Pin Function 1 VID0 2 VID1 3 VID2 4 VID3 5 STBY*- Stand-by 6 VID4 7 Vin 8 Vin 9 Vin 10 Vin 11 Vin 12 Remote Sense Gnd 13 GND Pin Function 14 GND 15 GND 16 GND 17 GND 18 19 20 21 22 23 24 25 26 27 GND GND Vout Vout Vout Vout Vout Vout Remote Sense Vout Sync Out Cin = Required 2400F electrolytic Cout = Required 2400F 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 T olerance Line Regulation Load Regulation Vo Ripple/Noise pk-pk Transient Response with Cout = 2400F Efficiency Switching Frequency Absolute Maximum Operating T emperature Range Storage T emperature Weight PT7771 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 Io 32A Vin = +5V, Io = 32A 0C Ta +55C 4.5V V in 5.5V, Io = 32A Vin = +5V, 0.1 I o 32A Vin = +5V, Io = 32A Io step between 16A and 32A Vo over/undershoot Vin = +5V, Io = 20A, V o = 3.3V 4.5V Vin 5.5V 0.1A Io 32A Over Vin Range -- Vertical/Horizontal Min 0.1 0.1 4.5 (1) (1) (2) Typ -- -- -- -- 10 10 50 100 200 90 700 -- -- 53/66 Max 32 26 5.5 Vo+0.03 -- -- -- -- -- -- 750 +85 (3) Units A A V V mV mV mV Sec mV % kHz C C grams Vo-0.03 -- -- -- -- -- -- 650 0 -40 -- +125 -- Notes: (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. , (3) Consult the SOA curves or contact the factory for the appropriate derating. Output Capacitors: The PT7771 regulator requires a minimum output capacitance of 2400F for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 30,000F. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1H. 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. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT7771--5V 32 Amp "Sledge Hammer" Programmable ISR Features * +5V input * 5-bit Programmable: 1.3V to 3.5V@32A * High Efficiency * Differential Remote Sense * Parallelable with PT7746 32A "Current Booster" * 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 PT7771J = 1.3 to 3.5 Volts J 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 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 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 and VID4 may not be changed while the unit is operating. TYPICAL PT7771 @Vin =+5V, Vout =3.3V Efficiency vs Output Current 100 CHARACTERISTICS Safe Operating Area Curves 90 (See Note A) (See Note B) PT7771 @Vin =+5V, Vout =3.3V, Pkg N Temperature Ambient Temperature (C) 80 70 60 50 40 30 20 0 4 8 12 16 20 24 28 32 90 Efficiency (%) Vin 4.5V 5.0V 5.5V Airflow Nat. Conv 60 LFM 120 LFM 200 LFM 80 70 60 0 4 8 12 16 20 24 28 32 Output Current (A) Output Current (A) Power Dissipation vs Output Current 20 18 16 14 Vin 4.5V 5.0V 5.5V (Watts) Pd (Watts) 12 10 8 6 4 2 0 0 4 8 12 16 20 24 28 32 Output Current (A) Output Ripple vs Output Current 40 35 30 Ripple (mVpp) Vin 4.5V 5.0V 5.5V 25 20 15 10 5 0 0 4 8 12 16 20 24 28 32 Output Current (A) Note A: All characteristic data in the above graphs has been developed from actual procducts tested at 25C. This data is considered typical for the ISR. Note B: OA curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com/powertrends I MPORTANT NOTI CE Te xas Instrume nts and its subsidiarie s (TI) re se rve the right to make change s to the ir products or to discontinue any product or se rvice without notice , and advise custome rs to obtain the late st ve rsion of re le vant information to ve rify, be fore placing orde rs, that information be ing re lie d on is curre nt and comple te . All products are sold subje ct to the te rms and conditions of sale supplie d at the time of orde r acknowle dgme nt, including those pe rtaining to warranty, pate nt infringe me nt, and limitation of liability. TI warrants pe rformance of its se miconductor products to the spe cifications applicable at the time of sale in accordance with TI's standard warranty. Te sting and othe r quality control te chnique s are utilize d to the e xte nt TI de e ms ne ce ssary to support this warranty. Spe cific te sting of all parame te rs of e ach de vice is not ne ce ssarily pe rforme d, e xce pt those mandate d by gove rnme nt re quire me nts. Custome rs are re sponsible for the ir applications using TI compone nts. In orde r to minimize risks associate d with the custome r's applications, ade quate de sign and ope rating safe guards must be provide d by the custome r to minimize inhe re nt or proce dural hazards. TI assume s no liability for applications assistance or custome r product de sign. TI doe s not warrant or re pre se nt that any lice nse , e ithe r e xpre ss or implie d, is grante d unde r any pate nt right, copyright, mask work right, or othe r inte lle ctual prope rty right of TI cove ring or re lating to any combination, machine , or proce ss in which such se miconductor products or se rvice s might be or are use d. TI's publication of information re garding any third party's products or se rvice s doe s not constitute TI's approval, warranty or e ndorse me nt the re of. Copyright (c) 2000, Te xas Instrume nts Incorporate d |
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