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mic5205 micrel june 2000 1 mic5205 general description the mic5205 is an efficient linear voltage regulator with ultra- low-noise output, very low dropout voltage (typically 17mv at light loads and 165mv at 150ma), and very low ground current (600 a at 100ma output). the mic5205 offers better than 1% initial accuracy. designed especially for hand-held, battery-powered devices, the mic5205 includes a cmos or ttl compatible enable/ shutdown control input. when shutdown, power consump- tion drops nearly to zero. regulator ground current increases only slightly in dropout, further prolonging battery life. key mic5205 features include a reference bypass pin to improve its already excellent low-noise performance, re- versed-battery protection, current limiting, and overtemperature shutdown. the mic5205 is available in fixed and adjustable output voltage versions in a small sot-23-5 package. for low-dropout regulators that are stable with ceramic output capacitors, see the cap mic5245/6/7 family. ordering information part number marking voltage accuracy junction temp. range* package mIC5205BM5 lbaa adj 1% C40 c to +125 c sot-23-5 mic5205-2.5bm5 lb25 2.5v 1% C40 c to +125 c sot-23-5 mic5205-2.7bm5 lb27 2.7v 1% C40 c to +125 c sot-23-5 mic5205-2.8bm5 lb28 2.8v 1% C40 c to +125 c sot-23-5 mic5205-2.85bm5 lb2j 2.85v 1% C40 c to +125 c sot-23-5 mic5205-2.9bm5 lb29 2.9v 1% C40 c to +125 c sot-23-5 mic5205-3.0bm5 lb30 3.0v 1% C40 c to +125 c sot-23-5 mic5205-3.3bm5 lb33 3.3v 1% C40 c to +125 c sot-23-5 mic5205-3.6bm5 lb36 3.6v 1% C40 c to +125 c sot-23-5 mic5205-3.8bm5 lb38 3.8v 1% C40 c to +125 c sot-23-5 mic5205-4.0bm5 lb40 4.0v 1% C40 c to +125 c sot-23-5 mic5205-5.0bm5 lb50 5.0v 1% C40 c to +125 c sot-23-5 other voltages available. contact micrel for details. typical application 15 2 3 4 c out = 2.2f tantalum c byp enable shutdown en v out low-noise operation: c byp = 470pf, c out 2.2f basic operation: c byp = not used, c out 1f mic5205-x.xbm5 e n (pin 3) may be c onnected directly t o in (pin 1). v in ultra-low-noise regulator application mic5205 150ma low-noise ldo regulator features ? ultra-low-noise output ? high output voltage accuracy ? guaranteed 150ma output ? low quiescent current ? low dropout voltage ? extremely tight load and line regulation ? very low temperature coefficient ? current and thermal limiting ? reverse-battery protection ? zero off-mode current ? logic-controlled electronic enable applications ? cellular telephones ? laptop, notebook, and palmtop computers ? battery-powered equipment ? pcmcia v cc and v pp regulation/switching ? consumer/personal electronics ? smps post-regulator/dc-to-dc modules ? high-efficiency linear power supplies 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
mic5205 micrel mic5205 2 june 2000 pin configuration in out byp en lbxx part identification 1 3 45 in out adj en lbaa 1 3 45 22 gnd gnd mic5205-x.xbm5 mIC5205BM5 fixed voltages adjustable voltage absolute maximum ratings (note 1) supply input voltage (v in ) ............................ C 20v to +20v enable input voltage (v en ) ........................... C 20v to +20v power dissipation (p d ) ............... internally limited, note 3 lead temperature (soldering, 5 sec.) ....................... 260 c junction temperature (t j ) ....................... C 40 c to +125 c storage temperature (t s ) ....................... C 65 c to +150 c operating ratings (note 2) input voltage (v in ) ....................................... +2.5v to +16v enable input voltage (v en ) .................................. 0v to v in junction temperature (t j ) ....................... C 40 c to +125 c thermal resistance, sot-23-5 ( ja ) ....................... note 3 pin description mic5205-x.x mic5205 pin name pin function (fixed) (adjustable) 1 1 in supply input 2 2 gnd ground 3 3 en enable/shutdown (input): cmos compatible input. logic high = enable, logic low or open = shutdown. 4 byp reference bypass: connect external 470pf capacitor to gnd to reduce output noise. may be left open. 4 adj adjust (input): adjustable regulator feedback input. connect to resistor voltage divider. 5 5 out regulator output
mic5205 micrel june 2000 3 mic5205 electrical characteristics v in = v out + 1v; i l = 100 a; c l = 1.0 f; v en 2.0v; t j = 25 c, bold values indicate C 40 c t j +125 c; unless noted. symbol parameter conditions min typical max units v o output voltage accuracy variation from specified v out C 11% 22 % ? v o / ? t output voltage note 4 40 ppm/ c temperature coefficient ? v o /v o line regulation v in = v out + 1v to 16v 0.004 0.012 % / v 0.05 % / v ? v o /v o load regulation i l = 0.1ma to 150ma, note 5 0.02 0.2 % 0.5 % v in C v o dropout voltage, note 6 i l = 100 a1050mv 70 mv i l = 50ma 110 150 mv 230 mv i l = 100ma 140 250 mv 300 mv i l = 150ma 165 275 mv 350 mv i gnd quiescent current v en 0.4v (shutdown) 0.01 1 a v en 0.18v (shutdown) 5 a i gnd ground pin current, note 7 v en 2.0v, i l = 100 a80125 a 150 a i l = 50ma 350 600 a 800 a i l = 100ma 600 1000 a 1500 a i l = 150ma 1300 1900 a 2500 a psrr ripple rejection frequency = 100hz, i l = 100 a75db i limit current limit v out = 0v 320 500 ma ? v o / ? p d thermal regulation note 8 0.05 %/w e no output noise i l = 50ma, c l = 2.2 f, 260 nv/ hz 470pf from byp to gnd enable input v il enable input logic-low voltage regulator shutdown 0.4 v 0.18 v v ih enable input logic-high voltage regulator enabled 2.0 v i il enable input current v il 0.4v 0.01 C 1 a v il 0.18v 2 a i ih v ih 2.0v 2 5 20 a v ih 2.0v 25 a note 1. exceeding the absolute maximum rating may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3: the maximum allowable power dissipation at any t a (ambient temperature) is p d(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 ja of the mic5205- xxbm5 (all versions) is 220 c/w mounted on a pc board (see thermal considerations section for further details). note 4: output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. note 5: regulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulati on in the load range from 0.1ma to 150ma. changes in output voltage due to heating effects are covered by the thermal regulation specificatio n. note 6: 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 7: ground pin current is the regulator quiescent current plus pass transistor base current. the total current drawn from the supp ly is the sum of the load current plus the ground pin current. note 8: 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 150ma load pulse at v in = 16v for t = 10ms.
mic5205 micrel mic5205 4 june 2000 typical characteristics -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 100 a c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 100 a c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m 0 10 20 30 40 50 60 0 0.1 0.2 0.3 0.4 ripple rejection (db) voltage drop (v) power supply ripple rejection vs. voltage drop i out = 100ma 10ma 1ma c out = 1 f -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 1ma c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 1ma c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 ripple rejection (db) voltage drop (v) power supply ripple rejection vs. voltage drop i out = 100ma 10ma 1ma c out = 2.2 f c byp = 0.01 f -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 10ma c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 10ma c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m 10 100 1000 10000 10 100 1000 10000 time ( s) capacitance (pf) turn-on time vs. bypass capacitance -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 100ma c out = 1 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m -100 -80 -60 -40 -20 0 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 psrr (db) frequency (hz) power supply rejection ratio i out = 100ma c out = 2.2 f c byp = 0.01 f v in = 6v v out = 5v 10 100 1k 10k 100k 1m 10m 0 40 80 120 160 200 240 280 320 0 40 80 120 160 dropout voltage (mv) output current (ma) dropout voltage vs. output current +125 c +25 c C 40 c
mic5205 micrel june 2000 5 mic5205 typical characteristics 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ hz) frequency (hz) noise performance 10 100 1k 10k 100k 1m 10m 1ma c out = 1 f c byp = 10nf 10ma, c out = 1 f v out = 5v 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ hz) frequency (hz) noise performance 10ma 1ma 100ma 10 100 1k 10k 100k 1m 10m v out = 5v c out = 10 f electrolytic 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ noise performance 10ma 1ma 100ma 10 100 1k 10k 100k 1m 10m v out = 5v c out = 22 f tantalum c byp = 10nf 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ noise performance 10ma 1ma 100ma 10 100 1k 10k 100k 1m 10m v out = 5v c out = 10 f electrolytic c byp = 100pf 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ hz) frequency (hz) noise performance 10ma 1ma 100ma 10 100 1k 10k 100k 1m 10m v out = 5v c out = 10 f electrolytic c byp = 1nf 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+6 1e+7 noise ( v/ noise performance 10ma 1ma 100ma 10 1k 100 10k 100k 1m 10m v out = 5v c out = 10 f electrolytic c byp = 10nf
mic5205 micrel mic5205 6 june 2000 block diagrams in en out byp c byp (optional) gnd v ref bandgap ref. current limit thermal shutdown c out v out v in mic5205-x.xbm5 ultra-low-noise fixed regulator in en out c byp (optional) gnd v ref bandgap ref. current limit thermal shutdown c out v out v in r1 r2 mIC5205BM5 adj v out = v ref (1 + r2/r1) ultra-low-noise adjustable regulator
mic5205 micrel june 2000 7 mic5205 applications information enable/shutdown forcing en (enable/shutdown) high (> 2v) enables the regu- lator. en is compatible with cmos logic gates. if the enable/shutdown feature is not required, connect en (pin 3) to in (supply input, pin 1). see figure 1. input capacitor a 1 f capacitor should be placed from in to gnd 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. reference bypass capacitor byp (reference bypass) is connected to the internal voltage reference. a 470pf capacitor (c byp ) connected from byp to gnd quiets this reference, providing a significant reduction in output noise. c byp reduces the regulator phase margin; when using c byp , output capacitors of 2.2 f or greater are generally required to maintain stability. the start-up speed of the mic5205 is inversely proportional to the size of the reference bypass capacitor. applications requiring a slow ramp-up of output voltage should consider larger values of c byp . likewise, if rapid turn-on is necessary, consider omitting c byp . if output noise is not a major concern, omit c byp and leave byp open. output capacitor an output capacitor is required between out and gnd to prevent oscillation. the minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0 f minimum is recommended when c byp is not used (see figure 2). 2.2 f minimum is recommended when c byp is 470pf (see figure 1). larger values improve the regulator s transient response. the output capacitor value may be increased without limit. the output capacitor should have an esr (effective series resistance) of about 5 ? or less and a resonant frequency above 1mhz. ultra-low-esr capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response. most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. since many aluminum electrolytics have electro- lytes that freeze at about C 30 c, solid tantalums are recom- mended for operation below C 25 c. 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. no-load stability the mic5205 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. this is especially important in cmos ram keep-alive applications. thermal considerations the mic5205 is designed to provide 150ma of continuous current in a very small package. maximum power dissipation can be calculated based on the output current and the voltage drop across the part. to determine the maximum power dissipation of the package, use the junction-to-ambient ther- mal resistance of the device and the following basic equation: p = t C t d (max) j(max) a ja () c, and t a is the ambient operating temperature. ja is layout dependent; table 1 shows examples of junction-to- ambient thermal resistance for the mic5205. package ja recommended ja 1" square jc minimum footprint copper clad sot-23-5 (m5) 220 c/w 170 c/w 130 c/w table 1. sot-23-5 thermal resistance the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in C v out ) i out + v in i gnd substituting p d(max) for p d and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. for example, when operating the mic5205-3.3bm5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: p = 125 c C 25 c c/w d(max) () 220 p d(max) = 455mw the junction-to-ambient thermal resistance for the minimum footprint is 220 c/w, from table 1. the maximum power dissipation must not be exceeded for proper operation. using the output voltage of 3.3v and an output current of 150ma, the maximum input voltage can be determined. from the electrical characteristics table, the maximum ground current for 150ma output current is 2500 a or 2.5ma. 455mw = (v in C 3.3v) 150ma + v in 2.5ma 455mw = v in 150ma C 495mw + v in 2.5ma 950mw = v in 152.5ma v in(max) = 6.23v therefore, a 3.3v application at 150ma of output current can accept a maximum input voltage of 6.2v in a sot-23-5 package. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the regulator thermals section of micrel s designing with low-dropout voltage regu- lators handbook.
mic5205 micrel mic5205 8 june 2000 fixed regulator applications 15 2 3 4 2.2f 470pf v out mic5205-x.xbm5 v in figure 1. ultra-low-noise fixed voltage application figure 1 includes a 470pf capacitor for low-noise operation and shows en (pin 3) connected to in (pin 1) for an applica- tion where enable/shutdown is not required. c out = 2.2 f minimum. 15 2 34 1.0f enable shutdown en v out mic5205-x.xbm5 v in figure 2. low-noise fixed voltage application figure 2 is an example of a low-noise configuration where c byp is not required. c out = 1 f minimum. adjustable regulator applications the mIC5205BM5 can be adjusted to a specific output voltage by using two external resistors (figure 3). the resis- tors set the output voltage based on the following equation: v = 1.242v r2 r1 + 1 out ? ? ? ? ? ? this equation is correct due to the configuration of the bandgap reference. the bandgap voltage is relative to the output, as seen in the block diagram. traditional regulators normally have the reference voltage relative to ground and have a different v out equation. resistor values are not critical because adj (adjust) has a high input impedance, but for best results use resistors of 470k ? or less. a capacitor from adj to ground provides greatly improved noise performance. 15 2 3 4 2.2f 470pf v out mIC5205BM5 r1 r2 v in figure 3. ultra-low-noise adjustable voltage application figure 3 includes the optional 470pf noise bypass capacitor from adj to gnd to reduce output noise. dual-supply operation 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.
mic5205 micrel june 2000 9 mic5205 package information 0.20 (0.008) 0.09 (0.004) 0.60 (0.024) 0.10 (0.004) 3.02 (0.119) 2.80 (0.110) 10 0 3.00 (0.118) 2.60 (0.102) 1.75 (0.069) 1.50 (0.059) 0.95 (0.037) ref 1.30 (0.051) 0.90 (0.035) 0.15 (0.006) 0.00 (0.000) dimensions: mm (inch) 0.50 (0.020) 0.35 (0.014) 1.90 (0.075) ref sot-23-5 (m5)
mic5205 micrel mic5205 10 june 2000
mic5205 micrel june 2000 11 mic5205
mic5205 micrel mic5205 12 june 2000 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. ? 2000 micrel incorporated

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