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march ? 13, ? 2013 ??? | ?? final ? datasheet 1 ir3535 ? synchronous ? buck ? converter ? driver ? features ? ? 5v ? to ? 7v ? gate ? drivers ? with ? 6a ? gatel ? sink ? current ? and ? 4a ? gateh ? sink ? current ?? ? 4.5v ? to ? 14v ? vin ? range ? ? local ? lossless ? inductor ? current ? sensing ? with ? improved ? noise ? immunity ? and ? accuracy ?? ? single ? reference ? based ? current ? reporting ? output ? ? integrated ? bootstrap ? synchronous ? pfet ? ? tri \ state ? pwm ? diode ? emulation ? mode ? for ? optimal ? light ? load ? efficiency ? ? 7v ? tolerant ? pwm ? input ? compatible ? with ? 3.3v ? logic ? ? mosfet ? monitoring ? with ? phsflt ? output ? ? over ? temperature ? reporting ? ? only ? four ? external ? components ? per ? phase ? ? self \ calibration ? of ? current ? sense ? amplifier ? input ? offset ? to ? maximize ? accuracy ? ? body \ braking? ? feature ? with ? active ? low ? logic ? ? rohs ? compliant ? , ? small ? thermally ? enhanced ?? 16l ? 3 ? x ? 3mm ? mlpq ? package ?? applications ? ? server, ? notebook ? and ? desktop ? computers ? ? game ? consoles ? ? consumer ? electronics ? C ? stb, ? lcd, ? tv, ? printers ? ? general ? purpose ? pol ? dc \ dc ? converters ? basic ? application ? sw pwm vin pgnd vcc vcc boost vin vout pwm csin+ csin \ 4.5v ? to ? 7v lgnd iout iout bbrk# bbrk# refin refin 4.5v ? to ? 14v ir3535 phsflt# phsflt# gatel gateh pvcc tgnd ? figure ? 1: ? ir3535 ? basic ? application ? circuit ? description ? the ? ir3535 ? is ? a ? high ? performance, ? floating ? n \ channel ? mosfet ? driver ? that ? is ? optimized ? for ? maximum ? efficiency ? delivery ? of ? a ? synchronous ? buck ? converter. ? it ? is ? a ? smart ? driver ? that ? continually ? monitors ? mosfet ? conditions, ? contains ? self \ calibrating ? inductor ? current ? sense ? amplifier, ? and ? provides ? diode ? emulation ? mode ? with ? local ? zero ? current ? detection. ?? the ? integrated ? current ? sense ? amplifier ? achieves ? superior ? current ? sense ? accuracy ? vs. ? best \ in \ class ? controller ? based ? inductor ? dcr ? sense ? methods ? while ? delivering ? the ? clean ? and ? accurate ? current ? report ? information. ? the ? ir ? patented ? body \ braking ? ? feature ? reduces ? inductor ? to ? output ? capacitor ? energy ? transfer ? during ? load ? release ? which ? allows ? the ? output ? capacitor ? bank ? to ? be ? reduced. ??? diode ? emulation ? mode ? in ? the ? ir3535 ? alleviates ? the ? zero \ current ? detection ? and ? control ? burden ? from ? the ? pwm ? controller ? and ? increases ? system ? light ? load ? efficiency. ?? the ? ir3535 ? monitors ? mosfet ? conditions ? and ? temperature ? and ? reports ? phase ? fault ? if ? mosfet ? short, ? mosfet ? open ? or ? over ? temperature ? is ? detected. ????? up ? to ? 1.0mhz ? switching ? frequency ? capability ? enables ? high ? performance ? transient ? response, ? miniaturization ? of ? output ? inductors, ? as ? well ? as ? reduced ? input ? and ? output ? capacitors ? while ? maintaining ? industry ? leading ? efficiency. ?? solution ? size, ? thermal ? performance ? and ? cost ? can ? be ? optimized ? by ? combining ? with ? irs ? directfet ? ? mosfets ? and ? utilizing ? a ? dual ? sided ? layout. ? ? figure ? 2: ? ir3535 ? gate ? driver ? waveforms ? pwm ? 5v/divgateh ? 10v/div gatel ? 5v/div ? 100ns/div ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 2 ir3535 ? synchronous ? buck ? converter ? driver ? ordering ? information ? package ? tape ? & ? reel ? qty ? part ? number 16 ? lead ? mlpq ? (3 ? x ? 3 ? mm ? body) ? 3000 ? ir3535mtrpbf ? ? pin ? diagram ? bbr# 1 lgnd csin \ refin 2 3 iout gateh sw pgnd gatel 4 12 11 10 9 5 6 7 8 16 15 14 13 csin+ vcc pvcc pwm phsflt# vin boost ir3535 17 tgnd ? figure ? 3: ? ir3535 ? pin ? diagram ? (top ? view) ? ?? ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 3 ir3535 ? synchronous ? buck ? converter ? driver ? functional ? block ? diagram ? pwm 11 14 vin sw 5 10 csin \ pgnd 13 boost power \ on ? reset ? (por), 3.3v ? reference, and ? dead \ time ? control 16 iout 4 vcc 7 bbr# 1 9 gatel driver driver 15 phsflt# 6 csin+ 2 lgnd 3 refin current ? sense ? amplifier mosfet & ? thermal ? detection s ????? q r por 3.3v vcc \ + 3.3v 200k \ + diode ? emulation ? comparator ir3535 offset \ + 12 gateh 8pvcc 80k 80k 3.3v tri \ state ? logic 5.1k5.1k x32.5 17 tgnd ? figure ? 4: ? ir3535 ? functional ? block ? diagram ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 4 ir3535 ? synchronous ? buck ? converter ? driver ? pin ? descriptions ? pi n # pi n n am e pi n descri pt i on 1 ? bbr# ? 3.3v ? logic ? level ? input, ? 7v ? tolerant, ? with ? internal ? weak ? pull \ up ? to ? 3.3v. ? logic ? low ? to ? disable ? both ? mosfets. ? pulling ? bbr# ? low ? momentarily ? after ? vcc ? passes ? its ? uvlo ? threshold ? activates ? the ? diode ? emulation ? mode. ?? 2 ? lgnd ? ground ? for ? control ? logic ? and ? analog ? circuits. ? ic ? substrate ? is ? connected ? to ? this ? pin. ? 3 ? refin ? reference ? voltage ? input ? from ? the ? pwm ? controller. ? the ? current ? sense ? signal ? is ? referenced ? to ? the ? voltage ? on ? this ? pin. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 4 ? iout ? voltage ? on ? this ? pin ? is ? equal ? to ? v(refin) ? + ?? 32.5 ? * ? [v(csin+) ? C ? v(csin \ )]. ? float ? this ? pin ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 5 ? csin \? inverting ? input ? to ? the ? current ? sense ? amplifier. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 6 ? csin+ ? non \ inverting ? input ? to ? the ? current ? sense ? amplifier. ? connect ? to ? lgnd ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ? 7 ? vcc ? bias ? voltage ? for ? control ? logic ? and ? analog ? functions. ?? 8 ? pvcc ? voltage ? for ? low \ side ? mosfet ? driver. ? internal ? bootstrap ? synchronous ? pfet ? is ? connected ? from ? this ? pin ? to ? the ? boost ? pin. ? connect ? a ? 1uf ? capacitor ? between ? pvcc ? and ? pgnd. ? 9 ? gatel ? low \ side ? driver ? output ? and ? input ? to ? gateh ? non \ overlap ? comparator. ? 10 ? pgnd ? return ? for ? low ? side ? driver ? and ? reference ? for ? gateh ? non \ overlap ? comparator. ? 11 ? sw ? return ? for ? high \ side ? driver ? and ? reference ? for ? gatel ? non \ overlap ? comparator. ? 12 ? gateh ? high \ side ? driver ? output ? and ? input ? to ? gatel ? non \ overlap ? comparator. ? 13 ? boost ? supply ? for ? high \ side ? driver. ? internal ? bootstrap ? synchronous ? pfet ? is ? connected ? between ? this ? pin ? and ? the ? pvcc ? pin. ? connect ? a ? minimum ? 0.22f ? 16vdc ? capacitor ? from ? boost ? to ? sw ? pin. ? 14 ? vin ? power ? rail ? input ? for ? phase ? fault ? detection. ? 15 ? phsflt# ? open ? collector ? output ? of ? the ? phase ? fault ? comparators. ? 7v ? tolerant, ? connect ? to ? an ? external ? pull \ up ? resistor. ? output ? is ? low ? when ? a ? mosfet ? fault ? or ? over ? temperature ? condition ? is ? detected. ? 16 ? pwm ? 3.3v ? logic ? level ? tri \ state ? pwm ? input, ? 7v ? tolerant. ? high ? turns ? the ? control ? mosfet ? on, ? and ? low ? turns ? the ? synchronous ? mosfet ? on. ? tri \ state ? turns ? the ? control ? mosfet ? off ? without ? delay. ?? depending ? on ? the ? mode ? the ? ir3535, ? tri \ state ? either ? turns ? the ? synchronous ? mosfet ? off ? without ? delay ? in ? body \ braking? ? mode ? or ? turns ? synchronous ? moefet ? off ? when ? the ? current ? reaches ? zero ? in ? diode ? emulation ? mode. ? see ? theory ? of ? operation ? section ? for ? further ? details. ? 17 ? tgnd ? ground ? pad ? for ? thermal ? dissipation. ? connected ? to ? ic ? substrate. ? connect ? this ? pad ? to ? ground ? planes ? through ? four ? vias. ? ?? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 5 ir3535 ? synchronous ? buck ? converter ? driver ? absolute ? maximum ? ratings ? ? stresses ? beyond ? those ? listed ? under ? absolute ? maximum ? ratings ? may ? cause ? permanent ? damage ? to ? the ? device. ? these ? are ? stress ? ratings ? only ? and ? functional ? operation ? of ? the ? device ? at ? these ? or ? any ? other ? conditions ? beyond ? those ? indicated ? in ? the ? operational ? sections ? of ? the ? specifications ? are ? not ? implied. ? ? storage ? temperature ? range ? \ 65c ?? to ? 150c ? operating ? junction ? temperature ?? 0c ?? to ? 150c ? esd ? rating ? hbm ? class ? 1c ? jedec ? standard ? msl ? rating ? 2 ? reflow ? temperature ? 260c ? ?? ? pin ? number ? pin ? name ? v max ? v min ? i source ? i sink ? 1 ? bbr# ? 8v ? \ 0.3v ? 1ma ? 1ma ? 2 ? lgnd ? n/a ? n/a ? n/a ? n/a ? 3 ? refin ? 3.5v ? \ 0.3v ? 1ma ? 1ma ? 4 ? iout ? 8v ?\ 0.3v ? 5ma ? 5ma ? 5 ? csin \? 8v ? \ 0.3v ? 1ma ? 1ma ? 6 ? csin+ ? 8v ?\ 0.3v ? 1ma ? 1ma ? 7 ? vcc ? 8v ? \ 0.3v ? n/a ? 15ma ? 8 ? pvcc ? 8v ?\ 0.3v ? n/a ? 5a ? for ? 100ns, ? 100ma ? dc ? 9 ? gatel ? 8v ? \ 0.3v ? dc, ?? \ 5v ? for ? 100ns ? 5a ? for ? 100ns, ? 200ma ? dc ? 7a ? for ? 100ns, ? 200ma ? dc ? 10 ? pgnd ? 0.3v ?\ 0.3v ? 7a ? for ? 100ns, ? 200ma ? dc ? n/a ? 11 ? sw ? 25v ? \ 0.3v ? dc, ?? \ 10v ? for ? 100ns ? 5a ? for ? 100ns, ? 100ma ? dc ? n/a ? 12 ? gateh ? 33v ? \ 0.3v ? dc, ?? \ 10v ? for ? 100ns ? 5a ? for ? 100ns, ? 100ma ? dc ? 5a ? for ? 100ns, ? 100ma ? dc ? 13 ? boost ? 33v ? \ 0.3v ? 1a ? for ? 100ns, ? 100ma ? dc ? 3a ? for ? 100ns, ? 100ma ? dc ? 14 ? vin ? 16v ?\ 0.3v ? n/a ? 1ma ? 15 ? phsflt# ? 8v ? \ 0.3v ? 1ma ? 20ma ? 16 ? pwm ? 8v ?\ 0.3v ? 1ma ? 1ma ? note: ? 1. ?? maximum ?? gateh ? C ? sw ? = ? 8v ? 2. ? maximum ?? boost ? C ? gateh ? = ? 8v downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 6 ir3535 ? synchronous ? buck ? converter ? driver ? electrical ?? specifications ? recommended ? operating ? conditions ? for ? reliable ? operation ? with ? margin ? ? symbol ? min ? max ? units recommended ? vin ? range ? vin ? 4.5 ? 14 ? v ? recommended ? vcc ? range ? vcc ? 4.5 ? 7 ? v ? recommended ? refin ? range ? (v cc ? = ? 4.5v ? to ? 5.5v) ? refin ? 0.25 ? 2.0 ? v ? recommended ? refin ? range ? (v cc ? = ? 5.5v ? to ? 7v) ? refin ? 0.25 ? 3.3 ? v ? recommended ? switching ? frequency ? f sw ? 200 ? 1000 ? khz ? recommended ? operating ? junction ? temperature ? t j ? 0 ? 125 ? c ? ? electrical ? characteristics ? the ? electrical ? characteristics ? involve ? the ? spread ? of ? values ? guaranteed ? within ? the ? recommended ? operating ? conditions. ? typical ? values ? represent ? the ? median ? values, ? which ? are ? related ? to ? 25c. ?? c gateh ? = ? 3.3nf, ? c gatel ? = ? 6.8nf ? (unless ? otherwise ? specified). ?? parameter ? conditions ? min ? typ ? max ? unit ? gate ? drivers ? gateh ? source ? resistance ? boost ? C ? sw ? = ? 7v ?? ? 670 ?? ? m ?? gateh ? sink ? resistance ? boost ? C ? sw ? = ? 7v ?? ? 670 ?? ? m ?? gatel ? source ? resistance ? pvcc ? C ? pgnd ? = ? 7v ?? ? 670 ?? ? m ?? gatel ? sink ? resistance ? pvcc ? C ? pgnd ? = ? 7v ?? ? 300 ?? ? m ?? gateh ? source ? current ? boost ? = ? 7v, ? gateh ? = ? 2.5v, ? sw ? = ? 0v ?? ? 3 ?? ? a ? gateh ? sink ? current ? boost ? = ? 7v, ? gateh ? = ? 2.5v, ? sw ? = ? 0v ?? ? 4 ?? ? a ? gatel ? source ? current ? pvcc ? = ? 7v, ? gatel ? = ? 2.5v, ? sw ? = ? 0v ?? ? 4 ?? ? a ? gatel ? sink ? current ? pvcc ? = ? 7v, ? gatel ? = ? 2.5v, ? sw ? = ? 0v ?? 6 ? ? ? a ? gateh ? rise ? time ? boost ? C ? sw ? = ? 7v, ? measure ? 1v ? to ? 4v ? transition ? time ? ?? 5 ? 10 ?? ns ? gateh ? fall ? time ? boost ? C ? sw ? = ? 7v, ? measure ? 4v ? to ? 1v ? transition ? time ? ?? 4 ?? 8 ? ns ? gatel ? rise ? time ? pvcc ? C ? pgnd ? = ? 7v, ? measure ? 1v ? to ? 4v ? transition ? time ? ?? 10 ? 20 ? ns ? gatel ? fall ? time ? pvcc ? C ? pgnd ? = ? 7v, ? measure ? 4v ? to ? 1v ? transition ? time ? ? 5 ? 10 ? ns ? gatel ? low ? to ? gateh ? high ? delay ? boost ? = ? pvcc ? = ? 7v, ? sw ? = ? pgnd ? = ? 0v, ? measure ? time ? from ? gatel ? falling ? to ? 1v ? to ? gateh ? rising ? to ? 1v ? 10 ? 15 ? 30 ? ns ? gateh ? low ? to ? gatel ? high ? delay ? boost ? = ? pvcc ? = ? 7v, ? sw ? = ? pgnd ? = ? 0v, ? measure ? time ? from ? gateh ? falling ? to ? 1v ? to ? gatel ? rising ? to ? 1v ? 10 ? 15 ? 30 ? ns ? disable ? pull ? down ? resistance ? gateh ? to ? sw, ? gatel ? to ? pgnd ? 30 ? 80 ? 130 ? k ?? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 7 ir3535 ? synchronous ? buck ? converter ? driver ? parameter ? conditions ? min ? typ ? max ? unit ? pwm ? comparator ? high ? side ? switch ? threshold ? pwm ? low ? or ? pwm ? tri \ state ? to ? high ? 2.5 ?? ?? ?? v ? low ? side ? switch ? threshold ? pwm ? high ? or ? pwm ? tri \ state ? to ? low ?? ?? ? 0.8 ? v ? pwm ? tri \ state ? float ? voltage ? floating ? 1.2 ?? 1.65 ? 2.1 ? v ? hysteresis ? active ? to ? tri \ state ? to ? active, ? note ? 1 ? 65 ? 76 ? 100 ? mv ? tri \ state ? propagation ? delay ? time ? c pwm ? = ? 20pf, ? measure ? from ? v(pwm) ? = ? 0v ? to ? gatel ? < ? 1v ? ?? ?? 190 ? ns ? c pwm ? = ? 20pf, ? measure ? from ? v(pwm) ? = ? 5v ? release ? to ? gateh ? < ? 1v ? ?? 380 ? ns ? pwm ? input ? sinking ? impedance ?? ? 3.67 ? 5.1 ? 8.7 ? k ?? source ? impedance ?? ? ? 3.67 ? 5.1 ? 8.7 ?? k ?? gateh ? turn \ off ? propagation ? delay ? measure ? from ? v(pwm) ? falling ? edge ? to ? gateh ? < ? 1v ? ?? 25 ? 45 ? ns ? current ? sense ? amplifier ? csin+/ \? bias ? current ?? \ 100 ? 0 ? 100 ? na ? input ? offset ? voltage ? csin+ ? = ? csin \? = ? refin, ? measure ? input ? referred ? offset ? from ? refin ? \ 750 ?? 750 ? v ? calibrated ? input ? offset ? voltage ? self \ calibrated ? offset, ? note ? 1 ?\ 450 ? 0 ? 450 ? v ? gain ? 0.5v ?? v(refin) ? < ? 2.25 ? 30 ? 32.5 ? 35 ? v/v ? unity ? gain ? bandwidth ? c(iout) ? = ? 10pf, ? measure ? at ? iout. ? note ? 1 ? 4.8 ? 6.8 ? 8.8 ? mhz ? slew ? rate ?? ? ? 6 ?? v/s ? differential ? input ? range ? ?? 0.8v ?? v(refin) ?? 2.25v, ? note ? 1 ?\ 10 ?? 25 ? mv ? 0.25v ?? v(refin) ?? 0.8v, ? note ? 1 ?\ 5 ?? 25 ? mv ? common ? mode ? input ? range ?? 0 ?? vcc ? C ? 2.5 ? v ? output ? impedance ?? ? 62 ? 200 ?? ? iout ? sink ? current ? driving ? external ? 3 ? k ?? 0.5 ? 0.8 ? 1.1 ? ma ? bootstrap ? diode ? forward ? voltage ? i(boost) ? = ? 30ma, ? vcc ? = ? 6.8v ? 360 ? 520 ? 960 ? mv ? digital ? output ?D? phase ? fault ? voh ? high ? level ? pull \ up ? voltage ?? ? 7 ? v ? vol ? i(phsflt#) ? = ? 4ma ?? 150 ? 300 ? mv ? leakage ? current ? v(phsflt#) ? = ? 5.5v ?? 0 ? 1 ? a ? phase ? fault ? detection ? top ? side ? threshold ? measure ? from ? vin ? to ? sw ? 1.9 ? 2.2 ? 2.5 ? v ? bottom ? side ? threshold ?? 150 ? 200 ? 250 ? mv ? bottom ? fet ? open ? threshold ?? \ 250 ?\ 215 ?\ 180 ? mv ? propagation ? delay ? pwm ? high ? to ? pwm ? low ? cycles ?? 15 ?? cycles ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 8 ir3535 ? synchronous ? buck ? converter ? driver ? parameter ? conditions ? min ? typ ? max ? unit ? operating ? bias ? voltage ?? 4.5 ?? 7 ? v ? digital ? input ?D? bbr# ? vil ? input ? low ? threshold ? 0.8 ?? ? v ? vih ? input ? high ? threshold ?? ? 2.0 ? v ? internal ? pull ? up ? resistance ? vcc ? > ? uvlo ? 69 ? 200 ? 340 ? k ?? internal ? pull ? up ? voltage ? vcc ? > ? uvlo ?? 3.3 ?? v ? general ? vcc ? supply ? current ?? 4 ? 8 ? 12 ? ma ? vin ? supply ? curent ? 4.5 ?? v(vin) ?? 14v ? 0.05 ? 0.15 ? 0.4 ? ma ? switch ? node ? bias ? current ?? ? ? ? 5 ? ma ? boost ? supply ? current ? 4.75 ?? v(boost) ? C ? v(sw) ?? 7v ? 0.5 ? 1.5 ? 3 ? ma ? refin ? bias ? current ?? \ 1.5 ? 0 ? 1 ? a ? sw ? floating ? voltage ? csin \? tied ? to ? sw, ? pwm ? tri \ state ? 0.1 ? 0.3 ? 0.4 ? v ? diode ?? emulation ? mode ? comparator ? input ? offset ? voltage ? note ? 2 ?\ 12 ?\ 3 ? 3 ? mv ? leading ? edge ? blanking ? time ? v(gatel) ? > ? 1v ? starts ? timer, ? note ? 1 ? 100 ? 150 ? 200 ? ns ? propagation ? delay ? blanking ? expired, ? +2.5mv ? overdrive ? to ? v(gatel) ? < ? 1v, ? note ? 1 ? ? 41 ? 50 ? ns ? negative ? current ? time \ out ? pwm ? = ? tri \ state, ? v(sw) ? < ? = ?\ 10mv ? 20 ? 30 ? 45 ? s ? vcc ? under ? voltage ? lockout ? start ?? 3.3 ? 3.7 ? 4.1 ? v ? stop ?? 3 ? 3.4 ? 3.8 ? v ? hysteresis ?? 0.25 ? 0.35 ? 0.45 ? v ? thermal ? flag ? rising ? threshold ? phsflt# ? drives ? low. ? note ? 1 ?? 115 ?? c ? falling ? threshold ? note ? 1 ?? 95 ?? c ? note: ?? 1. ?? guaranteed ? by ? design ? but ? not ? tested ? in ? production ? 2. ? the ? diode ? emulation ? mode ? (dem) ? comparator ? measures ? the ? sw ? against ? pgnd. ?? the ? input ? offset ? is ? biased ? slightly ? to ? the ? negative ? so ? that ? a ? slightly ? positive ? current ? in ? the ? synchronous ? mosfet ? is ? treated ? as ? zero ? current ? to ? accommodate ? propagation ? delays ? and ? untrimmed ? accuracy. downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 9 ir3535 ? synchronous ? buck ? converter ? driver ? theory ? of ? operation ? description ? the ? ir3535 ? is ? a ? synchronous ? buck ? driver ? which ? provides ? system ? designers ? with ? ease ? of ? use ? and ? flexibility ? required ? in ? cutting ? edge ? cpu, ? gpu ? and ? memory ? power ? delivery ? designs. ?? the ? ir3535 ? is ? designed ? to ? work ? with ? a ? controller ? that ? provides ? the ? pwm ? signal. ? the ? ir3535 ? incorporates ? a ? continuously ? self \ calibrated ? current ? sense ? amplifier, ? optimized ? for ? use ? with ? inductor ? dcr ? sensing. ? the ? current ? sense ? amplifier ? provides ? signal ? gain ? and ? noise ? immunity, ? providing ? multiphase ? systems ? with ? a ? superior ? design ? toolbox ? for ? programmed ? impedance ? designs. ?? the ? ir3535 ? also ? provides ? a ? phase ? fault ? signal ? capable ? of ? detecting ? open ? or ? shorted ? mosfets, ? or ? an ? over \ temperature ? condition ? in ? the ? vicinity ? of ? the ? driver. ?? the ? ir3535 ? accepts ? an ? active ? low ? body \ braking? ? input ? which ? disables ? the ? output ? mosfets ? to ? enhance ? transient ? performance ? or ? provide ? a ? high ? impedance ? output. ? the ? ir3535 ? pwm ? input ? is ? compatible ? with ? 3.3v ? logic ? and ? 7v ? tolerant. ? it ? accepts ? 3 \ level ? pwm ? input ? signals, ? with ? a ? diode ? emulation ? feature ? when ? the ? pwm ? signal ? is ? floated, ? allowing ? designers ? to ? maximize ? system ? efficiency ? at ? light ? loads ? without ? compromising ? transient ? performance. ? body \ braking? ? mode ? there ? are ? two ? ways ? to ? place ? the ? ir3535 ? in ? body \ braking? ? mode, ? in ? which ? two ? mosfets ? are ? turned ? off. ? pulling ? bbr# ? low ? forces ? the ? ir3535 ? into ? body \ braking? ? mode ? rapidly, ? which ? is ? used ? to ? enhance ? transient ? response ? after ? load ? release ? or ? provide ? a ? high ? impedance ? output. ?? if ? the ? bbr# ? input ? is ? high ? and ? has ? not ? been ? low ? since ? power ? on, ? the ? body \ braking? ? is ? activated ? when ? the ? pwm ? input ? enters ? the ? tri \ state ? region, ? which ? is ? withing ? a ? range ? around ? 1.65v. ? the ? body \ braking? ? response ? is ? slower ? due ? to ? the ? hold \ off ? time ? created ? by ? the ? paracitic ? capacitor ? with ? pull \ up ? or ? pull \ down ? resistor ? at ? pwm ? pin. ? for ? better ? performance, ? no ? more ? than ? 100pf ? parasitic ? capacitive ? load ? should ? be ? present ? on ? the ? pwm ? line ? of ? ir3535. ?? diode ? emulation ? mode ? an ? additional ? feature ? of ? the ? ir3535 ? is ? diode ? emulation ? mode. ? this ? function ? improves ? efficiency ? by ? preventing ? negative ? inductor ? current ? from ? flowing ? in ? the ? synchronous ? mosfet. ?? as ? shown ? in ? figure ? 5, ? when ? the ? pwm ? input ? enters ? the ? tri \ state ? region ? the ? control ? mosfet ? is ? turned ? off ? first, ? and ? the ? synchronous ? mosfet ? is ? initially ? turned ? on ? and ? then ? is ? turned ? off ? when ? the ? output ? current ? reaches ? zero. ? if ? the ? sensed ? output ? current ? does ? not ? reach ? zero ? within ? a ? set ? amount ? of ? time ? the ? gate ? driver ? will ? assume ? that ? the ? output ? is ? de \ biased ? and ? turn ? off ? the ? synchronous ? mosfet, ? allowing ? the ? switch ? node ? to ? float. ?? this ? is ? in ? contrast ? to ? the ? body \ braking? ? mode ? shown ? in ? figure ? 6, ? where ? gatel ? follows ? pwm ? input. ? the ? schottky ? diode ? in ? parallel ? with ? the ? synchronous ? mosfet ? conducts ? for ? a ? longer ? period ? of ? time ? and ? therefore ? lowers ? the ? light ? load ? efficiency. ? ?? ? ? ? ? ? ? figure ? 5: ? diode ? emulation ? mode ? ?? ? ? ? ?? figure ? 6: ? body \ braking? ? mode ? pwm ? 2 v/div sw ? 5v/div 400ns / div ? gaetl ? 10v/div pwm ? 2 v/div sw ? 5v/div 400ns / div ? gatel ? 10v/div downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 10 ir3535 ? synchronous ? buck ? converter ? driver ? the ? zero ? current ? detection ? circuit ? in ? the ? ir3535 ? is ? independent ? of ? the ? current ? sense ? amplifier ? and ? therefore ? still ? functions ? even ? if ? the ? current ? sense ? amplifier ? is ? not ? used. ?? as ? shown ? in ? figure ? 4, ? an ? offset ? is ? added ? to ? the ? diode ? emulation ? comparator ? so ? that ? a ? slightly ? positive ? output ? current ? in ? the ? inductor ? and ? synchronous ? mosfet ? is ? treated ? as ? zero ? current ? to ? accommodate ? propagation ? delays, ? preventing ? any ? negative ? current ? flowing ? in ? the ? synchronous ? mosfet. ? this ? causes ? the ? schottky ? diode ? in ? parallel ? with ? the ? synchronous ? mosfet ? to ? conduct ? before ? the ? inductor ? current ? actually ? reaches ? zero, ? and ? the ? conduction ? time ? increases ? with ? inductance ? of ? the ? output ? inductor. ? to ? set ? the ? ir3535 ? in ? diode ? emulation ? mode, ? the ? bbr# ? pin ? must ? be ? toggled ? low ? at ? least ? once ? after ? the ? vcc ? passes ? its ? uvlo ? threshold ? during ? power ? up. ? one ? simple ? way ? is ? to ? use ? the ? internal ? bbr# ? pull \ up ? resistor ? (200k ? typical) ? with ? an ? external ? capacitor ? from ? bbr# ? pin ? to ? lgnd. ? to ? ensure ? the ? diode ? emulation ? mode ? is ? properly ? set, ? the ? bbr# ? voltage ? should ? be ? lower ? than ? 0.8v ? when ? the ? vcc ? voltage ? passes ? its ? uvlo ? threshold ? (3.3v ? minimum ? and ? 3.7v ? typical), ? as ? shown ? in ? figure ? 7. ? a ? digital ? signal ? from ? the ? pwm ? controller ? can ? also ? be ? used ? to ? set ? the ? diode ? emulation ? mode. ? the ? bbr# ? signal ? can ? either ? be ? pulled ? low ? for ? at ? least ? 20ns ? after ? the ? vcc ? passes ? its ? uvlo ? threshold, ? as ? shown ? in ? figure ? 8, ? or ? be ? pulled ? low ? before ? vcc ? power ? up ? and ? then ? released ? after ? the ? vcc ? passes ? its ? uvlo ? threshold, ? as ? shown ? in ? figure ? 9. ?? once ? the ? diode ? emulation ? mode ? is ? set, ? it ? cannot ? be ? reset ? until ? the ? vcc ? power ? is ? recycled. ? tri \ state ? gate ? drivers ? the ? gate ? drivers ? can ? deliver ? up ? to ? 4a ? peak ? current ? and ? 6a ? sink ? current ? for ? low ? side ? driver. ? an ? adaptive ? non \ overlap ? circuit ? monitors ? the ? voltage ? on ? the ? internal ? gateh ? and ? gatel ? pins ? to ? prevent ? mosfet ? shoot \ through ? current ? while ? minimizing ? body ? diode ? conduction. ? tri \ state ? operation ? prevents ? negative ? inductor ? current ? and ? negative ? output ? voltage ? during ? power \ down. ? the ? gate ? driver ? incorporates ? pull ? down ? resistors ? on ? the ? mosfet ? gates ? to ? prevent ? spurious ? turn \ on ? of ? the ? output ? stage ? even ? when ? the ? ic ? is ? off ? and ? there ? is ? a ? high ? dv/dt ? event ? on ? the ? vin ? supply ? rail. ? the ? gate ? drivers ? pull ? low ? if ? the ? supply ? voltages ? are ? below ? the ? normal ? operating ? range. ?? phase ? fault ? circuit ? and ? thermal ?? flag ? circuit ? (phsflt#) ? the ? ir3535 ? phase ? fault ? circuit ? monitors ? the ? switch ? node ? with ? respect ? to ? vin ? and ? ground ? to ? determine ? whether ? ? figure ? 7: ? diode ? emulation ? setup ? through ? bbr# ? capacitor ? ? ?? ? ? ? ? ? figure ? 8: ? diode ? emulation ? setup ? through ? bbr# ? input ? ? ?? ? ? ? ? ? figure ? 9: ? diode ? emulation ? setup ? through ? bbr# ? input ? there ? is ? a ? defective ? mosfet ? in ? the ? converter. ? the ? output ? of ? the ? phsflt# ? is ? high ? during ? normal ? operation ? and ? becomes ? low ? when ? there ? is ? a ? fault. ? the ? driver ? monitors ? the ? vcc ? 2v/div ? bbr# ? 1v/div ? 2ms / div ? sw ? 10v/div ? vcc ? 2v/div bbr# ? 2v/div ? 4ms / div ? vcc ? 2v/div ? bbr# ? 2v/div ? 4ms / div ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 11 ir3535 ? synchronous ? buck ? converter ? driver ? mosfets ? it ? drives. ? if ? the ? switch ? node ? is ? a ? certain ? voltage ? lower ? than ? vin ? when ? the ? pwm ? signal ? goes ? low ? or ? if ? the ? switch ? node ? is ? a ? certain ? voltage ? above ? ground ? when ? the ? pwm ? signal ? rises, ? this ? gives ? a ? possible ? fault ? signal. ? if ? there ? are ? a ? number ? of ? consecutive ? possible ? faults ? the ? phase ? fault ? signal ? is ? asserted. ?? thermal ? flag ? circuit ? monitors ? the ? temperature ? of ? the ? ir3535 ? driver. ? if ? the ? temperature ? goes ? above ? 115c ? (typical) ? the ? phsflt# ? pin ? is ? pulled ? low ? after ? a ? maximum ? delay ? of ? 100us. ? the ? phsflt# ? becomes ? high ? once ? the ? temperature ? drops ? below ? 95c ? (typical). ? the ? phsflt# ? pin ? can ? be ? pulled ? low ? by ? either ? the ? mosfet ? fault ? circuit ? or ? the ? thermal ? flag ? circuit. ? the ? phsflt# ? signal ? could ? be ? used ? to ? turn ? off ? the ? ac/dc ? converter ? or ? blow ? a ? fuse ? to ? disconnect ? the ? dc/dc ? converter ? input ? from ? the ? supply. ? if ? phsflt# ? is ? not ? used ? it ? can ? be ? floated ? or ? connected ? to ? lgnd. ? lossless ? average ? inductor ? current ? sensing ? inductor ? current ? can ? be ? sensed ? by ? connecting ? a ? series ? resistor ? and ? a ? capacitor ? network ? in ? parallel ? with ? the ? inductor ? and ? measuring ? the ? voltage ? across ? the ? capacitor, ? as ? shown ? in ? figure ? 10. ?? ?? ? ? ? ? figure ? 10: ? inductor ? current ? sensing ? the ? equation ? of ? the ? sensing ? network ? is ? as ? follows. ? cs cs l l l cs cs l cs c sr r l s rs i c sr s v s v + + = + = 1 1 )( 1 1 )( )( ? l l rs i )( = cs cs l c r r l when = usually ? the ? resistor ? r cs ? and ? capacitor ? c cs ? are ? chosen ? so ? that ? the ? time ? constant ? of ? r cs ? and ? c cs ? equals ? the ? time ? constant ? of ? the ? inductor ? which ? is ? the ? inductance ? l ? over ? the ? inductor ? dcr ? (r l ). ? if ? the ? two ? time ? constants ? match, ? the ? voltage ? across ? c cs ? is ? proportional ? to ? the ? current ? through ? l, ? and ? the ? sense ? circuit ? can ? be ? treated ? as ? if ? only ? a ? sense ? resistor ? with ? the ? value ? of ? r l ? was ? used. ? the ? mismatch ? of ? the ? time ? constants ? does ? not ? affect ? the ? measurement ? of ? inductor ? dc ? current, ? but ? affects ? the ? ac ? component ? of ? the ? inductor ? current. ?? the ? advantage ? of ? sensing ? the ? inductor ? current ? versus ?? high ? side ? or ? low ? side ? sensing ? is ? that ? actual ? output ? current ? being ? delivered ? to ? the ? load ? is ? obtained ? rather ? than ? peak ?? or ? sampled ? information ? about ? the ? switch ? currents. ?? the ? output ? voltage ? can ? be ? positioned ? to ? meet ? a ? load ? line ? based ? on ? real ? time ? information. ? except ? for ? a ? sense ? resistor ? in ? series ? with ? the ? inductor, ? this ? is ? the ? only ? sense ? method ? that ? can ? support ? a ? single ? cycle ? transient ? response. ?? other ? methods ? provide ? no ? information ? during ? either ?? load ? increase ? (low ? side ? sensing) ? or ? load ? decrease ? (high ?? side ? sensing). ?? current ? sense ? amplifier ? a ? high ? speed ? differential ? current ? sense ? amplifier ? is ? located ? in ? the ? ir3535, ? as ? shown ? in ? figure ? 4. ? its ? gain ? is ? nominally ? 32.5, ? and ? the ? inductor ? dcr ? increase ? with ? temperature ? is ? not ? compensated ? inside ? the ? ir3535 ? and ? should ? be ? compensated ? in ? the ? voltage ? loop ? feedback ? path ? or ? inside ? the ? pwm ? controller. ? the ? current ? sense ? amplifier ? output ? iout ? is ? referenced ? to ? refin, ? which ? is ? usually ? connected ? to ? a ? reference ? voltage ? from ? the ? pwm ? controller. ?? the ? current ? sense ? amplifier ? can ? accept ? up ? to ? 25mv ? positive ? differential ? signal ? and ? up ? to ?\ 10mv ? negative ? differential ? signal ? before ? clipping. ? the ? output ? of ? the ? current ? sense ? amplifier ? is ? summed ? with ? the ? reference ? voltage ? at ? refin ? pin ? and ? sent ? to ? the ? pwm ? controller ? through ? iout ? pin. ? the ? current ? signal ? can ? be ? used ? for ? adaptive ? voltage ? positioning ? and ? over ? current ? protection. ? the ? input ? offset ? of ? this ? amplifier ? is ? calibrated ? to ? +/ \? 450uv ? in ? order ? to ? reduce ? the ? current ? sense ? error. ? the ? input ? offset ? voltage ? is ? the ? primary ? source ? of ? error ? for ? the ? current ? signal. ? in ? order ? to ? obtain ? very ? accurate ? current ? signal, ? the ? current ? sense ? amplifier ? continuously ? calibrates ? itself. ? this ? calibration ? algorithm ? creates ? ripple ? on ? iout ? with ? a ? frequency ? of ? f sw /128. ? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 12 ir3535 ? synchronous ? buck ? converter ? driver ? design ? procedures ? ? inductor ? current ? sensing ? capacitor ?? c cs ? and ? resistor ? r cs ? the ? dc ? resistance ? of ? the ? inductor ? is ? utilized ? to ? sense ? the ? inductor ? current. ? usually ? the ? resistor ? r cs ? and ? capacitor ? c cs ? in ? parallel ? with ? the ? inductor ? are ? chosen ? to ? match ? the ? time ? constant ? of ? the ? inductor, ? and ? therefore ? the ? voltage ? across ? the ? capacitor ? c cs ? represents ? the ? inductor ? current. ?? determine ? the ? inductance ? l ? and ? the ? inductor ? dc ? resistance ? r l ? based ? on ? measurement ? or ? the ? datasheet ? specifications. ? pre \ select ? the ? capacitor ? c cs ? and ? calculate ? r cs ? as ? follows: ? cs l cs c r l r = bootstrap ? capacitor ? c boost ? a ? minimum ? of ? 0.22uf ? 0402 ? 16vdc ? capacitor ? is ? required ? for ? the ? bootstrap ? circuit. ? a ? high ? temperature ? 0.22uf ? or ? greater ? value ? 0603 ? capacitor ? is ? recommended. ?? vcc ? and ? pvcc ? decoupling ? capacitor ? c vcc ? a ? 1uf ? ceramic ? decoupling ? capacitor ? is ? required ? at ? the ? vcc ? and ? pvcc ? pins. ?? body \ braking? ? feature ? the ? bbr# ? pin ? should ? be ? pulled ? up ? to ? vcc ? if ? the ? feature ? is ? not ? used ? by ? the ? pwm ? controller. ? use ? of ? a ? small ? value ? resistor ? or ? a ? direct ? connection ? to ? vcc ? is ? recommended. ? ?? downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 13 ir3535 ? synchronous ? buck ? converter ? driver ? metal ? and ? component ? placement ? ? lead ? land ? width ? should ? be ? equal ? to ? nominal ? part ? lead ? width. ?? the ? minimum ? lead ? to ? lead ? spacing ? should ? be ?? 0.2mm ? to ? minimize ? prevent ? shorting. ? ? lead ? land ? length ? should ? be ? equal ? to ? maximum ?? part ? lead ? length ? + ? 0.3 ? mm ? outboard ? extension ?? + ? 0.05mm ? inboard ? extension. ? the ? outboard ? extension ? ensures ? a ? large ? and ? inspectable ? toe ? fillet, ? and ? the ? inboard ? extension ? will ? accommodate ? any ? part ? misalignment ? and ? ensure ? a ? fillet. ? ? center ? pad ? land ? length ? and ? width ? should ? be ? equal ? to ? maximum ? part ? pad ? length ? and ? width. ?? however, ? the ? minimum ? metal ? to ? metal ? spacing ? should ? be ?? 0.17mm ? for ? 2 ? oz. ? copper ? ( ? 0.1mm ? for ? 1 ? oz. ? copper ? and ?? 0.23mm ? for ? 3 ? oz. ? copper) ? ? four ? 0.30mm ? diameter ? vias ? shall ? be ? placed ? in ? the ? center ? of ? the ? pad ? land ? and ? connected ? to ? ground ? to ? minimize ? the ? noise ? effect ? on ? the ? ic. ? ? no ? pcb ? traces ? should ? routed ? nor ? vias ? placed ? under ? any ? of ? the ? 4 ? corners ? of ? the ? ic ? package. ? doing ? so ? can ? cause ? the ? ic ? to ? raise ? up ? from ? the ? pcb ? resulting ? in ? poor ? solder ? joints ? to ? the ? ic ? leads. ? ? figure ? 11: ? metal ? and ? component ? placement ? * ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? your ? preferred ? format downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 14 ir3535 ? synchronous ? buck ? converter ? driver ? solder ? resist ? ? the ? solder ? resist ? should ? be ? pulled ? away ? from ?? the ? metal ? lead ? lands ? by ? a ? minimum ? of ? 0.06mm. ?? the ? solder ? resist ? miss \ alignment ? is ? a ? maximum ?? of ? 0.05mm ? and ? it ? is ? recommended ? that ? the ? lead ? lands ? are ? all ? non ? solder ? mask ? defined ? (nsmd). ?? therefore ? pulling ? the ? s/r ? 0.06mm ? will ? always ? ensure ? nsmd ? pads. ? ? the ? minimum ? solder ? resist ? width ? is ? 0.13mm. ? ? at ? the ? inside ? corner ? of ? the ? solder ? resist ? where ?? the ? lead ? land ? groups ? meet, ? it ? is ? recommended ?? to ? provide ? a ? fillet ? so ? a ? solder ? resist ? width ? of ?? ? 0.17mm ? remains. ? ? the ? land ? pad ? should ? be ? solder ? mask ? defined ? (smd), ? with ? a ? minimum ? overlap ? of ? the ? solder ? resist ? onto ? the ? copper ? of ? 0.06mm ? to ? accommodate ? solder ? resist ? miss \ alignment. ? in ? 0.5mm ? pitch ? cases ? it ? is ? allowable ? to ? have ? the ? solder ? resist ? opening ? for ? the ? land ? pad ? to ? be ? smaller ? than ? the ? part ? pad. ? ? ensure ? that ? the ? solder ? resist ? in \ between ? the ? lead ? lands ? and ? the ? pad ? land ? is ?? 0.15mm ? due ? to ? the ? high ? aspect ? ratio ? of ? the ? solder ? resist ? strip ? separating ? the ? lead ? lands ? from ? the ? pad ? land. ? ? the ? four ? vias ? in ? the ? land ? pad ? should ? be ? tented ? or ? plugged ? from ? bottom ? board ? side ? with ? solder ? resist. ? figure ? 12: ? solder ? resist ? ?* ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? your ? preferred ? format downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 15 ir3535 ? synchronous ? buck ? converter ? driver ? stencil ? design ? ? the ? stencil ? apertures ? for ? the ? lead ? lands ? should ? be ? approximately ? 80% ? of ? the ? area ? of ? the ? lead ? lands. ?? reducing ? the ? amount ? of ? solder ? deposited ? will ? minimize ? the ? occurrence ? of ? lead ? shorts. ?? since ? for ? 0.5mm ? pitch ? devices ? the ? leads ? are ? only ? 0.25mm ? wide, ? the ? stencil ? apertures ? should ? not ? be ? made ? narrower; ? openings ? in ? stencils ? < ? 0.25mm ? wide ? are ? difficult ? to ? maintain ? repeatable ? solder ? release. ? ? the ? stencil ? lead ? land ? apertures ? should ? therefore ? be ? shortened ? in ? length ? by ? 80% ? and ? centered ? on ? the ? lead ? land. ? ? the ? land ? pad ? aperture ? should ? be ? approximately ? 70% ? area ? of ? solder ? on ? the ? center ? pad. ?? if ? too ? much ? solder ? is ? deposited ? on ? the ? center ? pad ? the ? part ? will ? float ? and ? the ? lead ? lands ? will ? be ? open. ? ? the ? maximum ? length ? and ? width ? of ? the ? land ? pad ? stencil ? aperture ? should ? be ? equal ? to ? the ? solder ? resist ? opening ? minus ? an ? annular ? 0.2mm ? pull ? back ? to ? decrease ? the ? incidence ? of ? shorting ? the ? center ? land ?? to ? the ? lead ? lands ? when ? the ? part ? is ? pushed ? into ? the ? solder ? paste. ? figure ? 13: ? stencil ? design ? * ? contact ? international ? rectifier ? to ? receive ? an ? electronic ? pcb ? library ? file ? in ? your ? preferred ? format downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 16 ir3535 ? synchronous ? buck ? converter ? driver ? marking ? information ? ?? ? ? ? ? ?note ????????? : ? parts ? manufactured ? prior ? to ? date ? code ? 1304(yyww) ? on ? the ? packing ? label ? will ? not ? have ? the ? f ? marking ? on ? line ? 1 ? of ? the ? part ? marking. ? ? package ? information ? 16l ? mlpq ? (3 ? x ? 3 ? mm ? body) ? C ? ja ? = ? 38 o c/w, ? jc ? = ? 3 o c/w ? ? figure ? 14: ? package ? dimensions ? 1 ? ?f 3535m ywlc? date(yw)/lot(lc)/marking(?) ? code site ? code 1 downloaded from: http:///
march ? 13, ? 2013 ??? | ?? final ? datasheet 17 ir3535 ? synchronous ? buck ? converter ? driver ? data ? and ? specifications ? subject ? to ? change ? without ? notice. ? this ? product ? will ? be ? designed ? and ? qualified ? for ? the ? consumer ? market. ? qualification ? standards ? can ? be ? found ? on ? irs ? web ? site. ? ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information . www.irf.com downloaded from: http:///

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