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1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 1 - htc sot-223 pkg to-252 3l / 5l pkg sop-8 pkg ordering information device package lm39100s-x.x lm39100gs-x.x sot-223 lm39100rs-x.x lm39100grs-x.x to-252 3l lm39101rs-x.x lm39101grs-x.x lm39102rs lm39102grs to-252 5l lm39101d-x.x lm39102d sop-8 features z fixed and adjustable output voltages to 1.24v z 410mv typical dropout at 1a ideal for 3.0v to 2.5v conversion ideal for 2.5v to 1.8v or 1.5v conversion z 1a minimum guaranteed output current z 1% initial accuracy z low ground current z current limiting and thermal shutdown z reversed-battery protection z reversed-leakage protection z fast transient response z low-profile sot-223 package z moisture sensitivity level 3 application z battery powered equipments z motherboards and graphic cards z microprocessor power supplies z peripheral cards z high efficiency linear regulators z battery chargers descripsion the lm39100/1/2 is 1a low-dropout linear voltage regulators that provide low- voltage, high-current output. x.x = output voltage = 1.5, 1.8, 2.5, 3.3, 5.0 the lm39100/1/2 offers extremely low dropout (typically 410mv at 1a) and low ground current (typically 12ma at 1a). the lm39100 is a fixed output regulator offered in the sot-223 package. the lm39101 and lm39102 are fixed and adjustable regulators, respectively, in sop-8 and to-252 packages. the lm39100/1/2 is ideal for pc add-in cards that need to convert from standard 5v to 3.3v, 3.3v to 2.5v or 2.5v to1.8v. a guaranteed maximum dropout voltage of 630mv overall operating conditions allows the lm39100/1/2 to provide2.5v from a supply as low as 3. 13v and 1.8v from a supply as low as 2.43v. the lm39100/1/2 is fully protected with over current limiti ng, thermal shutdown, and reversed-battery protection. fixed voltages of 5.0v, 3.3v, 2.5v, 1.8v and 1.5v are available on lm391 00/1 with adjustable output voltages to 1.24v on lm39102. absolute maximum ratings (note 1) characteristic symbol min. max. unit supply voltage v in - 0.3 + 20 v enable voltage v en - + 20 v output voltage v out -0.3 v in +0.3 v lead temperature (soldering, 5 sec) t sol - 260 storage temperature range t stg -65 + 150
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 2 - htc operating ratings (note 2) characteristic symbol min. max. unit supply voltage v in + 2.25 + 16 v enable voltage v en + 2.25 + 16 v maximum power dissipation pd (max) (note 3) (note 3) junction temperature t j -40 + 125 ja-sot-223 115 /w ja-to252 95 /w package thermal resistance ja-sop-8 130 /w ordering information v out package order no. description supplied as status sot-223 lm39100s-1.5v 1a, fixed reel active sot-223 lm39100gs-1.5v 1a, fixed reel contact us to-252 3l lm39100rs-1.5v 1a, fixed reel active to-252 3l lm39100grs-1.5v 1a, fixed reel active to-252 5l lm39101rs-1.5v 1a, fixed, enable reel active to-252 5l lm39101grs-1.5v 1a, fixed, enable reel active 1.5 v sop-8 lm39101d-1.5v 1a, fixed, enable reel active sot-223 lm39100s-1.8v 1a, fixed reel active sot-223 lm39100gs-1.8v 1a, fixed reel contact us to-252 3l lm39100rs-1.8v 1a, fixed reel active to-252 3l lm39100grs-1.8v 1a, fixed reel active to-252 5l lm39101rs-1.8v 1a, fixed, enable reel active to-252 5l lm39101grs-1.8v 1a, fixed, enable reel active 1.8 v sop-8 lm39101d-1.8v 1a, fixed, enable reel active sot-223 lm39100s-2.5v 1a, fixed reel active sot-223 lm39100gs-2.5v 1a, fixed reel contact us to-252 3l lm39100rs-2.5v 1a, fixed reel active to-252 3l lm39100grs-2.5v 1a, fixed reel active to-252 5l lm39101rs-2.5v 1a, fixed, enable reel active to-252 5l lm39101grs-2.5v 1a, fixed, enable reel active 2.5 v sop-8 lm39101d-2.5v 1a, fixed, enable reel active sot-223 lm39100s-3.3v 1a, fixed reel active sot-223 lm39100gs-3.3v 1a, fixed reel contact us to-252 3l lm39100rs-3.3v 1a, fixed reel active to-252 3l lm39100grs-3.3v 1a, fixed reel active to-252 5l lm39101rs-3.3v 1a, fixed, enable reel active to-252 5l lm39101grs-3.3v 1a, fixed, enable reel active 3.3 v sop-8 lm39101d-3.3v 1a, fixed, enable reel active
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 3 - htc ordering information v out package order no. description supplied as status sot-223 lm39100s-5.0v 1a, fixed reel active sot-223 lm39100gs-5.0v 1a, fixed reel contact us to-252 3l lm39100rs-5.0v 1a, fixed reel active to-252 3l lm39100grs-5.0v 1a, fixed reel active to-252 5l lm39101rs-5.0v 1a, fixed, enable reel active to-252 5l lm39101grs-5.0v 1a, fixed, enable reel active 5.0 v sop-8 lm39101d-5.0v 1a, fixed, enable reel active to-252 5l lm39102rs 1a, adjustable, enable reel active to-252 5l lm39102grs 1a, adjustable, enable reel active adj sop-8 lm39102d 1a, adjustable, enable reel active package type root name product code lm 3910x output voltage : 1.5v / 1.8v / 2.5v / 3.3v / 5.0v / blank(adj only) s rs d green mode g : halogen free blank : pb free : sot-223 : to-252 : sop-8 39100 : 3l fixed output 39101 : 5l fixed output 39102 : 5l / 8l adjustable output
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 4 - htc pin configuration sop-8 sot-223 to-252 3l to-252 5l pin description sot-223 & to-252 3l (for 39100) pin no. name function 1 vin input supply 2 gnd ground 3 vout output voltage to-252 5l (for 39101/2) sop-8 (for 39101/2) pin no. name function name function 1 en chip enable en chip enable 2 vin input supply vin input supply 3 gnd ground vout output voltage 4 vout output voltage flg / adj error flag output or output adjust 5 flg / adj error flag output or output adjust gnd ground 6 / 7 / 8 - - gnd ground vout gnd (tab) vin 3 2 1 3 2 1 vout gnd (tab) vin flg/adj vout gnd (tab) vin en en 1 vin 2 vout 3 flg/adj 4 8 gnd 7 gnd 6 gnd 5 gnd 5 4 3 2 1
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 5 - htc typical application in out gnd 2.5v 3.3v lm39100 in out en flg gnd 100k lm39101 2.5v error flag output 3.3v enable shutdown 2.5v / 1a regulator 2.5v / 1a regulator with error flag in out en adj gnd lm39102 1.5v 2.5v enable shutdown r1 r2 1.5v / 1a adjustable regulator
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 6 - htc electrical characteristics v in = v out +1v; v en = 2.25v; t j = 25 c, bold values indicate -40 c t j +125 c; unless noted symbol parameters condition min. typ. max. unit v out output voltage 10ma 10ma i out 1a, v out +1v v in 8v -1 -2 1 2 % % line regulation i out =10ma, v out +1v v in 16v 0.06 0.5 % load regulation v in = v out +1v, 10ma i out 1a 0.2 1 % v out / t output voltage temp. coefficient (note 4) 40 100 ppm/ c i out =100ma, v out = -1% 150 200 250 mv mv i out =500ma, v out = -1% 275 mv i out =750ma, v out = -1% 330 500 mv v do dropout voltage (note 5) i out =1a, v out = -1% 410 550 630 mv mv i out =100ma, v in = v out +1v 700 a i out =500ma, v in = v out +1v 4 ma i gnd ground current (note 6) i out =750ma, v in = v out +1v 7 ma i out(lim) current limit v out =0v, v in =v out +1v 1.8 2.5 a enable input logic low (off) 0.8 v v en enable input voltage logic high (on) 2.25 v v en =2.25v 1 15 30 75 a a i en enable input current v en =0.8v 2 4 a a i out =10ma, v in =v out +1v, v en =0v to v in 50 500 i out =500ma, v in =v out +1v, v en =0v to v in 250 2000 t en delay time to nominal output voltage (note 7) i out =1.0a, v in =v out +1v, v en =0v to v in 350 3000 s flag output i flg (leak) output leakage current v oh =16v 0.01 1 2 a a v flg (do) output low voltage (note 8) v in =0.9.v out nominal, i ol =250 a 240 300 400 mv mv low threshold % of v out 93 % high threshold % of v out 99.2 % v flg hysteresis 1 %
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 7 - htc lm39102 only reference voltage 1.228 1.215 1.24 1.252 1.265 v v (note 9) 1.203 1.277 v adjust pin bias current 40 80 120 na na reference voltage temp. coefficient (note 4) 20 ppm/ c adjust pin bias current temp. coefficient 0.1 99.2 na/ c note 1. exceeding the absolute maxi mum ratings may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3. pd (max)= (t j (max) - t a ) ja , where ja -junction-to-ambient thermal resistance. note 4. output voltage temperature coefficient is v out (worst case) (t j(max) - t j(min) ) where t j(max) is +125c and t j(min) is 0c. note 5. v do = v in - v out when v out decreases to 99% of its nominal output voltage with v in = v out + 1v. for output voltages below 2.25v, dropout voltage is the input-to-output voltage differential with the minimum input voltage being 2.25v. minimum input operating voltage is 2.25v. note 6. i gnd is the quiescent current. i in = i gnd + i out. note 7. delay time is measured after v en =v in . c in =c out =10 f. note 8. for adjustable device and fixed device with v out 2.5v note 9. v ref v out (v in - 1v), 2.25v v in 16v, 10ma i l 1 a.
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 8 - htc typical operating characteristics
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 9 - htc typical operating characteristics
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 10 - htc application information the lm39100/1/2 is a high-performance low-dropout voltage regulator suitable for moderate to high-current voltage regulator applications. its 630mv dropout voltage at full load and over temperature makes it especially valuable in battery-powered systems and as high-efficiency noise filters in post-regulator applications. unlike older npn-pass transistor de-signs, where the mini mum dropout voltage is limited by the base-to-emitter voltage drop and collector-to-emitter saturation voltage, dropout performance of the pnp output of these devices is limited only by the low vce saturation voltage. a trade-off for the low dropout voltage is a varying base drive requirement. the lm39100/1/2 regulator is fully protected from da mage due to fault conditions. linear current limiting is provided. output current during overl oad conditions is constant. thermal shutdown disables the device when the die temperature exceeds the maximum safe operating temperature. transient protection allows device (and load) survival even when the input voltage spikes above and below nominal. the output structure of these regulators allows voltages in excess of the des ired output voltage to be applied without reverse current flow. output capacitor the lm39100/1/2 requires an output capacitor to maintain stability and improve transient response. proper capacitor selection is important to ensure proper o peration. the lm39100/1/2 output capacitor selection is dependent upon the esr (equivalent series resistance) of the output capacitor to maintain stability. when the output capacitor is 10 f or greater, the output capacitor should have an esr less than 2 ? . this will improve transient response as well as promote stability. ultra-low-esr capacitors, such as ceramic chip capacitors, may promote instability or may cause an oscillation and/or under damped transient response. in this case, minimum 20uf of output capacitance is r equired. a low-esr solid tantalum capacitor works extremely well and provides good transient response and st ability over temperature. aluminum electrolytic capacitor can also be used, as long as the esr of the capacitor is <2 ? . the value of the output capacitor can be increased without limit. higher capacitance values hel p to improve transient response and ripple rejection and reduce output noise. input capacitor an input capacitor of 1 f or greater is recommended when the device is more than 4 inches away from the bulk ac supply capacitance or when the supply is a battery. in the case of ceramic chip capacitor, 10uf capacitance is recommended. larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving t he integrity of the output voltage. error flag the lm39101 features an error flag (flg), which moni tors the output 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 and may sink up to 10ma. low output voltage signifies a number of possible problems, including an over current fault (the device is in current limit) or low input voltage. the flag output is inoperative during over temperature conditions. a pu ll-up resistor from flg to either v in or v out is required for proper operation. for information regarding the minimum and maximum values of pull-up resistance, refer to the graph in the typical characteri stics section of the data sheet.
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 11 - htc enable input the lm39101 and lm39102 versions feature an active-high enable input (en) that allows on-off control of the regulator. current drain reduces to ?zero? when the devi ce is shutdown, with only micro amperes of leakage current. the en input has ttl/cmos compatible thresholds for simple logic interfacing. en may be directly tied to v in and pulled up to the maximum supply voltage transient response and 3.3v to 2.5v or 2.5v to 1.8v conversion the lm39100/1/2 has excellent transient response to va riations in input voltage and load current. the device has been designed to respond quickly to load current variations and input voltage variations. large output capacitors are not required to obtain this performance. a standard 10f output capacitor, preferably tantalum, is all that is required. larger values he lp to improve performance even further. by virtue of its low-dropout voltage, this device does no t saturate into dropout as readily as similar npn- based de-signs. when converting from 3. 3v to 2.5v or 2.5v to 1.8v, the npn based regulators are already operating in dropout, with typical drop out requirements of 1.2v or greater. to convert down to 2.5v or 1.8v without operating in dropout, npn-based regulators requi re an input voltage of 3.7v at the very least. the lm39100 regulator will provide excellent performance with an input as low as 3.0v or 2.5v respectively. this gives the pnp based regulators a distinct advant age over older, npn based linear regulators. minimum load current the lm39100/1/2 regulator is specified between finite loads. if the output current is too small, leakage currents dominate and the output voltage rises. a 10m a minimum load current is necessary for proper regulation. adjustable regulator design the lm39102 allows programming the output vo ltage any-where between 1.24v and the 16v maximum operating rating of the family. two resistors ar e used. resistors can be quite large, up to 1m ? , because of the very high input impedance and low bias current of the se nse comparator: the resistor values are calculated by : r1=r2(vout/1.240-1) where vout is the desired output voltage. figu re 1 shows component definition. applications with widely varying load currents may scal e the resistors to draw the minimum load current required for proper operation (see below). the cu rrent consumed by feedback resisters r1 and r2 is calculated by: ires = vout / (r1+ r2). in out en adj gnd c out lm39102 vout vin enable shutdown r1 r2 figure 1. adjustable regulator with resistors maximum output current capability the lm39100/1/2 can deliver a contin uous current of 1a over the full operating junction temperature range. however, the output current is limited by the restriction of pow er dissipation which differs from packages. a
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 12 - htc heat sink may be required depending on the maximum pow er dissipation and maximum ambient temperature of application. with respect to the applied package, the maximum output current of 1a may be still undeliverable due to the restriction of the power dissipation of lm39100/1/2. under all possible conditions, the junction temperature must be within the range specified under operating conditions. the temperatures over the device are given by: t c = t a + p d x ca / t j = t c + p d x jc / t j = t a + p d x ja where t j is the junction temperature, t c is the case temperature, t a is the ambient temperature, p d is the total power dissipation of the device, ca is the thermal resistance of case-to-ambient, jc is the thermal resistance of junction-to-case, and ja is the thermal resistance of junction to ambient. the total power dissipation of the device is given by: p d = p in ? p out = (v in x i in )?(v out x i out ) = (v in x (i out +i gnd )) ? (v out x i out ) = (v in - v out ) x i out + v in x i gnd where i gnd is the operating ground current of the device which is specified at the electrical characteristics. the maximum allowable temperature rise (t rmax ) depends on the maximum ambient temperature (t amax ) of the application, and the maximum allowable junction temperature (t jmax ): t rmax = t jmax ? t amax the maximum allowable value for junction-to-ambient thermal resistance, ja , can be calculated using the formula: ja = t rmax / p d = (t jmax ? t amax ) / p d lm39100/1/2 is available in sot-223, to-252, and sop-8 package. the thermal resistance depends on amount of copper area or heat sink, and on air flow. if the maximum allowable value of ja calculated above is over 115c/w for sot-223 package, 95c/w for to-252 package, 130c/w for sop-8 package, no heat sink is needed since the package can dissipate enough heat to satisfy these requirements. if the value for allowable ja falls near or below these limits, a heat sink or proper area of copper plane is required. in summary, the absolute maximum ratings of thermal resistances are as follow: absolute maximum ratings of thermal resistance characteristic symbol rating unit thermal resistance junction-to-ambient / sot-223 ja-sot-223 115 c/w thermal resistance junction-to-ambient / to-252 ja-to-252 95 c/w thermal resistance junction-to-ambient / sop-8 ja-sop-8 130 c/w no heat sink / no air flow / no adjacent heat source / 20 mm 2 copper area. (t a =25c)
1a low-voltage low-dropout regul ator lm39100/39101/39102 nov. 2010 - rev. 1.5.1 - 13 - htc power disspation(pd) vs. copper area (sop-8) 0.4 0.6 0.8 1 1.2 1.4 1.6 10 100 1000 copper area (mm 2 ) power disspation, pd (w) @ t j =125 thermal resistance( ja) vs. copper area (sop-8) 40 60 80 100 120 140 10 100 1000 copper area (mm 2 ) thermal resistance, ja( /w)

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