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technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a description: the sulr1722a is a 3-pin low dropout linear regulator. the superior characteristics of the sulr1722a include zero base current loss, very low dropout voltage, and 2% accuracy output voltage. typical ground current remains approximately 55 a, from no load to maximum loading conditions. dropout voltage at 300ma output current is exceptionally low. output current limiting and thermal limiting are built in to provide maximal protection to the sulr1722a against fault conditions. the sulr1722a comes in the popular 3-pin sot-23 package. features: ? low dropout voltage of 470mv at 300ma output current (3.0v output version). ? guaranteed 300ma output current. ? maximum input voltage is 8v ? low ground current at 55 a. ? 2% accuracy output voltage of 1.5v/1.8v/2.0v /2.5 v /2.7v/ 3.0v/ 3.3v/ 3.5v/ 3.7v/ 3.8v/5.0v/ 5.2v. ? needs only 1 f for stability. ? current and thermal limiting. applications: ? voltage regulator for cd-rom drivers. ? voltage regulator for lan cards. ? voltage regulator for microprocessor. ? wireless communication systems. ? battery powered systems. typical application circuit: low dropout linear regulator
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a ordering information: sulr1722a-xx xxx marking diagram: pin configuration sot-23 top view 1: gnd 2: vout 3: vin part no. marking sulr1722a-18ftr bn18g sulr1722a-20ftr bn20g sulr1722a-25ftr bn25g sulr1722a-27ftr bn27g sulr1722a-30ftr bn30g SULR1722A-33FTR bn33g sulr1722a-35ftr bn35g sulr1722a-37ftr bn37g sulr1722a-52ftr bn52g packing type tb: tube tr: taping & reel packaging type f: sot-23 output voltage 15: 1.5v 18: 1.8v 20: 2.0v 25: 2.5v 27: 2.7v 30: 3.0v 33: 3.3v 35: 3.5v 37: 3.7v 38: 3.8v 50: 5.0v 52: 5.2v
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a absolute maximum ratings: input supply voltage ???..................????? ???????????. ?????.. -0.3~8v operating temperature range ...?????????????????????? ?40c to 85c maximum junction temperature ?????????????????????????..125c storage temperature range ???????????????????????..?65c ~ 150c lead temperature (soldering) 10 sec. ???????????????????????260c thermal resistance junction to case sot-23 ?????????????????.?130c/w thermal resistance junction to ambient sot-23..????????..????????180c/w (assume no ambient airflow, no heatsink) absolute maximum ratings are those values beyond which the life of a device may be impaired. test circuit refer to the typical application circuit.
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a electrical characteristics (c in =1 f, c out = 1 f, t a =25 , unless otherwise specified)(note 2) note 1: to avoid output oscillation, aluminum electr olytic output capacitor is recommended and ceramic capacitor is not suggested. note 2: specifications are production tested at t a =25 . specifications over the - 40 to 85 operating temperature range are assured by design, characterization and correlation with statistical quality controls (sqc). note 3: regulation is measured at constant junction temperature, using pulse testing with a low on time. note 4: current limit is measured by pulsing a short time. note 5: dropout voltage is defined as the input to output differential at which the output voltage drops 100mv below the value measured with a 1v differential.
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a typical performance characteristics
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a typical performance characteristics (continued)
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a typical performance characteristics (continued)
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a block diagram pin descriptions vout pin - output pin. gnd pin - power gnd. vin pin - power supply input.
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a application information input-output capacitors linear regulators require input and output capacitors to main tain stability. input capacitor at 1 f with 1 f aluminum electrolytic output capacitor is recommended. power dissipation the sulr1722a obtains thermal-limiting circuitry, which is designed to protect the device against overload condition. for continuous load condition, maximum rating of junction temperature must not be exceeded. it is important to pay more attention in th ermal resistance. it includes junction to case, junction to ambient. the maximum power dissipation of sulr1722a depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the rate of temperature rise is greatly affected by the mounting pad configuration on the pcb, the board material, and the ambient temperature. when the ic mounting with good thermal conductivity is used, the junction temperature will be low even when larg e power dissipation applies. the power dissipation across the device is p = i out (v in -v out ). the maximum power dissipation is: (t j-max - t a ) p max = r ja where t j-max is the maximum allowable junction temperature (125c), and t a is the ambient temperature suitable in application. as a general rule, the lowe r temperature is, the better reliability of the device is. so the pcb m ounting pad should provide maximum thermal conductivity to maintain low device temperature. gnd pin performs a dual function for providing an electrical connection to ground and channeling heat away. therefore, connecting the gnd pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature.
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a physical dimensions sot-23 (unit: mm) note: 1. refer to jedec mo-178. 2. dimension "d" does not include mold flas h, protrusions or gate burrs. mold fl ash, protrusion or gate burrs shall not exceed 10 mil per side. 3. dimension "e1" does not include inter-lead flash or protrusions. 4. controlling dimension is millim eter, converted inch dimensi ons are not necessarily exact.
technical data 300ma low dropout linear regulator data sheet n1580, rev. - ? china - germany - korea - singapore - united states ? ? http://www.smc-diodes.com - sales@ smc-diodes.com ? sulr1722a disclaimer: 1- the information given herein, including the specifications and dimensions, is subject to change without prior notice to impr ove product characteristics. before ordering, purchasers are advised to contact the smc - sangdest microelectronics (nanjing) co., ltd sale s department for the latest version of the datasheet(s). 2- in cases where extremely high reliability is required (suc h as use in nuclear power control, aerospace and aviation, traffic equipment, medical equipment , and safety equipment) , safety should be ensur ed by using semiconductor devices that feature assured safety or by means of users? fail-safe precautions or other arrangement . 3- in no event shall smc - sangdest microelectronics (nanjing) c o., ltd be liable for any damages that may result from an accid ent or any other cause during operation of the user?s units according to the datasheet(s). smc - sangdest microelectronics (nanjing) c o., ltd assumes no responsibility for any intellectual property claims or any other problems that may result from applications of infor mation, products or circuits described in the datasheets. 4- in no event shall smc - sangdest microelectronics (nanjing) c o., ltd be liable for any failure in a semiconductor device or any secondary damage resulting from use at a value exceeding the absolute maximum rating. 5- no license is granted by the datasheet(s) under any patents or other rights of any third party or smc - sangdest microelectr onics (nanjing) co., ltd. 6- the datasheet(s) may not be reproduced or duplicated, in any form, in whole or part, without the expressed written permissio n of smc - sangdest microelectronics (nanjing) co., ltd. 7- the products (technologies) described in the datasheet(s) are n ot to be provided to any party whose purpose in their applica tion will hinder maintenance of international peace and safety nor are they to be applied to that purpose by their direct purchasers or a ny third party. when exporting these products (technologies), the necessary procedures are to be taken in accordance with related laws a nd regulations..

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