june ? 30 t h , ? 2011 ? | ? preliminary datasheet ? | ? v2.12 1 IR3553 40a ? integrated ? powirstage tm ? features ? ? peak ? efficiency ? up ? to ? 93.8% ? at ? 1.2v ? ? integrated ? driver, ? control ? mosfet, ? synchronous ? mosfet ? and ? schottky ? diode ? ? input ? voltage ? (vin) ? operating ? range ? up ? to ? 15v ? ? output ? voltage ? range ? from ? 0.25v ? up ? to ? 3.3v ? ? output ? current ? capability ? of ? 40a ? ? operation ? up ? to ? 1.0mhz ? ? integrated ? current ? sense ? amplifier ? ? vcc ? under ? voltage ? lockout ? ? thermal ? flag ? ? body \ braking? ? load ? transient ? support ? ? diode \ emulation ? high ? efficiency ? mode ? ? compatible ? with ? 3.3v ? pwm ? logic ? and ? vcc ? tolerant ? ? compliant ? with ? intel ? drmos ? v4.0 ? ? pcb ? footprint ? compatible ? with ? ir3550 ? ? ? ir3551 ? ? efficient ? dual ? sided ? cooling ? ? small ? 4mm ? x ? 6 ? mm ? x ? 0.9mm ? pqfn ? package ? ? lead \ free ? rohs ? compliant ? package ? applications ? ? high ? frequency, ? low ? profile ? dc \ dc ? converters ? ? voltage ? regulators ? for ? cpus, ? gpus, ? and ? ddr ? memory ? arrays ? ? basic ? application ? ? ? figure ? 1: ? IR3553 ? basic ? application ? circuit ? description ? the ? IR3553 ? integrated ? powirstage? ? is ? a ? synchronous ? buck ? gate ? driver ? ic ? with ? co \ packed ? control ? and ? synchronous ? mosfets ? and ? schottky ? diode. ? it ? is ? optimized ? internally ? for ? pcb ? layout, ? heat ? transfer ? and ? driver/mosfet ? timing. ? custom ? designed ? gate ? driver ? and ? mosfet ? combination ? enables ? higher ? efficiency ? at ? lower ? output ? voltages ? required ? by ? cutting ? edge ? cpu, ? gpu ? and ? ddr ? memory ? designs. ?? up ? to ? 1.0mhz ? switching ? frequency ? enables ? high ? performance ? transient ? response, ? allowing ? miniaturization ? of ? output ? inductors, ? as ? well ? as ? input ? and ? output ? capacitors ? while ? maintaining ? industry ? leading ? efficiency. ? the ? IR3553?s ? superior ? efficiency ? enables ? smallest ? size ? and ? lower ? solution ? cost. ? the ? IR3553 ? pcb ? footprint ? is ? compatible ? with ? ir3550 ? (60a), ? and ? the ? ir3551 ? (50a). ? integrated ? current ? sense ? amplifier ? achieves ? superior ? current ? sense ? accuracy ? vs. ? best \ in \ class ? controller ? based ? inductor ? dcr ? sense ? methods. ? the ? IR3553 ? incorporates ? the ? body \ braking? ? feature ? which ? enables ? reduction ? of ? output ? capacitors ? and ? is ? activated ? quickly. ? synchronous ? diode \ emulation ? mode ? in ? the ? IR3553 ? removes ? the ? zero \ current ? detection ? and ? control ? burden ? from ? the ? pwm ? controller ? and ? increases ? system ? efficiency. ? the ? IR3553 ? is ? optimized ? specifically ? for ? cpu ? core ? power ? delivery ? in ? server ? applications. ? the ? ability ? to ? meet ? the ? stringent ? requirements ? of ? the ? server ? market ? also ? makes ? the ? IR3553 ? ideally ? suited ? to ? powering ? gpu ? and ? ddr ? memory ? designs. ? ? 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 output ? current ? (a) efficiency ? (%) 0 4 8 12 16 20 power ? loss ? (w) ? figure ? 2: ? IR3553 ? efficiency ? and ? power ? loss ? www.datasheet.co.kr datasheet pdf - http://www..net/
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