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mic5281 120v in , 25ma, ultra-low i q , high-psrr linear regulator 4-0 micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 94 800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com june 2011 general description the mic5281 high-performance linear regulator offers a very-wide input operating voltage range, up to 120v dc, and supplies an output current of up to 25ma. ideal for high input voltage applications such as industrial and telecom, the mic5281 offers 3% initial accuracy, extremely high-power supply rejection ratio (>90db) and ultra-low quiescent current of 6a. the mic5281 is optimized for high-voltage line transients, making it ideal for harsh environment applications. the mic5281 is offered in both fixed output voltage (3.3v/5.0v) and adjustable output voltage (1.27v to 5.5v) options. the mic5281 operates over a ? 40oc to +125oc temperature range and is available in lead-free, rohs- compliant, 8-pin epad msop and 8-pin msop packages. data sheet and support documentation are found on the micrel website: www.micrel.com . features ? wide input voltage range: 6v to 120v dc ? ultra-low quiescent current: 6a ? 25ma guaranteed output current ? adjustable output from 1.27v to 5.5v ? withstands up to +120v dc at the input ? stable with ceramic capacitors ? ultra-high psrr >90db ? ultra-high line rejection (load dump) ? high output accuracy: ? 3% initial accuracy ? thermal-shutdown and cu rrent-limit protection ? thermally-efficient, 8-pin msop and 8-pin epad msop packages applications ? industrial applications ? remote keyless entry power supply ? telecom applications ? off-line power supplies ___________________________________________________________________________________________________________ typical applications quiescent suppl y current vs. input voltage 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 0 20 40 60 80 100 120 input voltage (v) quiescent current (a) v out = 5v i out = 0 m9999-062411-a
micrel, inc. mic5281 june 2011 2 m9999-062411-a ordering information part number output voltage top mark temperature range package lead finish mic5281ymme adjustable 781a ?40c to + 125 c 8-pin epad msop pb-free mic5281-3.3ymme 3.3v 781s ?40c to + 125 c 8-pin epad msop pb-free mic5281-5.0ymme 5.0v 7815 ?40c to + 125 c 8-pin epad msop pb-free mic5281ymm adjustable ? ?40c to + 125 c 8-pin msop pb-free mic5281-3.3ymm 3.3v ? ?40c to + 125 c 8-pin msop pb-free mic5281-5.0ymm 5.0v ? ?40c to + 125 c 8-pin msop pb-free pin configuration 8-pin epad msop mic5281-x.xymme (top view) 8-pin msop mic5281-x.xymm (top view) 8-pin epad msop mic5281ymme (top view) 8-pin msop mic5281ymm (top view)
micrel, inc. mic5281 june 2011 3 m9999-062411-a pin description pin mic5281ymme mic5281-x.xymme mic5281ymm mic5281-x.xymm name function 1 1 1 1 vin supply voltage input. connect 1f capacitor from vin to gnd. 2, 3, 7 2, 3, 7 2, 3, 7 2, 3, 7 nc not internally connected. connect nc to gnd or leave unconnected. 4 4 4 4 cpsrr bypass capacitor connection. connect 0.1f capacitor from cpsrr to gnd. 5 5 5 5 gnd ground. 6 ? 6 ? fb feedback connection. for external resistor divider to set v out . ? 6 ? 6 sns sense input. connect sns to vout. 8 8 8 8 vout regulator output. connect 10f capacitor from vout to gnd. ep ep ? ? ep exposed pad (epad) for thermal relief. connect ep to gnd.
micrel, inc. mic5281 june 2011 4 m9999-062411-a absolute maximum ratings (1) v in to gnd................................................... ?0.3v to +125v v cpsrr to gnd..................................................?0. 3 to +14v v fb , v sns , v out to gnd ................................... ?0.3v to +6v lead temperature (soldering, 10s) .......................... +260c junction temper ature ......................... ?40c t j +125c storage temper ature .........................?65c t a +150c esd ratings (4) hbm ......................................................................... 2kv mm .........................................................................200v operating ratings (2) v in ................................................................. +6v to +120v v out adjust r ange ..................................... +1. 27v to +5.5v junction temper ature ......................... ?40c t j +125c power dissipation (p d )........................... internally limited (3) junction thermal resistance ( ja ) 8-pin epad msop..............................................64c/w 8-pin ms op .....................................................160 c/w electrical characteristics (5) v in = 12v, c in = 1.0f, c psrr = 0.1f, c out = 10f, v out = 5.0v or 3.3v, i out = 100a, t a = 25 c, bold values indicate ?40c t j +125 c, unless noted. parameter condition min. typ. max. units power supply input input voltage range (6) 6 120 v quiescent supply current i out = 0 6 11 a output voltage adjustable 1.27 5.5 3.2 3.3 3.4 fixed 3.3v 3.13 3.3 3.47 4.85 5.0 5.15 output voltage fixed 5.0v 4.75 5.0 5.25 v ? 3 +3 % output voltage accuracy variation from nominal v out ? 5 +5 % load regulation i out = 100a to 25ma ? 0.5 0.2 +0.5 % line regulation (7) v in = 10v to 120v ? 0.5 0.04 +0.5 %/v feedback input (adjustable) 1.232 1.270 1.308 fb voltage 1.206 1.270 1.333 v fb current v fb = 1.27v 3.2 na current limit current limit v out = 0v 30 65 130 ma ripple rejection power supply rejection ratio f = 20khz to 2mhz > 90 db notes: 1. exceeding an absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation at any t a (ambient temperature) is p d(max) = (t j(max) ? t a ) / ja . exceeding the maximum allowable power dissipation results in excessive die temperature, and causes the regulator to enter thermal shutdown. 4. devices are esd sensitive; use proper handling precautions. 5. specifications are for packaged products only. 6. assure that v in (v out + 3v) and v in 6v. 7. line regulation is a percentage of v out .
micrel, inc. mic5281 june 2011 5 m9999-062411-a electrical characteristics (5) (continued) v in = 12v, c in = 1.0f, c psrr = 0.1f, c out = 10f, v out = 5.0v or 3.3v, i out = 100a, t a = 25 c, bold values indicate ?40c t j +125 c, unless noted. parameter condition min. typ. max. units power dropout voltage dropout voltage i out = 25ma 2 3 v thermal protection thermal-shutdown temperature t j rising 157 c thermal-shutdown hysteresis 15 c
micrel, inc. mic5281 typical characteristics output voltage vs. input voltage 4.90 4.95 5.00 5.05 5.10 5.15 quiescent supply current vs. input voltage 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 quiescent supply current vs. temperature 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 june 2011 6 m9999-062411-a 0.0 quiescent current (a) 0 20 40 60 80 100 120 input voltage (v) v out = 5v i out = 0 0.0 quiescent current (a) -50 -25 0 25 50 75 100 125 temperature (c) v in = 12v v out = 5v i out = 0ma 4.85 0 20 40 60 80 100 120 output voltage (v) input voltage (v) v in = 12v v out = 5v i out = 5ma output voltage vs. output current 4.75 0 5 10 15 20 25 output current (ma) output voltage vs. temperature 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 -50 -25 0 25 50 75 100 125 temperature (c) dropout voltage vs. output current 0.00 0.50 1.00 1.50 2.00 2.50 3.00 0 5 10 15 20 25 output current (ma) 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 output voltage (v) v in = 12v v out = 5v v in = 12v v out = 5v i out = 5ma v out = 5v dropout voltage (v) a djustable option output voltage (v) dropout voltage vs. temperature 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 dropout voltage (v) -50 -25 0 25 50 75 100 125 temperature (c) v out = 5v i out = 25ma fb voltage vs. input voltage 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 fb voltage (v) 0 20406080100120 input voltage (v) v out = 5v i out = 5ma fb current vs. input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 fb current (na) 0 20 40 60 80 100 120 input voltage (v) v out = 5v v fb = 1.267v
micrel, inc. mic5281 typical characteristics (continued) fb voltage vs. temperature 1.24 1.25 1.26 1.27 1.28 1.29 1.30 1.31 -50 -25 0 25 50 75 100 125 temperature (c) fb current vs. temperature 0.0 0.5 1.0 1.5 2.0 2.5 -50 -25 0 25 50 75 100 125 temperature (c) fb voltage vs. output current 1.266 1.268 1.270 1.272 1.274 1.276 0 5 10 15 20 25 output current (ma) v in = 12v v out = 5.0v v in = 12v v out = 5v i out = 5ma v in = 12v v fb = 1.267v i out = 0 fb voltage (v) fb voltage (v) fb current (na) current limit vs. temperature 50 55 60 65 70 75 80 -50 -25 0 25 50 75 100 125 temperature (c) load regulation vs. temperature 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 0.30 -50 -25 0 25 50 75 100 125 temperature (c) line regulation vs. temperature 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 -50 -25 0 25 50 75 100 125 temperature (c) v in = 10v to 120v v out = 5v i out = 100a v in = 12v v out = 5v i out =100a to 25ma line regulation (%/v) load regulation (%) v in = 12v v out = 0v current limit (ma) power dissipation vs. output current 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 power dissipation (w) 0 5 10 15 20 25 output current (ma) v in = 12v v out = 4.5v case temperature (mme) vs. output current 24 26 28 30 32 34 36 38 40 case temperature (c) 0 5 10 15 20 25 output current (ma) v in = 12v v out = 4.5v psrr vs. frequency -130 -110 -90 -70 -50 -30 -10 10 30 psrr (db) 0.01 0.1 1 10 100 1000 10000 frequency (khz) v in = 12v v out = 5v i out = 5ma c in = none c psrr = 0.1f c out = 10f june 2011 7 m9999-062411-a
micrel, inc. mic5281 june 2011 8 m9999-062411-a functional characteristics
micrel, inc. mic5281 june 2011 9 m9999-062411-a functional characteristics (continued)
micrel, inc. mic5281 june 2011 10 m9999-062411-a detailed description the mic5281 voltage regulator ac cepts a 6v to 120v input and has an ultra-low 6a typical quiescent current while offering an excellent line transient response and psrr. these features make it ideal for harsh, noisy environments. all options of the device offer 25ma of output current. the mic5281ymm and mic5281ymme offer an adjustable output voltage from 1.27v to 5.5v. the mic5281-3.3ymme and mic5281-3.3ymm offer fixed 3.3v outputs and the mic5281-5.0ymme and mic5281- 5.0ymm offer fixed 5.0v out puts. the ymme packaged devices feature a heat slug to more effectively remove heat from the die. applications information thermal protection mic5281 has internal thermal s hutdown to protect it from excessive heating of t he die. when the junction temperature exceeds approxim ately +155c, the output is disabled and the device begins to cool down. the device turns back on when the junction temperature cools by 15c. this will result in a cycled output during continuous thermal-overload conditions. current limit mic5281 features output curr ent-limit protection. the output sustains a continuous short circuit to gnd without damage to the device, but ther mal shutdown often results. input capacitor connect a 1.0f capacitor from vin to gnd. micrel recommends the c5750x7r2e105m, 1.0f, 250v capacitor made by tdk. when using a different capacitor, assure that the voltage rating of the capacitor exceeds any potential transient. cpsrr capacitor connect a 0.1f capacitor from cpsrr to gnd to maintain high power supply rejection. the voltage rating of the capacitor must be at least 14v. output capacitor connect a 10f capacitor from vout to gnd. assure that the voltage rating of the capacitor exceeds the designed output voltage of the mic5281. output voltage setting for the mic5281ymme and mic5281ymm, v out is programmed from 1.27v to 5.5v using: ? ? ? ? ? ? += 1 r2 r1 vv ref out where v ref = 1.267v, and r1 and r2 are shown in the typical applications circuit. thermal measurements it is always wise to measure an ic?s case temperature to make sure that it is within operating limits, but it is easy to get erroneous results. the standard thermal couple that comes with many voltage meters uses a large wire gauge that behaves like a heat-sink, resulting in artificially low case temperature measurements. use a thermocouple of 36-gauge wire or smaller, such as the omega (5sc-tt-k- 36-36), to minimize the heat-sinking effect. also, apply thermal compound to maximize heat transfer between the ic and the thermocouple. an infrared thermometer is a recommended alternative. the ir thermometer from op tris has a 1mm spot size, ideal for monitoring small surface mount packages. also, the optional stand makes it easy to keep the beam on the ic for long periods of time.
micrel, inc. mic5281 june 2011 11 m9999-062411-a functional diagram
micrel, inc. mic5281 june 2011 12 m9999-062411-a mic5281 evaluation board schematic mic5281 evaluation board schematic
micrel, inc. mic5281 june 2011 13 m9999-062411-a bill of materials item part number manufacturer description qty. c1 c5750x7r2e105m tdk (1) 1.0f, 250v, 20%, x7r capacitor (2220) 1 c2 08053c104kat2a avx (2) 0.1f 25v 20%, x5r capacitor (0805) 1 c3 0805zd106kat2a avx (2) 10f, 10v, 20%, x5r, capacitor (0805) 1 c4 open panasonic (3) 100f, 160v, 20% capacitor (alu, 0.492"diameter can 0.197"lead spacing - part # eca-2cm101) 0 c5 open any capacitor 0 r1 crcw06030000f vishay/dale (4) 0 , 1% resistor, 0603 1 r2 crcw06032942f vishay/dale (4) 29.4k , 1% resistor, 0603 1 r3 crcw06031002f vishay/dale (4) 10.0k , 1% resistor, 0603 1 r4 crcw06031822f vishay/dale (4) 18.2k , 1%, resistor, 0603 1 r5 crcw06033012f vishay/dale (4) 30.1k , 1% resistor chip, 0603 1 r6 crcw06036982f vishay/dale (4) 69.8k , 1%, resistor, 0603 1 u1 mic5281ymme micrel (5) 120v in , 25ma, ultra-low i q , high-psrr linear regulator 1 notes: 1. tdk: www.tdk.com . 2. avx.: www.avx.com . 3. panasonic: www.panasonic.com . 4. vishay tel: www.vishay.com . 5. micrel, inc.: www.micrel.com .
micrel, inc. mic5281 june 2011 14 m9999-062411-a pcb evaluation board layout top layer silk screen top layer traces
micrel, inc. mic5281 june 2011 15 m9999-062411-a pcb evaluation board layout (continued) bottom layer traces bottom layer silk screen
micrel, inc. mic5281 june 2011 16 m9999-062411-a pcb evaluation board layout (continued) ev board dimensions
micrel, inc. mic5281 june 2011 17 m9999-062411-a package information 8-pin msop
micrel, inc. mic5281 june 2011 18 m9999-062411-a package information (continued) 8-pin exposed pad (epad) msop
micrel, inc. mic5281 june 2011 19 m9999-062411-a recommended landing pattern 8-pin msop
micrel, inc. mic5281 june 2011 20 m9999-062411-a recommended landing pattern (continued) 8-pin exposed pad (epad) msop red circle indicates thermal via. size should be .300mm ? .350mm in diameter, 1.00mm pitch, and it should be connected to gnd plane for maximum thermal performance.
micrel, inc. mic5281 june 2011 21 m9999-062411-a micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or comple teness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authorized for use as components in life suppor t appliances, devices or systems where malfu nction of a product reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical impla into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages re sulting from such use or sale. can nt ? 2011 micrel, incorporated.

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