cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 1/6 PL1084A-XXXF3 cystek product specification 5a low dropout positive voltage regulator PL1084A-XXXF3 features maximum dropout voltage 1.65v at 5a output current. fast transient response. extremely tight line and load regulation. to-263 current limiting and thermal protection. adjustable output voltage or fixed 1.5v, 1.8v,2.5v,3.3v,5.0v. standard 3-pin power packa ges. description the PL1084A-XXXF3 is a low dropout three terminal regulato r with 5a output current capability. the output voltage is adjustable with the use of a resistor divider or fixed 1.5v, 1.8v, 2.5v, 3.3v, and 5.0v. dropout voltage is guaranteed to be at maximum of 1.5v with the maximum output current. its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. current limit and thermal protection provide protection against any overload condition that would create excessive junction temperatures. applications mother board i/o power supplies. microprocessor power supplies. high current regulator. post regulator for switching supply. typical application circuit vref pl1084a-adj 1 2 v in=5v vout=3.3v c2 10f r1 125 1% r2 205 1% c1 10f adj 3 adjustable voltage regulator fixed voltage regulator c2 10f c1 10f vout=3.3v vin=5v pl1084a-3.3 1 2 3
cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 2/6 PL1084A-XXXF3 cystek product specification ordering information device output voltage pl1084a-adjf3 adjustable pl1084a-1.5f3 1.5v pl1084a-1.8f3 1.8v pl1084a-2.5f3 2.5v pl1084a-3.3f3 3.3v pl1084a-5.0f3 5.0v absolute maximum ratings symbol parameter ratings unit vin dc supply voltage -0.3 to +12 v p d power dissipation internally limited t stg storage temperature -65 ~ +150 t opr operating junction temperature 0 ~ +150 electrical characteristics (io=10ma,tj=25 , unless otherwise noted) symbol parameter conditions min typ max units v ref reference voltage vin-vout=1.5v 1.225 1.250 1.275 v vo output voltage pl1084a-1.5 3v vin 12v pl1084a-1.8 3.3v vin 12v pl1084a-2.5 4v vin 12v pl1084a-3.3 4.8v vin 12v pl1084a-5.0 6.5v vin 12v 1.470 1.764 2.450 3.235 4.900 1.500 1.800 2.500 3.300 5.000 1.530 1.836 2.550 3.365 5.100 v vo line regulation fixed: vout+1.5v vin 12v - - 0.2 % adj vin=3.3v, 0 io 5a - - 1 % pl1084a-1.5 vin=3.0v, 0 io 5a - 12 15 pl1084a-1.8 vin=3.3v, 0 io 5a - 15 18 pl1084a-2.5 vin=4.0v, 0 io 5a - 20 25 pl1084a-3.3 vin=5.0v, 0 io 5a - 26 33 vo load regulation(note 1, 2) pl1084a-5.0 vin=8.0v, 0 io 5a - 40 50 mv io=1a ( vout=1%v out ) - 1.18 1.25 io=2a ( vout=1%v out ) 1.25 1.30 v d dropout voltage io=5a ( vout=1%v out ) - 1.55 1.65 v is current limit vin-vout=5v 5.1 - - a i adj adjust pin current vin=12v, io=10ma - 55 100 a i q quiescent current vin=12v, io=0ma(fixed model) - - 12 ma ts temperature stability io=10ma, 0 c tj 125 c - 0.5 - % i l minimum load current vin=5v(adjustable model) - 5 10 ma ja thermal resistance, junction to ambient(no heat sink; no air flow) - 91 - /w jc thermal resistance, junction to case - 10 - /w
cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 3/6 PL1084A-XXXF3 cystek product specification note: 1. see thermal regulation specifications for changes in output voltage due to heating effects. line and load regulation are measured at a constant junction temperatur e by low duty cycle pulse testing. load regulation is measured at the output lead =1/18? from the package. 2. line and load regulation are guaranteed up to the maximum power dissipation of 15w. power dissipation is determined by the difference between input and output and the output current. guaranteed maximum power dissipation will not be over the full input/output range. block diagram functional description introduction the pl1084a adjustable low dropout(ldo) regulator is a 3 te rminal device that can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25v to 2.5v. the pl1084a only needs 1.5v differential between vin and vout to maintain output regula tion. in addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. for example, intel vre specification calls for a total of 100mv including initial tolerance, load regulation and 0 to 5a load step. the pl1084a is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost w ith the need for fewer output capacitors. output voltage setting the pl1084a can be programmed to any voltages in the range of 1.25v to 5v with the addition of r1 and r2 external resistors according to the following formula: vout=vref(1+r2/r1)+iadj*r2, where vref=1.25v typically, iadj=55 a typically the pl1084a keeps a constant 1.25v between the output pin and the adjust pin. by placing a resistor r1 across these two pins, a constant current flows through r1, adding to th e iadj current requirement of the pl1084a. r1 is typically selected to be 121 resistor so that it automatically satisfies the minimum current requirement. notice that since iadj is typically in the range of 55 a, it only adds a small error to the outpu t voltage and should only be considered when a very precise output voltage setting is required. fo r example, in a typical 3.3v application where r1=121 and r2=200 , the error due to iadj is only 0.3% of the nominal set point.
cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 4/6 PL1084A-XXXF3 cystek product specification load regulation since the pl1084a is only a 3 terminal device, it is not possi ble to provide true remote se nsing of output voltage at the load. the best load regulation is ach ieved when the bottom side of r2 is conn ected to the load and the top side of r1 is connected directly to the case or the vout pin of the regul ator and not to the load. it is important to note that for high current applications, this can represent a significant per centage of the overall load regulation and one must keep the path from the regulator to the load as short as possible to minimize this effect. stability the pl1084a requires the use of an output capacitor as pa rt of the frequency compensation in order to make the regulator stable. for most applications, a minimum of 10 f aluminum electrolytic capacitor insures both stability and good transient response. thermal design the pl1084a incorporates an internal shutdown that prot ects the device when the junction temperature exceeds the maximum allowable junction temperature. although this de vice can operate with junction temperatures in the range of 150 , it is recommended that the selected heat sink be c hosen such that during maximum continuous load operation, the junction temperature is kept below the temperature. layout consideration the output capacitors must be located as close to the vout terminal of the device as possible. it is recommended to use a section of a layer of the pc board as a plane to connect the vout pin to the output capacitors to prevent any high frequency oscillation that may result due to excess trace inductance.
cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 5/6 PL1084A-XXXF3 cystek product specification characteristic curves
cystech electronics corp. spec. no. : c547f3 issued date : 2007.09.26 revised date page no. : 6/6 PL1084A-XXXF3 cystek product specification to-263 dimension *:typical inches millimeters inches millimeters dim min. max. min. max. a b c d 123 k l j g h f e 2 1 2 3 i style : pin 1.adj(gnd) 2.vout(tab) 3.vin 3-lead plastic surface mounted package cystek package code : f3 marking : 1.5v -15 1.8v -18 2.5v -25 3.3v -33 5.0v -50 adj blank vo u t : date code device name 1084a dim min. max. min. max. a 0.3800 0.4050 9.65 10.29 i 0.0500 0.0700 1.27 1.78 b 0.3300 0.3700 8.38 9.40 j - *0.1000 - *2.54 c - 0.0550 - 1.40 k 0.0450 0.0550 1.14 1.40 d 0.5750 0.6250 14.61 15.88 l 0.0200 0.0390 0.51 0.99 e 0.1600 0.1900 4.06 4.83 1 - - 6 8 f 0.0450 0.0550 1.14 1.40 2 - - 6 8 g 0.0900 0.1100 2.29 2.79 3 - - 0 5 h 0.0180 0.0290 0.46 0.74 notes : 1.controlling dimension : millimeters. 2.maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.if there is any question with packing specification or packing method, please c ontact your local cystek sales office. material : ? lead : 42 alloy ; solder plating ? mold compound : epoxy resin family, flammability solid burning class:ul94v-0 important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of cystek. ? cystek reserves the right to make changes to its products without notice. ? cystek semiconductor products are not warranted to be suitable for use in life-support applications, or systems. ? cystek assumes no liability for any consequence of customer pr oduct design, infringement of pat ents, or application assistance .
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