rev. 10/2/00 AS2811 10a low dropout voltage regulator fast response, adjustable & fixed proposed specification features applications ? adjustable output down to 1.2v ? powering intel pentium ? p from +5v supplies ? output current of 10a ? power pc ? supplies ? low dropout voltage 1.1v typ ? smps post-regulator ? extremely tight load and line regulation ? high efficiency ?green? computer systems ? current & thermal limiting ? high efficiency linear power supplies ? standard 3-terminal low cost to-220 ? portable instrumentation ? similar to industry standard lt1584 ? constant current regulators ? adjustable power supplies ? battery charger product description the AS2811 is a low power 10a adjustable and fixed voltage regulator that is very easy to use. it requires only two external re sistors to set the output voltage for the adjustable version. the AS2811 is designed for low voltage applications that offer lower dro pout voltage and faster transient response. this device is an excellent choice for use in powering low voltage microprocessor that require a lower dropout, faster transient response to regulate from +2.5v to 3.8v supplies and as a post regulator for switching supplies applications. the AS2811 features low dropout of a maximum 1.2 volts. the AS2811 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive a nd negative transient voltage. on-chip trimming adjusts the reference voltage to 1%. the i q of this device flows into the load which increases efficiency. the AS2811 is offered in a 3-pin to-220 and to-263 package type, compatible with older 3 terminal regulators. for a 8a low dropout regulator refer to the as2880 datasheet. ordering information to-220 3-pin to-263 3-pin AS2811au AS2811at AS2811au-3.3 AS2811at-3.3 consult with factory for other fixed output voltages. pin connections front view to-220-3 (u) AS2811 1 23 adj/gnd v out v in top view to-263-3 (t) 1 AS2811 2 3 adj/gnd v out v in
rev. 10/2/00 AS2811 absolute maximum ratings lead temp. (soldering, 10 seconds) .............................. 300c operating input voltage ................................. .. 7v storage temperature range ............................ -65 to +150c operating junction temperature range AS2811 control section ............................0c to +125c AS2811 power transistor..........................0c to +150c electrical characteristics (note 1) at i out = 10ma, t a =25 c, unless otherwise specified. parameter conditions AS2811 min typ max units 3.3v version output voltage AS2811-3.3v, 0 i out 1.5a, 4.75v v in 7v 3.270 3.240 3.3 3.330 3.360 v reference voltage AS2811-1.5v (v in - v out ) 3v, 10ma i out 7a 1.238 1.225 1.250 1.262 1.275 v output voltage AS2811-3.3, 0 i out 5a, 4.75v v in 7v note 4 3.270 3.235 3.300 3.330 3.365 v min. load current 1.5v (v in - v out ) 5.75v 5 10 ma line regulation AS2811-2.75v v in 7v, i out =10ma, t j =25 c 0.005 0.005 0.2 0.2 % AS2811-3.3, 4.75v v in 7v, i out =0ma, t j =25 c 0.005 0.005 0.2 0.2 load regulation AS2811,10 i out i fl a, (v in -v out )=3v, t j =25 c 0.05 0.005 0.3 0.5 % AS2811-3.3,0 i out i fl a, v in =5v, t j =25 c 0.05 0.005 0.3 0.5 dropout voltage i out =i fullload , ? v ref =1% 1.1 1.2 v current limit AS2811, v in =7v 11.0 12.0 a long term stability t a =125 c, 1000hrs. 0.3 1 % thermal regulation AS2811, 30ms pulse 0.004 0.020 %/w temperature stability 0.5 % output noise, rms 10hz to 10khz 0.003 % v o to-220 control section power transistor thermal resistance junction-to-case to-263 control section power transistor 0.65 2.7 0.65 2.7 c/w the bold specifications apply to the full operating temperature range. note 1: changes in output voltage due to heating effects are covered under the specification for thermal regulation. note 2: a 10 f output capacitor is required on AS2811.
rev. 10/2/00 AS2811 typical characteristics
rev. 10/2/00 AS2811 typical applications in out adj +5v 3.45v AS2811 c 1 r 1 r 1 powering intel pentium tm with AS2811 v in intel pentium tm c 2 v cc pentium processor is a trademark of intel corp. power pc is a trademark of ibm corp. in out adj AS2811 v out typical adjustable regulator v in load adj AS2811 10a current output regulator v in c 1 out in v out = v ref (1 + r 2 ) + i adj r 2 r 1 r 1 c 1 c 2 r 1 r 2 v ref
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