rev. 0 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a adp3301 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 617/329-4700 world wide web site: http://www.analog.com fax: 617/326-8703 ? analog devices, inc., 1997 general description the adp3301 is a member of the adp330x family of precision low dropout anycap?* voltage regulators. the adp3301 stands out from the conventional ldos with a novel architec- ture, an enhanced process and a new package. its patented design includes a noninverting wideband driver and a stage that permits the use of an internal pole splitting capacitor to stabilize the feedback loop with a single output capacitor as small as 0.47 m f. this device is stable with any type of capacitor regardless of its esr (equivalent serial resistance) value, including ceramic types (mlcc) for space restricted applica- tions. the adp3301 achieves exceptional accuracy of 0.8% at room temperature and 1.4% overall accuracy over tempera- ture, line and load regulations. the dropout voltage of the adp3301 is only 100 mv (typical) at 100 ma. in addition to the new architecture and process, adis new proprietary thermally enhanced package (thermal coastline) can handle 1 w of power dissipation without external heat sink or large copper surface on the pc board. this keeps pc board real estate to a minimum and makes the adp3301 very attractive for use in portable equipment. high accuracy anycap?* 100 ma low dropout linear regulator features high accuracy (over line and load regulations at +25 8 c): 6 0.8% ultralow dropout voltage: 100 mv typical @ 100 ma requires only c o = 0.47 m f for stability anycap?* = stable with all types of capacitors current and thermal limiting low noise dropout detector low shutdown current: 1 m a several fixed voltage options 3.0 v to 12 v supply range C20 8 c to +85 8 c ambient temperature range thermally enhanced so-8 package excellent line and load regulations applications cellular telephones notebook, palmtop computers battery powered systems portable instruments post regulator for switching supplies bar code scanners the adp3301 operates with a wide input voltage range from 3 v to 12 v and delivers a load current in excess of 100 ma. it features an error flag that signals when the device is about to lose regulation or when the short circuit or thermal overload protection is activated. other features include shutdown and opti onal noise reduction capabilities. the adp330x anycap?* ldo family offers a wide range of output voltages and output current levels from 50 ma to 300 ma: ADP3300 (50 ma, sot-23) adp3302 (100 ma, dual output) adp3304 (100 ma, dual output with separate grounds) adp3303 (200 ma) adp3306 (300 ma) adp3301-5.0 5 4 6 3 nr out in 1 2 7 8 err r1 330k w e out c2 0.47? v out = +5v on off
C2C rev. 0 adp3301CxxCspecifications electrical characteristics parameter symbol conditions min typ max units output voltage v out v in = nom v out +0.3 v to 12 v accuracy i l = 0.1 ma to 100 ma t a = +25 c C0.8 +0.8 % v in = nom v out +0.3 v to 12 v i l = 0.1 ma to 100 ma C1.4 +1.4 % line regulation d v o v in = nom v out +0.3 v to 12 v d v in t a = +25 c 0.024 mv/v load regulation d v o i l = 0.1 ma to 100 ma d i l t a = +25 c 0.014 mv/ma ground current i gnd i l = 100 ma 0.85 2 ma i l = 0.1 ma 0.18 0.3 ma ground current i gnd v in = 2.5 v in dropout i l = 0.1 ma 0.6 1.2 ma dropout voltage v drop v out = 98% of v o nominal i l = 100 ma 0.1 0.2 v i l = 10 ma 0.02 0.07 v i l = 1 ma 0.003 0.03 v shutdown threshold v thsd on 2.0 0.9 v off 0.9 0.3 v shutdown pin i sdin 0 < v sd < 5 v 1 m a input current 5 v sd 12 v @ v in = 12 v 22 m a ground current in i q v sd = 0, v in = 12 v shutdown mode t a = +25 c1 m a v sd = 0, v in = 12 v t a = +85 c5 m a output current in i osd t a = +25 c @ v in = 12 v 2 m a shutdown mode t a = +85 c @ v in = 12 v 4 m a error pin output leakage i el v eo = 5 v 13 m a error pin output low voltage v eol i sink = 400 m a 0.13 0.3 v peak load current i ldpk v in = nom v out + 1 v 200 ma thermal regulation d v o v in = 12 v, i l = 100 ma v o t = 10 ms 0.015 %/w output noise v noise f = 10 hzC100 khz @ 5 v output c nr = 0 100 m v rms c nr = 10 nf, c l = 10 m f30 m v rms notes 1 ambient temperature of +85 c corresponds to a typical junction temperature of +125 c under typical full load test conditions. specifications subject to change without notice. (@ t a = C20 8 c to +85 8 c, v in = 7 v, c in = 0.47 m f, c out = 0.47 m f, unless otherwise noted) 1
adp3301 C3C rev. 0 warning! esd sensitive device caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the adp3301 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. pin function descriptions pin mnemonic function 1 & 2 out output of the regulator, fixed 2.7, 3.0, 3.2, 3.3 or 5 volts output voltage. by- pass to ground with a 0.47 m f or larger capacitor. pins 1 and 2 must be con- nected together for proper operation. 3 nr noise reduction pin. used for further reduction of the output noise. (see text for details.) no connection if not used. 4 gnd ground pin. 5 sd active low shutdown pin. connect to ground to disable the regulator output. when shutdown is not used, this pin should be connected to the input pin. 6 err open collector output which goes low to indicate that the output is about to go out of regulation. 7 & 8 in regulator input. pins 7 and 8 must be connected together for proper operation. pin configuration 1 2 3 4 8 7 6 5 top view (not to scale) pin for 5v device out out nr gnd in in err sd adp3301 absolute maximum ratings* input supply voltage . . . . . . . . . . . . . . . . . . . C0.3 v to +16 v shutdown input voltage . . . . . . . . . . . . . . . . C0.3 v to +16 v error flag output voltage . . . . . . . . . . . . . . . C0.3 v to +16 v noise bypass pin voltage . . . . . . . . . . . . . . . . C0.3 v to +5 v power dissipation . . . . . . . . . . . . . . . . . . . internally limited operating ambient temperature range . . . C55 c to +125 c operating junction temperature range . . . C55 c to +125 c q ja . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 c/w q jc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 c/w storage temperature range . . . . . . . . . . . . C65 c to +150 c lead temperature range (soldering 10 sec) . . . . . . . . +300 c vapor phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215 c infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220 c *this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. ordering guide model voltage output package option* adp3301ar-2.7 2.7 v so-8 adp3301ar-3 3.0 v so-8 adp3301ar-3.2 3.2 v so-8 adp3301ar-3.3 3.3 v so-8 adp3301ar-5 5.0 v so-8 contact the factory for the availability of other output voltage options. *so = small outline. other members of anycap?* family 1 output package model current option 2 comments ADP3300 50 ma sot-23 high accuracy adp3302 100 ma so-8 dual output adp3304 100 ma so-8 dual output with separate grounds adp3303 200 ma so-8 high accuracy adp3306 300 ma so-8,tssop-14 high accuracy, high current notes 1 see individual data sheets for detailed ordering information. 2 so = small outline, sot = surface mount, tssop = thin shrink small outline.
adp3301 C4C rev. 0 Ctypical performance characteristics input voltage ?volts 5.0003 4.9985 4.9979 5.2 6 7 8 9 1011121314 1516 5.0000 4.9988 4.9982 4.9997 4.9994 4.9991 v out = 5v i l = 100ma output voltage ?volts i l = 50ma i l = 10ma i l = 0ma figure 2. line regulation: output voltage vs. input voltage output load ?ma ground current ?? 370 0 10 100 20 30 40 50 60 70 80 90 970 470 270 170 670 570 870 770 i l = 0 to 100ma figure 5. quiescent current vs. load current output load ?ma 200 160 0 0 20 200 40 60 80 100 120 140 160 180 120 80 40 input-output voltage ?mv figure 8. dropout voltage vs. output current output load ?ma output voltage ?volts 5.00075 0 20 200 40 60 80 100 120 140 160 180 4.99925 4.99550 4.99850 4.99700 4.99775 4.99625 v out = 5v v in = 7v 5.00000 figure 3. output voltage vs. load current up to 200 ma temperature ? c output voltage ?% 0.2 ?.4 ?5 ?5 135 ? 15 35 75 95 115 55 0.1 0.0 ?.1 ?.2 ?.3 i l = 0 figure 6. output voltage variation % vs. temperature input voltage ?volts 5 0 03 0 432 4 2 1 3 2 11 input-output voltage ?volts r l = 33 w v out = 3.3v figure 9. power-up/power-down input voltage ?volts ground current ?ma 1.0 0.3 0 1.2 12 2.4 3.6 4.8 6 7.2 8.4 9.6 10.8 0.9 0.4 0.2 0.1 0.6 0.5 0.8 0.7 0 v out = 5v i l = 0 figure 4. quiescent current vs. sup- ply voltage temperature ? c ground current ?? 1400 600 0 ?5 ?5 ?5 5 25 45 65 85 105 1200 1000 400 200 800 125 i l = 100ma i l = 0 figure 7. quiescent current vs. temperature time ?? 0 0 100 200 2.0 sd = v in or 3v r l = 33 w ? 3.3k w c l = 0.47? v out = 3.3v 1.0 3.0 4.0 5.0 6.0 7.0 8.0 20 input-output voltage ?volts 40 60 80 120 140 160 180 v in v out figure 10. power-up overshoot
adp3301 C5C rev. 0 time ?? 5.02 4.99 0 20 200 40 60 80 100 120 140 160 180 5.01 5.00 7.0 4.98 7.5 volts 50 w , 0.47? load v in v out = 5v figure 11. line transient response time ?? volts 3.300 0 500 100 200 300 400 3.304 3.302 10 3.298 100 ma c l = 10? v out = 3.3v i(v out ) figure 14. load transient for 10 ma to 100 ma pulse time ?? volts 4 1 05 50 10 15 20 25 30 35 40 45 3 2 0 0 5 v out v sd c = 0.47? r = 33 w on 3.3v output v out = 3.3v figure 17. turn-off time ?? 5.02 4.99 0 40 400 80 120 160 200 240 280 320 360 5.01 5.00 7.0 4.98 7.5 volts 5k w , 0.47? load v in v out = 5v figure 12. line transient response volts time ?sec 3.5 0 05 12 3 4 0 300 100 400 200 3.3v ma v out i out figure 15. short circuit current frequency ?hz ripple rejection ?db 0 ?00 10 100 10m 1k 10k 100k 1m ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 a. 0.47?, r l = 33k w b. 0.47?, r l = 33 w c. 10?, r l = 33k w d. 10?, r l = 33 w b d a c b d a c v out = 3.3v figure 18. power supply ripple rejection time ?? ma 5.00 0 1000 200 400 600 800 0.02 5.01 1 4.99 100 volts c l = 0.47? i(v out ) v out = 5v figure 13. load transient for 1 ma to 100 ma pulse time ?? 4 0 200 40 80 120 160 8 6 0 0 2 5 volts c l = 0.47?, r l = 5k w c l = 10?, r l = 5k w 5.0v v out = 5v figure 16. turn-on frequency ?hz voltage noise spectral density ??/ hz 10 1 0.01 100 1k 100k 10k 0.1 0.47? bypass pin 7, 8 to pin 3 v out = 3.3v, c l = 0.47?, i l = 1ma, c nr = 0 v out = 5v, c l = 0.47?, i l = 1ma, c nr = 0 v out = 2.7-5.0v, c l = 10?, i l = 1ma, c nr = 10nf figure 19. output noise density
adp3301 C6C rev. 0 application information anycap?* the adp3301 is very easy to use. the only external component required for stability is a small 0.47 m f bypass capacitor on the output. unlike the conventional ldo designs, the adp3301 is stable with virtually any type of capacitors (anycap?*) indepen- dent of the capacitors esr (effective series resistance) value. in a typical application, if the shutdown feature is not used, the shut down pin (pin 5) should be tied to the input pin. pins 7 and 8 must be tied together, as well as pins 1 and 2, for proper operation. capacitor selection output capacitors: as with any micropower device, output transient response is a function of the output capacitance. the adp3301 is stable with a wide range of capacitor values, types and esr (anycap?*). a capacitor as low as 0.47 m f is all that is needed for stability. however, larger capacitors can be used if high output current surges are anticipated. the adp3301 is stable with extremely low esr capacitors (esr ? 0), such as multilayer ceramic capacitors (mlcc) or oscon. input bypass capacitor: an input bypass capacitor is not requ ired; however, for applications where the input source is high impedance or far from the input pins, a bypass capacitor is recommended. connecting a 0.47 m f capacitor from the input pins (pins 7 and 8) to ground reduces the circuits sensitivity to pc board layout. if a bigger output capacitor is used, the input capacitor should be 1 m f minimum. low esr capacitors offer better performance on a noisy supply; however, for less demanding requirements a standard tantalum or aluminum electrolythic capacitor is adequate. noise reduction a noise reduction capacitor (c nr ) can be used to further reduce the noise by 6 dbC10 db (figure 20). low leakage capacitors in the 10 nfC100 nf range provide the best performance. since the noise reduction pin (nr) is internally connected to a high impedance node, any connection to this node should be carefully done to avoid noise pickup from external sources. the pad connected to this pin should be as small as possible. long pc board traces are not recommended. in out err gnd adp3301-5.0 nr + 6 7 8 1 2 3 4 5 on off + sd c nr 10nf c2 10? r1 330k w e out c1 1? v out = 5v v in figure 20. noise reduction circuit thermal overload protection the adp3301 is protected against damage due to excessive power dissipation by its thermal overload protection circuit, which limits the die temperature to a maximum of 165 c. under extreme conditions (i.e., high ambient temperature and high power dissipation) where die temperature starts to rise above 165 c, the output current is reduced until die tempera- ture has dropped to a safe level. output current is restored when the die temperature is reduced. current and thermal limit protections are intended to protect the device against accidental overload conditions. for normal operation, device power dissipation should be externally limited so that junction temperatures will not exceed 125 c. calculating junction temperature device power dissipation is calculated as follows : pd = (v in C v out ) i load + (v in ) i gnd where i load and i gnd are load current and ground current, v in and v out are input and output voltages respectively. assuming i load = 100 ma, i gnd = 2 ma, v in = 9 v and v out = 5.0 v, device power dissipation is: pd = (9 v C 5 v ) 100 ma + (9 v ) 2 ma = 418 mw the proprietary package used in adp3301 has a thermal resis tance of 96 c/w, significantly lower than a standard 8-pin soic package at 170 c/w. junction temperature above ambient temperature will be approximately equal to : 0.418 w 96 c/w = 40.1 c to limit the maximum junction temperature to 125 c, maxi- mum ambient temperature must be lower than: t a(max) = 125 c C 40.1 c = 84.9 c printed circuit board layout consideration all surface mount packages rely on the traces of the pc board to conduct heat away from the package. in standard packages the dominant component of the heat resistance path is the plastic between the die attach pad and the individual leads. in typical thermally enhanced packages, one or more of the leads are fused to the die attach pad, significantly decreasing this component. however, to make the improvement meaningful, a significant copper area on the pcb has to be attached to these fused pins. the adp3301s patented thermal coastline lead frame design uniformly minimizes the value of the dominant portion of the thermal resistance. it ensures that heat is conducted away by all pins of the package. this yields a very low 96 c/w thermal resistance for an so-8 package, without any special board layout requirements, relying on the normal traces connected to the leads. the thermal resistance can be decreased by approxi- mately an additional 10% by attaching a few square cm of copper area to the v in pin of the adp3301 package.
adp3301 C7C rev. 0 it is not recommended to use solder mask or silkscreen on the pcb traces adjacent to the adp3301s pins since it will increase the junction to ambient thermal resistance of the package. shutdown mode applying a ttl high signal to the shutdown pin, or tying it to the input pin, will turn the output on. pulling the shutdown pin low, or tying it to ground, will turn the output off. in shutdown mode, quiescent current is reduced to less than 1 m a. error flag dropout detector the adp3301 will maintain its output voltage over a wide range of load, input voltage and temperature conditions. if, for example, regulation is lost by reducing the supply voltage below the combined regulated output and dropout voltages, the error flag will be activated. the err output is an open collector, which will be driven low. once set, the error flags hysteresis will keep the output low until a small margin of operating range is restored either by raising the supply voltage or reducing the load. application circuits crossover switch the circuit in figure 21 shows that two adp3301s can be used to form a mixed supply voltage system. the output switches between two different levels selected by an external digital input. output voltages can be any combination of voltages from the ordering guide. higher output current the adp3301 can source up to 100 ma without any heatsink or pass transistor. if higher current is needed, an appropriate pass transistor can be used, as in figure 22, to increase the output current to 1 a. step-up/step-down post regulator the circuit in figure 23 provides a high precision, low dropout regulated output voltage. it significantly reduces the ripple from a switching regulator. the adp3000 used in this circuit is a switching regulator in the step-up configuration. d1 1n5817 c2 100? 10v l1 6.8? r1 120 w r2 19.6k w 1% r3 10k w 1% adp3301-3.3 in
adp3301 C8C rev. 0 outline dimensions dimensions shown in inches and (mm). c2985-12-2/97 printed in u.s.a. 8-pin small outline package (so-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) pin 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) bsc 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) x 45
|
