? semiconductor components industries, llc, 2007 march, 2007 ? rev. 0 1 publication order number: ncp566/d ncp566 1.5 a low dropout linear regulator the ncp566 low dropout linear regulator will provide 1.5 a at a fixed output voltage. the fast loop response and low dropout voltage make this regulator ideal for applications where low voltage and good load transient response are important. device protection includes current limit, short circuit protection, and thermal shutdown. features ? ultra fast transient response ( 1.0 s) ? low ground current (1.5 ma @ iout = 1.5 a) ? low dropout voltage (0.9 v @ iout = 1.5 a) ? low noise (37 vrms) ? 1.2 v, 1.8 v, 2.5 v fixed output versions. other fixed voltages available on request ? current limit protection ? thermal shutdown protection ? these are pb?free devices typical applications ? servers ? asic power supplies ? post regulation for power supplies ? constant current source http://onsemi.com see detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ordering information marking diagrams xx = voltage rating 12 = 1.2 v 18 = 1.8 v 25 = 2.5 v a = assembly location y = year m = date code = pb?free package 1 aym 566xx sot?223 case 318e (note: microdot may be in either location) 1 2 3 v in gnd v out gnd pin connections
ncp566 http://onsemi.com 2 pin description pin no. symbol description 1 maximum ratings rating symbol value unit input voltage (note 1) v in 9.0 v output pin voltage v out ?0.3 to v in + 0.3 v thermal characteristics (notes 2, 3) thermal resistance, junction?to?ambient thermal resistance, junction?to?pin r ja r jp 107 12 c/w operating junction temperature range t j ?40 to 150 c operating ambient temperature range t a ?40 to 125 c storage temperature range t stg ?55 to 150 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. this device series contains esd protection and exceeds the following tests: human body model jesd 22?a114?b machine model jesd 22?a115?a 2. the maximum package power dissipation is: p d t j(max) t a r ja 3. as measured using a copper heat spreading area of 50 mm 2 , 1 oz copper thickness. figure 1. typical schematic voltage reference block v ref = 0.9 v output stage c in 150 f c out 150 f v out gnd v in r1 r2 gnd
ncp566 http://onsemi.com 3 electrical characteristics (v in = v out + 1.6 v, for typical values t j = 25 c, for min/max values t j = ?40 c to +125 c, c in = c out = 150 f unless otherwise noted.) characteristic symbol min typ max unit output voltage (10 ma < i out < 1.5 a; 2.8 v < v in < 9.0 v; t j = ?10 to 105 c) 1.2 v version v out 1.176 (?2%) 1.2 1.224 (+2%) v output voltage (10 ma < i out < 1.5 a; 2.8 v < v in < 9.0 v; t j = ?40 to 125 c) 1.2 v version v out 1.164 (?3%) 1.2 1.236 (+3%) v output voltage (10 ma < i out < 1.5 a; 3.4 v < v in < 9.0 v; t j = ?10 to 105 c) 1.8 v version v out 1.764 (?2%) 1.8 1.836 (+2%) v output voltage (10 ma < i out < 1.5 a; 3.4 v < v in < 9.0 v; t j = ?40 to 125 c) 1.8 v version v out 1.746 (?3%) 1.8 1.854 (+3%) v output voltage (10 ma < i out < 1.5 a; 4.1 v < v in < 9.0 v; t j = ?10 to 105 c) 2.5 v version v out 2.450 (?2%) 2.5 2.550 (+2%) v output voltage (10 ma < i out < 1.5 a; 4.1 v < v in < 9.0 v; t j = ?40 to 125 c) 2.5 v version v out 2.425 (?3%) 2.5 2.575 (+3%) v line regulation (i out = 10 ma) reg line ? 0.02 ? % load regulation (10 ma < i out < 1.5 a) reg load ? 0.04 ? % dropout voltage (i out = 1.5 a) (note 4) vdo ? 0.9 1.3 v current limit i lim 1.6 3.5 ? a ripple rejection (120 hz; i out = 1.5 a) rr ? 85 ? db ripple rejection (1 khz; i out = 1.5 a) rr ? 75 ? db thermal shutdown ? 160 ? c ground current (i out = 1.5 a) iq ? 1.5 3.0 ma output noise voltage (f = 100 hz to 100 khz, i out = 1.5 a) v n ? 37 ? vrms 4. dropout voltage is a measurement of the minimum input/output differential at full load.
ncp566 http://onsemi.com 4 typical characteristics figure 2. output voltage vs. temperature 2.53 2.52 2.51 2.50 2.49 2.48 2.47 ?50 0 50 100 150 t j , junction temperature ( c) v out , output voltage (v) ?50 0 50 100 15 0 t j , junction temperature ( c) i sc , short circuit current limit (a) 3.80 3.75 3.70 3.65 3.60 3.55 3.50 1.2 ?50 0 50 100 150 t j , junction temperature ( c) v in ? v out , dropout voltage (v) 1.0 0.8 0.6 0.4 0.2 0 i out = 1.5 a i out = 50 ma ?25 25 75 125 ?25 25 75 125 ?25 25 75 125 v out = 2.5 v i out = 10 ma figure 3. output voltage vs. temperature 1.820 1.815 1.810 1.805 1.800 1.795 1.790 1.780 ?50 0 50 100 15 0 t j , junction temperature ( c) v out , output voltage (v) ?25 25 75 125 v out = 1.8 v i out = 10 ma figure 4. output voltage vs. temperature figure 5. short circuit current limit vs. temperature figure 6. dropout voltage vs. temperature 1.785 1.220 1.215 1.210 1.205 1.200 1.195 1.190 1.180 ?50 0 50 100 150 t j , junction temperature ( c) v out , output voltage (v) ?25 25 75 125 v out = 1.2 v i out = 10 ma 1.185
ncp566 http://onsemi.com 5 typical characteristics 1.70 ?50 0 50 100 150 t j , junction temperature ( c) i gnd , ground current (ma) 1.65 1.60 1.55 1.50 1.45 1.40 ?25 25 75 125 i out = 1.5 a 1.55 1.60 1.65 1.70 1.75 1.80 0 300 600 900 1200 1500 i out , output current (ma) i gnd , ground current (ma) figure 7. ground current vs. temperature figure 8. ground current vs. output current 100 90 80 70 60 50 40 30 20 10 0 10 1000000 ripple rejection (db) f, frequency (hz) 100 1000 10000 100000 i out = 1.5 a figure 9. ripple rejection vs. frequency figure 10. output capacitor esr stability vs. output current 250 0 750 500 1000 1500 1250 1 10 100 1000 output current (ma) esr ( ) c out = 10 f stable unstable v out = 2.5 v figure 11. load transient from 10 ma to 1.5 a figure 12. load transient from 10 ma to 1.5 a v out = 1.2 v v out = 1.2 v
ncp566 http://onsemi.com 6 typical characteristics 140 120 100 80 60 40 20 0 noise density (nv/ hz ) f, frequency (khz) figure 13. load transient from 1.5 a to 10 ma figure 14. load transient from 1.5 a to 10 ma v out = 1.2 v i out = 10 ma figure 15. noise density vs. frequency figure 16. noise density vs. frequency v out = 1.2 v v out = 1.2 v 100 90 80 70 60 50 40 30 20 10 0 140 120 100 80 60 40 20 0 noise density (nv/ hz ) f, frequency (khz) v out = 1.2 v i out = 1.5 a 100 90 80 70 60 50 40 30 20 10 0
ncp566 http://onsemi.com 7 application information the ncp566 low dropout linear regulator provides fixed voltages at currents up to 1.5 a. it features ultra fast transient response and low dropout voltage. these devices contain output current limiting, short circuit protection and thermal shutdown protection. input, output capacitor and stability an input bypass capacitor is recommended to improve transient response or if the regulator is located more than a few inches from the power source. this will reduce the circuit?s sensitivity to the input line impedance at high frequencies and significantly enhance the output transient response. different types and different sizes of input capacitors can be chosen dependent on the quality of power supply. a 150 f oscon 16sa150m type from sanyo should be adequate for most applications. the bypass capacitor should be mounted with shortest possible lead or track length directly across the regulator?s input terminals. the output capacitor is required for stability. the ncp566 remains stable with ceramic, tantalum, and aluminum? electrolytic capacitors with a minimum value of 1.0 f with esr between 50 m and 2.5 . the ncp566 is optimized for use with a 150 f oscon 16sa150m type in parallel with a 10 f oscon 10sl10m type from sanyo. the 10 f capacitor is used for best ac stability while 150 f capacitor is used for achieving excellent output transient response. the output capacitors should be placed as close as possible to the output pin of the device. if not, the excellent load transient response of ncp566 will be degraded. load transient measurement large load current changes are always presented in microprocessor applications. therefore good load transient performance is required for the power stage. ncp566 has the feature of ultra fast transient response. its load transient responses in figures 11 through 14 are tested on evaluation board shown in figure 17. the evaluation board consists of ncp566 regulator circuit with decoupling and filter capacitors and the pulse controlled current sink to obtain load current transitions. the load current transitions are measured by current probe. because the signal from current probe has some time delay, it causes un?synchronization between the load current transition and output voltage response, which is shown in figures 11 through 14. ncp566 evaluation board gen gnd v rl gnd scope voltage probe + + pulse figure 17. schematic for transient response measurement v out ?v cc v in
ncp566 http://onsemi.com 8 pcb layout considerations good pcb layout plays an important role in achieving good load transient performance. because it is very sensitive to its pcb layout, particular care has to be taken when tackling printed circuit board (pcb) layout. for microprocessor applications it is customary to use an output capacitor network consisting of several capacitors in parallel. this reduces the overall esr and reduces the instantaneous output voltage drop under transient load conditions. the output capacitor network should be as close as possible to the load for the best results. protection diodes when large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. if the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. the discharge current depends on the value of the capacitor, the output voltage and the rate at which v in drops. in the ncp566 linear regulator, the discharge path is through a large junction and protection diodes are not usually needed. if the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. in this case, a diode connected as shown in figure 18 is recommended. figure 18. protection diode for large output capacitors ncp566 gnd v in v out v in v out c out c in 1n4002 (optional) thermal considerations this series contains an internal thermal limiting circuit that is designed to protect the regulator in the event that the maximum junction temperature is exceeded. this feature provides protection from a catastrophic device failure due to accidental overheating. it is not intended to be used as a substitute for proper heat sinking. the maximum device power dissipation can be calculated by: p d t j(max) t a r ja figure 19. thermal resistance 0 50 100 150 200 250 300 350 400 450 50 0 40 60 80 100 120 140 160 180 copper heat?spreader area (mm sq) ja ( c/w) 200 1 oz cu 2 oz cu
ncp566 http://onsemi.com 9 ordering information device nominal output voltage* package shipping ? ncp566st12t3g 1.2 v sot?223 (pb?free) 4000 / tape & reel NCP566ST18T3G 1.8 v sot?223 (pb?free) 4000 / tape & reel ncp566st25t3g 2.5 v sot?223 (pb?free) 4000 / tape & reel *for other fixed output versions, please contact the factory. ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
ncp566 http://onsemi.com 10 package dimensions sot?223 (to?261) case 318e?04 issue l *for additional information on our pb?free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* a1 b1 d e b e e1 4 123 0.08 (0003) a l1 c notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. h e dim a min nom max min millimeters 1.50 1.63 1.75 0.060 inches a1 0.02 0.06 0.10 0.001 b 0.60 0.75 0.89 0.024 b1 2.90 3.06 3.20 0.115 c 0.24 0.29 0.35 0.009 d 6.30 6.50 6.70 0.249 e 3.30 3.50 3.70 0.130 e 2.20 2.30 2.40 0.087 0.85 0.94 1.05 0.033 0.064 0.068 0.002 0.004 0.030 0.035 0.121 0.126 0.012 0.014 0.256 0.263 0.138 0.145 0.091 0.094 0.037 0.041 nom max l1 1.50 1.75 2.00 0.060 6.70 7.00 7.30 0.264 0.069 0.078 0.276 0.287 h e ? ? e1 0 1 0 0 1 0 1.5 0.059 mm inches scale 6:1 3.8 0.15 2.0 0.079 6.3 0.248 2.3 0.091 2.3 0.091 2.0 0.079 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800?282?9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81?3?5773?3850 ncp566/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative the product described herein (ncp566), may be covered by one or more of the following u.s. patents: 5,920,184; 5,834,926. there may be other patents pending.
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