PT7740—3.3V 32 Amp “Current Booster” for PT7778 Regulator SLTS117 (Revised 8/31/2000) Description The booster adds a parallel output stage that is driven directly by the regulator. Both operate in perfect sychronization for a low noise solution. The PT7740 only operates with a PT7778 regulator and is not a standalone product. Please refer to the PT7778 data sheet for the performance specifications. The current booster has the same package options as its companion regulator. The PT7740 is a high-output 32 Amp “Current Booster” designed to operate with the PT7778 regulator. Up to two PT7740 boosters will operate in parallel with a PT7778, boosting output current in increments of 32A. Combinations of a PT7778 series regulator and PT7740 current boosters can supply enough power for virtually any multiple mega-processor application. Pin-Out Information Features Pin Function Pin Function • • • • 32A Current Boost Tracks Vo of a PT7778 High Efficiency Input Voltage Range: 3.1V to 3.6V • Synchronized with PT7778 • 27-pin SIP Package • Run up to 2 in Parallel (96A) Ordering Information PT7740❏ 1 Do not connect 14 GND 2 Do not connect 15 GND (For dimensions and PC Board layout, see Package Styles 1020 and 1030.) 3 Do not connect 16 GND 4 Do not connect 17 GND 5 Do not connect 18 GND 6 Do not connect 19 GND 7 Vin 20 Vout 8 Vin 21 Vout Case/Pin Configuration PT Series Suffix (PT1234X) 9 Vin 22 Vout Vertical Through-Hole 10 Vin 23 Vout Horizontal Through-Hole 11 Vin 24 Vout Horizontal Surface Mount 12 Do not connect 25 Vout 13 GND 26 Do not connect 27 Master Sync In N A C Standard Application PROGRAMMING PINS VID0 VID1 VID2 VID3 REMOTE SENSE (+) 4 3 2 1 26 SNS(+) VID3 - VID0 V IN L1 7 - 1 1 Vin PT7778 1µH + STBY 5 C IN Synch Out 27 GND 13-19 Vo VOUT 20-25 SNS(-) + 12 LOAD COUT GND GND STBY* REMOTE SENSE (–) 27 Synch In L1 7 - 1 1 Vin 1µH + C IN PT7740 Vo 20-25 GND 13-19 + COUT External Capacitors: When used with a PT7778, the PT7740 requires a minimum ouput capacitance of 330µF. The maximum allowable output capacitance is 30,000µF. The PT7740 also requires a minimum 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 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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