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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 16 v 1.0 aat12 03 details are subject to change without notice 250-ma multi-input low-dropout regulator with v aux switch features z complete power management z automatic input voltage selection z input voltage source detector with hysteresis z 250-ma load current capability with vcc50 or vsb50 or aux33 input source z integrated low () on ds r switch z regulated output 3.3v (fixed) z output short circuit protection pin configuration description the aat1203 is a multi-input low-dropout regulator designed for lan cards. it provides constant output supply 3.3v at an output capable of driving a 250-ma load. the aat1203 is equipped with regulated power output for systems that have multiple input sources and require constant 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 aat1203 allows transitions to progress smoothly from one input supply to another without generating a glitch outside of the specified range of the 3.3-v output. the device has an incorporated reverse-blocking scheme to prevent excess 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 gnd gnd 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 16 v 1. 0 aat12 0 3 function table input voltage status (v) input selected output ?] v ?^ output ?] i ?^ ?] ma ?^ vcc50 vsb50 aux33 vcc50/vsb50/aux33 out33 iout33 0 0 0 none 0 0 0 0 3.3 aux33 3.3 250 0 5 0 vsb50 3.3 250 0 5 3.3 vsb50 3.3 250 5 0 0 vcc50 3.3 250 5 0 3.3 vcc50 3.3 250 5 5 0 vcc50 3.3 250 5 5 3.3 vcc50 3.3 250 pin description terminal name terminal 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 gnd 5 i ground gnd 6 i ground gnd 7 i ground gnd 8 i ground absolute maximum ratings q ? 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 ?^ ?????.???????.1.1w ? electrostatic discharge susceptibility, human body mode???????.??.2kv ? operating ambient temperature range, c t ??????.?????..???.0 j to +70 j ? storage temperature range, storage t ?????.?????.?????? 45 ? j to +125 j ? operating junction temperature range, j t ?????.?????????.. 5 ? j to +130 j ? lead temperature ?] soldering for 10 seconds ?^ , () lead t ???????.?...260 j
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 16 v 1. 0 aat12 0 3 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 load current, l i 0 - 250 ma ambient temperature, c t 0 - 70 j electrical characteristics over recommended operating free-air temperature, c t = 0 to 70 , jj l c = 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 = 250ma 3.135 3.300 3.465 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 = 0ma to 250ma - 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 0.25 - - output current limit limit i out33 output short 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 - g f reverse leakage output current () rev ikg i tested for grounded input aux33, vsb50 or vcc50 = gnd, out33 = 3.3v - - 50 g a threshold voltage, low lo v vsb50 or vcc50 ?? 3.85 4.05 4.25 v threshold voltage, high hi v vsb50 or vcc50 ?? 4.1 4.3 4.5 v auxiliary switch resistance ) switch ( r vsb50 = vcc50 = 0v, aux33 = 3.3v, l i = 150ma - - 0.4 ? ja r without copper for heat spreading - 100 - thermal impedance, junction-to-ambient (note 3) with copper for heat spreading - 70 - j /w
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 4 of 16 v 1. 0 aat12 0 3 note 2 ?g design targets only. not tested in production. note 3 ?g please refer to "thermal information" block diagram
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 16 v 1. 0 aat12 0 3 aux33 vcc50 detector vcc50 3.3v gnd over temperature protection gnd vsb50 detector control out33 vsb50 3.3v low on resistance - - + + gnd gnd
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 16 v 1. 0 aat12 0 3 typical characteristics fig. 1. 3.3v vcc50 cold start fig. 2. 3.3v vux33 cold start
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 16 v 1. 0 aat12 0 3 typical characteristics fig. 3. 3.3v vcc50 power up (vsb50=5v) fig. 4. 3.3v vcc50 power up (aux33=3.3v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 16 v 1. 0 aat12 0 3 typical characteristics fig. 5. 3.3v vsb50 power up (aux33=3.3v) fig. 6. 3.3v vcc50 power down (vsb=5v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 16 v 1. 0 aat12 0 3 typical characteristics fig. 7. 3.3v vcc50 power down (aux33=3.3v) fig. 8. 3.3v load transient response falling .
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 10 of 16 v 1. 0 aat12 0 3 typical characteristics fig. 9. 3.3v load transient response rising
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 16 v 1. 0 aat12 0 3 thermal information to ensure reliable operation of the device, the junc tion temperature of the 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 structur e. there are two components that contribute 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, c t , and the junction power dissipation, p j . the junction temperature, t j , is equal to the following thermal equation ?g t j ? c t ?? p j ?] r jc ?^?? p j ?] r ca ?^ t j ? c t ?? p j ?] r ja ?^ this particular application uses the 8-pin soic package with standard lead frame with a dedicated ground terminal. hence, the maximum power dissi pation allowable for an operating ambient temperature of 70 j , and a maximum junction temperature of 150 j is determined as ?g p j ??] t j ?e c t ?^ / r ja p j ??] 150 ?e 70 ?^ /70 ? 1.1w worst case maximum power dissipation is determined by ?g d p ??] 5.5 ?e 3.135 ?^ 0.25 ? 0.591w normal operating maximum power dissipation is ?g d p ??] 5 ?e 3.3 ?^ 0.25 ? 0.425w note: the thermal characteristics of the aat1203 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 12 of 16 v 1.0 aat12 0 3 thermal information (cont.) application information 1.78 0.591 0.425 25 108 120 150 power-w ambient temperature - xc note: these curves are to be used for guideline purposes only. f or a particular application, a more specijic thermal characteriz ation is required. power dissipation derating curves 4.7 g f 4.7 g f 4.7 g f typical application schematic gnd gnd gnd 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 gnd gnd aat1203 3.3v gnd
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 16 v 1.0 aat12 0 3 package dimension 8-pin sop dimensions in millimeters deminsions in inches symbols 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 14 of 16 v 1.0 aat12 0 3 tape and reel 8-pin sop
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 16 v 1.0 aat12 0 3 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 sop8 back marking
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 16 of 16 v 1.0 aat12 0 3 ordering information

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