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| PT7746--5V/3.3V 32 Amp "Current Booster" for PT7770 Series Regulators SLTS049A (Revised 6/30/2000) The PT7746 is a high-output 32 Amp "Current Booster" for the PT7770 series housed in a 27-pin SIP package. Multiple PT7746 boosters will operate in parallel with any of the PT7770 series products, boosting output current in increments of 32A. Combinations of a PT7770 series regulator and PT7746 current boosters can supply enough power for virtually any multiple mega-processor application. A PT7746 current booster adds a parallel output stage that is driven from the regulator. As such, the system runs in perfect sychronization providing a low noise solution. The PT7746 only operates in combination with a PT7770 series regulator and is not a stand-alone product. Please refer to the PT7771, PT7772, or PT7777 series data sheet for performance specifications. The PT7746 has the same mechanical outline and package options as the PT7770 series. Pin-Out Information Pin Function Pin Function 14 15 16 17 18 19 20 21 22 23 24 25 26 27 GND GND GND GND GND GND Vout Vout Vout Vout Vout Vout Do not connect Master Sync In Ordering Information PT7746J (For dimensions and PC Board layout, see Package Styles 1020 and 1030.) Features 32A Current Boost Tracks Vo of a PT7770 High Efficiency Input Voltage Range: 3V to 5.5V * Synchronized with PT7770 * 27-pin SIP Package * Run up to 2 in Parallel 96 Amps * * * * 1 2 3 4 5 6 7 8 9 10 11 12 13 Do not connect Do not connect Do not connect Do not connect Do not connect Do not connect Vin Vin Vin Vin Vin Do not connect GND PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount N A C Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 VID4 REMOTE SENSE (+) 64321 26 V IN L1 7 - 11 1H + 27 PT7770 13 - 19 5 12 20 - 25 V OUT CIN STBY* GND COUT + LOAD GND REMOTE SENSE (-) 27 L1 7 - 11 1H + PT7746 13 - 19 20 - 25 When used with PT7771/7772: Cin = Required 2400F electrolytic Cout = Required 2400F electrolytic L1 = Optional 1H input choke COUT + CIN When used with PT7777: Cin = Required 2400F electrolytic Cout = Required 680F electrolytic L1 = Optional 1H input choke Output Capacitors: When used with a PT7771 or PT7772, the PT7746 requires a minimum ouput capacitance of 2400F. When used with a PT7777, the PT7746 requires a minimum ouput capacitance of 680F 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 IMPORTANT NOTICE 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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