1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 1 - htc features ? high current capability 1.5a ? low dropout voltage 350mv ? low ground current ? accurate 1% guaranteed initial tolerance ? extremely fast transient response ? reverse-battery and "load dump" protection ? zero-current shutdown mode(5-pin version) ? error flag signals output out-of-regulation (5-pin version) ? also characterized for smaller loads with industry -leading performance specifications ? fixed voltage and adjustable versions ? moisture sensitivity level 3 application ? battery powered equipment ? high-efficiency " green" computer system ? automotive electronics ? high-efficiency linear power supplies ? high-efficiency post-regulator for switching supply descripsion to-220 3l / 5l pkg to-263 3l / 5l pkg to-252 3l / 5l pkg ordering information device package lm27150t-x.x to-220 3l / 5l lm27151t-x.x lm27152t lm27150r-x.x to-263 3l / 5l lm27151r-x.x lm27152r lm27150rs-x.x to-252 3l / 5l lm27151rs-x.x lm27152rs x.x = output voltage = 1.5, 1.8, 2.5, 3.0, 3.3, 5.0, 12 the lm27150, lm27151 and lm27152 are high current, high accuracy, and low-dropout voltage regulators. using process with a pnp pass element, these regulator s feature 350mv (full load) dropout voltages and very low ground current. these devices also find applications in lower current, low dropout-critical systems, where their tiny dropout voltage and ground curre nt values are important attributes. the lm27150, lm27151 and lm27152 are fully protected a gainst over current faults, reversed input polarity, reversed lead insertion, over temperature opera tion, and positive and negative transient voltage spikes. lm27151 features logic level enable control and an error flag which signals whenever the output falls out of regulation. on the lm27151 and lm27152, the enable pin may be tied to vin if it is not required for on/off control. absolute maximum ratings characteristic symbol min. max. unit input supply voltage v in - 20 + 30 v lead temperature(soldering, 5 sec) t sol - 260 storage temperature range t stg - 65 + 150
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 2 - htc recommended operating ratings characteristic symbol min. max. unit operating input voltage v in - + 26 v junction temperature t j - 40 + 125 ordering information v out package order no. description supplied as status 1.5 v to-220 3l lm27150t-1.5 1.5a, fixed tube contact us to-220 5l lm27151t-1.5 1.5a, fixed, enable tube contact us to-263 3l lm27150r-1.5 1.5a, fixed reel contact us to-263 5l lm27151r-1.5 1.5a, fixed, enable reel contact us to-252 3l lm27150rs-1.5 1.5a, fixed reel contact us to-252 5l lm27151rs-1.5 1.5a, fixed, enable reel contact us 1.8 v to-220 3l lm27150t-1.8 1.5a, fixed tube contact us to-220 5l lm27151t-1.8 1.5a, fixed, enable tube contact us to-263 3l lm27150r-1.8 1.5a, fixed reel contact us to-263 5l lm27151r-1.8 1.5a, fixe d, enable reel contact us to-252 3l lm27150rs-1.8 1.5a, fixed reel contact us to-252 5l lm27151rs-1.8 1.5a, fixed, enable reel contact us 2.5 v to-220 3l lm27150t-2.5 1.5a, fixed tube contact us to-220 5l lm27151t-2.5 1.5a, fixed, enable tube contact us to-263 3l lm27150r-2.5 1.5a, fixed reel contact us to-263 5l lm27151r-2.5 1.5a, fixed, enable reel contact us to-252 3l lm27150rs-2.5 1.5a, fixed reel contact us to-252 5l lm27151rs-2.5 1.5a, fixed, enable reel contact us 3.0 v to-220 3l lm27150t-3.0 1.5a, fixed tube contact us to-220 5l lm27151t-3.0 1.5a, fixed, enable tube contact us to-263 3l lm27150r-3.0 1.5a, fixed reel contact us to-263 5l lm27151r-3.0 1.5a, fixed, enable reel contact us to-252 3l lm27150rs-3.0 1.5a, fixed reel contact us to-252 5l lm27151rs-3.0 1.5a, fixed, enable reel contact us 3.3 v to-220 3l lm27150t-3.3 1.5a, fixed tube contact us to-220 5l lm27151t-3.3 1.5a, fixed, enable tube contact us to-263 3l lm27150r-3.3 1.5a, fixed reel contact us to-263 5l lm27151r-3.3 1.5a, fixed, enable reel contact us to-252 3l lm27150rs-3.3 1.5a, fixed reel contact us to-252 5l lm27151rs-3.3 1.5a, fixed, enable reel contact us
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 3 - htc ordering information v out package order no. description supplied as status 5.0 v to-220 3l lm27150t-5.0 1.5a, fixed tube contact us to-220 5l lm27151t-5.0 1.5a, fixed, enable tube contact us to-263 3l lm27150r-5.0 1.5a, fixed reel contact us to-263 5l lm27151r-5.0 1.5a, fixe d, enable reel contact us to-252 3l lm27150rs-5.0 1.5a, fixed reel contact us to-252 5l lm27151rs-5.0 1.5a, fixed, enable reel contact us 12 v to-220 3l lm27150t-12 1.5a, fixed tube contact us to-220 5l lm27151t-12 1.5a, fixed, enable tube contact us to-263 3l lm27150r-12 1.5a, fixed reel contact us to-263 5l lm27151r-12 1.5a, fixed, enable reel contact us to-252 3l lm27150rs-12 1.5a, fixed reel contact us to-252 5l lm27151rs-12 1.5a, fixed, enable reel contact us adj to-220 5l lm27152t 1.5a, adjustable, enable tube contact us to-263 5l lm27152r 1.5a, adjustable, enable reel contact us to-252 5l lm27152rs 1.5a, adjustable, enable reel contact us package type root name product code lm 2715x output voltage : 1.5v / 1.8v / 2.5v / 3.0v / 3.3v / 5.0v / 12v / blank(adj only) t r rs : to-220 : to-263 : to-252 27150 : 3l fixed output 27151 : 5l fixed output 27152 : 5l adjustable output
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 4 - htc pin configuration to-263 3l to-263 5l to-252 3l to-252 5l to-220 3l to-220 5l pin description pin no. to-220 / to-263 / to-252 3l (for lm27150) to-220 / to-263 / to-252 5l (for lm27151/2) name function name function 1 v in input supply en chip enable 2 gnd ground v in input supply 3 v out output voltage gnd ground 4 - - v out output voltage 5 - - flg / adj error flag output or output adjust 3 output 2 gnd 1 input 3 output 2 gnd 1 input 5 flg / adj 4 output 3 gnd 2 input 1 en 5 flg/adj 4 output 3 gnd 2 input 1 en 5 flg / adj 4 output 3 gnd 2 input 1 en 3 output 2 gnd 1 input
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 5 - htc typical application - typical fixed output application - typical adjustable output application in out en adj gnd c out + r1 r2 c in + v out v in lm27152 v out = v ref x [1 + (r1/r2)] * * for best results, the total series resistance should be small enough to pass the minimum regulator load current.
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 6 - htc electrical characteristics i out =100ma, t j =25 , unless otherwise specified. bold values are guaranteed across th e operating temperature range. adjustable versions are programmed to 5.0v. symbol parameter condition min typ max units v out output voltage i o = 10ma -1 1 % 10ma i o i fl , (v out +1v) v in 26v -2 2 v line line regulation i o = 10ma, (v out +1v) v in 26v 0.06 0.5 % v load load regulation v in =v out +5v, 10ma i out i fulload (note 1) 0.2 1 % vo/ t output voltage temp. coefficient output voltage (note 2) , temp. coefficient 20 100 ppm/ v do dropout voltage v out = -1%, (note 1.3) i o =100ma i o =750ma i o =1.5a 100 250 350 200 600 mv i gnd ground current i o =750ma, v in =v out +1v (note 1.4) i o =1.5a 8 22 20 ma i gnddo ground pin current at dropout v in =0.5v less than specified v out , i out =10ma (note 5) 2 ma i limit current limit lm27150, v out = 0v (note 1) 2.1 3.5 a e n output noise voltage (10hz to 100khz) i l = 100ma c l =10 f c l =33 f 400 260 vrms flag output (error comparator) lm27151 i flg (leak) output leakage current v oh =26v 0.01 1.00 2.00 a v flg (do) output low voltage device set for 5v. v in =4.5v i ol =250 a (note 5) 220 300 400 mv v flg upper threshold voltage device set for 5v (note 5) 40 25 60 mv lower threshold voltage device set for 5v (note 5) 75 95 140 mv hysteresis device set for 5v (note 5) 15 mv
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 7 - htc reference lm27152 v ref reference voltage 1.228 1.215 1.24 1.252 1.265 v (note 6) 1.203 1.277 v i adj adjust pin bias current 40 80 120 na reference voltage temp. coefficient (note 2) 20 ppm/ adjust pin bias current temp. coefficient 0.1 na/ enable input lm27151 / lm27152 v en enable input voltage logic low (off) logic high (on) 2.4 0.8 v i en enable pin input current v en =26v 100 600 750 a v en =0.8v 2.5 5 a regulator output current shutdown (note 7) 10 500 a note 1. employ pulse-testing procedur es to minimize temperature rise note 2. output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature ran ge. note 3. dropout voltage is defined as the input-to-output differen tial when the output voltage drops to 99% of its nominal valu e with v+1v applied to voutin. for output voltages below 2.3v the dr opout voltage is the input-to-output voltage differential with the minimum input voltage being 2.3v. the minimum input operation voltage is 2.3v. note 4. gnd pin current is the regulator quiescent current. the total current drawn from the source is a sum of the load curren t plus the gnd pin current. note 5. for specified vout 2.5v. note 6. v vrefout (vin-1v), 2.3v vin 26v, 10ma i 1.5a, tlj 1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 8 - htc typical operating characteristics lm27150 dropout voltage vs, output current lm27150 dropout voltage vs, temperature lm27150-5.0 dropout characteristics lm27150 ground current vs, supply voltage lm27150 ground current vs, tempe r ature lm27150 ground current vs, temperature lm27150-3.3 output voltage vs. temperature lm27150-3.3 short circuit current vs. tem p erature lm27150 ground current vs. input voltage
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 9 - htc application information the lm27150 are high performance low-dropout voltage regulators suitable for all moderate to high current voltage regulator applications. their 350mv dropout vo ltage at full load makes them especially valuable in battery powered systems and as high efficiency noise f ilters in "post-regulator" applications. unlike older npn-pass transistor designs, dropout performance of the pnp output of these devices is limited merely by the low v ce saturation voltage. the lm27150 family of regulators is fully protected fr om damage due to fault conditions. current limiting is provided. this limiting is linear; output current under overload conditions is constant. thermal shutdown disables the device when the die temperature exceeds the 125 maximum safe operating temperature. transient protection allows device survival even w hen the input voltage spikes between -20v and +30v. when the input voltage exceeds about 28v, the over voltage sensor temporarily disables the regulator. vin out gnd v out v in c out + c in + figure 1. linear regulators require only two capacitors for operation. thermal design linear regulators are simple to use. the most complicated design parameters to consider are thermal characteristics. thermal desi gn requires the following application-specific parameters: - maximum ambient temperature, t a - output current, i out - output voltage, v out - input voltage, v in first, we calculate the power dissipation of the re gulator from these numbers and the device parameters from this datasheet. p d =i out (1.01v in -v out ) where the ground current is approximated by 1% of i out . then the heat sink thermal resistance is determined with this formula: () cs jc d a jmax sa + - p t - t = where t jmax 125 and cs is between 0 and 2 /w.
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 10 - htc capacitor requirements for stability and minimum output noise, a capacitor on t he regulator output is neces sary. the value of this capacitor is dependent upon the output current; lower currents allow smaller capacitors. lm27150 regulators are stable with the 10uf minimum capacitor va lues at full load. where the regulator is powered from a source with a high ac impedance, a 0.1uf capacitor connected between input and gnd is recommended. this capacitor should ha ve good characteristics to above 250khz. minimum load current the lm27150 regulators are specified between finite load s. if the output is too small, leakage currents is too small, leakage currents dominate and the output voltage rises. the 5ma minimum load current swamps any expected leakage current across t he operating temperature range. adjustable regulator design the adjustable regulator versions, lm27152 allows programming the output voltage anywhere between 1.25v and the 25v maximum operating rating of the family. two resistors are used. resistors can be quite large, up to 1m ? , because of the very high input impedance and low bias current of the sense comparator: the resistor values are calculated by: ) 1 \ v v ( 2 =r 1 r ref out where v out is desired output voltage, figure 2 shows comp onent definition. applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation. vin out en adj gnd c out + r1 r2 c in + v in v out v out = 1.240 x [1 + (r1/r2)] figure 2. adjustable regulator with resistors error flag lm27151 versions feature and error flag, which looks at the output voltage and signals and error condition when this voltage and signals an error condition when this voltage drops 5% below its expected value. the error flag is an open-collector output that pulls low under fault conditions. it may sink 10ma. low output voltage signifies a number of possible problems, includi ng an over-current fault (the device is in current limit) and low input voltage. the flag output is inoperati ve during over temperature shutdown conditions.
1.5a very l.d.o voltage regulator lm27150/27151/27152 dec. 2011 ? rev.1.3.1 - 11 - htc enable input lm27151 and lm27152 versions feature and enable (en) in put that allows on/off control of the device. special design allows "zero" current drain when the device is disabled-only microamperes of leakage current flows. the en input has ttl/cmos compatible th resholds for simple interfacing with logic, or may be directly tied to 30v. enabling the regulator requires approximately 20ua of current.
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