LTC3729EG#PBF

LTC3729 is a multiple phase, synchronous step‑down current mode switching regulator controller that drives N‑channel external power MOSFET stages in a phase‑lockable fixed frequency architecture. The PolyPhase controller drives its two output stages out of phase at frequencies up to 550KHz to minimize the RMS ripple currents in both input and output capacitors. The output clock signal allows expansion for upto 12 evenly phased controllers for systems requiring 15A to 200A of output current. The multiple phase technique effectively multiplies the fundamental frequency by the number of channels used, improving transient response while operating each channel at an optimum frequency for efficiency. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required for high current applications. It is used in applications such as desktop computers/servers, large memory arrays, DC power distribution systems etc.

• Wide VIN range is 4V to 36V operation
• Reduces required input capacitance and power supply induced noise
• ±1% output voltage accuracy, true remote sensing differential amplifier
• PolyPhase® extends from two to twelve phases
• Reduces the size and value of inductors, current mode control ensures current sharing
• OPTI-LOOP® compensation reduces COUT, power good output voltage indicator
• Very low dropout operation: 99% duty cycle, adjustable soft-start current ramping
• Internal current foldback plus shutdown timer, overvoltage soft-latch eliminates nuisance trips
• Operating ambient temperature is -40°C to 85°C
• Package style is 28-lead plastic SSOP

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