bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, fa x: (925) 940-9556 www.baylinear.com 300 ma cmos low dropout ldo b4300 pin connection ordering information package part no. sot-89 b4300cr-x.x sot-223 b4300cn-x.x x.x = fixed output voltages from 2.0v to 6.0v top view sot-89 (r) 1 2 3 vss vin vout 2 vin description the b4300 series are a group of positive output voltage, three-pin regulators, which pr ovide a high current even when the input/output voltage differential is small. low power consumption and high accuracy is achieved though cmos and programmable fuse technologies. output voltage: 2.0v to 6.0v in 0.1v increments. the b4300 consists of a high-precision voltage reference, an error correction circuit, and a current limited output driver. available in sot-89 (300mw), and sot-223 (500mw) packages minimizing the usage of board real state. features ? maximum output cu rrent: 300 ma. ? highly accurate: output voltage +/- 1.4% ? extremely low ground current 6 a ? cmos low power consumption. ? over-current & over-temp. protection ? small input/output differential: 0.3v @ 300ma 0.1v @ 100ma ? pin-to-pin replacement for tc1108 & xc6203 ? offered in sot-89 & sot-223 applications ? battery powered equipment ? notebook pc, palmtops, pda ? portable cameras and video recorders ? reference voltage sources top view sot-223 (n) 1 2 3 vss vin vout 2 vin bay linear inspire the linear power
bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, fa x: (925) 940-9556 www.baylinear.com b4300 absolute maximum ratings parameter symbol ratings units input voltage v in 6.5 v output current i out 300 ma output voltage v out v ss -0.3 to v in 0.3 v continual total power dissipation sot-89 sot-223 pd 300 500 mw operating ambient temperature t opr -30 to 80 c storage temperature t stg -40 to 125 c electrical characteristics (t a = 25 c, v in = v out + 0.5v; unless otherwise noted) parameter conditions min typ max unit i o = 0ma -1.4% - +1.4% output voltage i o = 0 to 300ma -2% - +2% v line regulation ? v out / ? v in - v out i o 100ma, (v out + 0.1v) bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, fa x: (925) 940-9556 www.baylinear.com b4300 product description the b4300 is precision fixed output voltage regulator. unlike bipolar regulators, the b4300 supply current does not increase with load current. in addition, v out remains stable and within regulator at very low load currents (an important consideration in rtc and cmos ram battery back-up application). figure 1 shows a typical application circuit. the regulator is enabled any time the shutdown input is at or above v ih. and shutdown (disabled) when shdn is at or below v il . shdn maybe controlled by a cmos logic gate, or i/o port of a micro controller. if the shdn input is not. required, it should be connected directly to the supply. while in shutdown, supply current decreases to 0.05 a (typical) and v out falls to zero volts. output capacitor a 1 f (min) capacitor from v out to ground is required. then output capacitor should have an effective series resistance of 5 ? or less. a 1 a capacitor should be connected from v in to gnd if there is more than 10 inches of wire between the regulator and the ac filter capacitor, or if a battery is used as the power source. aluminum electrolytic or tantalum capacitor types can be used. (since many alumi num electrolytic capacitors freeze at approximately- 30 c, solid tantalums are recommended for applications operating below ?25 c.) when operating from sources other than batteries, supply-noise rejection and transient response can be improved by increas ing the value of the input and output capacitors and employing passive filtering techniques. thermal considerations thermal shutdown integrated thermal protection circuitry shuts the regulator off when die temperature exceeds 160 c. the regulator remaining off until the die temperature drops to approximately 140 c. power dissipation the amount of power the regulator dissipates is primarily a function of input and output voltage, and output current. the following equation is used to calculate worst case power dissipation: p d =(v inmax -v outmin )i loadmax where: p d = worst case actual power dissipation v inmax = maximum voltage on v in v outmin =minimum regulator output voltage i loadmax = maximum output (load) current the maximum allowable power dissipation is function of the maximum ambient temperature (t amax ). the maximum allowable die temperature (125 c) and the thermal resistance from junction-to-air ( ja ). p dmax =(t jmax -t amax )/ ja where all terms are previously defined this can be caused in conjunction with other equation to ensure regulator thermal operation is within limit. for example: given: v inmax =3.3v+10% v outmin =2.7v-2.5% i loadmax =275 ma t jmax =125 c t amax =95 c ja = 59 c/w find: 1. actual power dissipation 2. maximum allowable dissipation battrey c 1 1 f v in gnd v out c 2 1 f b4300 battrey c 1 1 f v in gnd v out c 2 1 f b4300
bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, fa x: (925) 940-9556 www.baylinear.com b4300 a 1 2 3 p k f g d b style 1 pin 1. base 2. collector 3. emitter style 3 pin 1. gate 2. anode 3. cathode style 2 pin 1. anode 2. cathode 3. no connection pin 1. drain 2. gate 3. source style 4 millimeters inches dim min max min max a 4.40 4.60 0.174 0.181 b 2.29 2.60 0.091 0.102 c 140 160 0.056 0.062 d 0.36 0.48 0.015 0.018 e 1.62 1.80 0.064 0.070 f 0.44 0.53 0.018 0.020 g j 0.35 0.44 0.014 0.017 k 0.80 1.04 0.032 0.040 l 300 bsc 0.118 bsc n 2.04 2.28 0.081 0.089 p 3.94 4.25 0.156 0.167 150 bsc 0.059 bsc -t- n c j
bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, fa x: (925) 940-9556 www.baylinear.com b4300
bay linear, inc 2478 armstrong street, livermore, ca 94550 tel: (925) 989-7144, 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 maximum specifications th at are based on the initial devi ce 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 devices and are not intended to gua rantee any circuit design or permit any industrial property right 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.
|
