bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com 100ma, cap, low dropout voltage regulator B5213 smallest sc70 pin connection ordering information package sc70-5 B5213-xx ?xx? voltage selection guide vout xx code 2.8v 28 3.3v 33 3.0v 3 v en logic high = enabled logic low = shutdown description the B5213 is a cap, low dropout voltage regulator with very low quiescent current, 220 a typical, at 80ma load. it also has very low dropout voltage, typically 20mv at light load and 330mv at 80ma. the B5213 provides up to 80ma and consumes a typical of 1 a in disable mode. the B5213 is optimized to work with low value, low cost ceramic capacitors. the output typically require only 0.47 f of output capacitance for stability. the enable pin can be tied to v in for easy device layout. the B5213 is designed for portable, battery powered equipment applicati ons with small space requirements. the B5213 is available in a space saving 5- pin sc70 package. performance is specified for the ? 40 c to + 125 c temperature range and is available in 2.8v, 3.0v and 3.3v fixed voltages. for other output voltage options, please contact bay linear. features ? output current 100ma ? space saving sc70 ? 2.8.0v, 3.3v and 3.0v versions ? very low quiescent current ? low dropout voltage ? very low temperature coefficient ? needs only 1 f for stability ? error flag warns of output dropout ? logic-controlled electronic shutdown ? pin-to-pin mic5213 applications ? battery powered systems ? portable instrumentation ? notebooks computers ? potable consumer equipment ? bar code scanner ? cellular phones bay linear inspire the linear power sc-70 (l5) top view gnd v en nc 3 2 1 4 5 v in v out sc-70 (l5) top view gnd v en nc 3 2 1 4 5 v in v out
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B5213 absolute maximum rating parameter power dissipation in ternally limited lead temperature ( soldering 5 seconds ) 260 c storage temperature range -65 c to +150 c operating junction temperature -40 c to +125 c input supply voltage 2.7v to 6v v en 0v to v in shutdown input voltage -0.3v to +30v package thermal resistance 478 c electrical characteristics unless otherwise specified, all limits guaranteed for t j = 25 c, v in = v out + 1v, i l = 1ma, c l = 0.47 f, v en 2.0v. boldface limits apply at the temperature extremes. parameter conditions min typ max unit output voltage -3 -4 3 4 % output voltage temperature coefficient (note 10) 50 200 ppm / c line regulation v in = v out +1v to 6v 0.008 0.3 % load regulation i l =0.1ma to 80ma (note 6) 0.08 0.3 0.5 % dropout voltage (note 7) i l = 100 a i l = 20ma i l = 50ma i l = 80ma 20 70 180 330 350 600 mv ground pin current i l = 100 a, v en 2.0v(active) i l = 20ma, v en 2.0v(active) i l = 500ma, v en 2.0v(active) i l = 80ma, v en 2.0v(active) 160 180 200 220 750 3000 a ground pin current at dropout v in =v out(nominal)- 0.5v note (8) 200 300 a quiescent current v en 0.4v(shutdown) 110 170 a current limit v out = 0 180 250 ma enable input thermal regulation (note 9) 0.05 % / w enable input voltage level v il , logic low (off) v ih , logic high (on) 2.0 0.6 a enable input current v en 0.4v v ih 2.0v 0.01 15 1 50 a
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B5213
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B5213 application hints the B5213 is a low dropout, linear regulator designed primarily for battery- powered applications. the B5213 can be used with low cost ceramic capacitors, typical value of 0.47 f. as illustrated in the simplified schematics, the B5213 consists of a 1.25v reference, error amplifier, p- channel pass transistor and internal feedback voltage diode. the 1.25v reference is connected to the input of the error amp. the error amp compares this reference with the feedback voltage. if the feedback voltage is lower than the reference, the pass transistor gate is pulled lower allowing more current to pass and increasing the output voltage. if the feedback voltage is too high, the pass transistor gate is pulled up allowing less current to pass to the output. the output voltage is feedback through the resistor divider. additional blocks include short circuit current protection and thermal protection. the B5213 features an 80ma p- channel mosfet transistor. this provides several advantages over similar designs using pnp pass transistors including longer battery life. the p- channel mosfet requires no base drive, which reduces quiescent current considerably. pnp based regulators waste considerable amounts of current in dropout when the pass transistor saturates. they also have high base drive currents under large loads. the B5213 does not suffer from these problems and consumes only the specified quiescent current under light and heavy loads. external capacitors like any low- dropout regulators, the B5213 requires external capacitors for regulator stability. the B5213 is specially designed for portable applications requiring minimum board space and the smallest components. a 0.1f capacitor shoul d be placed from v in to gnd if there is more than 10 inches of wire between the input and ac filter or when a battery is used as the input. this capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analog ground. the B5213 is designed to work with small ceramic output capacitors. ceramic capacitors ranging between 0.47 f to 4.7 f are the smallest and least expensive. no- load stability the B5213 will remain stable and in regulation with no- load (other than the internal voltage divider). this is especially important in cmos ram keep- alive applications. enable input the B5213 is shut off by pulling the ven pin below 0.6v; all internal circuitry is powered off and the quiescent current is typically 1 a. pulling the v en high above 2v re- enables the device and allows operation. if the shut down feature is not used, the v en pin should be tied to v in to keep the regulator output on all the time. thermal behavior the B5213 regulator has internal thermal shutdown to protect the device from over heating. under all operating conditions, the maximum junction temperature of the B5213 must be below 125 c. maximum power dissipation can be calculated based on the output current and the voltage drop across the part. the maximum power dissipation is p d( max) = ( t j( max) - t a )/ ja ja is the junction- to- ambient thermal resistance, 478 c/ w for the B5213 in the sc70 package. t a is the maximum ambient temperature t j( max) is the maximum junction temperature of the die, 125 c when operating the B5213 at room temperature, the maximum power dissipation is 209mw. the actual power dissipated by the regulator is pd = ( v in - v out ) i l + v in i gnd the figure below shows the voltage and currents, which are present in the circuit.
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com B5213 34 34 B5213 B5213 34
bay linear, inc 2418 armstrong street, livermore, ca 94550 tel: (925) 606-5950, fa x: (925) 940-9556 www.baylinear.com advance information - these data sheets contain descriptions of products that are in development. the specifications are based on the engineering ca lculations, computer simulations and/ or initial prototype evaluation. preliminary information - these data sheets contain minimum and maxi mum specifications that are based on the initial device characterizations. these lim its are subject to change upon the completion of the full characterization over the specif ied temperature and supply voltage ranges. the application circuit examples are only to explain the repres entative applications of the de vices and are not intended to gua rantee any circuit design or permit any industrial property ri ght to other rights to execute. bay linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the da ta book. typical parameters can and do vary in different applications. customer?s technical experts must validate all operating parameters including ? typical? for each customer applic ation. life support and nuclear policy bay linear products are not authorized fo r and should not be used within life suppor t systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications wi thout the specific written consent of bay linear president.
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