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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 21 v 1.0 aat1205 details are subject to change without notice 400-ma multi-input low-dropout regulator with dual output power management features z complete power management z automatic input voltage selection z input voltage source detector with hysteresis z 400-ma load current capability with vcc50 ?b vsb50 or aux33 input source z integrated low () on ds r switch z dual regulated output 3.3v ?] fixed ?^ & 2.5v ?] fixed ?^ z output short circuit protection (scp) pin configuration description the aat1205 is a multi-input low-dropout regulator (ldo) specially designed for lan cards. it provides advanced dua l constant output supply 3.3v & 2.5v at the output capable of driving a 400-ma load. the output (out25) can be disabled by connecting en25 pin to gnd. the aat1205 is equipped with dual regulated power output for systems with multiple input sources and require dual c onstant voltage source with a low-dropout voltage. this is an intelligent power source selection device with a low-dropout regulator for either vcc50 or vsb50 inputs, and a low-resistance bypass switch for the aux33 input. the aat1205 allows transitions to progress smoothly from one input supply to another without generating a glitch outside of the specified range of 3.3v & 2.5v output. furthermore, this device has an incorporated reve rse-blocking scheme to prevent excessive leakage from the input terminals in the event that the output voltage is greater than the input voltage. the input voltage is prioritized in the following order: vcc50, vsb50, aux33. vsb50 vcc50 out33 aux33 gnd gnd en25 out25 1 2 3 4 8 7 6 5 ( 8-pin sop ) top view
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 2 of 21 v 1.0 aat1205 function table input voltage status ?] v ?^ input selected output ?] v ?^ output ?] i ?^?] ma ?^ en25 vcc50 vsb50 aux33 vcc50/vsb50/aux33 out33 out25 iout33+iout25 hi 0 0 0 none 0 0 0 low 0 0 0 none 0 0 0 hi 0 0 3.3 aux33 3.3 2.5 400 low 0 0 3.3 aux33 3.3 0 400 hi 0 5 0 vsb50 3.3 2.5 400 low 0 5 0 vsb50 3.3 0 400 hi 0 5 3.3 vsb50 3.3 2.5 400 low 0 5 3.3 vsb50 3.3 0 400 hi 5 0 0 vcc50 3.3 2.5 400 low 5 0 0 vcc50 3.3 0 400 hi 5 0 3.3 vcc50 3.3 2.5 400 low 5 0 3.3 vcc50 3.3 0 400 hi 5 5 0 vcc50 3.3 2.5 400 low 5 5 0 vcc50 3.3 0 400 hi 5 5 3.3 vcc50 3.3 2.5 400 low 5 5 3.3 vcc50 3.3 0 400 pin description terminal name no. i/o description vsb50 1 i 5v standby supply input vcc50 2 i 5v main supply input out33 3 o 3.3v regulated output aux33 4 i 3.3v auxiliary supply input out25 5 o 2.5v regulated output en25 6 i enable input of out25 gnd 7 i ground gnd 8 i ground
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 21 v 1.0 aat1205 absolute maximum ratings ? main supply voltage, () 50 vcc v ?????.??.????????????... 5 . 0 ? v~7v ? standby supply voltage, () 50 vsb v ??????.????????????? 5 . 0 ? v~7v ? auxiliary supply voltage, () 33 aux v ?????.?????????.?....?.... 5 . 0 ? v~7v ? output current limit, () limit i ?????????????.?????.???1.5a ? continuous power dissipation, d p ?] see note 1 ?^ ?????.???????? 1.6w ? electrostatic discharge susceptibility, human body mode???????.???.2kv ? operating ambient temperature range, c t ??????.?????..????0 to 70 jj ? storage temperature range, storage t ?????.?????.????????.. 45 ? to j +125 j ? operating junction temperature range, j t ?????.??????...??........ 5 ? to j +130 j ? lead temperature ?] soldering for 10 seconds ?^ , () lead t ???????.???.260 j note 1 ?g the device deteriorates with increase in ambient temperature, c t . see thermal information section. recommended operating conditions parameter min typ max unit 5v main supply input, vcc50 4.5 - 5.5 v 5v standby supply input, vsb50 4.5 - 5.5 v 3.3v auxiliary supply input, aux33 3.0 - 3.6 v load capacitance, l c 4.23 4.70 5.17 f j
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 4 of 21 v 1.0 aat1205 electrical characteristics over recomme nded operating free-air temperature, t c = 0 to 70 , jj c l = 4.7f (unless otherwise specified) parameter symbol test condition min typ max unit 5v inputs vcc50 vsb50 4.5 5.0 5.5 v 3.3v output out33 33 out i+ 25 out i = 400ma 3.135 3.300 3.465 v 2.5v output out25 33 out i=0, 25 out i = 300ma 2.375 2.500 2.625 v line regulation voltage () vi o v ? ? vsb50 or vcc50 = 4.5v to 5.5v - 2 - mv load regulation voltage () io o v ? ? 20 ma ?? l i ?? 250 ma - 40 - mv quiescent supply current 50 i from vcc50 vsb50 terminals, l i= 0 to 400ma - 1.0 3.0 ma aux i aux i from aux33 terminal, l i = 0a - 1.0 3.0 ma out33 load current 33 l i 0.4 - - out25 load current 25 l i 0.3 - - output current limit limit i out33 or out25 output shorted to 0v - - 1.5 a thermal shutdown (note 2) tsd t 150 - 180 thermal hysteresis (note 2) hys t - 15 - j load capacitance l c minimal esr to insure stability of regulated output - 4.7 - f reverse leakage output current () rev ikg i tested for input that is grounded. aux33, vsb50 or vcc50 = gnd, out33 = 3.3v - - 50 a threshold voltage, low lo v vsb50 or vcc50 4.0 4.2 4.4 v threshold voltage, high hi v vsb50 or vcc50 4.25 4.45 4.65 v auxiliary switch resistance switch r vsb50 = vcc50 = 0v, aux33 = 3.3v, l i = 150ma - - 0.4 ? ja r power pad is not soldered on the heat spreading copper - 80 - power pad is soldered on the heat spreading copper - 50 - / j w note 2 ?g design targets only. not tested in production. note 3 ?g please refer to "thermal information"
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 21 v 1.0 aat1205 function block vcc50 detector + - vcc50 3.3v aux33 gnd over temperature protection out25 2.5v vsb50 detector control out33 vsb50 3.3v low on resistance - - + + en25
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 21 v 1.0 aat1205 typical characteristics fig. 1. 3.3v vcc50 cold start fig. 2. 2.5v vcc50 cold start
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 21 v 1.0 aat1205 typical characteristics fig. 3. 3.3v aux33 cold start fig. 4. 2.5v aux33 cold start
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 21 v 1.0 aat1205 typical characteristics fig. 5. 3.3v vcc50 power up (vsb50=5v) fig. 6. 2.5v vcc50 power up (vsb50=5v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 21 v 1.0 aat1205 typical characteristics fig. 7. 3.3v vcc50 power up (aux33=3.3v) fig. 8. 2.5v vcc50 power up (aux33=3.3v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 10 of 21 v 1.0 aat1205 typical characteristics fig. 9. 3.3v vsb50 power up (aux33=3.3v) fig. 10. 2.5v vsb50 power up (aux33=3.3v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 21 v 1.0 aat1205 typical characteristics fig.11. 3.3v vcc50 power down (vsb=5v) fig. 12. 2.5v vcc50 power down (vsb=5v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 12 of 21 v 1.0 aat1205 typical characteristics fig. 13. 3.3v vcc50 power down (aux33=3.3v) fig. 14. 2.5v vcc50 power down (aux33=3.3v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 21 v 1.0 aat1205 typical characteristics fig. 15. 3.3v load transient response falling fig. 16. 2.5v load transient response falling
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 14 of 21 v 1.0 aat1205 typical characteristics fig. 17. 3.3v load transient response rising fig. 18. 2.5v load transient response rising
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 21 v 1.0 aat1205 thermal information to ensure reliable operation of the de vice, the junction temperature of th e output device must be within the safe operating area ?] soa ?^ . this is achieved by having a means to dissipate the heat generated from the junction of the output structure. th ere are two components that contri bute to thermal resistance. they consist of two paths in series. the first path is the junction to case thermal resistance, r jc ; the second path is the case to ambient thermal resistance, r ca . the overall junction to ambient thermal resistance, r ja , is determined by ?g r ja ? r jc ?? r ca package and board layout incorporated in the application determines the ability to efficiently dissipate the heat from the junction. the operating junction temp erature is determined by the operation ambient temperature, t c , and the junction power dissipation, p j . the junction temperature, t j , is equal to the following thermal equation ?g t j ? t c ?? p j ?] r jc ?^?? p j ?] r ca ?^ t j ? t c ?? p j ?] r ja ?^ the aat1205 is housed in a thermal enhanced package wh ere the power pad is located in the bottom of the device. when the power pad is soldered on a double-side d printed circuit board with two square inches of copper allocated for "heat spreading", the resulting ja is 50 /w. hence, the maximum power dissipation j allowable for an operating ambient temperature of 70 , and a maximum junction temperature of 150 is jj determined as ?g p j ??] t j ?e t c ?^ / r ja p j ??] 150 ?e 70 ?^ /50 ? 1.6w worst case maximum power dissipation is determined by ?g p d ??] 5.5 ?e 2.375 ?^ 0.3+(5.5-3.135) 0.1 ? 0.0.9375+0.2365=1.174w normal operating maximum power dissipation is ?g p d ??] 5 ?e 2.5 ?^ 0.3+(5-3.3) 0.1 ? 0.75+0.17=0.92w note: all thermal characteristics of the aat1205 were measured using a double-sided board with two square inches of copper area connected to the gnd pins for "heat spreading". the use of multi-layer board construction with power planes will further enhance the thermal performance of the package.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 16 of 21 v 1.0 aat1205 thermal information (cont.) pcb layout example 2.5 1.174 0.92 25 91 104 150 power-w ambient temperature - xc note: these curves are to be used for guideline purposes only. for a particular application, a more specijic thermal characterization is required. power dissipation derating curves
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 17 of 21 v 1.0 aat1205 application information typical application schematic - dual output 4.7 g f to out33 or floating 2.5v 3.3v 4.7 g f 4.7 g f 4.7 g f 4.7 g f 0.1 g f 0.1 g f 0.1 g f 18 2 3 4 5 6 7 vsb50 vcc50 out33 aux33 gnd gnd en25 out25 aat1205 4.7 g f 4.7 g f 4.7 g f typical application schematic - only out33 used gnd or floati n gnd gnd or floati n 4.7 g f 0.1 g f 0.1 g f 0.1 g f 18 2 3 4 5 6 7 vsb50 vcc50 out33 aux33 gnd gnd en25 out25 aat1205 3.3v
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 18 of 21 v 1.0 aat1205 package dimension 8-pin sop dimensions in deminsions in symbol s min typ max min typ max a 1.47 1.60 1.73 0.058 0.063 0.068 a1 0.10 --- 0.22 0.004 --- 0.008 a2 --- 1.45 --- --- 0.057 --- b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.20 0.25 0.0075 0.008 0.0098 d 4.80 4.85 4.95 0.189 0.191 0.195 e 5.80 6.00 6.20 0.228 0.236 0.244 e1 3.80 3.90 4.00 0.150 0.154 0.157 e --- 1.27 --- --- 0.050 --- l 0.38 0.71 1.27 0.015 0.028 0.050 y --- --- 0.076 --- --- 0 0 --- 0 0 --- 0
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 19 of 21 v 1.0 aat1205 tape and reel 8-pin sop
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 20 of 21 v 1.0 aat1205 tape and reel 8-pin sop (cont.) note: 1. 10 sprocket hole pitch cumulative tolerance camber not to exceed 1 millimeter in 100 millimeters 3. material: anti-static black advantek polystyrene. 4. 0 a and 0 b are measured on a plane 0.3 millimeters above the bottom of the pocket. 5. 0 k is measured from a plane on the inside bottom of the pocket to the top surface of the carrier. 6. pocket position relative to sprocket hole is measured as true position of pocket, not pocket hole. part marking sop8 top marking aat1205 xxxxxx sop8 back marking yyww
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 21 of 21 v 1.0 aat1205 ordering information

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