1997 1 mic5208 mic5208 micrel mic5208 dual 50ma ldo regulator final information general description the mic5208 is a dual linear voltage regulator with very low dropout voltage (typically 20mv at light loads and 250mv at 50ma), very low ground current (225 a at 10ma output), and better than 3% initial accuracy. it also features individual logic-compatible enable/shutdown control inputs. designed especially for hand-held battery powered devices, the mic5208 can be switched by a cmos or ttl compatible logic signal, or the enable pin can be connected to the supply input for 3-terminal operation. when disabled, power con- sumption drops nearly to zero. dropout ground current is minimized to prolong battery life. key features include current limiting, overtemperature shut- down, and protection against reversed battery. the mic5208 is available in 3.0v, 3.3v, 3.6v, 4.0v and 5.0v fixed voltage configurations. other voltages are available; contact micrel for details. features micrel mini 8 msop package guaranteed 50ma output low quiescent current low dropout voltage wide selection of output voltages tight load and line regulation low temperature coefficient current and thermal limiting reversed input polarity protection zero off-mode current logic-controlled electronic enable 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 1 2 3 4 8 7 6 5 output a mic5208 1f enable may be connected to v in enable a enable b 1f output b typical application ordering information part number voltage accuracy junction temp. range* package mic5208-3.0bmm 3.0 3% 40 c to +125 c 8-lead msop mic5208-3.3bmm 3.3 3% 40 c to +125 c 8-lead msop mic5208-3.6bmm 3.6 3% 40 c to +125 c 8-lead msop mic5208-4.0bmm 4.0 3% 40 c to +125 c 8-lead msop mic5208-5.0bmm 5.0 3% 40 c to +125 c 8-lead msop other voltages available. contact micrel for details. 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
mic5208 2 1997 mic5208 micrel pin configuration 1 2 3 4 8 7 6 5 ina ena inb enb outa gnd outb gnd mic5208bmm pin description pin number pin name pin function 1 outa regulator output a 2, 4 gnd ground: both pins must be connected together. 3 outb regulator output b 5 enb enable/shutdown b (input): cmos compatible input. logic high = enable, logic low or open = shutdown. do not leave floating. 6 inb supply input b 7 ena enable/shutdown a (input): cmos compatible input. logic high = enable, logic low or open = shutdown. do not leave floating. 8 ina supply input a
1997 3 mic5208 mic5208 micrel absolute maximum ratings supply input voltage (v in ) ............................ 20v to +20v enable input voltage (v en ) ........................... 20v to +20v power dissipation (p d ) ............................ internally limited storage temperature range ................... 60 c to +150 c lead temperature (soldering, 5 sec.) ....................... 260 c electrical characteristics v in = v out + 1v; i l = 1ma; c l = 1 f, and v en 2.0v; t j = 25 c, bold values indicate 40 c to +125 c; for one-half of dual mic5208; unless noted. symbol parameter conditions min typical max units v o output voltage variation from nominal v out 33% accuracy ? 4 % ? v o / ? t output voltage note 2 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 3 0.08 0.3 % 0.5 % v in v o dropout voltage, note 4 i l = 100 a20mv i l = 20ma 200 350 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 (enabled), i l = 100 a 180 a note 5 i l = 20ma 225 750 a i l = 50ma 850 1200 a i gnddo ground pin current at dropout v in = 0.5v less than designed v out , note 5 200 300 a i limit current limit v out = 0v 180 250 ma ? v o / ? p d thermal regulation note 6 0.05 %/w control input input voltage level v il logic low shutdown 0.6 v v ih logic high enabled 2.0 v i il control input current v il 0.6v 0.01 1 a i ih v ih 2.0v 15 50 a general note: devices are esd protected, however, handling precautions are recommended. note 1: absolute maximum ratings indicate limits beyond which damage to the component may occur. electrical specifications do not appl y when operating the device outside of its rated operating conditions. the maximum allowable power dissipation is a function of the m aximum 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) t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. ja of the 8-lead msop is 200 c/w, mounted on a pc board. 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. changes in output voltage due to h eating 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 supp ly 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 50ma load pulse at v in = 16v for t = 10ms. recommended operating conditions supply input voltage (v in ) ............................... 2.5v to 16v enable input voltage (v en ) ................................. 0v to 16v junction temperature (t j ) ....................... 40 c to +125 c 8-lead msop ( ja ) ................................................... note 1
mic5208 4 1997 mic5208 micrel 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 (mic5208-3.3) 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 -60 -40 -20 0 20 40 60 ? output (mv) -50 0 50 100 -2 0 2 4 6 8 10 12 14 16 load (ma) time (ms) thermal regulation (mic5208-3.3) c l = 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 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
1997 5 mic5208 mic5208 micrel typical characteristics 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 -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 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 -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 (mic5208-3.3) c l = 1 f i l = 1ma -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 (mic5208-3.3) c l = 1 f 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 voltage vs. frequency i l = 50ma c l = 1 f v in = v out + 1 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 -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 (mic5208-3.3) c l = 11 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 = 1ma c l = 1 f v in = v out + 1 -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 (mic5208-3.3) c l = 1 f i l = 100 a
mic5208 6 1997 mic5208 micrel no-load stability the mic5208 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 mic5208, however, an overtemperature condition in one half may affect the other half because of proximity. thermal considerations multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. the mic5208-xxbmm (8-lead msop) has a thermal resis- tance of 200 c/w when mounted on a fr4 board with minimum trace widths and no ground plane. pc board ja dielectric fr4 200 c msop thermal characteristics for additional heat sink characteristics, please refer to micrel application hint 17, calculating p.c. board heat sink area for surface mount packages . applications information supply/ground both mic5208 gnd pins must be connected to the same ground potential. ina and inb can each be connected to a different supply. enable/shutdown ena (enable/shutdown) and enb may be enabled sepa- rately. forcing ena/b high (> 2v) enables the associated regulator. ena/b requires a small amount of current, typically 15 a. while the logic threshold is ttl/cmos compatible, ena/b may be forced as high as 20v, independent of v in . 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 ac filter capacitor or if a battery is used as the input. output capacitor an output capacitor is required between out and gnd to prevent oscillation. larger values improve the regulator s transient response. the output capacitor value may be in- creased without limit. the output capacitor should have an esr (effective series resistance) of about 5 ? or less and a resonant frequency above 500khz. most tantalum or aluminum electrolytic ca- pacitors are adequate; film types will work, but are more expensive. since many aluminum electrolytics have electro- lytes that freeze at about 30 c, solid tantalums are recom- mended for operation below 25 c. at lower values of output current, less output capacitance is required for output stability. the capacitor can be reduced to 0.22 f for current below 10ma or 0.1 f for currents below 1ma.
1997 7 mic5208 mic5208 micrel package information 0.008 (0.20) 0.004 (0.10) 0.039 (0.99) 0.035 (0.89) 0.021 (0.53) 0.012 (0.03) r 0.0256 (0.65) typ 0.012 (0.30) r 5 max 0 min 0.122 (3.10) 0.112 (2.84) 0.120 (3.05) 0.116 (2.95) 0.012 (0.03) 0.007 (0.18) 0.005 (0.13) 0.043 (1.09) 0.038 (0.97) 0.036 (0.90) 0.032 (0.81) dimensions: inch (mm) 0.199 (5.05) 0.187 (4.74) 8-pin msop (mm)
mic5208 8 1997 mic5208 micrel 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. ? 1997 micrel incorporated
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