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sgm2122 dual, low dropout, 250ma ldo regulators general description the sgm2122 is a dual, low-power, low-dropout, cmos linear voltage regulator. it operates from a 2.5v to 5.5v input and delivers up to 250ma at each channel. the sgm2122 is the perfect choice for low voltage, low power. the ground current is 190 a (both ldo?s enabled and active) that makes this part attractive for battery operated power systems. the sgm2122 also offers low dropout voltage (250mv at 250ma output) to prolong battery life in portable electronics. separate enable pins control each individual ldo output. the en function allows the output of each regulator to be turned off independently, resulting in greatly reduced power consumption. other features include a 10na logic-controlled shutdown mode, foldback current limit and thermal shutdown protection. the sgm2122 is available in green sot-23-6 package. it operates over an ambient temperature range of -40 to +85 . applications cellular telephones cordless telephones pcs telephones pcmcia cards modems mp3 player hand-held instruments palmtop computers wireless lan portable/battery-powered equipment features ? highly accurate: 2% ? ultra-low dropout voltage: 250mv at 250ma output ? 190a no-load supply current ? quick auto-discharge in shutdown status ? thermal-overload protection ? output current limit ? 10na logic-controlled shutdown ? operating temperature range: -40 to +85 ? small package pin configuration (top view) sgm2122 out1 out2 sot-23-6 gnd en2 en1 in 3 2 1 6 5 4 syyxx note: the location of pin 1 on the sgm2122 is determined by orienting the package marking as shown. typical application circuit out2 out1 en1 gnd 1 f 1 f on off sgm2122 en2 in output1 output2 1 f on off input 1 2 34 5 6 rev. a. 4 sg micro corp www.sg-micro.com
dual, low dropout, 250ma ldo regulators 2 sgm2122 sg micro corp www.sg-micro.com package/ordering information ordering number v out1 v out2 pin- package specified temperature range package marking package option sgm2122-ayn6g/tr 2.8v 2.8v sot-23-6 -40 to +85 s0cxx tape and reel, 3000 sgm2122-cyn6g/tr 2.8v 3.0v sot-23-6 -40 to +85 s0dxx tape and reel, 3000 sgm2122-dyn6g/tr 2.8v 2.5v sot-23-6 -40 to +85 s0exx tape and reel, 3000 sgm2122-eyn6g/tr 2. 8v 1.8v sot-23-6 -40 to +85 s0fxx tape and reel, 3000 sgm2122-gyn6g/tr 2.5v 1.8v sot-23-6 -40 to +85 s10xx tape and reel, 3000 sgm2122-hyn6g/tr 3.3v 2.5v sot-23-6 -40 to +85 s11xx tape and reel, 3000 sgm2122-iyn6g/tr 3.3v 1.8v sot-23-6 -40 to +85 s12xx tape and reel, 3000 sgm2122-kyn6g/tr 3.0v 1.8v sot-23-6 -40 to +85 s13xx tape and reel, 3000 sgm2122-myn6g/tr 2.8v 1.2v sot-23-6 -40 to +85 s14xx tape and reel, 3000 sgm2122-nyn6g/tr 2.8v 1.3v sot-23-6 -40 to +85 s15xx tape and reel, 3000 sgm2122-oyn6g/tr 2.8v 1.5v sot-23-6 -40 to +85 s16xx tape and reel, 3000 sgm2122-pyn6g/tr 1. 5v 2.8v sot-23-6 -40 to +85 s17xx tape and reel, 3000 sgm2122-qyn6g/tr 2.5v 1.5v sot-23-6 -40 to +85 s18xx tape and reel, 3000 sgm2122-ryn6g/tr 2.5v 2.8v sot-23-6 -40 to +85 s19xx tape and reel, 3000 SGM2122-SYN6G/tr 1. 3v 2.8v sot-23-6 -40 to +85 s1axx tape and reel, 3000 sgm2122-tyn6g/tr 1. 5v 3.3v sot-23-6 -40 to +85 s1bxx tape and reel, 3000 sgm2122-uyn6g/tr 3.3v 3.0v sot-23-6 -40 to +85 s1cxx tape and reel, 3000 sgm2122-vyn6g/tr 1. 8v 3.3v sot-23-6 -40 to +85 s1dxx tape and reel, 3000 sgm2122-wyn6g/tr 1.2v 2.8v sot-23-6 -40 to +85 s1exx tape and reel, 3000 sgm2122-xyn6g/tr 3. 3v 2.8v sot-23-6 -40 to +85 s28xx tape and reel, 3000 sgm2122-yyn6g/tr 1. 8v 2.8v sot-23-6 -40 to +85 s29xx tape and reel, 3000 sgm2122-abyn6g/tr 1.8v 1.2v sot-23-6 -40 to +85 s42xx tape and reel, 3000 note: order number and package mark ing are defined as the follow: order number sgm2122- x x x g / tr operating temperature range output voltages package type green product tape and reel n6 sot-23-6 y -40 to +85 a : 2.8v (output1), 2.8v (output2) c : 2.8v (output1), 3.0v (output2) d : 2.8v (output1), 2.5v (output2) . . . . . . marking information for example: s0c9a (2009 year, the 1st month) syy x x year assembled ("9" = 2009, "a" = 2010 ) month assembled ("a" = jan. "b" = feb. "l" = dec.) identify the product
dual, low dropout, 250ma ldo regulators 3 sgm2122 sg micro corp www.sg-micro.com absolute maximum ratings in to gnd..................................................................-0.3v to 6v output short-circuit duration ..........................................infinite en to gnd...............................................................-0.3v to v in out to gnd...............................................-0.3v to (v in + 0.3v) power dissipation, p d @ t a = 25 sot-23-6 .........................................................................0.4w package thermal resistance sot-23-6, ja ............................................................. 310 /w operating temperature range........................-40 to +85 junction temperature.....................................................150 storage temperature range..........................-65 to +150 lead temperature (soldering, 10s)................................260 esd susceptibility hbm................................................................................4000v mm....................................................................................400v note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond thos e indicated in the operational sections of the specifications is not implied. exposure to absolute ma ximum rating conditions for extended periods may affect device rel iability. caution this integrated circuit can be damaged by esd if you don?t pay attention to esd protection. sgmicro recommends that all integrated circuits be handled with appropriate precautions. fa ilure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. sgmicro reserves the right to make any chang e in circuit design, specification or other related things if necessary without not ice at any time. please contact sgmicro sales office to get the latest datasheet. pin description pin name function 1 out2 channel2 output voltage. 2 gnd common ground. 3 en2 on/off control 2. a logic low reduces the supply current to 10na. 4 en1 on/off control 1. a logic low reduces the supply current to 10na. 5 in supply input. 6 out1 channel1 output voltage. note: if en1 and en2 are both low, both regulators and the reference turn off.
dual, low dropout, 250ma ldo regulators 4 sgm2122 sg micro corp www.sg-micro.com electrical characteristics (v in = v out (nominal) + 0.5v or 2.5v (whichever is greater), t a = -40 to +85 . typical values are at t a = +25 , for each ldo unless otherwise specified.) parameter symbol conditions min typ max units input voltage v in 2.5 5.5 v output voltage accuracy i out = 0.1ma, t a = +25 -2 +2 % maximum output current (3) 250 ma current limit i lim 310 500 ma ground pin current i q en = v in , both ldos no load 190 295 a i out = 1ma 1 dropout voltage (1) i out = 250ma 250 350 mv line regulation v lnr v in = 2.5v or (v out + 0.5v) to 5.5v, i out = 1ma 0.02 0.15 %/v load regulation v ldr i out = 0.1ma to 250ma, c out = 1f 0.004 0.01 %/ma power supply rejection rate psrr i load = 50ma, c out = 1f f = 100hz 71 db shutdown v ih 2.0 en input threshold v il v in = 2.5v to 5.5v 0.4 v t a = +25 0.01 1 en input bias current i b(shdn) en = 0v and en = 5.5v t a = +85 0.01 a t a = +25 0.01 1 shutdown supply current i q(shdn) en1 = en2 = 0.4v t a = +85 0.01 a shutdown exit delay (2) c out = 1f, no load t a = +25 20 s thermal protection thermal shutdown temperature t shdn 155 thermal shutdown hysteresis t shdn 20 notes: 1. the dropout voltage is defined as v in - v out , when v out is 100mv below the value of v out for v in = v out + 0.5v. (only applicable for v out = +2.5v to +3.3v) 2. time needed for v out to reach 95% of final value. 3. each channel provides 300ma of maximum output cu rrent when the condition of dissipating heat is good.
dual, low dropout, 250ma ldo regulators 5 sgm2122 sg micro corp www.sg-micro.com typical operating characteristics v in = v out (nominal) + 0.5v or 2.5v (whichever is greater), c in = 1 f, c out = 1 f, t a = +25 , unless otherwise noted. output voltage accuracy vs. temperature -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 -40 -15 10 35 60 85 temperature ( ) output voltage accuracy (%) output voltage vs. input voltage 0 1 2 3 4 5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) output voltage (v) no load v out = 1.8v v out = 2.8v sgm2122-e dropout voltage vs. load current 0 50 100 150 200 250 300 0 50 100 150 200 250 load current (ma) dropout voltage (mv) t a = -40 t a = +25 t a = +85 v out = 2.8v gr ound pi n current vs. t empera ture 150 165 180 195 210 225 240 -40 -15 10 35 6 0 85 temperature ( ) ground pi n cu rrent ( a ) no load sgm 212 2-e ground pin current vs. input voltage 0 40 80 120 160 200 240 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) ground pin current (a) no load sgm2122-e ground pin current vs. load current 100 150 200 250 300 350 400 0 50 100 150 200 250 load current (ma) ground pin current (a) both output loaded
dual, low dropout, 250ma ldo regulators 6 sgm2122 sg micro corp www.sg-micro.com typical operating characteristics v in = v out (nominal) + 0.5v or 2.5v (whichever is greater), c in = 1 f, c out = 1 f, t a = +25 , unless otherwise noted. power-supply rejection ratio vs. frequency 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 1000 frequency (khz) psrr (db) c out = 10 f i load = 50ma v in = v out +1v c out = 1 f
dual, low dropout, 250ma ldo regulators 7 sgm2122 sg micro corp www.sg-micro.com typical operating characteristics v in = v out (nominal) + 0.5v or 2.5v (whichever is greater), c in = 1 f, c out = 1 f, t a = +25 , unless otherwise noted. en input threshold vs. input voltage 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 3 3.2 3.4 3.6 3.8 4 4.2 input voltage (v) en input threshold (v) v ih v il
dual, low dropout, 250ma ldo regulators 8 sgm2122 sg micro corp www.sg-micro.com application note when ldo is used in handheld products, attention must be paid to voltage spikes which could damage sgm2122. in such applications, voltage spikes will be generated at charger interface and v bus pin of usb interface when charger adapters and usb equipments are hot-plugged. besides this, handheld products will be tested on the production line without battery. test engineer will apply power from the connecto r pin which connects with positive pole of the battery. when external power supply is turned on suddenly, the volt age spikes will be generated at the battery connector. the voltage spikes will be very high, and it always exceeds the absolute maximum input voltage (6.0v) of ldo. in order to get robust design, design engineer needs to clear up this voltage spike. zener diode is a cheap and effective solution to eliminate such voltage spike. for example, bzm55b5v6 is a 5.6v small package zener diode which can be used to remove voltage spikes in cell phone designs. the schematic is shown below. sgm2122 4.7f v out 1 2 5 vcc input en1 gnd in control 4 6 v out 1 c 2 c 1 1f bzm55b5v6 4.7f v out 2 1 v out 2 c 3 3 en2 control
dual, low dropout, 250ma ldo regulators 9 sgm2122 sg micro corp www.sg-micro.com package outline dimensions sot-23-6 e e1 e e1 b d a1 a2 a c l 0.2 2.59 0.99 0.95 0.69 recommended land pattern (unit: mm) dimensions in millimeters dimensions in inches symbol min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950 bsc 0.037 bsc e1 1.900 bsc 0.075 bsc l 0.300 0.600 0.012 0.024 0 8 0 8
dual, low dropout, 250ma ldo regulators 10 sgm2122 sg micro corp www.sg-micro.com tape and reel information note: the picture is only for reference. please make the object as the standard. key parameter list of tape and reel package type reel diameter reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p0 (mm) p1 (mm) p2 (mm) w (mm) pin1 quadrant sot-23-6 7 9.5 3.17 3.23 1.37 4.0 4.0 2.0 8.0 q3 reel width (w1) reel diameter reel dimensions tape dimensions direction of feed p2 p0 w p1 a0 k0 b0 q1 q2 q4 q3 q3 q4 q2 q1 q3 q4 q2 q1
dual, low dropout, 250ma ldo regulators 11 sgm2122 sg micro corp www.sg-micro.com carton box dimensions note: the picture is only for reference. please make the object as the standard. key parameter list of carton box reel type length (mm) width (mm) height (mm) pizza/carton 7 (option) 368 227 224 8 7 442 410 224 18

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