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advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 400-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 400-ma load current capability with vcc50 or vsb50 or aux33 input source z integrated low r ds (on) switch z regulated output 3.3v (fixed) z output short circuit protection pin configuration description the AAT1204 is a multi-input low-dropout regulator that provides constant output supply 3.3v at the output capable of driving a 400-ma load. the AAT1204 provides regulated power output for systems that have multiple input sources and require constant voltage source with a low-dropout voltage. this is a 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. transitions may occur from one input supply to another without generating a glitch outside of the specification range on 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 soic ) top view
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 functions 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 3.3 400 0 5 0 vsb50 3.3 400 0 5 3.3 vsb50 3.3 400 5 0 0 vcc50 3.3 400 5 0 3.3 vcc50 3.3 400 5 5 0 vcc50 3.3 400 5 5 3.3 vcc50 3.3 400 pin description terminal name no. i/o description vsb50 1 i 5-v standby supply input vcc50 2 i 5-v main supply input out33 3 o 3.3-v regulated output aux33 4 i 3.3-v 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, v ?] vcc50 ?^ ?????.??.????????????... -0.5v~7v ? standby supply voltage, v ?] vsb50 ?^ ??????.????????????? -0.5v~7v ? auxiliary supply voltage, v ?] aux33 ?^ ?????.?????????.?....?.... -0.5v~7v ? output current limit, i ?] limit ?^ ?????????????.?????.????... 1.5a ? continuous power dissipation, p d ?] see note 1 ?^ ?????.????????.?.. 1.1w ? electrostatic discharge susceptibility, hum an body model???????.???.?....2kv ? operating ambient temperature range, t a ??????.?????..????0 j to 70 j ? storage temperature range, tstg?????.?????.???????..-55 j to 150 j ? operating junction temperature range, t j ?????.??????...??....-5 j to 135 j ? lead temperature ?] soldering, 10 second ?^ ,t ?] lead ?^ ???????.????..?...260 j note 1 ?g the device deteriorate with increase in ambient temperature, ta. see thermal information section.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 recommended operating conditions min typ max unit 5-v main supply input, vcc50 4.5 5.5 v 5-v standby supply input, vsb50 4.5 5.5 v 3.3v auxiliary supply input, aux33 3 3.6 v load capacitance, c l 4.23 4.7 5.17 f load current, i l 0 400 ma ambient temperature, t a 0 70 j electrical characteristics over recommended operating free-air temperature, ta = 0 j to 70 j ,cl = 4.7f (unless otherwise noted) parameter test condition min typ max unit vcc50 5-v inputs vsb50 4.5 5 5.5 v out33 3.3-v output iout33 = 400ma 3.135 3.3 3.465 v ? v o ?]?vi?^ line regulation voltage vsb50 or vcc50 = 4.5v to 5.5v 2 mv ? v o ?]?io?^ load regulation voltage 20 ma ?? i l ?? 400 ma 40 mv i 50 quiescent supply current from vcc50 vsb50 terminals, i l = 0 to 400ma 1.0 3.0 ma i aux from aux33 terminal, il = 0a 1.0 3.0 ma i l33 out33 load current 0.4 i limit output current limit out33 output short to 0v 1.5 a t tsd thermal shutdown ?] note 2 ?^ 150 180 t hys thermal hysteresis ?] note2 ?^ 15 j c l load capacitance minimal esr to insure stability of regulated output 4.7 g f i ikg ?] rev ?^ reverse leakage output current tested for input that is grounded. aux33, vsb50 or vcc50 = gnd, out33 = 3.3v 50 g a v lo threshold voltage, low vsb50 or vcc50 ?? 4.0 4.2 4.4 v v hi threshold voltage, high vsb50 or vcc50 ?? 4.25 4.45 4.65 v r ?] switch ?^ auxiliary switch resistance vsb50 = vcc50 = 0v, aux33 = 3.3v, i l = 150ma 0.4 ? without copper for heat spreading 100 r ja thermal impedance, junction-to-ambient ?] note3 ?^ with copper for heat spreading 70 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 . v 1.0 aat12 0 4 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 . v 1.0 aat12 0 4 typical characteristics figure 1. 3.3v vcc50 cold start figure 2. 3.3v aux33 cold start
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 typical characteristics figure 3. 3.3v vcc50 power up(vsb50=5v) figure 4. 3.3v vcc50 power up(aux33=3.3v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 typical characteristics figure 5. 3.3v vsb50 power up(aux33=3.3v) figure 6. 3.3v vcc50 power down(vsb=5v)
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 typical characteristics figure 7. 3.3v vcc50 power down(aux33=3.3v) figure 8. 3.3v load transient response falling . typical characteristics
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 figure 9. 3.3v load transient response rising
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 thermal information to ensure reliable operation of the device, the junction 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 structure. th ere are two components that contribu te to thermal resistance. they consist of two paths in series. the first is the junction to case thermal resistance, r jc ; the second 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 the ability to efficiently dissipate the heat from the junction is a function of the package style and board layout incorporated in the application. the operating junction temperature is dete rmined by the operation ambient temperature, t a , and the junction power dissipation, p j . the junction temperature, t j , is equal to the following thermal equation ?g t j ? t a ?? p j ?] r jc ?^?? p j ?] r ca ?^ t j ? t a ?? p j ?] r ja ?^ this particular application uses the 8-pin so package with standard lead frame with a dedicated ground terminal. hence, the maximum power dissipation 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 t a ?^ / r ja p j ??] 150 ?e 70 ?^ /70 ? 1.1w worst case maximum power dissipation is determined by ?g p d ??] 5.5 ?e 3.135 ?^ 0.4 ? 0.946w normal operating maximum power dissipation is ?g p d ??] 5 ?e 3.3 ?^ 0.4 ? 0.68w note: the thermal characteristics of the AAT1204 were measured using a double-sided board with two square inches of copper area connected to th e 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 . v 1.0 aat12 0 4 1.78 0.946 0.68 25 83 102 150 power-w ambient temperature - xc thermal information 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
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 application information 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 AAT1204 3.3v gnd
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? advanced analog technology, inc . v 1.0 aat12 0 4 package dimension dimension in mils dimension in mm symbol min nom max min nom max a 59 63 67 1.498 1.600 1.702 a1 22 24 26 0.56 0.610 0.66 b 12 16 20 0.305 0.406 0.508 d 188 190 192 4.775 4.826 4.877 e1 152 154 156 3.861 3.912 3.962 eb 229 235 241 5.816 5.969 6.121 l 24 -- -- 0.6 -- -- c 0o 3o 6o 0o 3o 6o d 50typ. b a1 6(min) 7x(4x) e1 7x(4x) eb l c 8ref.

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