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november 2000 1 mic5211 mic5211 micrel general descriptionthe mic5211 is a dual cap 80ma linear voltage regulator with very low dropout voltage (typically 20mv at light loads),very low ground current (225 a at 20ma output current), and better than 3% initial accuracy. this dual device comes in theminiature sot-23-6 package, featuring independent logic control inputs. the cap regulator design is optimized to work with low- value, low-cost ceramic capacitors. the outputs typicallyrequire only 0.1 f of output capacitance for stability. designed especially for hand-held, battery-powered devices,ground current is minimized using micrels proprietary super ?eta pnp? technology to prolong battery life. when dis- abled, power consumption drops nearly to zero. key features include sot-23-6 packaging, current limiting, overtemperature shutdown, and protection against reversed battery conditions. the mic5211 is available in dual 1.8v, 2.5v, 2.7v, 2.8v, 3.0v, 3.3v, 3.6v, and 5.0v versions. certain mixed voltages are also available. contact micrel for other voltages. typical application 162 3 4 0.1f 0.1f enable shutdown enable b v outa mic5211 v in 5 enable shutdown enable a v outb features? stable with low-value ceramic or tantalum capacitors ? independent logic controls ? low quiescent current ? low dropout voltage ? mixed voltages available ? tight load and line regulation ? low temperature coefficient ? current and thermal limiting ? reversed input polarity protection ? zero off-mode current ? dual regulator in tiny sot-23 package ? 2.5v to 16v input range applications? cellular telephones ? laptop, notebook, and palmtop computers ? battery-powered equipment ? bar code scanners ? smps post regulator/dc-to-dc modules ? high-efficiency linear power supplies ordering information part number marking voltage junction temp. range package mic5211-1.8bm6 lfbb 1.8v 0 c to +125 c sot-23-6 mic5211-2.5bm6 lfcc 2.5v C40 c to +125 c sot-23-6 mic5211-2.7bm6 lfdd 2.7v C40 c to +125 c sot-23-6 mic5211-2.8bm6 lfee 2.8v C40 c to +125 c sot-23-6 mic5211-3.0bm6 lfgg 3.0v C40 c to +125 c sot-23-6 mic5211-3.3bm6 lfll 3.3v C40 c to +125 c sot-23-6 mic5211-3.6bm6 lfqq 3.6v C40 c to +125 c sot-23-6 mic5211-5.0bm6 lfxx 5.0v C40 c to +125 c sot-23-6 dual-voltage regulators mic5211-1.8/2.5bm6 lfbc 1.8v/2.5v 0 c to +125 c sot-23-6 mic5211-1.8/3.3bm6 lfbl 1.8v/3.3v 0 c to +125 c sot-23-6 mic5211-2.5/3.3bm6 lfcl 2.5v/3.3v C40 c to +125 c sot-23-6 mic5211-3.3/5.0bm6 lflx 3.3v/5.0v C40 c to +125 c sot-23-6 other voltages available. contact micrel for details. mic5211 dual cap 80ma ldo regulator final information 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 downloaded from: http:///
mic5211 micrel mic5211 2 november 2000 pin configuration ena gnd outb enb 13 4 6 outa lfxx partidentification 5 in regulator a voltage code (v outa ) regulator b voltage code (v outb ) 2 pin 1 index egatlo ve doc v8. 1b v5. 2c v7. 2d v8. 2e v 3g v51. 3h v3. 3l v6. 3q v 5x pin description pin number pin name pin function 1 ena enable/shutdown a (input): cmos compatible input. logic high = enable, logic low or open = shutdown. 2 gnd ground 3 enb enable/shutdown b (input): cmos compatible input. logic high = enable, logic low or open = shutdown. 4 outb regulator output b 5 in supply input 6 outa regulator output a downloaded from: http:///
november 2000 3 mic5211 mic5211 micrel 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 storage temperature range ................... C60 c to +150 c lead temperature (soldering, 5 sec.) ....................... 260 c esd, (note 3) ..................................................................... electrical characteristicsv in = v out + 1v; i l = 1ma; c l = 0.1 f, and v en 2.0v; t j = 25 c, bold values indicate C40 c to +125 c; for one-half of dual mic5211; unless noted. symbol parameter conditions min typical max units v o output voltage variation from nominal v out C 33 % accuracy C 44 % ? v o / ? t output voltage note 5 50 200 ppm/ c temperature coeffcient ? v o /v o line regulation v in = v out +1v to 16v 0.008 0.3 % 0.5 % ? v o /v o load regulation i l = 0.1ma to 50ma, note 6 0.08 0.3 % 0.5 % v in C v o dropout voltage, note 7 i l = 100 a2 0 m v i l = 20ma 200 450 mv i l = 50ma 250 500 mv i q quiescent current v en 0.4v (shutdown) 0.01 10 a i gnd ground pin current v en 2.0v, i l = 100 a (active) 90 a note 8 i l = 20ma (active) 225 450 a i l = 50ma (active) 750 1200 a i limit current limit v out = 0v 140 250 ma ? v o / ? p d thermal regulation note 9 0.05 %/w enable input enable input voltage level v il logic low (off) 0.6 v v ih logic high (on) 2.0 v i il enable input current v il 0.6v 0.01 1 a i ih v ih 2.0v 3 50 a note 1: exceeding the absolute maximum rating may damage the device. note 2: the device is not guareented to function outside itsperating rating. note 3: devices are esd sensitive. handling precautions recommended. note 4: 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 is 220 c/w for the sot-23-6 mounted on a printed circuit board. note 5: output voltage temperature coeffiecient is defined as the worst case voltage change divided by the total temperature range. note 6: regulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulation in the load range from 0.1ma to 50ma. change in output voltage due to heating effects are covered by thermal regulation specification. note 7: dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential. for output voltages below 2.5v, dropout voltage is the input-to-output voltage differential with the minimum voltage being 2.5v. minimum input opertating voltage is 2.5v. note 8: ground pin current is the quiescent current per regulator plus pass transistor base current. the total current drawn from the supply is the sum of the load current plus the ground pin current. note 9: 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 50ma load pulse at v in = 16v for t = 10ms. operating ratings (note 2)supply input voltage (v in ) ............................... 2.5v to 16v enable input voltage (v en ) ................................. 0v to 16v junction temperature (t j ) (except 1.8v) . C40 c to +125 c 1.8v only .................................................. 0 c to +125 c 6-lead sot-23-6 ( ja ) .............................................. note 4 downloaded from: http:///
mic5211 micrel mic5211 4 november 2000 1 10 100 1000 0.01 0.1 1 10 100 dropout voltage (v) output current (ma) dropout voltage vs. output current c in = 10 f c out = 1 f 0 100 200 300 400 -60 -30 0 30 60 90 120 150 dropout voltage (mv) temperature ( c) dropout voltage vs. temperature c in = 10 f c out = 1 f i l = 100 a i l = 1ma i l = 50ma 0 1 2 3 4 01234567 output voltage (v) supply voltage (v) dropout characteristics (mic5211-3.3) i l = 50ma i l = 100 a c in = 10 f c out = 1 f 0 500 1000 1500 2000 0 1020304050607080 ground current ( a) output current (ma) ground current vs. output current v in = v out + 1v 0.0 0.5 1.0 1.5 2.0 01234567 ground current (ma) supply voltage (v) ground current vs. supply voltage i l = 50ma i l = 100 a v out = 3.3v 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -60 -30 0 30 60 90 120 150 ground current (ma) temperature ( c) ground current vs. temperature i l = 50ma i l = 100 a c in = 10 f c out = 1 f typical characteristics 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 50 100 150 200 output voltage (v) output current (ma) c in = 10 f c out = 1 f output voltage vs. output current 0 20 40 60 80 100 120 140 160 01234567 short circuit current (ma) input voltage (v) short circuit current vs. input voltage c in = 10 f c out = 1 f 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 -60 -30 0 30 60 90 120 150 output voltage (v) temperature ( c) output voltage vs. temperature c in = 10 f c out = 1 f curves applicable at 100 a and 50ma 3 devices hi / avg / lo 100 120 140 160 180 200 -60 -30 0 30 60 90 120 150 output current (ma) temperature ( c) short circuit current vs. temperature c in = 10 f c out = 1 f downloaded from: http:///
november 2000 5 mic5211 mic5211 micrel -400 -200 0 200 ? output (mv) -50 0 50 100 -1 012345678 output (ma) time (ms) load transient c out = 1 f v in = v out + 1 -50 0 50 100 -5 0 5 10 15 20 output (ma) time (ms) -200 -100 0 100 ? output (mv) load transient c out = 10 f v in = v out + 1 -2 -1 0 1 2 3 ? output (v) 2 4 6 8 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 input (v) time (ms) line transient (mic5211-3.3) c l = 1 f 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 voltage vs. frequency i l = 100 a c l = 1 f v in = v out + 1 0 20 40 60 80 100 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 ripple voltage (db) frequency (hz) ripple voltage vs. frequency i l = 1ma c l = 1 f v in = v out + 1 0 20 40 60 80 100 10x10 0 100x10 0 1x10 3 10x10 3 100x10 3 1x10 6 ripple voltage (db) frequency (hz) ripple voltage vs. frequency i l = 50ma c l = 1 f v in = v out + 1 -1 0 1 2 ? output (v) 2 4 6 8 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 input (v) time (ms) line transient (mic5211-3.3) c l = 11 f i l = 1ma downloaded from: http:///
mic5211 micrel mic5211 6 november 2000 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 = 50ma 3.3 3.4 3.5 -60 -30 0 30 60 90 120 150 min. supply voltage (v) temperature ( c) minimum supply voltage vs. temperature i l = 1ma v out = 3.3v c in = 10 f c out = 1 f -1.0 0.0 1.0 2.0 3.0 4.0 output (v) -2 0 2 4 -2 0246810 enable (v) time ( s) enable characteristics (mic5211-3.3) c l = 1 f i l = 100 a -1 0 1 2 3 4 5 output (v) -2 0 2 4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 enable (v) time (ms) enable characteristics (mic5211-3.3) c l = 1 f i l = 100 a 0.50 0.75 1.00 1.25 1.50 -60 -30 0 30 60 90 120 150 enable voltage (mv) temperature ( c) enable voltage vs. temperature c in = 10 f c out = 1 f i l = 1ma v on v off 0 10 20 30 40 -60 -30 0 30 60 90 120 150 enable current ( a) temperature ( c) enable current vs. temperature c in = 10 f c out = 1 f i l = 1ma v en = 5v v en = 2v crosstalk characteristic i outb = 100 a c outb = 0.47 f c outa = 0.47 f time (25ms/div.) i outa (50ma/div.) v outa (50mv/div.) v outb (50mv/div.) downloaded from: http:///
november 2000 7 mic5211 mic5211 micrel applications information enable/shutdown ena and enb (enable/shutdown) may be controlled sepa- rately. forcing ena/b high (>2v) enables the regulator. the enable inputs typically draw only 15 a. while the logic threshold is ttl/cmos compatible, ena/bmay be forced as high as 20v, independent of v in . ena/b may be connected to the supply if the function is not required.input capacitor a 0.1 f capacitor should be placed from in to gnd if there is more than 10 inches of wire between the input and the acfilter capacitor or when a battery is used as the input. output capacitor typical pnp based regulators require an output capacitor to prevent oscillation. the mic5211 is ultrastable, requiring only 0.1 f of output capacitance per regulator for stability. the regulator is stable with all types of capacitors, including thetiny, low-esr ceramic chip capacitors. the output capacitor value can be increased without limit to improve transient response. the capacitor should have a resonant frequency above 500khz. ceramic capacitors work, but some dielectrics have poor temperature coefficients, which will affect the value of the output capacitor over temperature. tantalum capacitors are much more stable over temperature, but typically are larger and more expensive. aluminum electrolytic capacitors will also work, but they have electrolytes that freeze at about C30 c. tantalum or ceramic capacitors are recommended for operation below C25 c. no-load stabilitythe mic5211 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 shutdown thermal shutdown is independent on both halves of the dual mic5211, however, an overtemperature condition in one half may affect the other half because of proximity. thermal considerations when designing with a dual low-dropout regulator, both sections must be considered for proper operation. the part is designed with thermal shutdown, therefore, the maximum junction temperature must not be exceeded. since the dual regulators share the same substrate, the total power dissipa- tion must be considered to avoid thermal shutdown. simple thermal calculations based on the power dissipation of both regulators will allow the user to determine the conditions for proper operation. the maximum power dissipation for the total regulator sys- tem can be determined using the operating temperatures and the thermal resistance of the package. in a minimum footprint configuration, the sot-23-6 junction-to-ambient thermal re- sistance ( ja ) is 220 c/w. since the maximum junction temperature for this device is 125 c, at an operating tem- perature of 25 c the maximum power dissipation is: p tt d(max) j(max) a ja = ? p 125 c 25 c 220 c/w d(max) = ? p 455mw d(max) = the mic5211-3.0 can supply 3v to two different loads inde-pendently from the same supply voltage. if one of the regu- lators is supplying 50ma at 3v from an input voltage of 4v, the total power dissipation in this portion of the regulator is: pvvi vi d1 in out out in gnd =? () +? p 4v 3v 50ma 4v 0.85ma d1 =? () +? p 53.4mw d1 = up to approximately 400mw can be dissipated by the remain-ing regulator (455mw C 53.4mw) before reaching the ther- mal shutdown temperature, allowing up to 50ma of current. pvvi vi d2 in out out in gnd =? () +? p 4v 3v 50ma 4v 0.85ma d2 =? () +? p 53.4mw d2 = the total power dissipation is: p p 53.4mw 53.4mw d1 d2 += + p p 106.8mw d1 d2 += therefore, with a supply voltage of 4v, both outputs canoperate safely at room temperature and full load (50ma). mic5211 in outa gnd v in ena outb 1f v outa enb v outb 1f figure 1. thermal conditions circuit in many applications, the ambient temperature is muchhigher. by recalculating the maximum power dissipation at 70 c ambient, it can be determined if both outputs can supply full load when powered by a 4v supply. p tt d(max) j(max) a ja = ? p 125 c 70 c 220 c/w d(max) = ? p 250mw d(max) = at 70 c, the device can provide 250mw of power dissipation, suitable for the above application.when using supply voltages higher than 4v, do not exceed the maximum power dissipation for the device. if the device downloaded from: http:///
mic5211 micrel mic5211 8 november 2000 is operating from a 7.2v-nominal two-cell lithium-ion batteryand both regulators are dropping the voltage to 3.0v, then output current will be limited at higher ambient temperatures. for example, at 70 c ambient the first regulator can supply 3.0v at 50ma output from a 7.2v supply; however, thesecond regulator will have limitations on output current to avoid thermal shutdown. the dissipation of the first regulator is: p 7.2v 3v 50ma 7.2v 0.85ma d1 =? () +? p 216mw d1 = since maximum power dissipation for the dual regulator is250mw at 70 c, the second regulator can only dissipate up to 34mw without going into thermal shutdown. the amountof current the second regulator can supply is: p 34mw d2(max) = 7.2v 3v i 34mw out2(max) ? () = 4.2v i 34mw out2(max) ?= i8 m a out2(max) = the second regulator can provide up to 8ma output current,suitable for the keep-alive circuitry often required in hand- held applications. refer to application hint 17 for heat sink requirements when higher power dissipation capability is needed. refer to de- signing with low dropout voltage regulators for a more thorough discussion of regulator thermal characteristics.dual-voltage considerations for configurations where two different voltages are needed in the system, the mic5211 has the option of having two independent output voltages from the same input. for ex- ample, a 3.3v rail and a 5.0v rail can be supplied from the mic5211 for systems that require both voltages. important considerations must be taken to ensure proper functionalityof the part. the input voltage must be high enough for the 5v section to operate correctly, this will ensure the 3.3v section proper operation as well. both regulators live off of the same input voltage, therefore the amount of output current each regulator supplies may be limited thermally. the maximum power the mic5211 can dissipate at room temperature is 455mw, as shown in the thermal considerations section. if we assume 6v input voltage and 50ma of output current for the 3.3v section of theregulator, then the amount of output current the 5v section can provide can be calculated based on the power dissipa- tion. p d = (v gnd C v out ) i out + v gnd i gnd p d(3.3v) = (6v C 3.3v) 50ma + 6v 0.85ma p d(3.3v) = 140.1mw p d(max) = 455mw p d(max) C p d(3.3v) = p d(5v) p d(5v) = 455mw C 140.1mw p d(5v) = 314.9mw based on the power dissipation allowed for the 5v section,the amount of output current it can source is easily calculated. p d(5v) = 314.9mw 314.9mw = (6v C 5v) i max C 6v i gnd (i gnd typically adds less than 5% to the total power dissipa- tion and in this case can be ignored) 314.9mw = (6v C 5v) i max i max = 314.9ma i max exceeds the maximum current rating of the device. therefore, for this condition, the mic5211 can supply 50maof output current from each section of the regulator. downloaded from: http:///
november 2000 9 mic5211 mic5211 micrel package information 0.20 (0.008)0.09 (0.004) 0.60 (0.024)0.10 (0.004) 3.00 (0.118)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-23-6 (m6) downloaded from: http:///
mic5211 micrel mic5211 10 november 2000 downloaded from: http:///
november 2000 11 mic5211 mic5211 micrel downloaded from: http:///
mic5211 micrel mic5211 12 november 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 any 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 patent right of micrel inc. ? 2000 micrel incorporated downloaded from: http:///

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