zldo1117 zldo1117 document number: ds32018 rev. 3 1 of 12 www.diodes.com february 2010 ? diodes incorporated 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 pin assignments zldo1117 is a low dropout pos itive 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. sot223 to252 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 ? -40 to 125c junction temperature range ? available in ?green? molding compound (no br, sb) with lead free finish/rohs compliant (note 1) typical application circuit 1a i/o ? 1.8v core regulator 3.3v 4.7f mlcc zldo1117-18 1.8v 4.7f mlcc
zldo1117 zldo1117 document number: ds32018 rev. 3 2 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated absolute maximum ratings symbol paramete r 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 safe operation area (soa) curve esd susceptibility hbm human body model 4 kv mm machine model 400 v (semiconductor devices are esd sensitive and may be damaged by expos ure to esd events. suitable esd precautions should be take n when handling and transporting these devices.) operation above the absolute maximum rating may cause device failure. operation at the absolute maximum ratings, for extended periods, may reduce device reliability. unless otherwise stated voltages specif ied are relative to the anode pin. these are stress ratings only. operation outside the absolute maximum ratings may cause device failure. recommended operating conditions symbol paramete r min max unit v in input voltage 2.7 5 18 v i o output current 0.01 1 a t j o perating junction temperature range -40 125 c package thermal data thermal resistance package unit junction-to-ambient, ja sot223-3l 3 to252-3l 4 107 73 c/w junction-to-case, jc sot223-3l 3 to252-3l 4 16 12 c/w notes: 2. 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 co ols. 3. test condition for sot223-3l: ta = 27 c, no air flow, device mounted on 2?x2? po lyimide pcb, 2 oz copper, 5.6mmx5.6mm pad. 4. test condition for to252-3l: ta = 27c, no air flow, devi ce mounted on 2?x2? polyimide pcb, 1 oz copper, 2cmx2cm pad. 5. ensures correct operation without entering dropout. device will continue to operate below this minimum input voltage under dropout conditions. 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 zldo1117 document number: ds32018 rev. 3 3 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated electrical characteristics (under operating conditions) 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 < v in < 12v ft 1.176 1.224 zldo1117-1.5 i o = 10ma, v in = 3.5v 25 1.485 1.500 1.515 v 0 < i o < 1a, 2.9v < v in < 12v ft 1.470 1.530 zldo1117-1.8 i o = 10ma, v in = 3.8v 25 1.782 1.800 1.818 v 0 < i o < 1a, 3.2v < v in < 12v ft 1.764 1.836 zldo1117-2.5 i o = 10ma, v in = 4.5v 25 2.475 2.500 2.525 v 0 < i o < 1a, 3.9v < v in < 12v ft 2.450 2.550 zldo1117-3.3 i o = 10ma, v in = 5.3v 25 3.267 3.300 3.333 v 0 < i o < 1a, 4.7v < v in < 12v ft 3.235 3.365 zldo1117-5.0 i o = 10ma, v in = 7v 25 4.95 5.000 5.05 v 0 < i o < 1a, 6.4v < v in < 12v ft 4.900 5.100 line regulation zldo1117-adj zldo1117-1.2 i o = 10ma, v out +1.5v zldo1117 zldo1117 document number: ds32018 rev. 3 4 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated typical characteristics -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature (c) ? vout (%) adjustable version i load = 10ma -0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 -50 -25 0 25 50 75 100 125 temperature (c) line regulation (%) v out +1.5v zldo1117 zldo1117 document number: ds32018 rev. 3 5 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated transient load regulation with 10f tantalum capacito r transient load regulation with 4.7f mlcc capacito r transient line regulation with 4.7f mlcc capacito r i load = 100ma, v in - v out = 3v 50 55 60 65 70 75 80 85 90 10 100 1,000 10,000 100,000 frequency (hz) ripple rejection (db) ripple rejection 4v 5v 0 10 10s/div zldo1117 2.5v c in = 1f, c out = 4.7f mlcc i load = 100ma 100m a zldo1117-2.5v c in = 1f, c out = 10f tant i preload = 100ma, i step = 500m a 600m a 0 10m v -10m v 100m a zldo1117-2.5v c in = 1f, c out = 4.7f mlcc i preload = 100ma, i step = 500ma 600m a 0 10m v -10mv
zldo1117 zldo1117 document number: ds32018 rev. 3 6 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated pin descriptions name i/o pin # 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 improved ac load response a larger 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 ensur e that the input volt age does not sag below the minimum dropout voltage during the load tr ansient response. this pin must always be 1.3v higher than v out in order for the device to regulate properly. applications information the zldo1117 family of quasi-ldo regulators is easy to use. th ey are protected against short circuit and thermal overloads. (see block diagram). thermal protection circuitry will shut down the regulator shou ld the junction temperature exceed 150c at the sense point. the zldo1117 is pin compatible with similar ?1117 regul ators and offers extended te mperature range and improved regulation specifications. operation the zldo1117 develops a 1.25v reference voltage between th e output and the adjust terminal (see block diagram). by placing a resistor between these two terminals, a constant current is caused to flow through r1 and down through r2. for fixed output variants resistors r1 and r2 are internal. stability the zldo1117 requires an output capacitor as part of the device frequency comp ensation. as part of its improved performance over industry standard 1117 the zldo1117 is suitable for use with mlcc (multi layer ceramic chip) capacitors. a minimum of 4.7f ceramic x7r, 4.7f t antalum, or 47 f of aluminum electrolytic is required. the esr of the output capacitor should be less than 0.5 ? . surface mount tantalum capac itors, which have very low esr, are available from several manufacturers. when using mlcc capacitors avoid the use of y5v dielectrics. load regulation for improved load regulation the zldo1117-ad j 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 device during overload conditions. for continuous normal load conditions however, the maximum junction temperature rating of 125c must not be exceeded. it is important to give careful consideration to all sources of thermal resistance from junction to ambient. for the sot-223 an d to-252 packages, which are designed to be surface mounted, additional heat sources mounted near the device must also be considered. heat sinking is accomplished using the heat spreading capability of the pcb and its copper traces. the t jc (junction to tab) of the to-252 and sot 223 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 42~46c/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 surroun ding air. datasheet specifications usi ng 2 oz copper and a 5mmx5mm pad with t a =27c, no air flow yielded t ja (junction to tab) of 73c/w and 107c/w for to-252 and sot223 respectively. the thermal resistance for each application will be affected by thermal interactions with ot her components on the board. some experimentation will be necessary to determine the actual value. ripple rejection when using the zldo1117 adjustable device the adjust terminal can be bypassed to improve ripple rejection. when the adjust terminal is bypassed the required value of the output capac itor increases.
zldo1117 zldo1117 document number: ds32018 rev. 3 7 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated the device will require an output capacitor of 22f tantalum or 150f aluminum electr olytic when the adjust pin is bypassed. normally, capacitor values on the order of 100f are used in the output of many regulato rs to ensure good load transient response with large load current changes. output capacitance can be increased without limit and larger values of output capacitance further improve stabi lity and transient response. the curves for ripple rejection were generated 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 rejection 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 functi on 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 devices without an adj ust pin capacitor, the output ripple will increase as the ratio of the output voltage to the referenc e voltage (vout/vref). for example, with t he 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 reject ion will be degraded by 12db fro m the value shown on the curve.
zldo1117 zldo1117 document number: ds32018 rev. 3 8 of 12 www.diodes.com february 2010 ? diodes incorporated 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 = ? ? ? ? ? ? +?= 100 f 10 f zldo1117 in out adj c adj r2 r1 (see note b) (see note c) vin (see note a) vout v ref i adj 1n4002 (see note d) 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 regul ator if the input instantane ously 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
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zldo1117 zldo1117 document number: ds32018 rev. 3 9 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated other typical circuits figure 3. zldo1117 with extended output voltage figure 4. zldo1117 with disable function figure 5. zldo1117 as a negative ldo
zldo1117 zldo1117 document number: ds32018 rev. 3 10 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated ordering information device output voltage packaging (note 8) status reel quantity tape width reel size zldo1117ktc adjustable to252-3l active 2500 16 mm 13? zldo1117gta sot223-3l active 1000 12 mm 7? zldo1117k12tc 1.2v to252-3l active 2500 16 mm 13? zldo1117g12ta sot223-3l active 1000 12 mm 7? zldo1117k15tc 1.5v to252-3l active 2500 16 mm 13? zldo1117g15ta sot223-3l active 1000 12 mm 7? zldo1117k18tc 1.8v to252-3l active 2500 16 mm 13? zldo1117g18ta sot223-3l active 1000 12 mm 7? zldo1117k25tc 2.5v to252-3l active 2500 16 mm 13? zldo1117g25ta sot223-3l active 1000 12 mm 7? ZLDO1117K33TC 3.3v to252-3l active 2500 16 mm 13? zldo1117g33ta sot223-3l active 1000 12 mm 7? zldo1117k50tc 5.0v to252-3l active 2500 16 mm 13? zldo1117g50ta sot223-3l active 1000 12 mm 7? notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied, see eu directive 2002/95/ec annex notes . 8. pad layout as shown on diodes inc. suggested pad layout document zldo02001, which can be found on our website at http://www.diodes.com/ datasheets/ap02001.pdf. marking information 17-vv zldo sot223l (top view) part number: 1117 for adj 17-vv 12 for 1.2v 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5.0v part number: 1117 for adj 17-vv 12 for 1.2v 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5.0v sot263l (top view) zldo 17-vv yyww date code: yy: year: 09~99 ww: week 01~52
zldo1117 zldo1117 document number: ds32018 rev. 3 11 of 12 www.diodes.com february 2010 ? diodes incorporated a product line o f diodes incorporated package outlines sot223 to252
zldo1117 zldo1117 document number: ds32018 rev. 3 12 of 12 www.diodes.com february 2010 ? diodes incorporated 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 warranti es 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 described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes inco rporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorp orated 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 pr oducts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall i ndemnify and hold diodes incorporated and its representatives harmless agai nst all claims, damages, expenses , and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated 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 mo re united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer 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 prope rly 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-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by di odes incorporated. further, customers must fully indemnify di odes incorporated and its representatives against any damages arising out of the use of di odes incorporated products in such safety- critical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com
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