mic5207 micrel, inc. march 2005 1 mic5207 general description the mic5207 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 (720 a at 100ma output). the mic5207 offers better than 3% initial accuracy. designed especially for hand-held, battery-powered devices, the mic5207 includes a cmos or ttl compatible enable/ shutdown control input. when shutdown, power consump- tion drops nearly to zero. key mic5207 features include a reference bypass pin to improve its already low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown. the mic5207 is available in fixed and adjustable output voltage versions in a small sot-23-5 package. contact micrel for details. for low-dropout regulators that are stable with ceramic output capacitors, see the cap mic5245/6/7 family. ordering information part number* standard marking code pb-free marking code voltage temp range package mic5207bm5 leaa mic5207ym5 leaa adj C40 c to +125 c sot-23-5 mic5207-1.8bd5 ne18 mic5207-1.8yd5 ne18 1.8 C40 c to +125 c thin sot-23-5 mic5207-1.8bm5 le18 mic5207-1.8ym5 le18 1.8 C40 c to +125 c sot-23-5 mic5207-2.5bm5 le25 mic5207-2.5ym5 le25 2.5 C40 c to +125 c sot-23-5 mic5207-2.8bm5 le28 mic5207-2.8ym5 le28 2.8 C40 c to +125 c sot-23-5 contact factory le29 mic5207-2.9ym5 le29 2.9 C40 c to +125 c sot-23-5 mic5207-3.0bm5 le30 mic5207-3.0ym5 le30 3.0 C40 c to +125 c sot-23-5 contact factory le31 mic5207-3.1ym5 le31 3.1 C40 c to +125 c sot-23-5 mic5207-3.2bm5 le32 mic5207-3.2ym5 le32 3.2 C40 c to +125 c sot-23-5 mic5207-3.3bm5 le33 mic5207-3.3ym5 le33 3.3 C40 c to +125 c sot-23-5 mic5207-3.6bm5 le36 mic5207-3.6ym5 le36 3.6 C40 c to +125 c sot-23-5 mic5207-3.8bm5 le38 mic5207-3.8ym5 le38 3.8 C40 c to +125 c sot-23-5 mic5207-4.0bm5 le40 mic5207-4.0ym5 le40 4.0 C40 c to +125 c sot-23-5 mic5207-5.0bm5 le50 mic5207-5.0ym5 le50 5.0 C40 c to +125 c sot-23-5 mic5207-3.3bz --- mic5207-3.3yz 3.3 C40 c to +125 c to-92 *o ther voltages available. contact micrel marketing for information. **under bar symbol (_) may not be to scale. mic5207 180ma low-noise ldo regulator final information features ?u ltra-low-noise output ?h igh output voltage accuracy ? guaranteed 180ma 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 ?h igh-efficiency linear power supplies micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.mic rel.com
mic5207 micrel, inc. mic5207 2 march 2005 in out gnd 123 (bottom view) mic5207-x.xbz to-92 (fixed voltages) pin configuration absolute maximum ratings (note 1) supply input voltage (v in ) ............................ C20v to +20v enable input voltage (v en ) ........................... C20v to +20v power dissipation (p d ) ............... internally limited, note 3 lead temperature (soldering, 5 sec.) ....................... 260 c junction temperature (t j ) all except 1.8v ...................................... C40 c to +125 c 1.8v only .................................................. 0 c to +125 c storage temperature (t s ) ....................... C65 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 ) all except 1.8v ...................................... C40 c to +125 c 1.8v only .................................................. 0 c to +125 c thermal resistance ( ja ) ......................................... note 3 pin description pin no. pin no. pin name pin function sot-23-5 to-92 11 in supply input 22 gnd ground 3e n enable/shutdown (input): cmos compatible input. logic high = enable, logic low or open = shutdown. 4 (fix) byp reference bypass: connect external 470pf capacitor to gnd to reduce output noise. may be left open. for 1.8v or 2.5v operation, see applications information. 4 (adj) adj adjust (input): adjustable regulator feedback input. connect to resistor voltage divider. 53 out regulator output in out byp en lexx 1 3 45 2 gnd mic5207-x.xbm5 sot-23-5 mic5207-x.xbd5 tsot-23-5 (fixed voltages) part identification in out adj en leaa 1 3 45 2 gnd mic5207bm5 sot-23-5 (adjustable voltage) t ypical application battery-powered regulator application 15 2 3 4 c out = 2.2f tantalum c byp (optional) enable shutdown enable v out low-noise operation: c byp = 470pf, c out 2.2f mic5207-x.xbm5 en (pin 3) may be connected directly to in (pin 1). v in
mic5207 micrel, inc. march 2005 3 mic5207 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 C40 c t j +125 c except 0 c t j +125 c for 1.8v version; unless noted. symbol parameter conditions min typical max units v o output voltage accuracy variation from specified v out C3 3 % C4 4 % ? 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 0.005 0.05 %/v 0.10 %/v ? v o /v o load regulation i l = 0.1ma to 150ma, note 5 0.05 0.5 % 0.7 % v in C v o dropout voltage, note 6 i l = 100 a1760mv 80 mv i l = 50ma 115 175 mv 250 mv i l = 100ma 140 280 mv 325 mv i l = 150ma 165 300 mv 400 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 a80 130 a 170 a i l = 50ma 350 650 a 900 a i l = 100ma 720 1100 a 2000 a i l = 150ma 1800 2500 a 3000 a psrr ripple rejection 75 db 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 C1 a v il 0.18v C2 a i ih v ih 2.0v 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) Ct a ) ja . exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. the ja of the sot-23-5 (m5) is 235 c/w and the to-92 (z) is 180 c/w (0.4" leads) or 160 c/w (0.25" leads) soldered to a pc board. see thermal considerations. 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 regulatio n in the load range from 0.1ma to 180ma. changes in output voltage due to heating effects are covered by the thermal regulation specification . note 6: dropout voltage is the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential. note 7: 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 8: thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, exc luding load or line regulation effects. specifications are for a 180ma load pulse at v in = 16v for t = 10ms.
mic5207 micrel, inc. mic5207 4 march 2005 t ypical characteristics -100 -80 -60 -40 -20 0 1e+11e+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+11e+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 00.10.20 .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+11e+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+11e+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 00.10.20 .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+11e+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+11e+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+41e+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+31e+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 04080 120 160 dropout voltage (mv) output current (ma) dropout voltage vs. output current +125 c +25 c C40 c
mic5207 micrel, inc. march 2005 5 mic5207 t ypical characteristics 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+51e+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+61e+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+61e+7 noise ( v/ hz) frequency (hz) 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+61e+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 = 100pf 0.0001 0.001 0.01 0.1 1 10 1e+1 1e+2 1e+3 1e+4 1e+5 1e+61e+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+61e+7 noise ( v/ hz) frequency (hz) noise performance 10ma 1ma 100ma 10 1k 100 10k 100k 1m 10m v out = 5v c out = 10 f electrolytic c byp = 10nf
mic5207 micrel, inc. mic5207 6 march 2005 block diagrams current limit thermal shutdown in out gnd bandgap ref. c out v out v in mic5207-x.xbz low-noise fixed regulator (to-92 version only) in en out byp c byp (optional) gnd v ref bandgap ref. current limit thermal shutdown c out v out v in mic5207-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 mic5207bm5 adj ultra-low-noise adjustable regulator
mic5207 micrel, inc. march 2005 7 mic5207 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 () t j(max) is the maximum junction temperature of the die, 125 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 mic5207. package ja recommended ja 1" square jc minimum footprint copper clad sot-23-5 (m5) 235 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 mic5207-3.3bm5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: p 125c 25c 235 d(max) = ? p 425mw d(max) = 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 3000 a or 3ma. 455mw = (v in C 3.3v) 150ma + v in 3ma 455mw = v in 150ma C 495mw + v in 3ma 920mw = v in 153ma v in(max) = 6.01v therefore, a 3.3v application at 150ma of output current can accept a maximum input voltage of 6v in a sot-23-5 pack- age. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the regulator thermals sec- tion of micrels designing with low-dropout voltage regula- tors handbook. low-voltage operation the mic5207-1.8 and mic5207-2.5 require special consid- eration when used in voltage-sensitive systems. they may momentarily overshoot their nominal output voltages unless appropriate output and bypass capacitor values are chosen. during regulator power up, the pass transistor is fully satu- rated for a short time, while the error amplifier and voltage reference are being powered up more slowly from the output 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 mic5207 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 regulators 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 C30 c, solid tantalums are recom- mended for operation below C25 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 mic5207 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 mic5207 is designed to provide 180ma of continuous current in a very small package. maximum power dissipation can be calculated based on the output current and the voltage
mic5207 micrel, inc. mic5207 8 march 2005 (see block diagram). selecting larger output and bypass capacitors allows additional time for the error amplifier and reference to turn on and prevent overshoot. to ensure that no overshoot is present when starting up into a light load (100 a), use a 4.7 f output capacitance and 470pf bypass capacitance. this slows the turn-on enough to allow the regulator to react and keep the output voltage from exceeding its nominal value. at heavier loads, use a 10 f output capacitance and 470pf bypass capacitance. lower values of output and bypass capacitance can be used, depending on the sensitivity of the system. applications that can withstand some overshoot on the output of the regulator can reduce the output capacitor and/ or reduce or eliminate the bypass capacitor. applications that are not sensitive to overshoot due to power-on reset delays can use normal output and bypass capacitor configurations. please note the junction temperature range of the regulator at 1.8v output (fixed and adjustable) is 0?c to +125?c. fixed regulator applications 15 2 3 4 2.2f 470pf v out mic5207-x.xbm5 v in figure 1. ultra-low-noise fixed voltage regulator figure 1 includes a 470pf capacitor for ultra-low-noise op- eration and shows en (pin 3) connected to in (pin 1) for an application where enable/shutdown is not required. c out = 2.2 f minimum. 15 2 34 1.0f enable shutdown en v out mic5207-x.xbm5 v in figure 2. low-noise fixed voltage regulator figure 2 is an example of a basic low-noise configuration. c out = 1 f minimum. adjustable regulator applications the mic5207bm5 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: vv1 r2 r1 , v 1.242v out ref ref =+ ? ? ? ? ? ? = 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; therefore, their equations are different from the equation for the mic5207bm5. 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 mic5207bm5 r1 r2 v in figure 3. ultra-low-noise adjustable voltage regulator 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. usb application figure 4 shows the mic5207-3.3bz (3-terminal, to-92) in a usb application. since the v bus supply may be greater than 10 inches from the regulator, a 1 f input capacitor is in- cluded. v bus d+ dC gnd usb port data en out flg in on/off overcurrent mic2525 usb controller gnd out in v cc 5.0v 0.1f 10k mic5207-3.3bz in out gnd upstream v bus 100ma max. ferrite beads 150f v bus d+ dC gnd data 1f 1f figure 4. single-port self-powered hub
mic5207 micrel, inc. march 2005 9 mic5207 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) tsot-23-5 (d5)
mic5207 micrel, inc. mic5207 10 march 2005 3 2 1 10 typ. 5 typ. 5 typ. 0.185 (4.699) 0.175 (4.445) 0.185 (4.699) 0.175 (4.445) 0.085 (2.159) diam. 0.500 (12.70) min. 0.090 (2.286) typ. 0.0155 (0.3937) 0.0145 (0.3683) seating plane 0.025 (0.635) max uncontrolled lead diameter 0.016 (0.406) 0.014 (0.356) 0.105 (2.667) 0.095 (2.413) 0.055 (1.397) 0.045 (1.143) 0.090 (2.286) radius, typ. 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143) bottom view to-92 (z) 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 this information furnished by micrel in this data sheet is believed 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 authorized for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intend ed 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 significant inj ury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchaser a grees to fully indemnify micrel for any damages resulting from such use or sale. ? 2001 micrel incorporated
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