ts2940 1a ultra low dropout vo ltage regulator 1 / 10 version: c 07 to - 220 to - 263 (d 2 pak) to - 252 (dpak) sot - 223 general description t he ts2940 series of fixed - voltage monolithic micro - power voltage regulators is designed for a wide range o f applications. th i s device excellent choice of use in battery - power application. furthermore, the quiescent current increases on slightly at dropout, which prolongs battery life. this series of fixed - voltage regulators features low drop output voltage (t yp. 60mv a t light load and 6 00mv at 800m a). this includes a tight initial tolerance of 2 %, extremely good line regulation of 0.05% typ., and very low output temperature coefficient. features dropout voltage typically 0.6v @ io=800ma output current up to 1a output voltage trimmed before assembly - 18v reverse peak voltage +30v input over voltage protection +60v transient peak voltage internal current limit thermal shutdown protection block diagram ordering info rmation note: where xx denotes voltage option, available are 50 = 5 .0 v 33 = 3. 3 v contact factory for additional voltage options. part no. package packing ts2940 cz xx c0 to - 220 50pcs / tube ts2940 cm xx rn to - 263 800pcs / 13 reel ts2940 cp xx ro to - 252 2.5kpcs / 13 reel ts2940 cw xx rp sot - 223 2.5kpcs / 13 reel absolute maximum rating (note 1) parameter symbol limit unit input supply voltage (note 2) v in - 18 ~ +60 v input supply volt age v opr 26 v power dissipation (note 3) p d internally limited w operating junction temperature range t j - 40 ~ +125 o c storage temperature range t stg - 65 ~ +150 o c pin definition : 1. input 2. ground 3. output
ts2940 1a ultra low dropout vo ltage regulator 2 / 10 version: c 07 electrical characteristics ( v in = v out +1v , i l = 5 ma, c o = 22u f, t a =25 o c , unless otherwise no ted) parameter conditions min typ max u nit input supply voltage -- -- 26 v output voltage 5 ma i l 800m a, vo+5v v in 26v 0.9 7 0|vo| 5.0 / 3.3 1.0 3 0|vo| v output voltage temperature coefficient -- 50 150 ppm/ o c line regulation vo+2v v in 26 v -- 0. 05 0. 5 % load regulation 5 ma i l 800m a -- 0. 2 1.0 % dropout voltage (note 4 ) i l =100 m a i l = 5 00ma i l = 800m a -- -- -- 1 00 3 00 600 2 00 5 00 800 mv quiescent current (note 5 ) i l = 5m a i l = 800m a -- -- 10 75 15 110 ma short circuit current (note 6) v ou t =0 -- -- 1.5 a output noise, 10hz to 100khz, i l = 10 ma c l =2.2 u f c l =3.3 u f c l =33 u f -- -- -- 500 350 120 -- -- -- u vrms thermal performance condition package type typ u nit to - 220 60 to - 263 80 to - 252 150 thermal resistance junction to ambient sot - 223 170 o c/w note 1: absolute maximum rating is limits beyond which damage to the device may occur. for guaranteed specifications and test conditions see the electrical characteristics. note 2: maximum positive supply voltage of 60v must be limited durati on (<100ms) and duty cycle (<1%). note 3: the maximum allowable power dissipation is a function of the maximum junction temperature, tj, the junction to ambient thermal resistance, ja, and the ambient temperature, ta. exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. the effective value of ja can be reduced by using a heatsink. note 3: dropout vo ltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential. note 4: ground pin current is the regulator quiescent current. the total current drawn from the source is the s um of the ground pin current and output load current. note 5: output current will decrease with increasing temperature, but it will be not dropped below 1a at the maximum specified temperature.
ts2940 1a ultra low dropout vo ltage regulator 3 / 10 version: c 07 application information the ts2940 series is a high performa nce with low dropout voltage regulator suitable for moderate to high current and voltage regulator application. its 600ma(typ) dropout voltage at full load and over temperature makes it especially valuable in battery power systems and as high efficiency no ise filters in post regulator applications. unlike normal npn transistor design, where the base to emitter voltage drop and collector to emitter saturation voltage limit the minimum dropout voltage, dropout performance of the pnp output of these devices is limited only by low vce saturation voltage. the ts2940 series is fully protected from damage due to fault conditions. linear current limiting is provided. output current during overload conditions is constant. thermal shutdown the device when the die temp erature exceeds the maximum safe operating temperature. transient protection allows device survival even when the input voltage spikes above and below nominal. the output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. typical application circuit output capacitor the ts2940 series requires an output capacitor to maintain stability and improve transient response. proper capacitor selection is important to ensure proper operat ion. the output capacitor selection is dependent upon the esr of the output capacitor the maintain stability. when the output capacitor is 22uf or greater, the output capacitor should have an esr less than 2 ohm. this will improve transient response as wel l as promoted stability. ultra low esr capacitors (<100mohm), such as ceramic chip capacitors may promote instability. these very low esr levels may cause an oscillation and/or under damped transient response. a low esr solid tantalum capacitor works extre mely well and provides good transient response and stability over temperature. aluminum electrolytic can also be used, as long as the esr of the capacitor is <2ohm. the value of the output capacitor can be increased without limit. higher capacitance values help to improved transient response and ripple rejection and reduce output noise. minimum load current the ts2940 series is specified between finite loads. if the output current is too small leakage currents dominate and the output voltage rises. a 1 0 ma minimum load current is necessary for proper regulation. input capacitor an input capacitor of 1uf or greater is recommended when the device is more that 4 inches away from the bulk ac supply capacitance or when the supply is a battery. small and surface m ount ceramic chip capacitors can be used for bypassing. larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage.
ts2940 1a ultra low dropout vo ltage regulator 4 / 10 version: c 07 application information (continue) thermal charac teristics a heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. under all possible operating conditions, the junction temperature must be within the range specified under absolute maximum ratings. to determine if the heatsink is required, the power dissipated by the regulator, p d must be calculated. the below formula shows the voltages and currents for calculating the p d in the regulator: iin = il / ig p d = (v in - v out ) * i l + (v in ) * i g ex . p d = (3.3v - 2.5v) * 1a + 3.3v * 11ma = 800mw + 36mw = 836mw remark: i l is output load current, i g is ground current. v in is input voltage v out is output voltage the next parameter which must be calculated is the maximum allowable tem perature rise. tr(max) is calculated by the using to formula: tr(max) = tj(max) ta(max) where: tj(max) is the maximum allowable junction temperature, which is 125 o c for commercial grade part s . t a (max) is the maximum ambient temperature which will be enco untered in the application. using the calculated values for tr(max) and pd, the maximum allowable value for the junction to ambient thermal resistance, ja, can now be found: ja = tr(max) / pd important: if the maximum allowable value for is found to be 60 o c /w for the to - 220 package, 80 o c /w for the to - 263 package, 150 o c /w for the to - 252 package, or 170 o c /w for the sot - 223 package, no heatsink is needed since the package alone will dissipate enough heat to satisfy these requirements. if the calculated value for ja falls below these limits, a heatsink is required.
ts2940 1a ultra low dropout vo ltage regulator 5 / 10 version: c 07 application information (continue) f igure 1 d 2 pak thermal re sistance and maximum power dissipation vs. p.c.b copper length f igure 2 dpak thermal resistance and maximum power dissipation vs. p.c.b copper length f igure 3 sot - 223 thermal resistance and maximum power dissipation vs. p.c.b copper length
ts2940 1a ultra low dropout vo ltage regulator 6 / 10 version: c 07 to - 220 mechanical drawing marking diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code (3.3=3.3v, 5.0=5v) to - 220 dimension millimeters inches dim min max min max a 10.000 10.500 0.394 0.413 b 3.740 3.910 0.147 0.154 c 2.440 2.940 0.096 0.116 d - 6.350 - 0.250 e 0.381 1.106 0.015 0.040 f 2.345 2.715 0.092 0.058 g 4.690 5. 430 0.092 0.107 h 12.700 14.732 0.500 0.581 i 8.382 9.017 0.330 0.355 j 14.224 16.510 0.560 0.650 k 3.556 4.826 0.140 0.190 l 0.508 1.397 0.020 0.055 m 27.700 29.620 1.060 1.230 n 2.032 2.921 0.080 0.115 o 0.255 0.610 0.010 0.024 p 5.842 6.858 0.2 30 0.270
ts2940 1a ultra low dropout vo ltage regulator 7 / 10 version: c 07 to - 263 mechanical draw ing marking diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code (3.3=3.3v, 5.0=5v) to - 2 63 dim ension millimeters inches dim min max mi n max a 10.000 10.500 0.394 0.413 b 14.605 15.875 0.575 0.625 c 0.508 0.991 0.020 0.039 d 2.420 2.660 0.095 0.105 e 4.064 4.830 0.160 0.190 f 1.118 1.400 0.045 0.055 g 0.450 0.730 0.018 0.029 h 8.280 8.800 0.325 0.346 i 1.140 1.400 0.044 0.055 j 1.480 1.520 0.058 0.060
ts2940 1a ultra low dropout vo ltage regulator 8 / 10 version: c 07 to - 252 mechanical drawing marking diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code (3.3=3.3v, 5.0=5v) to - 2 52 di mension millimeters inches dim min max min max a 2.3bsc 0.09bsc a1 4.6bsc 0.18bsc b 6.80 7.20 0.268 0.283 c 5.4 0 5.60 0.213 0.220 d 6.40 6.65 0.252 0.262 e 2.20 2.40 0.087 0.094 f 0.00 0.20 0.000 0.008 g 5.20 5.40 0.205 0.213 g1 0.75 0.85 0.030 0.033 g2 0.55 0.65 0.022 0.026 h 0.35 0.65 0.014 0.026 i 0.90 1.50 0.035 0.059 j 2.20 2.80 0.087 0.110 k 0.50 1. 10 0.020 0.043 l 0.90 1.50 0.035 0.059 m 1.30 1.70 0.051 0.67
ts2940 1a ultra low dropout vo ltage regulator 9 / 10 version: c 07 sot - 223 mechanical drawing marki ng diagram y = year code m = month code ( a =jan, b =feb, c =mar, d =apl, e =may, f =jun, g =jul, h =aug, i =sep, j =oct, k =nov, l =dec) l = lot code xx = voltage code (3.3=3.3v, 5.0=5v) sot - 223 dim ension millimeters inches dim min max min max a 6.350 6.850 0.250 0.270 b 2.900 3.100 0.114 0.122 c 3.450 3.750 0.136 0.148 d 0.595 0.635 0.023 0.025 e 4.550 4.650 0.179 0.183 f 2.250 2.350 0.088 0.093 g 0.835 1.035 0.032 0.041 h 6.700 7.300 0.263 0.287 i 0.250 0.355 0.010 0.014 j 10 16 10 16 k 1.550 1.800 0.061 0.071
ts2940 1a ultra low dropout vo ltage regulator 10 / 10 version: c 07 notice specifica tions of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. information contained herein is intended to provide a product description only . no license, express or implied, to any intellectual property rights is granted by this document. except as provided in tsc s terms and conditions of sale for such products, tsc assumes no liability whatsoever, and disclaims any express or implied warrant y, relating to sale and/or use of tsc products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. the products shown herein are n ot designed for use in medical, life - saving, or life - sustaining applications. customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify tsc for any damages resulting from such improper use o r sale.
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