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july 1998 1 MIC5201 MIC5201 micrel MIC5201 200ma low-dropout regulator final information general description the MIC5201 is an efficient linear voltage regulator with very low dropout voltage (typically 17mv at light loads and 200mv at 100ma), and very low ground current (1ma at 100ma output), offering better than 1% initial accuracy with a logic compatible on-off switching input. designed especially for hand-held battery powered devices, the MIC5201 can be switched by a cmos or ttl compatible enable signal. this enable control may be connected directly to v in if unneeded. when disabled, power consumption drops nearly to zero. the ground current of the MIC5201 increases only slightly in dropout, further prolonging battery life. key MIC5201 features include current limiting, overtemperature shutdown, and protection against reversed battery. the MIC5201 is available in several fixed voltages and accuracy configurations. it features the same pinout as the lt1121 with better performance. other options are available; contact micrel for details. typical application enable shutdown MIC5201-3.3 in out gnd 1f v out 3.3v en features ? high output voltage accuracy ? variety of output voltages ? guaranteed 200ma output ? low quiescent current ? low dropout voltage ? extremely tight load and line regulation ? very low temperature coefficient ? current and thermal limiting ? reversed-battery protection ? load-dump protection (fixed voltage versions) ? zero off-mode current ? logic-controlled electronic enable ? available in so-8 and sot-223 packages applications ? cellular telephones ? laptop, notebook, and palmtop computers ? battery powered equipment ? pcmcia v cc and v pp regulation/switching ? bar code scanners ? smps post-regulator/ dc-to-dc modules ? high-efficiency linear power supplies mm8 is a trademark of micrel, inc. ordering information part number voltage junction temp. range* package MIC5201bm adj C40 c to +125 c so-8 MIC5201-3.0bm 3.0 C40 c to +125 c so-8 MIC5201-3.3bm 3.3 C40 c to +125 c so-8 MIC5201-5.0bm 5.0 C40 c to +125 c so-8 MIC5201-3.0bs 3.0 C40 c to +125 c sot-223 MIC5201-3.3bs 3.3 C40 c to +125 c sot-223 MIC5201-4.8bs 4.85 C40 c to +125 c sot-223 MIC5201-5.0bs 5.0 C40 c to +125 c sot-223 other voltages available. contact micrel for details. * junction temperature. micrel, inc. ?1849 fortune drive ?san jose, ca 95131 ?usa ?tel + 1 (408) 944-0800 ?fax + 1 (408) 944-0970 ?http://www.mic rel.com
MIC5201 micrel MIC5201 2 july 1998 pin configuration in out gnd 13 2 tab gnd MIC5201-x.xbs sot-223 fixed 1 2 3 4 8 7 6 5 in nc nc en out nc gnd nc MIC5201-x.xbm 8-lead soic fixed 1 2 3 4 8 7 6 5 in nc nc en out adj gnd nc MIC5201bm 8-lead soic adjustable pin description pin no. pin no. pin no. pin name pin function sot-223 so-8 adj. so-8 fixed 3 1 1 out regulated output 2 adj feedback input: (adjustable version only) 4, 6, 7 2, 4, 6, 7 nc not internally connected: connect to ground plane for lowest thermal resistance. 2 3 3 gnd ground 5 5 en enable (input): ttl compatible input. high = enable. low or open = off/disable. 188 v in unregulated supply input absolute maximum ratings supply input voltage (v in ) fixed .................. C 20v to +60v supply input voltage (v in ) adjustable .......... C 20v to +20v enable input voltage (v en ) fixed ................. C 20v to +60v enable input voltage (v en ) adjustable ......... C 20v to +20v power dissipation (p d ) ............................ internally limited junction temperature (t j ) ....................... C 40 c to +125 c lead temperature (soldering, 5 sec.) ....................... 260 c operating ratings supply input voltage (v in ) fixed ................... 2.5v to +26v supply input voltage (v in ) adjustable ........... 2.5v to +16v enable input voltage (v en ) .................................. 0v to v in junction temperature (t j ) ....................... C 40 c to +125 c
july 1998 3 MIC5201 MIC5201 micrel electrical characteristics v in = v out + 1v; i l = 100 a; c l = 3.3 f; v en 2.0v; t j = 25 c, bold values indicate C 40 c t j +85 c; unless noted symbol parameter condition min typ max units v o output voltage accuracy variation from specified v out C 11% ? 2 % ? v o / ? t output voltage temperature coef. note 2 40 150 ppm/ c ? v o /v o line regulation, fixed v in = v out + 1v to 26v 0.004 0.20 % 0.40 % ? v o /v o line regulation, adjustable v in = v out + 1v to 16v 0.004 0.20 % 0.40 % ? v o /v o load regulation i l = 0.1ma to 200ma, note 3 0.04 0.16 % 0.30 % v in C v o dropout voltage, note 4 i l = 100 a17mv i l = 20ma 130 mv i l = 50ma 180 mv i l = 100ma 225 mv i l = 200ma 270 400 mv i gnd quiescent current v enable 0.7v (shutdown) 0.01 a i gnd ground pin current i l = 100 a 130 a i l = 20ma 270 400 a i l = 50ma 500 a i l = 100ma 1000 2000 a i l = 200ma 3000 a psrr ripple rejection 75 db i gnddo ground pin current at dropout v in = 0.5v less than specified v out , 270 330 a i l = 100 a, note 5 i limit current limit v out = 0v 280 500 ma ? v o / ? p d thermal regulation note 6 0.05 %/w e n output noise 100 v enable input v il input voltage level logic low (off) 0.7 v v ih input voltage level logic high (on) 2.0 v i il enable input current v il 0.7v 0.01 1 a i ih enable input current v ih 2.0v 15 50 a reference (MIC5201 adjustable version only) v ref reference voltage 1.223 1.242 1.255 v 1.217 1.267 v i il reference voltage temp. coef. 20 ppm/ c general note: devices are esd sensitive. handling precautions recommended. note 1: absolute maximum ratings indicate limits beyond which damage to the component may occur. electrical specifications do not apply when operating the device outside of its rated operating conditions. the maximum allowable power dissipation is a function of the ma ximum junction temperature, t j(max) , the junction-to-ambient thermal resistance, ja , and the ambient temperature, t a . the maximum allowable power dissipation at any ambient temperature is calculated using: p (max) = (t j(max) C t a ) ja . exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. the jc of the MIC5201-x.xbs is 15 c/w and ja for the MIC5201bm is 160 c/w mounted on a pc board (see thermal considerations section for further details). note 2: output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. note 3: regulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulatio n in the load range from 0.1ma to 200ma. changes in output voltage due to heating effects are covered by the thermal regulation specification . note 4: dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value mea sured at 1v differential. note 5: ground pin current is the regulator quiescent current plus pass transistor base current. the total current drawn from the suppl y is the sum of the load current plus the ground pin current. note 6: thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. specifications are for a 200ma load pulse at v in = 26v for fixed and v in = 16v for adjustable at t = 10ms.
MIC5201 micrel MIC5201 4 july 1998 block diagrams current limit thermal shutdown in out gnd bandgap ref. c out v out v in MIC5201-x.xbs fixed regulator (sot-223 version only) in en out gnd v ref bandgap ref. current limit thermal shutdown c out v out v in MIC5201-x.xbm fixed regulator in en out gnd v ref bandgap ref. current limit thermal shutdown c out v out v in r1 r2 MIC5201bm [adj.] adj adjustable regulator
july 1998 5 MIC5201 MIC5201 micrel typical characteristics 0 50 100 150 200 250 0.01 0.1 1 10 100 1000 dropout voltage (mv) output current (ma) dropout voltage vs. output current 0.0 0.1 0.2 0.3 0.4 -60 -30 0 30 60 90 120 150 dropout voltage (v) temperature ( c) dropout voltage vs. temperature i l = 100ma i l = 1ma 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0246810 output voltage (v) input voltage (v) dropout characteristics i l = 100ma i l = 100 a, 1ma 0.1 1 10 0.01 0.1 1 10 100 ground current (ma) output current (ma) ground current vs. output current 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0246810 ground current (ma) supply voltage (v) ground current vs. supply voltage i l = 100ma i l = 1ma 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0.0 0.1 0.2 0.3 output voltage (v) output current (a) output voltage vs. output current c in = 2.2 f c out = 4.7 f 0.15 0.20 0.25 0.30 -60 -30 0 30 60 90 120 150 ground current (ma) temperature ( c) ground current vs. temperature i load = 100 a c in = 2.2 f c out = 4.7 f 1.0 1.1 1.2 1.3 1.4 1.5 -50 0 50 100 150 ground current (ma) temperature ( c) ground current vs. temperature i load = 100ma c in = 2.2 f c out = 4.7 f -100 0 100 200 -5 0 5 10 15 20 25 30 35 load (ma) time (ms) thermal regulation (3.3v version) -50 0 50 100 ? output (mv) c l = 4.7 f 3.0 3.1 3.2 3.3 3.4 3.5 3.6 -60 -30 0 30 60 90 120 150 output voltage (v) temperature ( c) output voltage vs. temp. (3.3v version) c in = 2.2 f c out = 4.7 f 3 devices: hi / avg / lo curves applicable at 100 a and 100ma 100 120 140 160 180 200 220 240 260 280 300 -60 -30 0 30 60 90 120 150 output current (ma) temperature ( c) output current vs. temperature v out = 0v (short circuit) v out = 3.3v 3.20 3.21 3.22 3.23 3.24 3.25 3.26 3.27 3.28 3.29 3.30 -60 -30 0 30 60 90 120 150 min. input voltage (v) temperature ( c) minimum input voltage vs. temperature c in = 2.2 f c out = 4.7 f i load = 1ma
MIC5201 micrel MIC5201 6 july 1998 0 50 100 150 200 250 300 1234567 short circuit current (ma) input voltage (v) short circuit current vs. input voltage c in = 2.2 f c out = 4.7 f v out = 3.3v -30 -20 -10 0 10 20 ? output (mv) 0 100 200 300 -2 0246810 output (ma) time (ms) load transient c l = 4.7 f 0 100 200 300 -10 0 10203040 output (ma) time (ms) load transient -30 -20 -10 0 10 20 ? output (mv) c l = 47 f 0 20 40 60 80 100 120 012345678910 supply current (ma) supply voltage (v) supply current vs. supply voltage (3.3v version) r l = 33 ? -10 -5 0 5 10 ? output (mv) 2 4 6 8 -0.2 0 0.2 0.4 0.6 0.8 input (v) time (ms) line transient c l = 1 f i l = 1ma -5 0 5 10 15 ? output (mv) 2 4 6 8 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 input (v) time (ms) line transient c l = 10 f i l = 1ma 0 10 20 30 40 50 60 01234567 supply current (ma) supply voltage (v) supply current vs. supply voltage (3.3v version) r l = 66 ? -1 0 1 2 3 4 5 output (v) -2 0 2 4 -50 0 50 100 150 200 250 300 enable (v) time ( s) enable transient (3.3v version) c l = 4.7 f i l = 1ma -1 0 1 2 3 4 5 output (v) -2 0 2 4 -50 0 50 100 150 200 250 300 enable (v) time ( s) enable transient (3.3v version) c l = 4.7 f i l = 100ma 0.001 0.01 0.1 1 10 100 1000 1x10 0 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 output impedance ( ? ) frequency (hz) output impedance i l = 100 a i l = 1ma i l = 100ma -5 0 5 10 15 20 25 30 35 -60 -30 0 30 60 90 120 150 enable current ( a) temperature ( c) enable current threshold vs. temperature c in = 2.2 f c out = 4.7 f v en = 2v v en = 5v 0.4 0.6 0.8 1 1.2 1.4 1.6 -60 -30 0 30 60 90 120 150 enable voltage (v) temperature ( c) enable voltage threshold vs. temperature c in = 2.2 f c out = 4.7 f off on
july 1998 7 MIC5201 MIC5201 micrel 0 20 40 60 80 100 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 ripple voltage (db) frequency (hz) ripple vs. frequency i l = 100 a 0 20 40 60 80 100 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 ripple voltage (db) frequency (hz) ripple vs. frequency i l = 1ma 0 20 40 60 80 100 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 ripple voltage (db) frequency (hz) ripple vs. frequency i l = 100ma
MIC5201 micrel MIC5201 8 july 1998 applications information figure 1 shows a basic fixed-voltage application with the unused enable input connected to v in . MIC5201-x.xbm MIC5201-x.xbs in out gnd 1f v in v out en figure 1. fixed application adjustable regulators require two resistors to set the output voltage. see figure 2. MIC5201bm in out gnd v in en adj 3.3f v out r1 r2 v 1.242v 1 r2 r1 out =+ ? ? ? ? ? ? figure 2. adjustable application resistors values are not critical because adj (adjust) has a high impedance, but for best results use resistors of 470k ? or less. output capacitors a 1 f capacitor is recommended between the MIC5201 output and ground to prevent oscillations due to instability. larger values serve to improve the regulator s transient response. most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. many aluminum electrolytics have electrolytes that freeze at about C 30 c, so solid tanta- lums are recommended for operation below C 25 c. the important parameters of the capacitor are an effective series resistance of about 5 ? or less and a resonant frequency above 500khz. the value of this capacitor may be increased without limit. at lower values of output current, less output capacitance is required for output stability. the capacitor can be reduced to 0.47 f for current below 10ma or 0.33 f for currents below 1ma. input capacitors a 1 f capacitor should be placed from the MIC5201 input to ground if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. noise reduction capacitors on adjustable devices, a capacitor from adj to gnd will decrease high-frequency noise on the output. see figure 3. MIC5201bm in out gnd v in en adj 3.3f v out r1 r2 c adj figure 3. decreasing ouput noise minimum load the MIC5201 will remain stable and in regulation with no load unlike many other voltage regulators. this is especially important in cmos ram keep-alive applications. dual-supply systems when used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.thermal considerations layout the MIC5201-x.xbm (8-pin surface mount package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. d r a o b c p c i r t c e l e i d a j 4 r fw / c 0 6 1 c i m a r e cw / c 0 2 1 multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. the worst case value of 160 c/w assumes no ground plane, minimum trace widths, and a fr4 material board. nominal power dissipation and die temperature the MIC5201-x.xbm at a 25 c ambient temperature will operate reliably at up to 625mw power dissipation when mounted in the worst case manner described above. at an ambient temperature of 55 c, the device may safely dissi- pate 440mw. these power levels are equivalent to a die temperature of 125 c, the recommended maximum tem- perature for non-military grade silicon integrated circuits. for MIC5201-x.xbs (sot-223 package) heat sink character- istics, please refer to micrel application hint 17, p.c. board heat sinking . 245 mil 30 mil 50 mil 50 mil 150 mil figure 4. min. recommended so-8 pcb pads size
july 1998 9 MIC5201 MIC5201 micrel package information 45 0 C 8 0.244 (6.20) 0.228 (5.79) 0.197 (5.0) 0.189 (4.8) seating plane 0.026 (0.65) max ) 0.010 (0.25) 0.007 (0.18) 0.064 (1.63) 0.045 (1.14) 0.0098 (0.249) 0.0040 (0.102) 0.020 (0.51) 0.013 (0.33) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) typ pin 1 dimensions: inches (mm) 0.050 (1.27) 0.016 (0.40) 8-pin sop (m) 16 10 0.84 (0.033) 0.64 (0.025) 1.04 (0.041) 0.85 (0.033) 2.41 (0.095) 2.21 (0.087) 4.7 (0.185) 4.5 (0.177) 6.70 (0.264) 6.30 (0.248) 7.49 (0.295) 6.71 (0.264) 3.71 (0.146) 3.30 (0.130) 3.15 (0.124) 2.90 (0.114) 10 max 0.10 (0.004) 0.02 (0.0008) 0.038 (0.015) 0.25 (0.010) c l dimensions: mm (inch) c l 1.70 (0.067) 1.52 (0.060) 0.91 (0.036) min sot-223 (s)
MIC5201 micrel MIC5201 10 july 1998
july 1998 11 MIC5201 MIC5201 micrel
MIC5201 micrel MIC5201 12 july 1998 micrel inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 web http://www.micrel.com this information is believed to be accurate and reliable, however no responsibility is assumed by micrel for its use nor for an y infringement of patents or other rights of third parties resulting from its use. no license is granted by implication or otherwise under any patent or pat ent right of micrel inc. ? 1998 micrel incorporated

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