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)
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