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50 ma, high voltage, micropower linear regulator adp1720-ep 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 that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2011 analog devices, inc. all rights reserved. features wide input voltage range: 4 v to 28 v maximum output current: 50 ma low light load current 28 a at 0 a load 35 a at 100 a load low shutdown current: 0.7 a low dropout voltage: 275 mv @ 50 ma load initial accuracy: 0.5% accuracy over line, load, and temperature: 2% stable with small 1 f ceramic output capacitor fixed 3.3 v and 5.0 v output voltage options adjustable output voltage option: 1.225 v to 5.0 v current limit and thermal overload protection logic controlled enable space-saving msop package enhanced product features enhanced processing (ep) for ?55c to +125c operation applications dc-to-dc post regulation pcmcia regulation keep-alive power in portable equipment industrial applications aeronautic and military operating temperature environment typical application circuits gnd 1 gnd 2 gnd 3 gnd 4 8 7 6 gnd in out en 5 adp1720-ep fixed v in = 28v v out = 5v 1f 1f 09723-001 figure 1. adp1720-ep with fixed output voltage, 5.0 v gnd 1 gnd 2 gnd 3 gnd 4 8 7 6 adj in out en 5 adp1720-ep adjustable v in = 12v v out = 1.225v(1 + r1/r2) 1f 1f r1 r2 09723-002 figure 2. adp1720-ep with adjustable output voltage, 1.225 v to 5.0 v general description the adp1720-ep is a high voltage, micropower, low dropout linear regulator. operating over a very wide input voltage range of 4 v to 28 v, the adp1720-ep can provide up to 50 ma of output current. with just 28 a of quiescent supply current and a micropower shutdown mode, this device is ideal for applications that require low quiescent current. the adp1720-ep is available in fixed output voltages of 3.3 v and 5.0 v. an adjustable version is also available, which allows the output to be set anywhere between 1.225 v and 5.0 v. an enable function that allows external circuits to turn on and turn off the adp1720 output is available. for automatic startup, the enable (en) pin can be connected directly to the input rail. the adp1720-ep is optimized for stable operation with small 1 f ceramic output capacitors, allowing for good transient performance while occupying minimal board space. the adp1720-ep operates from C55c to +125c and uses current limit protection and thermal overload protection circuits to prevent damage to the device in adverse conditions. available in a small msop package, the adp1720-ep provides a compact solution with low thermal resistance. additional application and technical information can be found in the adp1720 data sheet.
adp1720-ep rev. 0 | page 2 of 12 table of contents features .............................................................................................. 1 ? enhanced product features ............................................................ 1 ? applications....................................................................................... 1 ? typical application circuits............................................................ 1 ? general description ......................................................................... 1 ? revision history ............................................................................... 2 ? specifications..................................................................................... 3 ? absolute maximum ratings............................................................ 5 ? thermal resistance .......................................................................5 ? esd caution...................................................................................5 ? pin configurations and function descriptions ............................6 ? typical performance characteristics ..............................................7 ? applications information .............................................................. 10 ? thermal considerations............................................................ 10 ? outline dimensions ....................................................................... 12 ? ordering guide .......................................................................... 12 ? revision history 2/11revision 0: initial version
adp1720-ep rev. 0 | page 3 of 12 specifications v in = 12 v, i out = 100 a, c in = c out = 1 f, t a = 25c, unless otherwise noted. table 1. parameter symbol conditions min typ max unit input voltage range v in t j = C55c to +125c 4 28 v operating supply current i gnd i out = 0 a 28 a i out = 0 a, v in = v out + 0.5 v or 4 v (whichever is greater), t j = C55c to +125c 80 a i out = 100 a 35 a i out = 100 a, v in = v out + 0.5 v or 4 v (whichever is greater), t j = C55c to +125c 120 a i out = 1 ma 74 a i out = 1 ma, v in = v out + 0.5 v or 4 v (whichever is greater), t j = C55c to +125c 340 a i out = 10 ma 300 a i out = 10 ma, v in = v out + 0.5 v or 4 v (whichever is greater), t j = C55c to +125c 900 a 100 a < i out < 50 ma, v in = v out + 0.5 v or 4 v (whichever is greater), t j = C55c to +125c 1185 2115 a shutdown current i gnd-sd en = gnd 0.7 a en = gnd, t j = C55c to +125c 1.7 a output fixed output v out i out = 100 a C0.5 +0.5 % voltage accuracy 100 a < i out < 50 ma C1 +1 % 100 a < i out < 50 ma, t j = C55c to +125c C2 +2 % adjustable output 1 v out i out = 100 a 1.2188 1.2250 1.2311 v voltage accuracy 100 a < i out < 50 ma 1.2127 1.2372 v 100 a < i out < 50 ma, t j = C55c to +125c 1.2005 1.2495 v noise (10 hz to 100 khz) out noise v out = 1.6 v, c out = 1 f 146 v rms v out = 1.6 v, c out = 10 f 124 v rms v out = 5 v, c out = 1 f 340 v rms v out = 5 v, c out = 10 f 266 v rms regulation line regulation ?v out /?v in v in = (v out + 0.5 v) to 28 v, t j = C55c to +125c C0.02 +0.02 %/v load regulation 2 ?v out /?i out 1 ma < i out < 50 ma 0.001 %/ma 1 ma < i out < 50 ma, t j = C55c to +125c 0.005 %/ma dropout voltage 3 v dropout i out = 10 ma 55 mv i out = 10 ma, t j = C55c to +125c 105 mv i out = 50 ma 275 mv i out = 50 ma, t j = C55c to +125c 480 mv start-up time 4 t start-up 200 s current limit threshold 5 i limit 55 90 140 ma thermal characteristics thermal shutdown threshold ts sd t j rising 150 c thermal shutdown hysteresis ts sd-hys 15 c en characteristics en input logic high v ih 4 v v in 28 v 1.8 v logic low v il 4 v v in 28 v 0.4 v leakage current v i-leakage en = gnd 0.1 1 a en = in 0.5 1 a adj input bias current (adp1720-ep adjustable) adj i-bias 30 100 na
adp1720-ep rev. 0 | page 4 of 12 parameter symbol conditions min typ max unit power supply rejection ratio psrr f = 120 hz, v in = 8 v, v out = 1.6 v C90 db f = 1 khz, v in = 8 v, v out = 1.6 v C80 db f = 10 khz, v in = 8 v, v out = 1.6 v C60 db f = 120 hz, v in = 8 v, v out = 5 v C83 db f = 1 khz, v in = 8 v, v out = 5 v C70 db f = 10 khz, v in = 8 v, v out = 5 v C50 db 1 accuracy when out is connected directly to adj. when out voltage is set by external feedback resistors, absolute accuracy in a djust mode depends on the tolerances of resistors used. 2 based on an end-point calculation using 1 ma and 50 ma loads. see figure 6 for typical load regulation performance for loads l ess than 1 ma. 3 dropout voltage is defined as the input-to-output voltage differe ntial when the input voltage is set to the nominal output vol tage. this applies only for output voltages above 4 v. 4 start-up time is defined as the time between the rising edge of en to out being at 95% of its nominal value. 5 current limit threshold is defi ned as the current at which the output voltage dr ops to 90% of the specif ied typical value. for example, the current limit for a 5.0 v output voltage is defined as the curre nt that causes the output voltage to drop to 90% of 5.0 v, or 4.5 v.
adp1720-ep rev. 0 | page 5 of 12 absolute maximum ratings table 2. parameter rating in to gnd C0.3 v to +30 v out to gnd C0.3 v to in or +6 v (whichever is less) en to gnd C0.3 v to +30 v adj to gnd C0.3 v to +6 v storage temperature range C65c to +150c operating junction temperature range C55c to +125c soldering conditions jedec j-std-020 stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal resistance ja is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. table 3. thermal resistance package type ja jc unit 8-lead msop 246 66 c/w esd caution
adp1720-ep rev. 0 | page 6 of 12 pin configurations and function descriptions gnd gnd gnd gnd gnd in out en 1 2 3 4 8 7 6 5 adp1720-ep fixed top view (not to scale) 09723-003 gnd gnd gnd gnd adj in out en 1 2 3 4 8 7 6 5 09723-004 a dp1720-ep adjustable top view (not to scale) figure 3. 8-lead msop pin configurationfixed output voltage figure 4. 8-lead msop pin configurationadjustable output voltage table 4. pin function descriptions pin no. fixed adjustable mnemonic description 1 n/a gnd this pin is internally connected to ground. n/a 1 adj adjust. a resistor divider from out to adj sets the output voltage. 2 2 in regulator input supply. bypass in to gnd with a 1 f or greater capacitor. 3 3 out regulated output voltage. bypass out to gnd with a 1 f or greater capacitor. 4 4 en enable input. drive en high to turn on the regulator; drive it low to tur n off the regulator. for automatic startup, connect en to in. 5 5 gnd ground. 6 6 gnd ground. 7 7 gnd ground. 8 8 gnd ground.
adp1720-ep rev. 0 | page 7 of 12 typical performance characteristics v in = 12 v, v out = 5 v, i out = 100 a, c in = c out = 1 f, t a = 25c, unless otherwise noted. 4.97 4.98 4.99 5.00 5.01 5.02 5.03 ?60 ?30 0 30 60 90 120 v out (v) junction temperature (c) i load = 10a i load = 100a i load = 1ma i load = 10ma i load = 25ma i load = 50ma 09723-005 figure 5. output voltage vs. junction temperature 4.9885 4.9890 4.9895 4.9900 4.9905 4.9910 4.9915 4.9920 4.9925 0.01 0.1 1 10 100 v out (v) i load (ma) 09723-006 figure 6. output voltage vs. load current 5.010 4.990 03 v in (v) v out (v) 0 5.008 5.006 5.004 5.002 5.000 4.998 4.996 4.994 4.992 5 10152025 i load = 10a i load = 100a i load = 1ma i load = 10ma i load = 25ma i load = 50ma 09723-007 figure 7. output volt age vs. input voltage 0 200 400 600 800 1000 1200 ?60 ?30 0 30 60 90 120 i gnd (a) junction temperature (c) i load = 50ma i load = 25ma i load = 10ma i load = 1ma i load = 100a i load = 10a 09723-008 figure 8. ground current vs. junction temperature 1200 0 0.01 100 i load (ma) i gnd (a) 0.1 1 10 1000 800 600 400 200 09723-009 figure 9. ground current vs. load current 1400 0 03 v in (v) i gnd (a) 0 1200 1000 800 600 400 200 5 10152025 i load = 50ma i load = 25ma i load = 10ma i load = 1ma i load = 100a i load = 10a 09723-010 figure 10. ground current vs. input voltage
adp1720-ep rev. 0 | page 8 of 12 0 50 100 150 200 250 300 1 10 100 v dropout (mv) i load (ma) 09723-011 figure 11. dropout voltage vs. load current 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 5.05 4.95.05.15.25.3 v out (v) v in (v) 5.4 i load = 1ma i load = 50ma i load = 10ma i load = 25ma 09723-012 figure 12. output voltage vs. input voltage (in dropout) i load = 1ma 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.9 5.0 5.1 5.2 5.3 5.4 i gnd (ma) v in (v) i load = 50ma i load = 10ma i load = 25ma 09723-013 figure 13. ground current vs. input voltage (in dropout) 0 ?100 10 10m frequency (hz) psrr (db) 100 1k 10k 100k 1m ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 100a 10ma 1ma v in = 8v v out = 1.6v c out = 1f v ripple = 50mv 09723-014 figure 14. power supply reje ction ratio vs. frequency (1.6 v adjustable output)
adp1720-ep rev. 0 | page 9 of 12 0 ?100 10 10m frequency (hz) psrr (db) 100 1k 10k 100k 1m ?10 ?20 ?30 ?40 ?50 ?60 ?70 ?80 ?90 v in = 8v v out = 5v c out = 1f v ripple = 50mv 100a 10ma 1ma 09723-015 figure 15. power supply reje ction ratio vs. frequency (5.0 v fixed output) time (20s/div) 10mv/div 1 v in = 12v v out = 1.6v c in = 1f c out = 1f load step from 2.5ma to 47.5ma v out 09723-016 figure 16. load transient response time (100s/div) 10mv/di v 2 2v/di v 1 v out = 5v c in = 1f c out = 1f i load = 50ma v in step from 6v to 7v v out 09723-017 figure 17. line transient response time (40s/div) 2v/di v 2 5v/di v 1 v in = 12v v out = 5v c in = 1f c out = 1f i load = 50ma en v out 09723-018 figure 18. start-up time
adp1720-ep rev. 0 | page 10 of 12 applications information thermal considerations to guarantee reliable operation, the junction temperature of the adp1720-ep must not exceed 125c. to ensure that the junction temperature stays below this maximum value, the user needs to be aware of the parameters that contribute to junction temperature changes. these parameters include ambient tempera- ture, power dissipation in the power device, and thermal resistances between the junction and ambient air ( ja ). the ja number is dependent on the package assembly compounds used and the amount of copper to which the gnd pins of the package are soldered on the pcb. table 5 shows typical ja values of the 8-lead msop package for various pcb copper sizes. table 5. typical ja values for adp1720-ep copper size (mm 2 ) ja (c/w) 25 246 50 216 100 186 300 178 500 169 the junction temperature of the adp1720-ep can be calculated from the following equation: t j = t a + ( p d ja ) (3) where: t a is the ambient temperature. p d is the power dissipation in the die, given by p d = [(v in C v out ) i load ] + ( v in i gnd ) (4) where: i load is the load current. i gnd is the ground current. v in and v out are input and output voltages, respectively. power dissipation due to ground current is quite small and can be ignored. therefore, the junction temperature equation simplifies to the following: t j = t a + {[( v in C v out ) i load ] ja } (5) as shown in equation 5, for a given ambient temperature, input-to-output voltage differential, and continuous load current, there exists a minimum copper size requirement for the pcb to ensure that the junction temperature does not rise above 125c. figure 19 to figure 24 show junction temperature calculations for different ambient temperatures, load currents, v in to v out differentials, and areas of pcb copper for the adp1720-ep. 140 0 02 v in ? v out (v) junction temperature (c) 8 120 100 80 60 40 20 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) 09723-022 figure 19. 500 mm 2 of pcb copper, t a = 25c 140 0 02 v in ? v out (v) 8 120 100 80 60 40 20 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) junction temperature (c) 09723-023 figure 20. 300 mm 2 of pcb copper, t a = 25c 140 0 02 v in ? v out (v) 120 100 80 60 40 20 8 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) 09723-024 junction temperature (c) figure 21. 100 mm 2 of pcb copper, t a = 25c
adp1720-ep rev. 0 | page 11 of 12 140 0 02 8 v in ? v out (v) 120 100 80 60 40 20 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) junction temperature (c) 09723-025 figure 22. 25 mm 2 of pcb copper, t a = 25c 140 0 02 8 v in ? v out (v) 120 100 80 60 40 20 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) 09723-026 junction temperature (c) figure 23. 500 mm 2 of pcb copper, t a = 50c 140 0 02 v in ? v out (v) 120 100 80 60 40 20 8 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) junction temperature (c) 09723-027 figure 24. 300 mm 2 of pcb copper, t a = 50c 140 0 02 v in ? v out (v) junction temperature (c) 120 100 80 60 40 20 8 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) 09723-128 figure 25. 100 mm2 of pcb copper, ta = 50c 140 0 02 v in ? v out (v) 120 100 80 60 40 20 8 1ma 5ma 10ma 20ma 30ma 40ma 50ma (load current) 4 8 12 16 20 24 max t j (do not operate above this point) junction temperature (c) 09723-029 figure 26. 25 mm2 of pcb copper, ta = 50c
adp1720-ep rev. 0 | page 12 of 12 outline dimensions compliant to jedec standards mo-187-aa 6 0 0.80 0.55 0.40 4 8 1 5 0.65 bsc 0.40 0.25 1.10 max 3.20 3.00 2.80 coplanarity 0.10 0.23 0.09 3.20 3.00 2.80 5.15 4.90 4.65 pin 1 identifier 15 max 0.95 0.85 0.75 0.15 0.05 10-07-2009-b figure 27. 8-lead mini small outline package [msop] (rm-8) dimensions shown in millimeters ordering guide model 1 temperature range output voltage (v) package description package option branding adp1720trmz5-ep C55c to +125c 5 8-lead msop rm-8 lku adp1720trmz3.3-ep C55c to +125c 3.3 8-lead msop rm-8 lkt adp1720trmz-ep C55c to +125c 1.225 to 5 8-lead msop rm-8 lg2 1 z = rohs compliant part. ?2011 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d09723-0-2/11(0)

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