bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com pin connections 1.0a step down switching voltage regulator lm2575 adjustable & fix output pin connection ordering information devices package temp. lm2575t-x to-220 -40 c to 125 c lm2575s-x to-263 -40 c to 125 c lm2575j-x lpdd -40 c to 125 c x= output voltage (x=3.3v, 5.0v, 12v, 15v or blank for adjustable) consult factory for other fixed voltages. description the bay linear lm2575 contains fixed and adjustable switching voltage regulators that require a minimum of external components. all ci rcuitry necessary to build a buck-switching regulator is included. the lm2575 is available in 3.3v; 5v, 12v & 15v fixed voltages, or an adjustable version with an output voltage range from 1.23v to 37v. the guaranteed accuracy for specified input and load conditions is 4%. the lm2575 can supply 1a w ith an excellent load and line regulation. protection such as cycle-by-cycle current limiting or thermal shutdown has been designed. in standby mode, the current consumption has been minimized (200 a). for 3a step-down switching regulators refer to lm2576 data sheets features ? guaranteed 1a output current ? high efficiency ? wide input voltage, up to 40v ? 3.3v, 5v, 12v, 15v and adjustable output versions ? thermal shutdown and current limit protection ? requires only 4 external components ? low power standby mode < 200 a typical ? shutdown capability (standby mode) ? 52khz fixed frequency internal oscillator ? uses standard inductors ? pin-to-pin compatible with lm2575 applications ? efficient pre-regulator for linear regulators ? on-card switching regulators ? positive to negative converter (buck-boost) ? simple high-efficiency step-down (buck) ? bay linear inspire the linear power to-263-5 package top view 45 bay b2575 gnd v out v in 1) 3) 4) 5) fb on/off 2) 1 2 3 to-263-5 package top view 45 bay b2575 gnd v out v in 1) 3) 4) 5) fb on/off 2) 1 2 3 to-220-5 package gnd v out v in 1) 3) 4) 5) 2) fb on/off 5 4 3 2 1 bay b2575 to-220-5 package gnd v out v in 1) 3) 4) 5) 2) fb on/off 5 4 3 2 1 bay b2575
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575 absolute maximum rating parameter symbol value unit maximum input voltage v in 45 v power dissipation p o internally limited w on/off pin input voltage -0.3v bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575 electrical characteristics t a = 25c v in = 12v, i load = 100ma unless otherwise specified. boldface type applies over full op erating temperature range. parameters conditions typ lm2575 min max units adjustable regulator feedback bias current v out = 5v 50 100 500 na fixed and adjustable regulators oscillator frequency 52 47 42 58 63 khz saturation voltage i out = 1a, (note 4) 0.9 1.2 1.4 v max duty cycle (note 5) 98 93 % current limit peak current, t on 3 s, (note 4) 2.2 1.7 1.3 3.0 3.2 a output leakage current v in , (note 6), output = 0v (note 6 ), output = -1v 7.5 2 30 ma quiescent current (note 6) 5 10 ma standby quiescent current on/off pin = 5v (off) 50 200 a thermal resistance t,u package, junction to ambient, (note 7) t,u package, junction to case m 65 2 37 c/w on/off control, fixed & adjustable regulators (note 8) (note9) off input level v out = 0v 1.4 2.2 2.4 v on input level v out = 15v or 5v 1.2 1.0 0.8 v off logic current on/off pin = 5v (off) 4 30 a on logic current on/off pin = 0v (on) 0.01 10 a note 1 : absolute maxium ratings indicate limits beyond which damage to the device may occur. operating ratings indicate test conditions for which th e device s intended to be functional, but do not guarantee specific performance limits. for quaranteed specifications and test conditions see the electrical characteristics. note 2: all limits guaranteed at room temperature (standard type face) and at temperature extremes ( bold type face ). all room temperature limits are 100% production tested. all limits at temperature extremes are guaranteed via testing. note 3: external components such as the diode, inductor and capacitor can affect the system performance. note 4: output (pin 2) sourcing current. no diode, inductor, or capacitor connected to input. note 5: feedback (pin 4) removed from output and connected to 0v. note 6: feedback (pin 4) removed from output and connected to 12v to force the output transistor off. note 7: junction to ambient thermal resi stance with approximately 1 sq uare inches of pc board cooper surrounding the leads. note 8: test circuit refers to figure 2. note 9: test circuit refers to figure 3.
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575 lm2575- 5.0
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575 lm2575- adj lm2575 - fix ou tp u t
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com lm2575 advance information - these data sheets contain descriptions of products that are in development. the specifications are based on the engineering ca lculations, computer simulations and/ or initial prototype evaluation. preliminary information - these data sheets contain minimum and maxi mum specifications that are based on the initial device characterizations. these lim its are subject to change upon the completion of the full characterization over the specif ied temperature and supply voltage ranges. the application circuit examples are only to explain the repres entative applications of the de vices and are not intended to gua rantee any circuit design or permit any industrial property ri ght to other rights to execute. bay linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the da ta book. typical parameters can and do vary in different applications. customer?s technical experts must validate all operating parameters including ? typical? for each customer applic ation. life support and nuclear policy bay linear products are not authorized fo r and should not be used within life suppor t systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications wi thout the specific written consent of bay linear president.
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