ts2937 500ma ultra low dropout voltage regulator 1/10 version: d13 to - 220 to - 263 (d 2 pak) to - 252 (dpak) sot - 223 general description ts2937 of fixed-voltage monolithic micro-power volt age regulators is designed for a wide range of app lications. this device excellent choice of use in battery-powe r application. furthermore, the quiescent current i ncreases on slightly at dropout, which prolongs battery life. t his series of fixed-voltage regulators features ver y low ground current (200ua typ.) and very low drop output volta ge (typ. 60mv at light load and 600mv at 500ma). th is includes a tight initial tolerance of 2%, extremely good line regulation of 0.05% typ., and very low o utput temperature coefficient. features dropout voltage typically 0.6v @ io=500ma output voltage trimmed before assembly -18v reverse peak voltage +30v input over voltage protection +60v transient peak voltage internal current limit thermal shutdown protection ordering information note: where xx denotes voltage option, available ar e 12 = 12v 50 = 5v 33 = 3.3v contact factory for additional voltage options. part no. package packing ts2937cz xx c0 to-220 50pcs / tube ts2937cm xx rn to-263 800pcs / 13 reel ts2937cp xx ro to-252 2.5kpcs / 13 reel ts2937cw xx rp sot-223 2.5kpcs / 13 reel block diagram absolute maximum rating parameter symbol limit unit input supply voltage v in -18 ~ +60 v operation input supply voltage v opr 26 v power dissipation 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
ts2937 500ma ultra low dropout voltage regulator 2/10 version: d13 electrical characteristics ( v in =v out +1v, i l =5ma, c o =10uf, t a =25 o c , unless otherwise noted) parameter conditions min typ max unit output voltage 0.980|vo| 12 / 10 5.0 / 3.3 1.020|vo| v output voltage 5ma i l 500ma, vo+1v v in 26v 0.970|vo| 1.030|vo| v input supply voltage -- -- 26 v output voltage temperature coefficient -- 50 150 p pm/ o c line regulation vo+1v v in 26v -- 0.05 0.5 % load regulation 5ma i l 500ma -- 0.2 1.0 % dropout voltage (note 4) i l =100ma i l =300ma i l =500ma -- -- -- 100 400 600 300 500 700 mv quiescent current (note 5) i l =100ua i l =300ma i l =500ma -- -- -- 200 12 25 -- -- -- ua ma ma short circuit current (note 6) v out =0 -- -- 1.3 a output noise, 10hz to 100khz, i l =10ma c l =2.2uf c l =3.3uf c l =33uf -- -- -- 500 350 120 -- -- -- uvrms thermal performance condition package type typ unit thermal resistance junction to ambient to-220 60 o c/w to-263 80 to-252 150 sot-223 170 note 1: absolute maximum rating is limits beyond wh ich damage to the device may occur. for guaranteed specifications and test conditions see the electric al characteristics. note 2: maximum positive supply voltage of 60v must be limited duration (<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 di e temperature, and the regulator will go into therm al shutdown. the effective value of ja can be reduced by using a heatsink. note 3: dropout voltage is defined as the input to output differential at which the output voltage dro ps 2% below its nominal value measured at 1v differential. note 4: ground pin current is the regulator quiesce nt current. the total current drawn from the source is the sum of the ground pin current and output load current. note 5: output current will decrease with increasin g temperature, but it will be not dropped below 500 ma at the maximum specified temperature.
ts2937 500ma ultra low dropout voltage regulator 3/10 version: d13 application information the ts2937 series is a high performance with low dr opout voltage regulator suitable for moderate to hi gh current and voltage regulator application. its 600mv(typ) d ropout voltage at full load and over temperature ma kes it especially valuable in battery power systems and as high efficiency noise filters in post regulator ap plications. unlike normal npn transistor design, where the base to emitter voltage drop and collector to emitter s aturation voltage limit the minimum dropout voltage, dropout performance of the pnp output of these devices is l imited only by low vce saturation voltage. the ts2937 series is fully protected from damage du e to fault conditions. linear current limiting is p rovided. output current during overload conditions is constant. the rmal shutdown the device when the die temperature e xceeds the maximum safe operating temperature. transient p rotection allows device survival even when the inpu t voltage spikes above and below nominal. the output structur e of these regulators allows voltages in excess of the desired output voltage to be applied without reverse curren t flow. typical application circuit output capacitor the ts2937 series requires an output capacitor to m aintain stability and improve transient response. p roper capacitor selection is important to ensure proper o peration. the output capacitor selection is depende nt upon the esr of the output capacitor the maintain stability. when the output capacitor is 10uf or greater, the output capacitor should have an esr less than 2 ohm. this will improve transient response as well as promoted stability. ultra low esr capacitors (<100mohm), such as cerami c chip capacitors may promote instability. these ve ry low esr levels may cause an oscillation and/or under da mped transient response. a low esr solid tantalum c apacitor works extremely well and provides good transient re sponse and stability over temperature. aluminum ele ctrolytic can also be used, as long as the esr of the capacit or is <2ohm. the value of the output capacitor can be increased without limit. higher capacitance values help to improved transient response and ripple reje ction and reduce output noise. minimum load current the ts2937 series is specified between finite loads . if the output current is too small leakage curren ts dominate and the output voltage rises. a 1ma minimum load cu rrent 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 th e bulk ac supply capacitance or when the supply is a battery. small and surface mount ceramic chip capacitors ca n be used for bypassing. larger values will help to improve r ipple rejection by bypassing the input to the regul ator, further improving the integrity of the output voltage.
ts2937 500ma ultra low dropout voltage regulator 4/10 version: d13 application information (continue) thermal characteristics a heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. under all possible operating condi tions, 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 f or 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) * 0.5a + 3.3v * 11ma = 400mw + 36mw = 436mw 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 temperature rise. tr(max) is calculated by the using to formula: tr(max) = tj(max) C ta(max) where: tj(max) is the maximum allowable junction te mperature, which is 125 o c for commercial grade parts. t a (max) is the maximum ambient temperature which will be encountered in the application. using the calculated values for tr(max) and pd, the maximum allowable value for the junction to ambien t thermal resistance, ja, can now be found: ja = tr(max) / pd important: if the maximum allowable value for is fo und to be 6 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 enoug h heat to satisfy these requirements. if the calcul ated value for ja falls below these limits, a heatsink is required .
ts2937 500ma ultra low dropout voltage regulator 5/10 version: d13 application information (continue) figure 1 C d 2 pak thermal resistance and maximum power dissipation vs. p.c.b copper length figure 2 C dpak thermal resistance and maximum powe r dissipation vs. p.c.b copper length figure 3 C sot-223 thermal resistance and maximum p ower dissipation vs. p.c.b copper length
ts2937 500ma ultra low dropout voltage regulator 6/10 version: d13 to-220 mechanical drawing unit: millimeters 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, 12=12v)
ts2937 500ma ultra low dropout voltage regulator 7/10 version: d13 to-263 mechanical drawing unit: millimeters 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, 12=12v)
ts2937 500ma ultra low dropout voltage regulator 8/10 version: d13 to-252 mechanical drawing unit: millimeters 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, 12=12v)
ts2937 500ma ultra low dropout voltage regulator 9/10 version: d13 sot-223 mechanical drawing unit: millimeters 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, 12=12v)
ts2937 500ma ultra low dropout voltage regulator 10/10 version: d13 notice specifications of the products displayed herein are subject to change without notice. tsc or anyone on its behalf, assumes no responsibility or liability for any erro rs 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 tscs terms and co nditions of sale for such products, tsc assumes no liability wh atsoever, and disclaims any express or implied warr anty, relating to sale and/or use of tsc products includi ng liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, cop yright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applica tions. customers using or selling these products for use i n such applications do so at their own risk and agr ee to fully indemnify tsc for any damages resulting from such i mproper use or sale.
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