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lm2575 52khz simple 1a buck regulator micrel inc. 2180 fortune drive san jose, ca 95131 usa tel +1 ( 408 ) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com may 2009 1 m9999-051209-b general description the lm2575 series of monolithic integrated circuits provide all the active functi ons for a step-down (buck) switching regulator. fixed versions are available with a 3.3v, 5v, 12v, fixed output. adjustable versions have an output voltage range from 1.23v to 37v. both versions are capable of driving a 1a load with excellent line and load regulation. these regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator. the lm2575 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. it substantially reduces the size of the heat sink, and in many cases no heat sink is required. a standard series of inductors available from several different manufacturers are ideal for use with the lm2575 series. this feature greatly simplifies the design of switch- mode power supplies. the feedback voltage is guaranteed to 2% tolerance for adjustable versions, and the output voltage is guaranteed to 3% for fixed versions, wi thin specified input voltages and output load conditions. the oscillator frequency is guaranteed to 10%. external shutdown is included, featuring less than 200a standby current. the output switch includes cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions. data sheets and support documentation can be found on micrels web site at www.micrel.com. features ? 3.3v, 5v, 12v, and adjustable output versions ? voltage over specified line and load conditions: C fixed version: 3% max. output voltage C adjustable version: 2% max. feedback voltage ? guaranteed 1a output current ? wide input voltage range C 4v to 40v ? wide output voltage range C 1.23v to 37v ? requires only 4 external components ? 52khz fixed frequency internal oscillator ? low power standby mode iq typically <200a ? 80% efficiency (adjustable version typically >80%) ? uses readily avail able standard inductors ? thermal shutdown and current limit protection ? 100% electrical thermal limit burn-in applications ? simple high-efficiency st ep-down (buck) regulator ? efficient pre-regulator for linear regulators ? on-card switching regulators ? positive to negative converter (inverting buck-boost) ? isolated flyback converter using minimum number of external components ? negative boost converter ___________________________________________________________________________________________________________ typical applications 7vC40v unregulated dc input lm2575-5.0 + c in 100f +v in 1 3 gnd 5 on/off 2 output 4 feedback l1 330h + d1 1n5822 c out 330f +5v, 1a regulated output note: pin numbers are for to-220 package r2r1 7vC40v unregulated dc input lm2575 + c in 100f +v in 1 3 gnd 5 on/off 2 output 4 feedback l1 330h + d1 1n5822 c out 330f r2 3.09k r1 1k v out = 1.23 1 + () +5v, 1a regulated output note: pin numbers are for to-220 package fixed regulation in typical application adjustable regulation in fixed output application downloaded from: http:///
micrel, inc. lm2575 may 2009 2 m9999-051209-b ordering information part number standard pb-free / rohs compliant temperature range package lm2575bn* contact factory C40 to +85c 16-pin plastic dip lm2575-3.3bn contact factory C40 to +85c 16-pin plastic dip lm2575-5.0bn lm2575-5.0yn C40 to +85c 16-pin plastic dip lm2575-12bn lm2575-12yn C40 to +85c 16-pin plastic dip lm2575bwm* lm2575ywm* C40 to +85c 24-pin wide soic lm2575-3.3bwm lm2575-3.3ywm C40 to +85c 24-pin wide soic lm2575-5.0bwm lm2575-5.0ywm C40 to +85c 24-pin wide soic lm2575-12bwm lm2575-12ywm C40 to +85c 24-pin wide soic lm2575bt* ? lm2575wt*/** C40 to +85c 5-pin to-220 lm2575-3.3bt ? lm2575-3.3wt** C40 to +85c 5-pin to-220 lm2575-5.0bt ? lm2575-5.0wt** C40 to +85c 5-pin to-220 lm2575-12bt ? lm2575-12wt** C40 to +85c 5-pin to-220 lm2575bu* lm2575wu*/** C40 to +85c 5-pin to-263 lm2575-3.3bu lm2575-3.3wu** C40 to +85c 5-pin to-263 lm2575-5.0bu lm2575-5.0wu** C40 to +85c 5-pin to-263 lm2575-12bu lm2575-12wu** C40 to +85c 5-pin to-263 notes: * adjustable output regulators. ** rohs compliant with "high-melting solder" exemption. ? contact factory for bent or staggered leads option. downloaded from: http:///
micrel, inc. lm2575 may 2009 3 m9999-051209-b pin configuration tab 3 gnd 4fb 5 on/of f 2 out 1 vin tab 5 on/of f 4fb 3 gnd 2 out 1 vin 5-pin to-220 (t) 5-pin to-263 (u) 1 ncnc out nc gnd nc fb nc 16 vin ncgnd gnd gnd gnd nc on/off 1514 13 12 11 10 9 23 4 5 6 7 8 pwr gnd nc 13 12 nc vin 14 11 1 pwr gnd ncnc nc nc nc fb sig gnd nc on/off 24 nc ncnc nc nc nc out out nc vin 2322 21 20 19 18 17 16 15 23 4 5 6 7 8 9 10 16-pin plastic dip (n) 24-pin wide soic (wm) downloaded from: http:///
micrel, inc. lm2575 may 2009 4 m9999-051209-b absolute maximum ratings (1) maximum supply voltage (v in ) ......................................45v on/off pin input voltage. ......................C0.3v v +40v output voltage to grou nd (steady state) ......................C1v power dissipation .....................................in ternally limited maximum junction te mperatur e................................ 150c lead temperature (solde ring, 10 se c.)...................... 260c storage temperature (t s ) .........................C65c to +150c minimum esd rating c = 100pf, r = 1.5k ? .............................................. 2kv fb pin ...................................................................... 1kv operating ratings supply voltage (v in )....................................................... 40v junction temperature range (t j ).......C40c t j +125c electrical characteristics specifications with sta ndard typeface are for t j = 25c, and those with boldface type apply over full operating temperature range. unless otherwise specified, v in = 12v, and i load = 200ma. symbol parameter condition typ lm2575 limit (note 2) units (limits) system parameters, adjustable regulators (note 3) test circuit figure 1 feedback voltage v in = 12v , i load = 0.2a v out = 5v 1.230 1.217 1.243 v v(min) v(max) v out feedback voltage lm2575 0.2a i load 1a, 8v v in 40v v out = 5v 1.230 1.193/ 1.180 1.267/ 1.280 v v(min) v(max) efficiency v in = 12v, i load = 1a, v out = 5v 82 % system parameters, 3.3v regulators (note 3) test circuit figure 1 output voltage v in = 12v , i load = 0.2a v out = 3.3v 3.3 3.234 3.366 v v(min) v(max) v out output voltage lm2575-3.3 0.2a i load 1a, 8v v in 40v v out = 3.3v 3.3 3.168/ 3.135 3.432/ 3.465 v v(min) v(max) efficiency v in = 12v, i load = 1a 75 % system parameters, 5v regulators (note 3) test circuit figure 1 output voltage v in = 12v , i load = 0.2a v out = 5v 5.0 4.900 5.100 v v(min) v(max) v out output voltage lm2575-5.0 0.2a i load 1a, 8v v in 40v v out = 5v 5.0 4.800/ 4.750 5.200/ 5.250 v v(min) v(max) efficiency v in = 12v, i load = 1a 82 % system parameters, 12v regulators (note 3) test circuit figure 1 output voltage v in = 25v , i load = 0.2a v out = 12v 12 11.760 12.240 v v(min) v(max) v out output voltage lm2575-12 0.2a i load 1a, 15v v in 40v v out = 12v 12 11.520/ 11.400 12.480/ 12.600 v v(min) v(max) efficiency v in = 25v, i load = 1a 88 % downloaded from: http:///
micrel, inc. lm2575 may 2009 5 m9999-051209-b symbol parameter condition typ lm2575 limit (note 2) units (limits) device parameters, adjustable regulator i b feedback bias current v out = 5v 50 100/ 500 na device parameters, fixed and adjustable regulators f o oscillator frequency 52 47/ 42 58/ 63 khz khz(min) khz(max) v sat saturation voltage i out = 1a ( note 4 ) 0.9 1.2/ 1.4 v v(max) dc max duty cycle (on) ( note 5 ) 98 93 % %(max) i cl current limit peak current, t on 3s ( note 4 ) 2.2 1.7/ 1.3 3.0/ 3.2 a a(min) a(max) i l output leakage current v in = 40v, ( note 6 ), output = 0v output = C1v ( note 6 ) output = C1v 75 2 30 ma(max) ma ma(max) i q quiescent current ( note 6 ) 5 10 ma ma(max) i stby standby quiescent current on/off pin = 5v (off) 50 200 a a(max) ja t package, junction to ambient ( note 7 ) 65 ja t package, junction to ambient ( note 8 ) 45 jc t package, junction to case 2 ja n package, junction to ambient ( note 9 ) 85 ja thermal resistance wm package, junction to ambient ( note 9 ) 100 c/w on/off control, fixed and adjustable regulators test circuit figure 1 v ih v il on/off pin logic input level v out = 0v v out = 5v 1.4 1.2 2.2/ 2.4 1.0/ 0.8 v(min) v(max) i ih on /off pin = 5v (off) 4 30 a a(max) i il on/off pin logic current on /off pin = 0v (on) 0.01 10 a a(max) notes: 1. absolute maximum rating indicate limits beyond which damage to the device may occur. operat ing ratings indicate conditions for which the device is intended to be functional, but do not guarantee specif ic performance limits. for guaranteed specifications and test co nditions, see the electrical characteristics. 2. all limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face) . all room temperature limits are100% production tested. all limits at temperature extreme are guaranteed via testing. 3. external components such as the catch diode, inductor, input and output capacitors can affect switching regulator system pe rformance. when the lm2575/lm1575 is used as shown in fi gure 1 test circuit, system performance will be shown in system parameters section of electrical characteristics. 4. output (pin 2) sourcing current. no di ode, inductor or capacitor connected to output. 5. feedback (pin 4) removed from output and connected to 0v. 6. feedback (pin 4) removed from output and connec ted to 12v to force the output transistor off. 7. junction to ambient thermal resistance (no external heat si nk) for the 5-pin to-220 package mounted vertically, with 1/2" l eads in a socket, or on pc board with minimum copper area. 8. junction to ambient thermal resistance (no external heat si nk) for the 5-pin to-220 package mounted vertically, with 1/4" l eads soldered to pc board containing approximately 4 squar e inches of copper area surrounding the leads. 9. junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. addition al copper will lower thermal resistance further. downloaded from: http:///
micrel, inc. lm2575 may 2009 6 m9999-051209-b test circuits and layout guidelines lm2575 + 100f +v in 1 3 gnd 5 on/off 2 output 4 feedback l1 330h + d1 mbr360 c out 470f r2r1 v out 5.00v 7v - 40v unregulated dc input c in lo a d c in 100f, 75v aluminum electrolytic c out 470f, 15v aluminum electrolytic d1 schottky, mbr360 l1 330h, 415-0926 (aie) r1 1k, 0.01% r2 3.065k, 0.01% 5-pin to-220 socket2936 (loranger mfg. co.) 4-pin to-3 socket8112-ag7 (augat inc.) lm2575-5.0 + 100f +v in 1 3 gnd 5 on/off 2 output 4 feedback l1 330h + d1 mbr360 c out 220f v out 5.00v note: pin numbers are for to-220 package 7v - 40v unregulated dc input c in c in 100f, 75v aluminum electrolytic c out 330f, 15v aluminum electrolytic d1 schottky,mbr360 l1 330h, 415-0926 (aie) 5-pin to-220 socket 2936 (loranger mfg. co.) 4-pin to-3 socket 8112-ag7 (augat inc.) lo a d figure 1. as in any switching regulator, layout is very important. rapidly switching currents associated with wiring inductance generate voltage transient switch can cause problems. for minimal stray inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. single-point grounding (as indicated) or ground plane construction should be used for best results. downloaded from: http:///
micrel, inc. lm2575 may 2009 7 m9999-051209-b typical characteristics (circuit of figure 1 ) supply current input voltage (v) supply current (ma) 20 measured at ground pin t j v out = 5v 1816 14 12 10 86 4 0 102030405060 i load to 1a supply current vs. duty cycle duty cycle (%) 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.0 0 020406080100 v in from 7v to 40v i load = 200 ma supply current (ma) 200150 100 50 0 -75 v in = 12v standby quiescent current (a) standb y quiescent current v in = 40v -50 -25 0 25 50 75 100 125150 current limit 32 1 0 -75 v in = 25v output current (a) input voltage (v) 100 efficiency (%) efficiency v out = 12v -50 -25 0 25 50 75 100125 150 9590 85 80 75 70 65 60 200 ma 200 ma v out = 3v 1a 0 5 10 15 20 25 30 35 40 minimum operating voltage 5.0 i load = 200 ma input voltage (v) line regulation input voltage (v) 14 0 normalized feedback voltage (mv) 100 -100 -75 standby quiescent current (a) feedback pin current -50 -25 0 25 50 75 100 125150 v out = 1.23v 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -75 -50 -25 0 25 50 75 100125150 1210 86 4 2 0 -2-4 -6 5 1015202530 7550 25 0 -25 -50 -75 +8 -8 -75 normalized frequency (%) oscillator frequency -50 -25 0 25 50 75 100125150 +6+4 +2 0 -2-4 --6 v in = 12v v in = 40v normalized at 25 c normalized tov in = 10v v out = 5v i load = 500ma t j = 25 v on/off = 5v switch saturation voltage switch current (a) 1.2 -55 c 1.0 0.8 0.6 0.4 0 saturation voltage (v) 0.20.40.60.81.0 25 c 125 c 150 c -40 c dropout voltage input-output differential (v) 2.0 -75 -50 -25 0 25 50 75 100125150 v out = 5% r ind = 0. 2 i load = 1a i load = 200 ma 1.5 1.0 0.5 0 normalized output voltage output voltage change (mv ) 100 75 50 25 0 -25 -50 -75 -100 -75 -50 -25 0 25 50 75 100125150 v in = 12v i load = 200ma normalized tot j = 25 c 1a downloaded from: http:///
micrel, inc. lm2575 may 2009 8 m9999-051209-b typical characteristics (continued) normalize d feedback voltage* normalized feedback voltage (mv) 25 20 15 10 5 0 -5 -10-15 -20 -25 -75 -50 -25 0 25 50 75 100125150 v in = 12v i load = 200ma normalized to t j = 25 c feedback voltag e vs duty cycle* duty cycle (%) feedback voltage change (mv) 2015 10 50 -5 -10-15 -20 i load = 200 ma v in = 40v v in = 7v 020406080100 * adjustable version only downloaded from: http:///
micrel, inc. lm2575 may 2009 9 m9999-051209-b functional characteristics (circuit of figure 1 ) load transient response 100s/div. +100mv 0 C100mv output voltage change 1.0a 0.5a 0 output current v out = 5v switching waveforms 10v 0 1a 0 1a .5a 0 a bc d a: output pin voltage 10v/div b: output pin current 1a/div c: inductor current 0.5a/div d: output ripple voltage 20 mv/div. ac coupled horizontal time base: 5s/div v out = 5v v in = 20v functional diagrams on/off comparator fixed gain error amp 1 amp switch out driver + - +- v in fb 1.23v band-gap reference 52 khz oscillator reset thermal shutdown current limit 52 3 1 note: pin numbers are for the to-220 package internal regulator on/off gnd 3.1k 1.0k 4 fixed regulator on/off comparator fixed gain error amp 1 amp switch out driver + - +- v in fb 1.23v band-gap reference 52 khz oscillator reset thermal shutdown current limit 52 3 14 internal regulator on/off gnd adjustable regulator downloaded from: http:///
micrel, inc. lm2575 may 2009 10 m9999-051209-b package information 0.020 (0.508) 0.0180.003 (0.4570.076) pin 1 0.780 (19.812) .2500.005 (6.3500.127) 0.0250.015 (0.6350.381) 0.1000.010 (2.5400.254) max 0.030-0.110 (0.762-2.794) rad 0.125 (3.175) min 0.020 (0.508) min 0.1300.005 (3.3020.127) +0.025C0.015 +0.635 C0.381 0.3258.255 () 0.009-0.015 (0.229-0.381) 0-10 0.290-0.320 (7.336-8.128) 0.040 (1.016) typ 16-pin plastic dip (n) 24-pin wide soic (wm) downloaded from: http:///
micrel, inc. lm2575 may 2009 11 m9999-051209-b 5-pin to-220 (t) 5-pin to-263 (t) downloaded from: http:///
micrel, inc. lm2575 may 2009 12 m9999-051209-b micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchasers use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2000 micrel, incorporated. downloaded from: http:///

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