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ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 1 of 13 2009/01/12 -2 description the ec49121 series is a low dropout linear regulator with on/off control and ec49121 can discharge output capacitor charge fast. the device operates in the input voltage range from +2.4v to +7.0v and delivers 600ma output current. the ec49121 is available in two types, fixed output voltage type and adjustable output voltage type. the fixed output voltage type is preset at an internally trimmed voltage 1.8v, 2.5v, or 3.3v. other options 1.2v, 1.5v, 2.85v, 3.0v and 3.6v are available by special order only. the output voltage range of the adjustable type is from 1.2v to 5v. the ec49121 (adj type) consists of a 1.175v band gap reference, an error amplifier, and a p-channel pass transistor. other features include short-circuit protection and thermal shutdown protection the ec49121 (fixed type) consists of a 0.95v band gap reference, an error amplifier, and a p-channel pass transistor. other features include short-circuit protection and thermal shutdown protection, the fixed type version has fast respond and discharge feature. the ec49121 series devices are available in sot-23-5l,tsot-23-5l, sc-70-5l packages. features z operat i ng v ol tage range +2 .4 v to +7 . 0v z output vo l tages +1 .0 v to +5 . 0v (0.1v step)(fixed), +1.2v to +5.0v(adj type) z dropout vo l tage 500mv @ 600ma(fixed) z fast response in turn-on transient: 35 s (type.) z low current consumpt i on 60 a (ty pe. ) z shutdown current 0.7 a (type . ) z 2% output vo l tage accuracy (spec i a l 1% highly accurate) z l ow esr capac i tor compat i b l e z h ig h r i pp l e re j ect i on 65 db (type . ) z output current l i m i t protect i on 1.0a (type . ) z short c i rcu i t protect i on: 200ma (type) . z therma l over lo ad shutdown protect i on z contro l output on / off funct i on z sot23-5l ?tsot23-5l and sc-70-5l packages z 100% lead (pb)-free and green (ha l ogen free wi th commerc i a l standard) application z battery-powered equipments z graphic card. z peripheral card. z pcmcia & new card z mini pci & pci-express cards. z digital still camera z cdma/gsm cellular handsets. z laptop, palmtops, notebook computers z portable information application.
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 2 of 13 2009/01/12 -2 block diagram
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 3 of 13 2009/01/12 -2 pin# sot23-5l pin# sc-70-5l symbol function 1 1 v in regulator input pin. 2 2 gnd ground pin. 3 3 en enable pin. 4 4 nc/adj no connection for fixed voltage or adj terminal pin for adjustable voltage. 5 5 v out regulator output pin. ordering information ec49121-xx x x x xx x x package type: b2: sot23-5l t2: tsot23-5l c5: sc-70-5l f: lead free g: green mode vout code: 18=1.8v 25=2.5v 33=3.3v adjustable output en pin type code1: n: none function u: pull high function d: pull low function en pin type code2 h: high active option function l: low active option function output voltage accuracy: 1= 1%, 2= 2% discharge code: f: fast discharge package part number information sot23-5l ec49121-xxnhfb21g tsot23-5l ec49121-xxnhft21g sc-70-5l EC49121-XXNHFC1G the xx character represents output voltage. example: 18=1.8v, 25=2.5v, 33=3.3v, default: adjustable output... the n character represents en pin type code 1: example: n: none function, u: pull high function, d: pull low function the h character represents en pin type code 2 example: h: high active option function, l:low active option function the f character represents discharge c ode. example: f: fast discharge. the b2 or c character represents package type. example: b2: sot23-5l, c: sc-70-5l. the 1 character represents output voltage accuracy. example:1: 1%, 2 : 2% . the last character? f? or ?g? represents lead free code: example: f: lead free, g: green mode. pin assignment pin descriptions sot23-5l/tsot23-5l /sc-70-5l (top view)
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 4 of 13 2009/01/12 -2 package part number marking marking information sot23-5l ec49121-xxnhfb21g tsot23-5l ec49121-xxnhft21g sc-70-5l EC49121-XXNHFC1G 6vfxx the 1st character represents the products series example: part no:ec49121=6 the 2nd character represents the output voltage code. please refer the table1 for output voltage code information. the 3rd character represents the f unction code. please refer the table2 for function code information. the xx character represents ? the date code. there is an under-line on 1st digit for a type package. there is an under-line on 5th digit for pb-free package. there are two under-lines on 4th & 5th digit for green package. there is a top-line on 1 st digit for 1% output voltage accuracy. table1 mark code vs. output voltage code mark voltage mark voltage 4 1.0v m 3.0v 5 1.2v n 3.1v 8 1.5v q 3.3v a 1.8v v 3.6v g 2.5v z 5.0v l 2.85v o adjustable type table2 mark code vs. function code en type en type type type type type mark code code 1 code 2 discharge mark code code 1 code 2 discharge a nhf none high fast g uhn pull high high active normal b nlf none low fast h uln pull high low active normal c nhn none high normal j dhf pull low high active fast d nln none low normal k dlf pull low low active fast e uhf pull high fast l dhn pull low high active normal f ulf pull low fast m dln pull low low active normal marking information
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 5 of 13 2009/01/12 -2 absolute maximum ratings parameter symbol value units input voltage v in to gnd v in 9.0 v output current limit, i (limit) i out 1.0 a junction temperature t j +155 c sot23-5l 155 thermal resistance sc-70-5l ja 333 c/w sot23-5l 400 power dissipation sc-70-5l p d 250 mw operating ambient temperature t opr -40 to +85 c storage temperature t stg -55 to +150 c lead temperature (soldering, 10sec.) ? +260 c esd voltage 1k v note: *the power dissipation of values ar e based on the condition that junction temperature t j and ambient temperature t a difference is 100 *stresses beyond those listed under? absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and function operation of t he device at these to any other conditi ons beyond those indicated under ?recommended operating conditions? is not implied. expos ure to absolute-maximum rated condition s for extended periods may affect device reliability.
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 6 of 13 2009/01/12 -2 electrical characteristics (v in =5v, ta=25 , unless otherwise noted.) symbol parameter test conditions min typ max unit v in input voltage ? 2.4 ? 7.0 v fixed voltage type v in =v out +1.0,v i out =1ma -1% -2% +1% +2% v out output voltage adjustable voltage type v in =v out +1.2,v i out =1ma -1% -2% v out +1% +2% v i max output current (see note *1) v out +1.0v Q v in Q 7.0v, v in R 2.4v 0.6 ? ? a i limit current limit ? ? 1.0 ? a v ref adj pin reference voltage for adjustable voltage type ? 1.175 ? v i out =100ma,v out >3.0v ? 50 ? dropout voltage (for fixed voltage type) i out =600ma,v out >3.0v ? 500 ? v drop dropout voltage (for adj voltage type) i out =600ma,v out >3.0v ? 800 ? mv v out +1.0v v Q in Q 7.0v, i out =1ma for fixed voltage type ? 0.2 0.3 ? v line line regulation v out +1.2v Q v in Q 7.0v,i out 1 ma, vin R 2.8v, for adj voltage type ? ? 0.2 % /v ? v load load regulation v in = v out +1v, 1ma Q i out Q 100ma ? 0.01 0.02 % / ma i q ground pin current i load =0ma to 1a,v in = v out +1.0v ? 60 ? a i sd shutdown current vin = v out +1v, en=0v, no load ? 0.7 ? a i adj adj pin current i load =0ma to 600ma,v in = v out +1.0v ? 0.1 ? a i sc short circuit current ? ? 200 ? ma psrr ripple rejection rate i out =30ma, f=1khz, c out =3.3 f ? 65 ? db e n output noise i out =100ma, f=1khz, c out =3.3 f ? 40 ? v (rms) v i h en pin input voltage ?h? v in Q 5.0v 1.6 ? ? v v il en pin input voltage ?l? v in Q 5.0v ? ? 0.3 v r dis discharge resistor v en =0v, for fixed voltage type ? 30 100 ? t dis discharge time v out =3.3v to 0v, c out =1 f for fixed voltage type ? 70 100 s t sd thermal shutdown temperature ? ? 155 ? c t hys thermal shutdown hysteresis ? ? 20 ? c note: *1) measured using a double sided board with 1?x2? squar e inches of copper area connected to the gnd pins for ?heat spre ading?.
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 7 of 13 2009/01/12 -2 typical performance characteristics
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 8 of 13 2009/01/12 -2 typical performance characteristics (continued)
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 9 of 13 2009/01/12 -2 detail description the ec49121 is a low-dropout linear regulator. the dev ice provides preset 1. 8v, 2.5v and 3.3v output voltages for output current up to 600ma. adjustable out put voltage and other mask options for special output voltages are also available. as illustrated in function bloc k diagram, it consists of a 1.175v band gap (fixed voltage type is 0.95v) reference, an error amplifier, a p-channe l pass transistor and an internal feedback voltage divider. the band gap reference for fixed voltage types is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the vo ltage difference. if the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output pin and increases the output voltage. if the f eedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. the output voltage is feed back through an internal re sistive divider (or external resistive divider for adjustable output voltage type) connected to out pin. a dditional blocks include an output current limiter, thermal sensor, and shutdown logic. internal p-channel pass transistor the ec49121 features a p-channel mosfet pass tr ansistor. unlike similar designs using pnp pass transistors, p-channel mosfet require no base drive, which reduces quiescent current. pnp based regulators also waste considerable current in dr opout when the pass transistor saturates, and use high base-drive currents under large loads. the ec49121 does not suffer from these problems and consumes only 60 a (typ.) of current consumption under heavy loads as well as in dropout conditions. enable function en pin s t ar t s and s t ops t he regula t or . when t he en pin is swi t ched t o t he power o ff level , t he opera t ion o f all in t ernal circui t s t ops , t he build-in p-channel mosfet ou t pu t t ransis t or be t ween pins v in and v out is swi t ched o ff, allowing curren t consump t ion t o be dras t ically reduced . the v out pin enters the gnd level through the internal discharge path between v out and gnd pins . fast discharge function the ec49121 fixed type has f as t discharge func t ion on en pin disable . when user t urns o ff the device , i t s in t ernal pull low resis t or will discharge ou t pu t capaci t or charge . it ?ll avoid o t her device t o arise wrong mo t ions . simplified application circuit
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 10 of 13 2009/01/12 -2 output voltage selection for fixed voltage type of ec49121, the out put voltage is preset at an interna lly trimmed voltage. the first two digits of part number suffix identify the output voltage (see ordering information). for example; the ec49121-33 has a preset 3.3v output voltage. for adjustable voltage type of ec49121, the output volt age is set by comparing the feedback voltage at adjust terminal to the internal band gap reference voltage. the reference voltage v ref is1.175v.the out put voltage is given by the equation: current limit the ec49121 also includes a fold back current limiter . it monitors and controls the pass transistor?s gate voltage, estimates the output current, and limits the output current within 1.0a. thermal overload protection thermal overload protection limits total power dissipa tion of ec49121. when the junction temperature exceeds t j = +150c, a thermal sensor turns off the pass transi stor, allowing the ic to cool down. the thermal sensor turns the pass transistor on again after the juncti on temperature cools down by 20c, resulting in a pulsed output during continuous thermal overload conditions. thermal overload protection is designed to protect t he ec49121 in the event of fault conditions. for continuous operation, the absolute maximum operating junction temperature rating of t j = +125c should not be exceeded. operating region an d power dissipation maximum power dissipation of the ec49121 depends on the thermal resistance of the case and printed circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipation across the devices is p=i out x (v in -v out ). the resulting maximum power dissipation is where (t j -t a ) is the temperature difference between the ec49121 die junction and the surrounding air, jc is the thermal resistance of the package chosen, and ca is the thermal resistance th rough the printed circuit board, copper traces and other materials to the surrounding ai r. for better heat-sinking, the copper area should be equally shared between the v in , v out , and gnd pins. dropout voltage a regulator?s minimum input output voltage differential , or dropout voltage, determines the lowest usable supply voltage. in battery powered syst ems, this will determine the useful end of life battery voltage. the ec49121 uses a p-channel mosfet pass transistor, its dropout voltage is a function of drain-to-source on-resistance (r ds (on) ) multiplied by the load current. ja a j ca jc a j max t t t t p ) ( ) ( ? = + ? = out on ds out in dropout xi r v v v ) ( = ? = 2 1 2 1 xr i r r x v v adj ref out + ? ? ? ? ? ? + = (see typical application schematic)
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 11 of 13 2009/01/12 -2 mechanical dimensions outline drawing sot23-5l
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 12 of 13 2009/01/12 -2 mechanical dimensions outline drawing tsot23-5l dimensions in millimeters symbols min nom max a 0.75 -------------- 0.90 a1 0.00 -------------- 0.10 a2 0.70 0.75 0.80 b 0.30 -------------- 0.50 c 0.08 -------------- 0.20 d 2.80 2.90 3.00 e 2.60 2.80 3.00 e1 1.50 1.60 1.70 e 0.95 bsc e1 1.90 bsc l 0.30 0.45 0.60 l1 0.60 ref l2 0.25 bsc r 0.10 -------------- --------------- r1 0.10 -------------- 0.25 0 4 8 1 4 10 12 note : 1. all dimensions are in millimeters. 2. dimension d does not include mold flash, protrusion or gate burrs. mold flash protrusions or gate burrs shall not exceed 0.15mm per end. dimension e1 does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.15mm per side. 3. the package top may be smaller then the package bottom. dimensions d and e1 are determined at outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 4. dimension ?b? does not include dambar protrusion. allowable dambar protrusion shall be 0.08mm total in excess of the ?b? dimension at maximum material condition. the dambar cannot be located on the lower radius of the foot. minimum space between protrusion and an adjacent lead shall not be less than 0.07mm y ---------------- --------------- 0.10
ec49121 600ma ldo with fast enable and fast discharge function e-cmos corp. ( www.ecmos.com.tw ) page 13 of 13 2009/01/12 -2 mechanical dimensions outline drawing sc-70-5l

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