esmt/emp EML3020 elite semiconductor memory technology inc./elite micropower inc. publication date : jan. 2011 revision : 1.1 1/15 1.5mhz 1a, synchronous step-down regulator general description EML3020 is a high efficiency step down dc/dc converter. it features an extremely low quiescent current, which is suitable for reducing standby power consumption, especially for portable applications. the device can accept input voltage from 2.5v to 5.5v and deliver up to 1a output current. high 1.5mhz switching frequency allows the use of small surface mount inductors and capacitors to reduce overall pcb board space. furthermore, the built-in synchronous switch improves efficiency and eliminates external schottky diode. EML3020 uses different modulation algorithms for various loading conditions: (1) pulse width modulation (pwm) for low output voltage ripple and fixed frequency noise, (2) pulse frequency modulation (pfm) for improving light load efficiency, and (3) low dropout (ldo) mode for providing 100% duty cycle operation during heavy loading. adopting low reference voltage design reduces regulated output to 0.6v. the adjustable version of this device is available in both of tdfn-6 2x2mm and sot-23-5 package. features ? achieve 97% efficiency ? input voltage : 2.5v to 5.5v ? output current up to 1a ? reference voltage: 0.6v ? quiescent current 15 a with no load ? internal switching frequency: 1.5mhz ? no schottky diode needed ? low dropout operation: 100% duty cycle ? shutdown current < 1 a ? excellent line and load transient response ? over-temperature protection applications ? blue-tooth devices ? cellular and smart phones ? personal multi-media player (pmp) ? wireless networking ? digital still cameras ? portable applications typical application vin sw vfb 34 6 cin* 4.7uf vin cout* 10uf vout (3.3v) en EML3020 run 2 gnd * ceramic capacitor 5 2.2uh 22pf r2 (450k ) r1 (100k ) fig. 1
esmt/emp EML3020 elite semiconductor memory technology inc./elite micropower inc. publication date : jan. 2011 revision : 1.1 2/15 package configuration tdfn-6 (2x2mm) sot-23-5 EML3020-00fe06nrr 00 adjustable fe06 tdfn-6 (2x2mm) package nrr rohs & halogen free package commercial grade temperature rating: -40 to 85c package in tape & reel EML3020-00vf05nrr 00 adjustable vf05 sot-23-5 package nrr rohs & halogen free package commercial grade temperature rating: -40 to 85c package in tape & reel order, mark & packing information package vout(v) product id marking packing tdfn-6 adjustable EML3020-00fe06nrr pin1 dot 3020 tracking code 1 2 3 6 5 4 tape & reel 3k units sot-23-5 adjustable EML3020-00vf05nrr tape & reel 3k units
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