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aic1742 low noise, low quiescent current, 150ma linear regulator with noise bypass analog integrations corporation si-soft research center ds-1742g-01 20100121 3a1, no.1, li-hsin rd. i , science park , hsinchu 300, taiwan , r.o.c. tel: 886-3-5772500 fax: 886-3-5772510 www.analog.com.tw 1 ? features z very low noise, 25 v rms @ f=10~100khz. z very low quiescent current, 35 a. z very low dropout voltage, 90mv @ 50ma. z active low shutdown control. z short circuit and thermal protection. z 1.5v, 1.8v, 2.0v, 2.5v, 2.8v, 2.85v, 2.9v, 3.0v, 3.3v output voltage. z available in 2% output tolerance. z low profile package: sot-23-5 ? applications z cellular telephones. z pagers. z personal communication equipment. z cordless telephones. z portable instrumentation. z portable consumer equipment. z radio control systems. z low voltage systems. z battery powered systems ? description aic1742 is a low noise, low dropout linear regulator, and is housed in a small sot-23-5 package. the device is in the ?on? state when the shdn pin is set to logic high level. a low dropout voltage of 90mv at 50ma load current is performed. it offers high precision output voltage of 2%. the quality of low quiescent current and low dropout voltage makes this device ideal for battery power applications. the internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. the high ripple rejection and low noise of aic1742 provide enhanced performance for critical applications. the noise bypass pin can be connected an external capacitor to reduce the output noise level. ? typical application circuit c in 1 f v in bp vout shdn gnd vin aic1742 c out 2.2 f c bp 0.01 f v shdn v out low noise low dropout linear regulator * c in : taiyo yuden, cejmk107bj105ma-t *c out : taiyo yuden, cejmk107bj225m -t
aic1742 2 ? ordering information pin configuration a ic1742-xxx xxx xx packing type tr: tape & reel bg: bag c: commercial acv: sot-23-5 bcv: sot-23-5 p: lead free commerc ial apv: sot-23-5 bpv: sot-23-5 g: gree package agv: sot-23-5 bgv: sot-23-5 output voltage 15: 1.5v 18 : 1.8v 20: 2.0v 25: 2.5v 28: 2.8v 285: 2.85v 29: 2.9v 30: 3.0v 33: 3.3v (of a unit of 0.1v within the voltage range from 1.5v to 3.3v, additional voltage versions for this product line may be available on demand with prio r consultation with aic.) 32 1 4 5 sot-23-5 front view (axv ) 1. vin 2. gnd 3. shdn 4. bp 5. vout (bxv ) 1. vout 2. gnd 3. vin 4. shdn 5. bp
aic1742 3 ? sot-23-5 marking part no. acv apv agv part no. bcv bpv bgv aic1742-15axv er15 er15p er15g AIC1742-15BXV es15 es15p es15g aic1742-18axv er18 er18p er18g aic1742-18bxv es18 es18p es18g aic1742-20axv er20 er20p er20g aic1742-20bxv es20 es20p es20g aic1742-25axv er25 er25p er25g aic1742-25bxv es25 es25p es25g aic1742-28axv er28 er28p er28g aic1742-28bxv es28 es28p es28g aic1742-285axv er2j er2jp er2j g aic1742-285bxv es2j es2jp es2jg aic1742-29axv er29 er29p er29g aic1742-29bxv es29 es29p es29g aic1742-30axv er30 er30p er30g aic1742-30bxv es30 es30p es30g aic1742-33axv er33 er33p er33g aic1742-33bxv es33 es33p es33g ? absolute maximum ratings supply voltage 9v shutdown terminal voltage .9v power dissipation 500mw operating temperature range -40oc~85oc maximum junction temperature 125 c storage temperature range -65oc~150oc lead temperature (soldering, 10 sec) 260 c thermal resistance junction to case 130oc/w thermal resistance junction to ambient 220oc/w (assume no ambient airflow, no heatsink) absolute maximum ratings are those values beyond which the life of a device may be impaired. ? test circuit refer to typical application circuit
aic1742 4 ? electrical characteristics (t j =25 c, unless otherwise specified) (note1) parameter test conditions symbol min. typ. max. unit quiescent current v in = v out + 1v, v shdn =1.6v, i out = 0ma i q 35 45 a standby current v in = v out + 1v to 8v, v shdn =0.6v, output off i stby 0.1 a gnd pin current i out = 50ma i gnd 2.5 3.5 ma continuous output current v in = v out + 1v to 8v i out 150 ma output current limit v in = v out + 1v, v out = 0v i il 150 250 ma output voltage tolerance v in = v out + 1v, no load v out -2 2 % temperature coefficient t c 50 150 ppm/oc line regulation v in = v out typ + 1v to 8v v lir 2 5 mv load regulation v in = 5v, i out = 0.1~150ma v lor 0.005 0.01 %/ma dropout voltage i out = 50 ma vout 2.5v v drop 90 160 mv i out = 100 ma 140 230 i out = 150 ma 200 350 i out = 150 ma vout<2.5v 500 800 noise bypass terminal voltage v ref 1.25 v ripple rejection f=1khz, ripple=0.5v p-p , c bp = 0.1 f rr 65 db output noise c bp = 0.1 f, f = 10~100khz n 25 vrms shutdown terminal specifications shutdown pin current v shdn =1.6v i shdn 2 a shutdown pin voltage (on) output on v shdn on 1.6 v shutdown pin voltage (off) output off v shdn off 0.6 v shutdown exit delay time c bp = 0.1 f, c out = 1 f, i out =30ma t 300 s note 1: specifications are production tested at ta=25 c. specifications over the -40 c to 85 c operating temperature range are assured by design, charac terization and correlation with statistical quality controls (sqc). note 2: the dropout voltage is defined as v in ? v out when v out is 1% below the value of v out for v in = v out + 0.5v. (only applicable for v out = 2.5v ~ 5v)
aic1742 5 ? typical performance characteristics 2 3 4 5 6 7 8 9 10 0 10 20 30 40 50 60 fig. 1 quiescent current quiescent current ( a) input voltage (v) a ic1742 t a =25 c v shdn =1.6v i out =0ma fig. 2 ground current ground current (ma) 0 20 40 60 80 100 120 140 0 2 4 6 8 10 12 14 output current (ma) t a =25 c a ic1742 fig. 3 short-circuit current short-circuit current ( ma ) 0 1 2 3 4 5 6 7 0 50 100 150 200 250 300 350 input voltage (v) a ic1742 t=25 c fig. 4 output voltage output voltage deviation (%) -40 -20 0 20 40 60 80 100 120 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 a ic1742-33 a ic1742-15 temperature ( c) v in =5v v shdn =1.6v i out =0ma fig. 5 load regulation load regulation (mv) 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 0 5 10 15 20 25 30 35 a ic1742-33 a ic1742-15 output current (ma) a ic1742 v in =5v v shdn =1.6v t a =25 c load regulation (mv) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 10 20 30 40 50 i out =100ma i out =150ma fig. 6 load regulation input voltage (v) a ic1742-15 v shdn =1.6v t a =25 c
aic1742 6 ? typical performance characteristics (continued) fig. 7 load regulation load regulation (mv) 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 16 18 20 22 24 26 28 30 32 34 i out =100ma input voltage (v) v shdn =1.6v t a =25 c i out =150ma a ic1742-33 dropout voltage (mv) fig. 8 dropout voltage 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 0 50 100 150 200 250 300 out p ut current ( ma ) t a =25 c a ic1742-25 dropout voltage (mv) fig. 9 dropout voltage out p ut current ( ma ) 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 0 100 200 300 400 500 600 700 800 t a =25 c a ic1742-20 ripple rejection (db) fig. 10 input ripple rejection 10 10 2 10 3 10 4 10 5 10 6 0 20 40 60 80 100 c out =2.2 f ceramic i out =0ma c bp =0.1 f frequency (hz) c bp =0.01 f a ic1742-20 ripple rejection (db) fig. 11 input ripple rejection 0 20 40 60 80 100 frequency (hz) c out =2.2 f ceramic i out =0ma c bp =0.1 f c bp =0.01 f a ic1742-30 10 10 2 10 3 10 4 10 5 10 6 ripple rejection (db) fig. 12 input ripple rejection frequency (hz) 0 20 40 60 80 100 c out =2.2 f ceramic i out =100ma c bp =0.01 f c bp =0.1 f aic1742-20 10 10 2 10 3 10 4 10 5 10 6
aic1742 7 ? typical performance characteristics (continued) ripple rejection (db) fig. 13 input ripple rejection frequency (hz) 10 10 2 10 3 10 4 10 5 10 6 0 20 40 60 80 100 c out =2.2 f ceramic i out =100ma c bp =0.01 f c bp =0.1 f a ic1742-30 fig. 14 shutdown delay v shdn , 2v/div v out , 1v/div 1 2 1) ch 1: 500 mvolt 25 us 2) ch 2: 20 mvolt 25 us fig. 15 line transient response vout, 20mv/div vin, 500mv/div v in =3.5~4.5v v out =2.5v c out =2.2 f ceramic i out =60ma 1 2 1) ch 1: 500 mvolt 100 us 2) ch 2: 20 mvolt 100 us fig. 16 line transient response vout, 20mv/div vin, 500mv/div v in =4.5~3.5v v out =2.5v c out =2.2 f ceramic i out =60ma 1 2 > 1) ch 1: 20 mvolt 10 us 2) ch 2: 10 mvolt 10 us fig. 17 transient response 2 v in =5v v out =2.5v c out =2.2 f ceramic i out =0~100ma vout, 20mv/div iout, 50ma/div 1 2 > 1) ch 1: 20 mvolt 10 us 2) ch 2: 10 mvolt 10 us fig. 18 load transient response v in =5v v out =2.5v c out =2.2 f ceramic iout=0~100ma ch1:20mv/div iout, 50ma/div
aic1742 8 ? typical performance characteristics (continued) output noise ( v) fig. 19 output noise rms output current (ma) 0.1 1 10 100 0 10 20 30 40 50 60 a ic1742-15 a ic1742-33 c out =4.7 f ceramic c nb =0.01 f f=10hz to 100khz ? block diagram amp error vout bp circuit bias circuit disconnect vin shdn circuit control 1.25v ref limit current thermal shutdown - + gnd ? pin descriptions vin pin - power supply input pin. bypass with a 1 f capacitor to gnd. gnd pin - ground pin. shdn pin - active-low shutdown input pin. bp pin - noise bypass pin. an external bypass capacitor connecting to bp pin to reduce noises at the output. vout pin - output pin. sources up to 150 ma.
aic1742 9 ? detailed description of technical terms dropout voltage (v drop ) the dropout voltage is defined as the difference between the input voltage and output voltage at which the output voltage drops 100mv. below this value, the output voltage will fall as the input voltage reduces. it depends on the load current and junction temperature. line regulation line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. the line regulation is specified as the input voltage changes from v in = v out + 1v to v in = 8v and i out = 1ma. load regulation load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. a pulsed measurement with an input voltage set to v in = v out + v drop can minimize temperature effects. the load regulation is specified by the output current ranging from 0.1ma to 150ma. quiescent current (i q ) quiescent current is the current flowing through ground pin with no output load. ground current (i gnd ) ground current is the current flowing through the ground pin with output load. standby current (i stby ) standby current is the current flowing into the regulator when the output is shutdown by setting v shdn at 0v and v in at 8 v. current limit (i il ) current limiting of aic1742 monitors and controls the maximum output current, in case of a shorted output. it protects device from the damage resulting from any unexpected current. ripple rejection (rr) ripple rejection is the ability of the regulator to reduce voltage ripple, which comes from input, at output terminal. it is specified with a signal of 0.5v p-p at 1khz frequency applying to input, output capacitor at 2.2 f as well as a noise bypass of 0.1 f. ripple rejection, expressed in db, is the ratio of output ripple to input. thermal protection thermal sensor protects device when the junction temperature exceeds t j = +155oc. it signals shutdown logic, turning off pass transistor and allowing ic to cool down. after the ic?s junction temperature cools by 15oc, the thermal sensor will turn the pass transistor back on. thermal protection is designed to protect the device in the event of fault conditions. for a continuous operation, do not exceed the absolute maximum junction-temperature rating of t j = 150oc, or damage may occur to the device.
aic1742 10 ? application information input-output capacitors linear regulators require input and output capacitors to maintain stability. input capacitor at 1 f with 1uf aluminum electrolytic or 2.2 f ceramic output capacitor is recommended. and it should be selected within the equivalent series resistance (esr) range as shown in the figure 20 , 21. esr of ceramic capacitor is lower and its electrical characteristics (capacitance and esr) vary widely over temperature. in general, tantalum or electric output capacitor is suggested for heavy load. normally, the output capacitor should be 1 f (aluminum electrolytic) at least and rates for operating temperature range. note that it?s important to check selected manufactures electrical characteristics (capacitance and esr) over temperature. noise bypass capacitor 0.01 f bypass capacitor at bp pin reduces output voltage noise. and the bp pin has to connect a capacitor to gnd. power dissipation the maximum power dissipation of aic1742 depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the rate of temperature rise is greatly affected by the mounting pad configuration on the pcb, the board material, and the ambient temperature. when the ic mounting with good thermal conductivity is used, the junction temperature will be low even when large power dissipation applies. the power dissipation across the device is p = i out (v in -v out ). the maximum power dissipation is: )r (r )t(t p ba jb aj max + ? = where t j -t a is the temperature difference between the die junction and the surrounding air, r jb is the thermal resistance of the package, and r ba is the thermal resistance through the pcb, copper traces, and other materials to the surrounding air. as a general rule, the lower temperature is, the better reliability of the device is. so the pcb mounting pad should provide maximum thermal conductivity to maintain low device temperature. gnd pin performs a dual function of providing an electrical connection to ground and channeling heat away. therefore, connecting the gnd pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature.
aic1742 11 serial resistor ( ) fig. 20 stable region with extra serial resistor vs. load current load current (ma) 0 20 40 60 80 100 120 140 0.01 0.1 10 100 stable region c out =1 f c out esr ( ) fig. 21 region of stable c out esr vs. load current load current (ma) 0 20 40 60 80 100 120 140 0.01 0.1 1 10 100 stable region c out =4.7 f c out =2.2 f
aic1742 12 ? physical dimensions z sot-23-5 (unit: mm) note: information provided by aic is believed to be accurate and reliabl e. however, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodi ed in an aic product; nor for any infringement of patents or other rights of third parties that may result from its use. we reserve the right to change the circuitry and specifications without notice. life support policy: aic does not authorize any aic product for use in life support devices and/or systems. life support device s or systems are devices or systems which, (i) are intended for surgic al implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. c a a2 b with plating view b l1 l seating plane gauge plane 0.25 a1 section a-a base metal e1 d e aa e1 see view b e 0 0.90 0.30 1.50 2.60 2.80 0.08 0.30 0.05 e q l1 l e1 c e e1 d b a2 a1 0.95 bsc 8 0.60 1.90 bsc 0.60 ref 1.30 1.70 3.00 3.00 0.22 0.50 0.15 0.95 min. s y m b o l a1 . 4 5 max. sot-23-5 millimeters note : 1. refer to jedec mo-178aa. 2. dimensi on "d" does not include mold flash, protru sions or gate burrs. mo ld flash, protrusion or gate bu rrs shall not exceed 10 mil per side. 3. dimensi on "e1" does not inclu de inter-lead flash or protrusions. 4. controlling dimension is millimeter, converted in ch dimensions are not necessarily exact.

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