Multiphase step-up DC/DC controller delivers high power
[2008-7-21]
Tag : 12V 5A
Multiphase step-up DC/DC controller delivers high power Linear Technology Corporation introduces the LTC3862, a 2-phasestep-up (boost) DC/DC controller that delivers high output power ina compact footprint. Up to 12 power stages can be paralleled andclocked out-of-phase to minimize input and output filteringrequirements. The 4V to 36V input voltage range and a wide outputvoltage range that is dependent on the choice of externalcomponents covers a broad range of high power boost applications.The LTC3862 can regulate a 48V at 5A output with up to 97%efficiency from an input source ranging from 12V to 36V using onlytwo-phases. Applications include high power audio amplifiers,automotive fuel injection systems, networking and industrial powersupplies.
Multiphase operation is enabled using the SYNC input, CLOCK outputand PHASEMODE control pin, allowing 2-, 3-, 4-, 6- or 12-phaseoperation. The LTC3862 utilizes peak current mode architecture foreasy loop compensation and multi-phase operation with excellentphase-to-phase current matching. The fixed operating frequency canbe set with a single resistor over a 75kHz to 500kHz range or canbe synchronized to an external clock using the internalphased-lock-loop over a 50kHz to 600kHz frequency range. A currentsense resistor is used in each phase to provide a precisecycle-by-cycle current limit. The powerful on-board CMOS gatedrivers minimize switching losses and allow the use of multipleMOSFETs in parallel for even higher current applications. Otherfeatures include an on-board 5V LDO that eliminates the need for abias voltage to power the IC, undervoltage lockout protection, aprecise RUN pin threshold with programmable hysteresis, adjustablesoft-start, programmable maximum duty cycle and user-adjustableleading edge blanking.
Multiphase step-up DC/DC controller delivers high power Linear Technology Corporation introduces the LTC3862, a 2-phasestep-up (boost) DC/DC controller that delivers high output power ina compact footprint. Up to 12 power stages can be paralleled andclocked out-of-phase to minimize input and output filteringrequirements. The 4V to 36V input voltage range and a wide outputvoltage range that is dependent on the choice of externalcomponents covers a broad range of high power boost applications.The LTC3862 can regulate a 48V at 5A output with up to 97%efficiency from an input source ranging from 12V to 36V using onlytwo-phases. Applications include high power audio amplifiers,automotive fuel injection systems, networking and industrial powersupplies.
Multiphase operation is enabled using the SYNC input, CLOCK outputand PHASEMODE control pin, allowing 2-, 3-, 4-, 6- or 12-phaseoperation. The LTC3862 utilizes peak current mode architecture foreasy loop compensation and multi-phase operation with excellentphase-to-phase current matching. The fixed operating frequency canbe set with a single resistor over a 75kHz to 500kHz range or canbe synchronized to an external clock using the internalphased-lock-loop over a 50kHz to 600kHz frequency range. A currentsense resistor is used in each phase to provide a precisecycle-by-cycle current limit. The powerful on-board CMOS gatedrivers minimize switching losses and allow the use of multipleMOSFETs in parallel for even higher current applications. Otherfeatures include an on-board 5V LDO that eliminates the need for abias voltage to power the IC, undervoltage lockout protection, aprecise RUN pin threshold with programmable hysteresis, adjustablesoft-start, programmable maximum duty cycle and user-adjustableleading edge blanking.
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