? semiconductor components industries, llc, 2004 march, 2004 ? rev. p0 1 publication order number: ncp1423/d ncp1423 product preview 200 ma sync-rect pfm step-up dc-dc converter with ring-killer ncp1423 is a monolithic micropower high frequency step?up switching converter ic specially designed for battery operated hand?held electronic products up to 200 ma loading. it integrates synchronous rectifier for improving efficiency as well as eliminating the external schottky diode. high switching frequency (up to 600 khz) allows low profile inductor and output capacitor being used. when the ic is disabled, internal conduction path from lx or bat to out is blocked, out pin is isolated from the battery. this achieves true?cutoff. ring?killer is also integrated to eliminate the high frequency ringing in discontinuous conduction mode. low?battery detector, cycle?by?cycle current limit, overvoltage?protection and thermal shutdown provide value?added features for various battery operated application. with all these functions on, the quiescent supply current is only 9.0 a. this device is available in compact micro?10 package. features ? high efficiency: 95% for 3.3 v output@ 100 ma from 1.2 v input 92% for 2.5 v output@ 50 ma from 1.2 v input 85% for 1.8 v output@ 70 ma from 0.8 v input ? high switching frequency, up to 600 khz (not hitting current limit) ? low quiescent current of 9.0 a ? low battery detector ? 0.8 v startup at no load guaranteed ? ext. adj. output voltage ? ring?killer for discontinuous conduction mode ? thermal shutdown ? 1.5 a cycle by cycle current limit ? output current up to 200 ma ? overvoltage protection ? low profile and minimum external part ? open drain low?battery detector output ? compact micro?10 package typical applications ? personal digital assistants (pda) ? cellular ? camcorders and digital still camera ? hand?held instrument ? conversion from one nih or nicd or one lithium?ion cells to 1.8 v/3.3 v/5.0 v this document contains information on a product under development. on semiconductor reserves the right to change or discontinue this product without notice. pin connections device package shipping 2 ordering information NCP1423DM micro?10 3000 tape & reel http://onsemi.com marking diagram xxxx = device code a = assembly location wl = wafer lot y = year ww = work week (top view) micro?10 dm suffix case 846b en lbo ref fb out lbi aden bat gnd lx 1 2 3 4 5 10 9 8 7 6 micro?10 2for information on tape and reel specifications, including part orientation and tape sizes, please refer to our t ape and reel packaging specifications brochure, brd8011/d. xxxx yww awl
ncp1423 http://onsemi.com 2 figure 1. typical operation circuit en ref fb gnd out bat lx aden lbi lbo off on off on r1 r2 100k 10 h 22 f 22 f 0.1 f * optional * low battery open drain output low battery sense input ncp1423 pin description pin no. symbol description 1 en low?battery detector input and enable. with this pin pulled down below 0.5 v, the device will be disabled and will enters shutdown mode 2 ref 1.195 v reference voltage output, bypass with 0.1 f capacitor if this pin is not loaded, with a 1.0 f bypassing capacitor, this pin can be loaded up to 2.5 ma @ v out = 3.3 v. 3 fb output voltage feedback input 4 gnd ground 5 out power output. out provides bootstrap power to the ic 6 bat battery supply input pin and connection for internal ring?killer 7 lx n?channel and p?channel power mosfet drain 8 aden auto discharge input 9 lbi low?battery detector input 10 lbo open?drain low?battery detector output. output is low when v lbi is < 560 mv. lbo is high impedance shutdown absolute maximum ratings rating symbol value unit power supply (pin 6) v out ?0.3, 6.0 v input / output pins pins 1,3,5,7?9,10 v io ?0.3, 6.0 v thermal characteristics micro?10 plastic package, case 846b, t a = 70 c thermal resistance junction to air p d r q ja 444 250 mw c/w operating junction temperature range t j ? 40 to + 150 c operating ambient temperature range t a ? 40 to + 85 c storage temperature range t stg ? 55 to +150 c note: esd data available upon request.
ncp1423 http://onsemi.com 3 electrical characteristics (v out = 3.3 v, t a = 25 c for typical value, ?40 c t a 85 c for min/max values unless otherwise noted.) characteristic symbol min typ max unit operating voltage v in 0.8 ? v out v output voltage range v out 1.5 ? 5.0 v minimum input voltage for start?up (r load = 33 ) v in_min ? 0.85 0.9 v reference voltage (v out = 3.3 v, i load = 0 a, cref = 100 nf, t a = 25 c) v ref 1.181 1.195 1.207 v reference voltage temperature coefficient tc vref ? 0.03 ? mv/ c fb input threshold (i load = 0 ma, t a = ?40 c to 85 c) v fb 0.485 0.50 0.515 v fb input current i fb ? 1.0 ? na internal nfet on?resistance (i lx =100 ma, v out =3.3 v, t a = 25 c) r ds(on)_n ? 0.3 ? w internal pfet on?resistance (i lx =100 ma, v out =3.3 v, t a = 25 c) r ds(on)_p ? 0.6 ? w lx switch current limit (nfet) (note 1) i lim ? 1.5 ? a operating current into out (v fb = 0.7 v, v out = 3.3 v, t a = 25 c) i q ? 9.0 tbd a operating current into bat (v bat = 1.2 v, v fb = 0.7 v, v lx = 1.2 v, v out = 3.3 v) i qbat ? 1.0 3.0 a shutdown current into bat (lbi/en = 0 v, v out = 3.3 v, v bat = 3.3 v, t a = ?40 c to 85 c) i bat_sd ? ? tbd a lx switch max. on?time (v fb = 0 v, v out = 3.3 v) t on tbd 1.42 tbd s lx switch min. off?time (v fb = 0 v, v out = 3.3 v) t off tbd 240 tbd ns bat to lx resistance (v fb = 1.0 v, v out = 3.3 v) r bat_lx ? 100 ? w lbi input threshold v lbi 0.48 0.50 0.52 v lbi input hysteresis v lbi_hys ? 10 ? mv lbi input current i lbi ? 1.5 ? na lbo low output voltage(v lbi = 0 v, i sink = 1.0 ma) v lbo_l ? ? 0.2 v minimum output current (v out = 3.3 v, v in = 2.5 v) i out 200 ? ? ma minimum output current (v out = 3.3 v, v in = 0.8 v) i out 100 ? ? ma soft start time (v out = 3.3 v, v in = 1.2 v, t a = 25 c) t ss ? tbd tbd ms en shutdown threshold (v bat = 1.2 v) v shdn ? 0.2 ? v en input current i en ? 1.5 ? na en shutdown hysteresis v shdn_hys ? 10 ? mv aden threshold (v bat = 0.8 v to 3.3 v) v aden 0.5*v bat v aden input current i aden ? 1.5 ? na aden hysteresis v ashdn_hys ? 10 ? mv aden switch resistance (v out = 3.3 v) r aden 300 w line regulation (i out = 100 ma, v out = 3.3 v) v line_reg ? 0.3 ? %/v load regulation (50 ma to 100 ma, v in = 1.2 v, v out = 3.3 v) v load_reg ? 0.1 ? %/v thermal shutdown temperature (note 1) t shdn ? ? 145 c thermal shutdown hysteresis (note 1) t sdhys ? 30 ? c 1. values are design guarantee.
ncp1423 http://onsemi.com 4 chip enable figure 2. detailed block diagram _zcur _mson _cen _pfm _tsdon _mainsw2on _mainswofd _synsw2on _synswofd _v refok control logic 20 mv + - pfm voltage reference lbi 9 + - fb 3 + - zlc + true cutoff control v dd gnd v dd gnd + - + gnd r sense gnd sensefet m1 v dd m3 bat 6 lx 7 out 5 v bat 4 gnd v out lbo 10 _ilim 0.5 v 0.5 v m2 en 1 ref 2 aden 8 gnd
ncp1423 http://onsemi.com 5 package dimensions micro?10 dm suffix case 846b?03 issue c s b m 0.08 (0.003) a s t dim min max min max inches millimeters a 2.90 3.10 0.114 0.122 b 2.90 3.10 0.114 0.122 c 0.95 1.10 0.037 0.043 d 0.20 0.30 0.008 0.012 g 0.50 bsc 0.020 bsc h 0.05 0.15 0.002 0.006 j 0.10 0.21 0.004 0.008 k 4.75 5.05 0.187 0.199 l 0.40 0.70 0.016 0.028 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension aao does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension abo does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. 846b?01 obsolete. new standard 846b?02 ?b? ?a? d k g pin 1 id 8 pl 0.038 (0.0015) ?t? seating plane c h j l
ncp1423 http://onsemi.com 6 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. atypicalo 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 atypicalso 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 officers, employees, subsidiaries, af filiates, 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 ncp1423/d sensefet is a trademark of semiconductor components industries, llc. 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 : http://onsemi.com order literature : http://www.onsemi.com/litorder for additional information, please contact your local sales representative.
|
