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| zldo1117 document number: ds32018 rev. 6 - 2 1 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated 1a low dropout positive regulator 1.2v, 1.5v, 1.8v, 2.5v, 3.3v, 5.0v and adjustable outputs description zldo1117 is a low dropout positive adjustable or fixed-mode regulator with 1a output current capability. the zldo1117 has a 2% tolerance across the industrial temperature range and is guaranteed to have lower than 1.2v dropout at full load current making it ideal to provide well-regulated outputs of 1.2v to 5.0v with input supply voltages up to 18v. the zldo1117 is ideally suited to provide well-regulated supplies for low voltage ic applications such as high-speed bus termination and low current 3.3v logic supply across the whole industrial temperature range. features ? 1.2v maximum dropout at full load current ? 2% tolerance over temperature, line and load variations ? fast transient response ? output current limiting ? built-in thermal shutdown ? good noise rejection ? suitable for use with mlcc capacitors ? qualified to aec-q100 grade 2 (see ?ordering information?) ? ppap capable (note 4) ? -40 to +125c junction temperature range ? available in to252 and sot223 with ?green? molding compound (no br, sb) ? lead-free finish; rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments sot223 to252 1 2 3 adj (gnd) vout vin tab is vout (top view) notes: 1. eu directive 2002/95/ec (rohs) & 2011/65/eu (rohs 2) compliant. all applicable rohs exemptions applied. 2. see http://www.diodes.com for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. 4. automotive products are aec-q100 qualified and are ppap capable. automotive, aec-q100 and standard products are electrically and thermally the same, except where specified. typical applications circuit 1a i/o ? 1.8v core regulator 3.3v 4.7f mlcc zldo1117-18 1.8v 4.7f mlcc
zldo1117 document number: ds32018 rev. 6 - 2 2 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated pin descriptions pin name i/o pin number function adj (gnd) i 1 a resistor divider from this pin to the v out pin and ground sets the output voltage (ground only for fixed-mode). v out o 2 the output of the regulator. a minimum of 4.7f capacitor (0.05 ? esr 0.5? ) must be connected from this pin to ground to insure stability. for impr oved ac load response a lar ger output capacitor is recommended. v in i 3 the input pin of regulator. typically a large storage capacitor (0.05 ? esr 0.5 ? ) is connected from this pin to ground to ensure that the input vo ltage does not sag below the minimum dropout voltage during the load transient response. this pin must always be 1.3v higher than v out in order for the device to regulate properly. absolute maximum ratings (@t a = +25c, unless otherwise specified.) symbol parameter rating unit v in input supply voltage (relative to ground) -0.03 to +18 v t j junction temperature +150 c power dissipation see soa curve t st storage temperature -65 to +150 c unless otherwise stated voltages specif ied are relative to the anode pin. safe operation area (soa) curve esd susceptibility symbol parameter rating unit hbm human body model 4 kv mm machine model 400 v stresses greater than the 'absolute maximum ratings' specified above, may cause permanent damage to th e device. these are stres s ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. semiconductor devices are esd sensitive and may be damaged by exposure to esd ev ents. suitable esd precautions should be taken when handling and transporting these devices 0 0.2 0.4 0.6 0.8 1 1.2 0 5 10 15 20 25 v in - v out (v) i load (a) soa zldo1117 document number: ds32018 rev. 6 - 2 3 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter min max unit v in input voltage 2.7 (note 8) 18 v i o output current 0.01 1 a t j operating junction temperature range (note 5) -40 +125 c package thermal data thermal resistance package rating unit junction-to-ambient, ja sot223 (note 6) to252 (note 7) 107 73 c/w junction-to-case, jc sot223 (note 6) to252 (note 7) 16 12 c/w notes: 5. zldo1117 contains an internal thermal limiting circuit t hat is designed to protect the regulator in the event that th e maximum junction temperature exceeded. when activated, typically at 150c, the regulator output switches off and then back on as the die cools. 6. test condition for sot223: t a = +27c, no air flow, device mounted on 2?x2 ? polyimide pcb, 2 oz copper, 5.6mmx5.6mm pad. 7. test condition for to252: t a = +27c, no air flow, device mounted on 2? x2? polyimide pcb, 1 oz copper, 2cmx2cm pad. 8. ensures correct operation without entering dropout. device will continue to operate below this minimum input voltage under dropout conditions. electrical characteristics (@t a = +25c, unless otherwise specified.) parameter conditions t a min typ max unit reference voltage zldo1117-adj (v in -v out ) = 2v, i o = 10ma 25 1.238 1.250 1.263 v v out +1.4v < v in < 10v, 10ma < i o < 1a ft 1.225 1.275 output voltage zldo1117-1.2 i o = 10ma, v in = 3.2v 25 1.188 1.200 1.212 v 10ma< i o < 1a, 2.7v zldo1117 document number: ds32018 rev. 6 - 2 7 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated application information the zldo1117 family of quasi-ldo regulators is easy to use. th ey are protected against short ci rcuit and thermal overloads. (se e block diagram). thermal protection circuitry will shut down the regulator should the junction temperature exceed +150c at the sense point. the zldo1117 is pin compatible with similar ?1117 regulators and offers exte nded temperature range and improv ed regulation specifications. operation the zldo1117 develops a 1.25v reference voltage between the output and the adjust terminal (see bloc k diagram). by placing a re sistor between these two terminals, a constant curr ent is caused to flow through r1 and down through r2. for fixed output variants res istors r1 and r2 are internal. stability the zldo1117 requires an output capacitor as part of the device frequency compensation. as part of its improved performance ove r industry standard 1117 the zldo1117 is suitable for use with mlcc (multi laye r ceramic chip) capacitors. a minimum of 4.7f ceramic x7r, 4.7f tantalum, or 47 f of aluminum electr olytic is required. the esr of the output capacitor should be less than 0.5 ? . surface mount tantalum capacitors, which have very low esr, are available from severa l manufacturers. when using mlcc capacitors avoid the use of y5v dielectrics. load regulation for improved load regulation the zldo1117-adj should have the upper feedback resistor, r 1 , connected as close as possible to v out and the lower resistor, r2, connected as close as possible to the load gnd return. this helps reduce any parasitic resistance in series with the load. thermal considerations zldo1117 series regulators have internal thermal limiting circ uitry designed to protect the dev ice during over load conditions. for continuous normal load conditions however, the maximum junction temperature rating of +125c must not be exceeded. it is important to give careful considerat ion to all sources of thermal resistance fr om junction to ambient. for the sot223-3l and to252-3l packages, which are designed to be surface mounted, additional heat sources mounted near the device must also be considered. he at sinking is accomplished using the heat spreading capability of the pcb and its copper traces. the jc (junction to tab)of the to252-3l and sot223-3l are +12c/w and +16c/w respectively. thermal resistances from tab to ambient can be as low as +30c/w. the total thermal resistance from junction to ambient can be as low as +42 to +46c/w. this requires a reasonable sized pcb with at least one layer of copper to spread the heat across the board and couple it into the surrounding air. datasheet specifications us ing 2 oz copper and a 5mmx5mm pad with t a = +27c, no air flow yielded ja (junction to tab) of +73c/w and +107c/w for to252-3l and sot223-3l respectively. the thermal resistance for each application will be affected by th ermal interactions with other components on the board. some e xperimentation will be necessary to determine the actual value. ripple rejection when using the zldo1117 adjustable device the adjust terminal can be bypassed to impr ove ripple rejection. when the adjust term inal is bypassed the required value of the output capacitor increases. the device will require an output capacitor of 22f tantalum or 150f alum inum electrolytic when t he adjust pin is bypassed. no rmally, capacitor values on the order of 100f are used in the output of many r egulators to ensure good load transient response with large load c urrent changes. output capacitance can be increased without limit and larger va lues of output capacitance furt her improve stability and transie nt response. the curves for ripple rejection were gener ated using an adjustable device with the adjust pin bypassed. these curves will hold true for all values of output voltage. for proper bypassing, and ripple reje ction approaching the values shown, the impedance of the adjust pin capacitor, at the ripple frequency, should be < r1. r1 is normally in the range of 100 ? to 200 ? . the size of the required adjust pin capacitor is a function of the input ripple frequency. at 120hz, with r1 = 100 ? , the adjust pin capacitor should be >13f. at 10khz only 0.16f is needed. for fixed voltage devices, and adjustable dev ices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (v out /v ref ). for example, with the output voltage equal to 5v, the output ripple will be increased by the ratio of 5v/1.25v. it will increase by a factor of four. ripple rejection will be degraded by 12db from the value shown on the curve. zldo1117 document number: ds32018 rev. 6 - 2 8 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated typical application circuits figure 1 basic adjustable regulator with 5v output using ? ? ? ? ? ? +?= 1r 2r 125.1v out then the output voltage becomes: v0.5 110 330 125.1v out = ? ? ? ? ? ? +?= figure 2 adjustable regulator with iadj errors 2ri 1r 2r 125.1v adj out ?+ ? ? ? ? ? ? +?= because i adj typically is 55 a, its effect is negligible in most applications. v02.53301055 110 330 125.1v 6 out = ? ? ? ? ? ? ??++?= ? ~ 0.4% a. output capacitor selection is crit ical for regulator stability. larger c out values benefit the regulator by improving transient response and loop stability. b. c adj can be used to improve ripple rejection. if c adj is used, a c out that is larger in value than c adj must be used. c. c in is recommended if zldo1117 is not located near the power supply filter. d. an external diode is recommended to protect the r egulator if the input instantaneously is shorted to gnd. e. this device is designed to be stable with tant alum and mlcc capacitors with an esr less than 0.47 ? . zldo1117 document number: ds32018 rev. 6 - 2 9 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated other application circuits figure 3 zldo1117 with extended output voltage c2 100 f 10 f zldo1117 in out adj c1 r2 r1 121 ? 365 ? v in ttl r4 r3 1k 1k 1% 1% t1 mmbt3904 v out figure 4 zldo1117 with disable function zldo1117x50 in out adj 10 f c1 c2 100 f vout = -5v ac in figure 5 zldo1117 as a negative ldo zldo1117 document number: ds32018 rev. 6 - 2 10 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated ordering information part number output voltage packaging (note 11) status reel quantity tape width reel size zldo1117ktc adjustable to252 active 2500 16 mm 13? zldo1117gta sot223 active 1000 12 mm 7? zldo1117k12tc 1.2v to252 active 2500 16 mm 13? zldo1117g12ta sot223 active 1000 12 mm 7? zldo1117k15tc 1.5v to252 active 2500 16 mm 13? zldo1117g15ta sot223 active 1000 12 mm 7? zldo1117k18tc 1.8v to252 active 2500 16 mm 13? zldo1117g18ta sot223 active 1000 12 mm 7? zldo1117k25tc 2.5v to252 active 2500 16 mm 13? zldo1117g25ta sot223 active 1000 12 mm 7? zldo1117k33tc 3.3v to252 active 2500 16 mm 13? zldo1117g33ta sot223 active 1000 12 mm 7? zldo1117k50tc 5.0v to252 active 2500 16 mm 13? zldo1117g50ta sot223 active 1000 12 mm 7? zldo1117qktc adjustable to252 active 2500 16 mm 13? zldo1117qgta sot223 active 1000 12 mm 7? zldo1117qk12tc 1.2v to252 active 2500 16 mm 13? ZLDO1117QG12TA sot223 active 1000 12 mm 7? zldo1117qk15tc 1.5v to252 active 2500 16 mm 13? zldo1117qg15ta sot223 active 1000 12 mm 7? zldo1117qk18tc 1.8v to252 active 2500 16 mm 13? zldo1117qg18ta sot223 active 1000 12 mm 7? zldo1117qk25tc 2.5v to252 active 2500 16 mm 13? zldo1117qg25ta sot223 active 1000 12 mm 7? zldo1117qk33tc 3.3v to252 active 2500 16 mm 13? zldo1117qg33ta sot223 active 1000 12 mm 7? zldo1117qk50tc 5.0v to252 active 2500 16 mm 13? zldo1117qg50ta sot223 active 1000 12 mm 7? note: 11. pad layout as shown on diodes inc. suggested pad layout document ap02001, which c an be found on our website at http://www.d iodes.com/datas heets/ap02001.pdf. zldo1117 document numbe r marking i n to252 sot223 r : ds32018 rev. 6 n formatio n - 2 n w 11 of 14 w ww.diodes.co m d a produc t d iodes inco r z l t line o f r porated july 201 2 ? diodes incorporat e l do1117 2 e d zldo1117 document number: ds32018 rev. 6 - 2 12 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) sot223 to252 sot223 dim min max typ a 1.55 1.65 1.60 a1 0.010 0.15 0.05 b1 2.90 3.10 3.00 b2 0.60 0.80 0.70 c 0.20 0.30 0.25 d 6.45 6.55 6.50 e 3.45 3.55 3.50 e1 6.90 7.10 7.00 e ? ? 4.60 e1 ? ? 2.30 l 0.85 1.05 0.95 q 0.84 0.94 0.89 all dimensions in mm to252 dim min max typ a 2.19 2.39 2.29 a1 0.00 0.13 0.08 a2 0.97 1.17 1.07 b 0.64 0.88 0.783 b2 0.76 1.14 0.95 b3 5.21 5.46 5.33 c2 0.45 0.58 0.531 d 6.00 6.20 6.10 d1 5.21 ? ? e ? ? 2.286 e 6.45 6.70 6.58 e1 4.32 ? ? h 9.40 10.41 9.91 l 1.40 1.78 1.59 l3 0.88 1.27 1.08 l4 0.64 1.02 0.83 a 0 10 ? all dimensions in mm a1 a b3 e 2x b2 d l4 a c2 e a1 l l3 3x b a h a2 e1 zldo1117 document number: ds32018 rev. 6 - 2 13 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated suggested pad layout sot223 to252 dimensions value (in mm) x1 3.3 x2 1.2 y1 1.6 y2 1.6 c1 6.4 c2 2.3 dimensions value (in mm) z 11.6 x1 1.5 x2 7.0 y1 2.5 y2 7.0 c 6.9 e1 2.3 x2 c1 c2 x1 y2 y1 x2 c z x1 y1 e1 y2 zldo1117 document number: ds32018 rev. 6 - 2 14 of 14 www.diodes.com july 2012 ? diodes incorporated zldo1117 a product line o f diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability arising out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com |
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