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www.fairchildsemi.com rev. 1.0.5 7/15/02 features ultra low 1mv dropout per 1ma load 1% output voltage accuracy uses low esr ceramic output capacitor to minimize noise and output ripple only 100? ground current at 100ma load ripple rejection up to 85db at 1khz, 60db at 1mhz less than 80? rms noise at bw = 100hz to 100khz excellent line and load transient response over current / over temperature protection guaranteed up to 80/150ma output current industry standard ?e lead sot-23 package fixed 2.85v, 3.0v, 3.3v, 3.6v, 4.7v, 5.0v and adjustable output (ilc7081 only) voltage options metal mask option available for custom voltages between 2.5 to 5.1v applications cellular phones wireless communicators pdas / palmtops / organizers battery powered portable electronics description the ilc7080/81 are 50 or 100ma low dropout (ldo) voltage regulators designed to provide a high performance solution to low power systems. the devices offer a typical combination of low dropout and low quiescent current expected of cmos parts, while uniquely providing the low noise and high ripple rejection characteristics usually only associated with bipolar ldo regulators. the devices have been optimized to meet the needs of modern wireless communications design; low noise, low dropout, small size, high peak current, high noise immunity. the ilc7080/81 are designed to make use of low cost ceramic capacitors while outperforming other devices that require tantalum capacitors. typical applications ilc7080 ilc7081 54 12 3 on off sot-23-5 v out v in c out c noise ilc7080/81 50/100ma sot-23 cmos rf ldo regulators
ilc7080/81 2 rev. 1.0.5 7/15/02 pin assignments pin description ilc7080/81-xx (?ed voltage version) pin description ilc7081-adj (adjustable voltage version) absolute maximum ratings (note 1) recommended operating conditions pin number pin name pin description 1v in connect direct to supply 2 gnd ground pin. local ground for c noise and c out . 3 on/off by applying less than 0.4v to this pin the device will be turned off. 4c noise optional noise bypass capacitor may be connected between this pin and gnd (pin 2). do not connect c noise directly to the main power ground plane. 5v out output voltage. connect c out between this pin and gnd (pin 2). pin number pin name pin description 1v in connect direct to supply 2 gnd ground pin. local ground for c noise and c out . 3 on/off by applying less than 0.4v to this pin the device will be turned off. 4v adj voltage feedback pin to set the adjustable output voltage. do not connect a capacitor to this pin. 5v out output voltage. connect c out between this pin and gnd (pin 2). parameter symbol ratings units input voltage on/off input voltage v in v on/off -0.3 to +13.5 -0.3 to v in v output current i out short circuit protected ma output voltage v out -0.3 to v in +0.3 v package power dissipation (sot-23-5) p d 250 (internally limited) mw maximum junction temp range t j(max) -40 to +150 ? storage temperature t stg -40 to +125 ? operating ambient temperature t a -40 to +85 ? package thermal resistance q ja 333 ?/w parameter min. typ. max. units input voltage v out +v do v out +1 13 v operating ambient temperature -40 +85 ? ilc7080-xx ilc7081-xx sot23-5 on off c noise v in v out gnd 123 4 5 ilc7081-adj sot23-5 on off v adj v in v out gnd 123 4 5 fixed voltage option adjustable voltage option
ilc7080/81 rev. 1.0.5 7/15/02 3 electrical characteristics ilc7080/81aim5 unless otherwise specified, all limits are at t a =25?; v in = v out(nom) +1v, i out = 1ma, c out = 1?, v on/off = 2v. boldface type denotes speci?ations which apply over the speci?d operating temperature range. parameter symbol conditions min. typ. max. units input voltage range v in 213v output voltage v out i out = 1ma 1ma < i out < 100ma 1ma < i out < 100ma -1 -1.5 -3.5 v out(nom) +1 1.5 +3.5 % feedback voltage (adj version) v adj 1.215 1.202 1.240 1.265 1.278 v line regulation ? v out / (v out * ? v in ) v out(nom) +1v < v in < 12v 0.007 0.014 0.032 %/v dropout voltage (note 3) v in - v out 7080/81 i out = 0ma (note 4) 0.1 1 2 mv i out = 10ma 10 25 35 i out = 50ma 50 75 100 7081 only i out = 100ma 100 150 200 i out = 150ma 150 225 300 ground pin current i gnd 7080/81 i out = 0ma 95 200 220 a i out = 10ma 100 220 240 i out = 50ma 100 220 240 7081 only i out = 100ma 100 240 260 i out = 150ma 115 260 280 shutdown (off) current i on/off v on/off = 0v 0.1 2 a on/off input voltage v on/off high = regulator on low = regulator off 2.0 0.6 v on/off pin input current i in( on/off ) v on/off = 0.6v, regulator off v on/off = 2v, regulator on 0.3 1 a peak output current (note 4) i out(peak) v out > 0.95v out(nom) , tpw=2ms 400 500 ma output noise voltage (rms) e n bw=300hz to 50khz, c noise =0.01f 80 v rms ripple rejection ? v out / ? v in c out = 4.7f, i out = 100ma freq. = 1khz 85 db freq. = 10khz 70 freq. = 1mhz 60 dynamic line regulation ? v out(line) v in : v out(nom) +1v to v out(nom) +2v, tr/tf = 2s; i out = 100ma 4mv dynamic load regulation ? v out(load) i out : 0 to 100ma; d(i out )/dt = 100ma/s with c out = 0.47f with c out = 2.2f 50 25 mv short circuit current i sc vout = 0v 600 ma
ilc7080/81 4 rev. 1.0.5 7/15/02 operations the ilc7080/81 ldo design is based on an advanced cir- cuit con?uration for which patent protection has been applied. typically it is very dif?ult to drive a capacitive out- put with an ampli?r. the output capacitance produces a pole in the feedback path, which upsets the carefully tailored dominant pole of the internal ampli?r. traditionally the pole of the output capacitor has been ?liminated?by reduc- ing the output impedance of the regulator such that the pole of the output capacitor is moved well beyond the gain band- width product of the regulator. in practice, this is dif?ult to do and still maintain high frequency operation. typically the output impedance of the regulator is not simply resistive, such that the reactive output impedance interacts with the reactive impedance of the load resistance and capacitance. in addition, it is necessary to place the dominant pole of the circuit at a suf?iently low frequency such that the gain of the regulator has fallen below unity before any of the com- plex interactions between the output and the load occur. the ilc7080/81 does not try to eliminate the output pole, but incorporates it into the stability scheme. the load and output capacitor forms a pole, which rolls off the gain of the regula- tor below unity. in order to do this the output impedance of the regulator must be high, looking like a current source. the output stage of the regulator becomes a transconduc- tance ampli?r, which converts a voltage to a current with a substantial output impedance. the circuit which drives the transconductance ampli?r is the error ampli?r, which compares the regulator output to the band gap reference and produces an error voltage as the input to the transconduc- tance ampli?r. the error ampli?r has a dominant pole at low frequency and a ?ero?which cancels out the effects of the pole. the zero allows the regulator to have gain out to the frequency where the output pole continues to reduce the gain to unity. the con?uration of the poles and zero are shown in ?ure 1. instead of powering the critical circuits from the unregulated input voltage, the cmos rf ldo powers the internal circuits such as the bandgap, the error ampli?r and most of the transconductance ampli?r from the boot strapped regu- lated output voltage of the regulator. this technique offers extremely high ripple rejection and excellent line transient response. a block diagram of the regulator circuit used in the ilc7080/81 is shown in ?ure 2, which shows the input-to- output isolation and the cascaded sequence of ampli?rs that implement the pole-zero scheme outlined above. the ilc7080/81 were designed in a cmos process with some minor additions, which allow the circuit to be used at input voltages up to 13v. the resulting circuit exceeds the frequency response of traditional bipolar circuits. the ilc7080/81 is very tolerant of output load conditions with the inclusion of both short circuit and thermal overload protection. the device has a very low dropout voltage, typically a linear response of 1mv per milliamp of load current, and none of the quasi-saturation characteristics of a bipolar output device. all the good features of the frequency response and regulation are valid right to the point where the regulator goes out of regulation in a 4mv transition region. because there is no base drive, the regulator is capable of providing high current surges while remaining in regulation. this is shown in the high peak current of 500ma which allows for the ilc7080/81 to be used in systems that require short burst mode operation. figure 1. lc7080/81 rf ldo frequency response dominant pole output pole 85 db compensating zero unity gain frequency gain notes: 1. absolute maximum ratings indicate limits which when exceeded may result in damage to the component. electrical specifications do not apply when operating the device outside of its rated operating conditions. 2. specified min/max limits are production tested or guaranteed through correlation based on statistical control methods. measurements are taken at constant junction temperature as close to ambient as possible using low duty pulse testing. 3. dropout voltage is defined as the input to output differential voltage at which the output voltage drops 2% below the nomina l value measured with a 1v differential. 4. guaranteed by design.
ilc7080/81 rev. 1.0.5 7/15/02 5 figure 2. ilc7080/81 rf ldo regulator block diagram on/off gnd v out v in c noise feedback bandgap reference v ref error amplifier trans- conductance amplifier internal v dd shutdown (on/off) operation the ilc7080/81 output can be turned off by applying 0.4v or less to the devices on/off pin (pin 3). in shutdown mode, the ilc7080/81 draws less than 1? quiescent cur- rent. the output of the ilc7081 is enabled by applying 2v to 13v at the on/off pin. in applications where the ilc7080/ 81 output will always remain enabled, the on/off pin may be connected to v in (pin 1). the ilc7080/81s shutdown circuitry includes hysteresis, as such the device will operate properly even if a slow moving signal is applied to the on/ off pin. short circuit protection the ilc7080/81 output can withstand momentary short circuit to ground. moreover, the regulator can deliver very high output peak current due to its 1a instantaneous short circuit current capability. thermal protection the ilc7080/81 also includes a thermal protection circuit which shuts down the regulator when die temperature exceeds 150?c due to overheating. in thermal shutdown, once the die temperature cools to below 140?c, the regulator is enabled. if the die temperature is excessive due to high package power dissipation, the regulators thermal circuit will continue to pulse the regulator on and off. this is called thermal cycling. excessively high die temperature may occur due to high differential voltage across the regulator or high load current or high ambient temperature or a combination of all three. thermal protection protects the regulator from such fault conditions and is a necessary requirement in todays designs. in normal operation, the die temperature should be limited to under 150?c. adjustable output voltage figure 3 shows how an adjustable output voltage can be easily achieved using ilc7081-adj. the output voltage, v out is given by the following equation: v out = 1.24v x (r1/r2 + 1) figure 3. application circuit for adjustable output voltage for best results, a resistor value of 470k ? or less may be used for r2. the output voltage can be programmed from 2.5v to 12v. note: an external capacitor should not be connected to the adjustable feedback pin (pin 4). connecting an external capacitor to pin 4 may cause regulator instability and lead to oscillations. ilc7081-adj v out v in c out r 1 sot23-5 c in on off 123 4 5 v adj r 2
ilc7080/81 6 rev. 1.0.5 7/15/02 maximum output current the maximum output current available from the ilc7080/81 is limited by the maximum package power dissipation as well as the devices internal current limit. for a given ambi- ent temperature, t a , the maximum package power dissipa- tion is given by: p d(max) = (t j(max) - t a ) / ja where t j(max) = 150?c is the maximum junction temperature and ja = 333?c/w is the package thermal resistance. for example at t a = 85?c ambient temperature, the maximum package power dissipation is; pd(max) = 195mw. the maximum output current can be calculated from the fol- lowing equation: i out(max) < p d(max) / (v in - v out ) for example at v in = 6v, v out = 5v and t a = 85?c, the maximum output current is i out(max) < 195ma. at higher output current, the die temperature will rise and cause the thermal protection circuit to be enabled. application hints figure 4 shows the typical application circuit for the ilc7080/81. figure 4. basic application circuit for fixed output voltage input capacitor an input capacitor c in of value 1? or larger should be con- nected from v in to the main ground plane. this will help to ?- ter supply noise from entering the ldo. the input capacitor should be connected as close to the ldo regulator input pin as is practical. using a high-value input capacitor will offer supe- rior line transient response as well as better power supply ripple rejection. a ceramic or tantalum capacitor may be used at the input of the ldo regulator. note that there is a parasitic diode from the ldo regulator out- put to the input. if the input voltage swings below the regulators output voltage by a couple of hundred milivolts then the regula- tor may be damaged. this condition must be avoided. in many applications a large value input capacitor, c in , will hold v in higher than v out and decay slower than v out when the ldo is powered off. output capacitor selection fairchild strongly recommends the use of low esr (equivalent series resistance) ceramic capacitors for c out and c noise . the ilc7080/81 is stable with low esr capacitor (as low as zero ? ). the value of the output capacitor should be 1? or higher. either ceramic chip or a tantalum capacitor may be used at the output. use of ceramic chip capacitors offer signi?ant advantages over tantalum capacitors. a ceramic capacitor is typically consider- ably cheaper than a tantalum capacitor, it usually has a smaller footprint, lower height, and lighter weight than a tantalum capacitor. furthermore, unlike tantalum capacitors which are polarized and can be damaged if connected incorrectly, ceramic capacitors are non-polarized. low value ceramic chip capacitors with x7r dielectric are available in the 100pf to 4.7? range, while high value capacitors with y5v dielectric are available in the 2200pf to 22? range. evaluate carefully before using capacitors with y5v dielectric because their esr increases sig- ni?antly at cold temperatures. figure 10 shows a list of recom- mended ceramic capacitors for use at the output of ilc7080/81. note: if a tantalum output capacitor is used then for stable operation we recommend a low esr tantalum capacitor with maximum rated esr at or below 0.4 ? . low esr tantalum capacitors, such as the tps series from avx corporation (www.avxcorp.com) or the t495 series from kemet (www.kemet.com) may be used. in applications where a high output surge current can be expected, use a high value but low esr output capacitor for superior load transient response. the ilc7080/81 is stable with no load. noise bypass capacitor in low noise applications, the self noise of the ilc7080/81 can be decreased further by connecting a capacitor from the noise bypass pin (pin 4) to ground (pin 2). the noise bypass pin is a high impedance node as such, care should be taken in printed circuit board layout to avoid noise pick-up from external sources. moreover, the noise bypass capacitor should have low leakage. noise bypass capacitors with a value as low as 470pf may be used. however, for optimum performance, use a 0.01? or larger, ceramic chip capacitor. note that the turn on and turn off response of the ilc7080/81 is inversely proportional to the value of the noise bypass capacitor. for fast turn on and turn off, use a small value noise bypass capacitor. in applications were exceptionally low output noise is not required, consider omit- ting the noise bypass capacitor altogether. ilc7080 ilc7081 v out v in c out sot23-5 on off 123 4 5 c noise
ilc7080/81 rev. 1.0.5 7/15/02 7 the effects of esr (equivalent series resistance) the esr of a capacitor is a measure of the resistance due to the leads and the internal connections of the component. typically measured in m ? (milli-ohms) it can increase to ohms in some cases. wherever there is a combination of resistance and current, volt- ages will be present. the control functions of ldos use two voltages in order to maintain the output precisely; v out and v ref . with reference to the block diagram in ?ure 2, v out is fed back to the error ampli?r and is used as the supply voltage for the internal components of the 7080/81. so any change in v out will cause the error ampli?r to try to compensate to maintain v out at the set level and noise on v out will be re?cted into the supply of each internal circuit. the reference voltage, v ref , is in?enced by the c noise pin. noise into this pin will add to the reference voltage and be fed through the circuit. these fac- tors will not cause a problem if some simple steps are taken. figure 5 shows where these added esr resistances are present in the typical ldo circuit. figure 5. esr in c out and c noise with this in mind low esr components will offer better perfor- mance as ldos may be exposed to large transients of output voltage, and current ?ws through the capacitors in order to ?- ter these transient swings. esr is less of a problem with cin as the voltage ?ctuations at the input will be ?tered by the ldo. however, being aware of these current ?ws, there is also another potential source of induced voltage noise from the resis- tance inherent in the pcb trace. figure 6 shows where the addi- tive resistance of the pcb can manifest itself. again these resistances may be very small, but a summation of several cur- rents can develop detectable voltage ripple and will be ampli?d by the ldo. particularly the accumulation of current ?ws in the ground plane can develop signi?ant voltages unless care is taken. with a degree of care, the ilc7080/81 will yield outstanding performance. printed circuit board layout guidelines as was mentioned in the previous section, to take full advan- tage of any high performance ldo regulator requires paying careful attention to grounding and printed circuit board (pcb) layout. figure 6. inherent pcb resistance figure 7 shows the effects of poor grounding and pcb layout caused by the esr and pcb resistances and the accumulation of current ?ws. note particularly that during high output load current, the ldo regulators ground pin and the ground return for c out and c noise are not at the same potential as the system ground. this is due to high frequency impedance caused by pcbs trace inductance and dc resistance. the current loop between c out , c noise and the ldo regulators ground pin will degrade performance of the ldo. figure 7. effects of poor circuit layout figure 8 shows an optimum schematic. in this schematic, high output surge current has little effect on the ground cur- rent and noise bypass current return of the ldo regulator. note that the key difference here is that c out and c noise are directly connected to the ldo regulators ground pin. the ldo is then separately connected to the main ground plane and returned to a single point system ground. ilc7080 ilc7081 v in sot-23-5 c in on off 123 4 5 c noise rf ldo tm regulator r* r* r c v out c out i c i out ilc7080 ilc7081 sot-23-5 on off 123 4 5 c noise r pcb esr r pcb v in v in i out c out i 1 i 2 esr v out r pcb r pcb r pcb c noise c out c in on/off v out v in gnd true gnd (0v) gnd1 gnd2 gnd3 ilc7080/81 5 23 1 4 sot23-5 i load i load +i c out +i c noise +i gnd load
ilc7080/81 8 rev. 1.0.5 7/15/02 the layout of the ldo and its external components are also based on some simple rules to minimize emi and output voltage ripple. figure 8. recommended application circuit schematic figure 9. recommended application circuit layout (not drawn to scale). note: ground plane is bottom layer of pcb and connects to top layer ground connections through vias. c noise 0.01 f c out 4.7 f esr<0.5 ? c in 1 f on/off v out v in v batt ilc7080 5 23 1 4 sot23-5 local ground ground plane ground plane ground plane ground plane dc/dc converter l o a d + gnd evaluation board parts list for printed circuit board shown above grounding recommendations 1. connect c in between v in of the ilc7080/81 and the ?round plane? 2. keep the ground side of c out and c noise connected to the ?ocal ground?and not directly to the ?round plane? 3. on multilayer boards use component side copper for grounding around the ilc7080/81 and connect back to a ?round plane?using vias. 4. if using a dc-dc converter in your design, use a star grounding system with separate traces for the power ground and the control signals. the star should radiate from where the power supply enters the pcb. layout considerations 1. place all rf ldo related components; ilc7080/81, input capacitor c in , noise bypass capacitor c noise and output capac- itor c out as close together as possible. 2. keep the output capacitor c out as close to the ilc7080/81 as possible with very short traces to the v out and gnd pins. 3. the traces for the related components; ilc7080/81, input capacitor c in , noise bypass capacitor c noise and output capac- itor c out can be run with minimum trace widths close to the ldo. 4. maintain a separate ?ocal ground?remote from the ?round plane?to ensure a quiet ground near the ldo. figure 9 shows how this circuit can be translated into a pcb layout. label part number manufacturer description u1 ilc7081aim5-30 fairchild semi. 100ma rf ldo tm regulator j1 69190-405 berg connector, four position header cin grm40 y5v 105z16 murata ceramic capacitor, 1 f,16v, smt (size 0805) cnoise ecu-v1h103kbv panasonic ceramic capacitor, 0.01 f,16v, smt (size 0603) cout grm42-6x5r475k10 murata ceramic capacitor, 4.7 f,16v, smt (size 1206)
ilc7080/81 rev. 1.0.5 7/15/02 9 recommended ceramic output capacitors c out capacitor size i out dielectric part number capacitor vendor 1 f 0805 0 to 100ma x5r c2012x5r1a105kt tdk 0805 x7r grm40x7r105k010 murata 0805 x7r lmk212bj105kg taiyo-yuden 1206 x7r grm42-6x7r105k016 murata 1206 x7r emk316bj105kl taiyo-yuden 1206 x5r tmk316bj105kl taiyo-yuden 2.2 f 0805 0 to 150ma x5r grm40x5r225k 6.3 murata 0805 x5r c2012x5r0j225kt tdk 1206 x5r emk316bj225ml taiyo-yuden 4.7 f 1206 0 to 150ma x5r grm42-6x5r475k010 murata 1206 x7r lmk316bj475ml taiyo-yuden
ilc7080/81 10 rev. 1.0.5 7/15/02 typical performance characteristics unless otherwise speci?d t a =25?c, v in =v out(nom) , + 1v, on/off pin tied to v in. characterization at output currents above 50ma applies to ilc7081. output voltage vs temperature 3.015 3.01 3.005 3 2.995 2.99 output voltage (v) c out = 0.47 f (ceramic) v out = 3.0v 2.985 temperature ( c) 0 50 100 150 -50 dropout characteristics v in (v) 3.4 3.3 3.2 3.1 3 v out (v) c out = 0.47 f (ceramic) v out = 3.3v 3 3.2 3.4 3.6 i out = 0ma i out = 10ma i out = 50ma dropout voltage vs temperature dropout voltage (mv) temperature ( c) 250 200 150 100 50 0 40 85 25 v out = 3.0v i out = 150ma i out = 100ma i out = 50ma i out = 0ma 250 200 150 100 50 0 0 50 100 150 dropout voltage vs i out dropout voltage (mv) output current (ma) t a = 40 c t a = 85 c t a = 25 c v out = 3.0v 150 125 100 75 50 2 4 6 8 10 12 14 ground current vs input voltage v out = 3.0 v c out = 0.47 f (ceramic) i out = 150ma i out = 100ma i out = 50ma i out = 10ma i out = 0ma v in (v) i gnd (a) line transient response 5s/div v in (v) v out (v) 6 5 4 3.01 3.00 2.99 2.98 v in : tr/tf < 1 s v out = 3.0v c out = 2.2 f (ceramic) i out = 100 ma i out = 100ma i out = 150ma 7081 only
ilc7080/81 rev. 1.0.5 7/15/02 11 typical performance characteristics unless otherwise speci?d t a =25?c, v in =v out(nom) , + 1v, on/off pin tied to v in. characterization at output currents above 50ma applies to ilc7081. line transient response ilc7081 5s/div v in (v) v out (v) 5 4 3.01 3.00 2.99 2.98 v in : tr/tf = 2 s v out = 3.0v i out = 100 ma c out = 0.47 f (ceramic) line transient response load transient response 5s/div 100s/div v in (v) v out (v) 5 4 3.01 3.00 2.99 2.98 2.97 v in : tr/tf = 2 s v out = 3.0v i out = 50 ma c out = 0.47 f (ceramic) 3.06 3.04 3.02 3.00 2.98 50 1 v out (v) i out (ma) c out = 0.47 f (ceramic) v out = 3.0 v load transient response ilc7081 100s/div 3.15 3.10 3.05 3.00 100 1 v out (v) i out (ma) c out = 0.47 f (ceramic) v out = 3.0v load transient response ilc7081 100s/div 3.15 3.10 3.05 3.00 2.95 100 1 v out (v) i out (ma) c out = 1 f || 0.47 f (ceramic) v out = 3.0v short circuit current 5ms/div i sc (a) 1.5 1.0 0 v in = 4v 0.5 output shorted to gnd at time, t = 0 t = 0 thermal cycling
ilc7080/81 12 rev. 1.0.5 7/15/02 typical performance characteristics unless otherwise speci?d t a =25?c, v in =v out(nom) , + 1v, on/off pin tied to v in. characterization at output currents above 50ma applies to ilc7081. on/off transient response 500s/div v out (v) v on/off 3 2 0 1 5 0 v out = 3.0v i out = 10ma c out = 0.47 f (ceramic) on/off transient response 200s/div v in (v) 4 1 0 5 0 v out = 3.0 v i out = 50ma c out = 0.47 f (ceramic) on/off transient response ilc7081 200s/div v in (v) 4 3 0 5 0 v out = 3.0v i out = 100ma c out = 0.47 f (ceramic) 3 2 2 1 1 spectral noise density freq (hz) noise (v/rt hz) 32.0 5.6 3.2 1.8 1.0 17.8 10.0 1k 0.6 0.3 0.2 0.1 10k 100k 1m 100 v out = 3.0 v i out = 50ma c out = 0.47 f (ceramic) c out = 1 f (ceramic) c out = 2.2 f (ceramic) spectral noise density 6.0 5.4 4.8 4.2 3.6 spectral noise density freq (hz) noise (v/rt hz) 32.0 5.6 3.2 1.8 1.0 17.8 10.0 1k 0.6 0.3 0.2 0.1 10k 100k 1m 100 v out = 3.0 v c out = 0.47f (ceramic) i out = 1ma i out = 10 ma i out = 50ma i out = 100 ma noise (v/rt hz) freq (hz) 1k 10k 100k 100 3.0 2.4 1.8 1.2 0.6 0 with c out = 10f (ceramic) (for ultra low noise) v out = 3.0 v cnoise = 1 f (ceramic) v in = 3.5v v in = 4v v in = 6v v in = 8v v on/off v on/off cnoise = 0.01 f (ceramic) c noise = 0.01 f (ceramic) c out = 4.7 f (ceramic)
ilc7080/81 rev. 1.0.5 7/15/02 13 typical performance characteristics unless otherwise speci?d t a =25?c, v in =v out(nom) , + 1v, on/off pin tied to v in. characterization at output currents above 50ma applies to ilc7081. ripple rejection vs frequency frequency (hz) 100 90 80 70 60 ripple rejection (db) 1m 10m 100k 10k 1k 50 40 30 20 10 0 v out = 3.0v i out = 100ma ripple rejection vs frequency frequency (hz) 100 90 80 70 60 ripple rejection (db) 1m 10m 100k 10k 1k 50 40 30 20 10 0 v out = 3.0v i out = 10ma c out = 4.7 f (ceramic) c out = 2.2 f (ceramic) c out = 4.7 f (ceramic) c out = 2.2 f (ceramic)
ilc7080/81 14 rev. 1.0.5 7/15/02 package outline dimensions dimensions shown in inches and (mm). 5-lead plastic surface mount (sot-23-5) 0.118 (3.00) 0.102 (2.60) 0.037 (0.95) bsc pin 1 0.071 (1.80) 0.055 (1.40) 0.0059 (0.15) 0.0019 (0.05) 0.019 (0.50) 0.0138 (0.35) 0.057 (1.45) 0.035 (0.90) seating plane 10 0 0.0078 (0.2) 0.0031 (0.08) 0.0217 (0.55) 0.0138 (0.35) 0.055 (1.40) 0.0393 (1.0) 0.122 (3.10) 0.106 (2.70)
ilc7080/81 7/15/02 0.0m 001 stock#ds30007080 ? 2002 fairchild semiconductor corporation life support policy fairchild s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) 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 of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. sot-23 package markings ilc7080aim5-xx ilc7081aim5-xx ordering information (t a = -40 c to +85 c) output voltage (v) grade order information *package marking supplied as: 2.85 a ilc7080aim5285 cfxx 3k units on tape and reel 3.0 a ilc7080aim530 caxx 3k units on tape and reel 3.3 a ilc7080aim533 cbxx 3k units on tape and reel 3.6 a ilc7080aim536 cdxx 3k units on tape and reel 5.0 a ilc7080aim550 ccxx 3k units on tape and reel * note: first two characters identify the product and the last two characters identify the date code output voltage (v) grade order information *package marking supplied as: 2.85 a ilc7081aim5285 cvxx 3k units on tape and reel 3.0 a ilc7081aim530 cqxx 3k units on tape and reel 3.3 a ilc7081aim533 crxx 3k units on tape and reel 3.6 a ilc7081aim536 ctxx 3k units on tape and reel 4.7 a ilc7081aim547 cwxx 3k units on tape and reel 5.0 a ilc7081aim550 csxx 3k units on tape and reel adj a ilc7081aim5adj cuxx 3k units on tape and reel * note: first two characters identify the product and the last two characters identify the date code ilc7080aim5xx 50ma, fixed voltage ilc7081aim5xx 100ma, fixed voltage ilc7081aim5adj 100ma, adjustable voltage

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