? semiconductor components industries, llc, 2006 april, 2006 ? rev. 2 1 publication order number: ncp3334/d ncp3334 high accuracy, ultra low iq, 500 ma adjustable low dropout regulator the ncp3334 is a high performance, low dropout regulator. with accuracy of 0.9% over line and load and ultra?low quiescent current and noise it encompasses all of the necessary features required by today?s consumer electronics. this unique device is guaranteed to be stable without a minimum load current requirement and stable with any type of capacitor as small as 1.0 f. the ncp3334 offers reverse bias protection. features ? high accuracy over line and load ( 0.9% at 25 c) ? ultra?low dropout voltage ? low noise ? low shutdown current (0.07 a) ? reverse bias protected ? 2.6 v to 12 v supply range ? thermal shutdown protection ? current limitation ? requires only 1.0 f output capacitance for stability ? stable with any type of capacitor (including mlcc) ? no minimum output current required for stability ? this is a pb?free device applications ? pcmcia card ? cellular phones ? camcoders and cameras ? networking systems, dsl/cable modems ? cable set?top box ? mp3/cd players ? dsp supply ? displays and monitors soic?8 case 751 see detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. ordering information marking diagram http://onsemi.com a = assembly location l = wafer lot y = year w = work week = pb?free package 1 8 3334 alyw 1 8 pin connections out in 18 out in sd nc gnd fb
ncp3334 http://onsemi.com 2 figure 1. typical adjustable version application schematic v in v out on off c in 1.0 f c out 1.0 f out fb in in 7 6 5 3 4 21 + + gnd sd out r2 r1 c adj 68 pf pin function description pin no. pin name description 1 gnd power supply ground 2 sd shutdown pin. when not in use, this pin should be connected to the input pin. 3, 4 in power supply input voltage 5, 6 out regulated output voltage. bypass to ground with c out 1.0 f. 7 fb feedback pin; reference voltage = 1.25 v. 8 nc not connected maximum ratings rating symbol value unit input voltage v in ?0.3 to +16 v output voltage v out ?0.3 to v in +0.3 or 10 v* v shutdown pin voltage v sh ?0.3 to +16 v thermal characteristics thermal resistance, junction?to?air r ja 238 c/w operating junction temperature range t j ?40 to +150 c storage temperature range t stg ?50 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. note: this device series contains esd protection and exceeds the following tests: human body model (hbm) jesd 22?a114?b machine model (mm) jesd 22?a115?a *whichever is less. reverse bias protection feature valid only if v out ? v in 7.0 v.
ncp3334 http://onsemi.com 3 electrical characteristics (v out = 1.25 v (v ref ) typical, v in = 2.9 v, t a = ?40 c to +85 c, unless otherwise noted.) characteristic symbol min typ max unit reference voltage accuracy v in = 2.9 v to v out + 4.0 v, i l = 0.1 ma to 500 ma, t a = 25 c v ref ?0.9% 1.239 1.25 +0.9% 1.261 v reference voltage accuracy v in = 2.9 v to v out + 4.0 v, i l = 0.1 ma to 500 ma, t a = 0 c to +85 c v ref ?1.4% 1.233 1.25 +1.4% 1.268 v reference voltage accuracy (note 1) v in = 2.9 v to v out + 4.0 v, i l = 0.1 ma to 500 ma, t a = ?40 c to +150 c v ref ?1.5% 1.231 1.25 +1.5% 1.269 v line regulation v in = 2.9 v to 12 v, i l = 0.1 ma line reg 0.04 mv/v load regulation v in = 2.9 v, i l = 0.1 ma to 500 ma load reg 0.04 mv/ma dropout voltage, v out = 2.5 v to 10 v i l = 500 ma (note 2) i l = 300 ma i l = 50 ma i l = 0.1 ma v drop 340 230 110 10 mv peak output current (notes 1 and 2) (see figure 6) ipk 500 700 860 ma short output current (see figure 6) v out 3.3 v v out > 3.3 v i sc 990 900 1300 ma thermal shutdown t jsd 160 c ground current in regulation i l = 500 ma (note 2) i l = 300 ma (note 2) i l = 50 ma i l = 0.1 ma in dropout v in = v out ?0.1 v, i l = 0.1 ma in shutdown v sd = 0 v i gnd i gndsh 9.0 4.6 0.8 ? ? 0.07 14 7.5 2.5 190 500 1.0 ma a a a output noise i l = 500 ma, f = 10 hz to 100 khz, c out = 10 f v noise 38 vrms shutdown threshold voltage on threshold voltage off v thsd 2.0 0.4 v v sd input current, v sd = 0 v to 0.4 v or v sd = 2.0 v to v in v in 5.4 v v in > 5.4 v i sd 0.07 1.0 5.0 a output current in shutdown mode, v out = 0 v i osd 0.07 1.0 a reverse bias protection, current flowing from the output pin to gnd (v in = 0 v, v out_forced = v out (nom) 7 v) (note 3) i outr 1.0 a recommended operating conditions input voltage v in 2.6 12 v 1. for output current capability for t j < 0 c, please refer to figure 8. 2. t a must be greater than 0 c. 3. reverse bias protection feature valid only if v out ? v in 7.0 v.
ncp3334 http://onsemi.com 4 0 50 100 150 200 250 300 350 400 0 20 40 60 80 100 120 140 t j ( c) v do (mv) figure 2. dropout voltage vs. temperature 50 ma 500 ma 300 ma 0 2 4 6 8 10 12 0 20 40 60 80 100 120 140 t j ( c) i gnd (ma) figure 3. ground current vs. temperature 500 ma 300 ma 50 ma 1.225 1.230 1.235 1.240 1.245 1.250 1.255 1.260 1.265 1.270 1.275 ?40 ?20 0 20 40 60 80 100 120 140 t j ( c) v out (v) figure 4. output voltage vs. temperature 0 100 200 300 400 500 600 700 800 900 1000 0 20 40 60 80 100 120 140 i sc i pk t j ( c) i pk (ma), i sc (ma) figure 5. peak and short current vs. temperature i out (ma) (for specific values of i pk and i sc , please refer to figure 5) v out (v) figure 6. output voltage vs. output current i sc i pk 0.97 v out 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1.0 10 100 f, frequency (khz) rr, ripple rejection (db) figure 7. ripple rejection vs. frequency 50 ma 500 ma 250 ma v out = 2.5 v c out = 10 f t j = 25 c
ncp3334 http://onsemi.com 5 v in , (v) i out , (a) figure 8. output current capability when set at 2.5 v v out 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 0 c ?30 c ?20 c ?10 c ?40 c output current (ma) maximum esr ( ) figure 9. stability with esr vs. i out 0 5.0 10 15 500 400 300 200 100 0 unstable area stable area v in at data sheet test conditions, 25 c, 1 f capacitance
ncp3334 http://onsemi.com 6 applications information reverse bias protection reverse bias is a condition caused when the input voltage goes to zero, but the output voltage is kept high either by a large output capacitor or another source in the application which feeds the output pin. normally in a bipolar ldo all the current will flow from the output pin to input pin through the pn junction with limited current capability and with the potential to destroy the ic. due to an improved architecture, the ncp3334 can withstand up to 7.0 v on the output pin with virtually no current flowing from output pin to input pin, and only negligible amount of current (tens of a) flowing from the output pin to ground for infinite duration. operation with output voltages in the range of 7 to 10 volts requires that the output to input voltage differential be less than 7 volts. input capacitor an input capacitor of at least 1.0 f, any type, is recommended to improve the transient response of the regulator and/or if the regulator is located more than a few inches from the power source. it will also reduce the circuit?s sensitivity to the input line impedance at high frequencies. the capacitor should be mounted with the shortest possible track length directly across the regulator?s input terminals. output capacitor the ncp3334 remains stable with any type of capacitor as long as it fulfills its 1.0 f requirement. there are no constraints on the minimum esr and it will remain stable up to an esr of 5.0 . larger capacitor values will improve the noise rejection and load transient response. noise reduction a 68 pf capacitor connected in parallel with r1 (see figure 1) is recommended to reduce output noise and improve stability. adjustable operation the output voltage can be set by using a resistor divider as shown in figure 1 with a range of 1.25 to 10 v. the appropriate resistor divider can be found by solving the equation below. the recommended current through the resistor divider is from 10 a to 100 a. this can be accomplished by selecting resistors in the k range. as result, the i adj *r2 becomes negligible in the equation and can be ignored. v out 1.25 * 1 r1 r2 i adj *r2 (eq. 1) example: for v out = 2.9 v, can use r 1 = 36 k and r 2 = 27 k . 1.25 * 1 36 k 27 k 2.91 v (eq. 2) dropout voltage the voltage dropout is measured at 97% of the nominal output voltage. thermal considerations internal thermal limiting circuitry is provided to protect the integrated circuit in the ev ent that the maximum junction temperature is ex ceeded. this feature provides protection from a catastrophic device fa ilure due to accidental overheating. this protection feature is not intended to be used as a substitute to heat sinking. the maximum power that can be dissipated, can be calculated with the equation below: p d t j(max) t a r ja (eq. 3) for improved thermal performance, contact the factory for the dfn package option. the dfn package includes an exposed metal pad that is specifically designed to reduce the junction to air thermal resistance, r ja . ordering information device package shipping ? NCP3334DADJG so?8 (pb?free) 98 units / rail ncp3334dadjr2g so?8 (pb?free) 2500 / tape & reel ?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.
ncp3334 http://onsemi.com 7 package dimensions soic?8 case 751?07 issue ah 1.52 0.060 7.0 0.275 0.6 0.024 1.270 0.050 4.0 0.155 mm inches scale 6:1 *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* seating plane 1 4 5 8 n j x 45 k notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. 6. 751?01 thru 751?06 are obsolete. new standard is 751?07. a b s d h c 0.10 (0.004) dim a min max min max inches 4.80 5.00 0.189 0.197 millimeters b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.053 0.069 d 0.33 0.51 0.013 0.020 g 1.27 bsc 0.050 bsc h 0.10 0.25 0.004 0.010 j 0.19 0.25 0.007 0.010 k 0.40 1.27 0.016 0.050 m 0 8 0 8 n 0.25 0.50 0.010 0.020 s 5.80 6.20 0.228 0.244 ?x? ?y? g m y m 0.25 (0.010) ?z? y m 0.25 (0.010) z s x s m 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 japan : on semiconductor, japan customer focus center 2?9?1 kamimeguro, meguro?ku, tokyo, japan 153?0051 phone : 81?3?5773?3850 ncp3334/d the products described herein ncp3334, may be covered by one or more of the following u.s. patents; 5,920,184, 5,966,004, and 5 ,834,926 . there may be other patents pending. micro8 is a trademark of international rectifier. literature fulfillment : literature distribution center for on semiconductor p.o. box 61312, phoenix, arizona 85082?1312 usa phone : 480?829?7710 or 800?344?3860 toll free usa/canada fax : 480?829?7709 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : http://onsemi.com order literature : http://www.onsemi.com/litorder for additional information, please contact your local sales representative.
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