for technical support and more information, see inside back cover or visit www.ti.com/powertrends features description 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. the booster adds a parallel output stage that is driven directly by the regulator. both operate in per fect sychronization for a low noise solution. the pt7740 only operates with a pt7778 regulator and is not a stand- alone product. please refer to the pt7778 data sheet for the perfor- mance specifications. the current booster has the same package options as its companion regulator. pt77403.3v 32 amp current booster for pt7778 r egulator ordering information pt7740 o ? 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) standard application (for dimensions and pc board layout, see package styles 1020 and 1030.) pin-out information pin function 1 do not connect 2 do not connect 3 do not connect 4 do not connect 5 do not connect 6 do not connect 7v in 8v in 9v in 10 v in 11 v in 12 do not connect 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 do not connect 27 master sync in c in + c out + load v in vid0 vid1 vid2 vid3 v out gnd gnd stby* l1 1h remote sense ( C ) remote sense ( + ) programming pins c in + l1 1h pt7740 20-25 13-19 27 7-11 vo vin gnd synch in pt7778 4321 26 20-25 12 5 13-19 27 7-11 vo vin gnd sns(+) sns(-) synch out stby vid3 - vid0 c out + pt series suffix (pt1234 x ) case/pin configuration vertical through-hole n horizontal through-hole a horizontal surface mount c external capacitors: when used with a pt7778, the pt7740 requires a minimum ouput capacitance of 330f. the maximum allowable output capacitance i s 30,000f. the pt7740 also requires a minimum input capacitance of 2400f, 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 applicatio n 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 1h. slts117 (revised 8/31/2000)
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 acknowledgment, 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. customers are responsible for their applications using ti components. 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 ? 2000, texas instruments incorporated
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