LTC7805RUFDM#PBF

LTC®7805 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. This operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase. The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. It features a precision 0.8V reference and power good output indicators. The MODE pin selects among burst mode operation, pulse-skipping mode, or continuous inductor current mode at light loads. Typical applications are transportation, industrial, military/avionics.

• PassThru™/100% duty cycle capable, spread spectrum operation, RSENSE or DCR current sensing
• Out-of-phase controllers reduce required input capacitance and power supply induced noise
• Selectable continuous, pulse-skipping or low ripple, Burst Mode® operation at light loads
• Power good output voltage monitors, internal LDO powers gate drive from VIN or EXTVCC
• Total input supply current in regulation is 14µA typ (front page circuit, 14V to 3.3V, RUN2=0V)
• Feedback current is ±50nA maximum
• VIN shutdown current is 1.5µA typical (RUN1,2=0V)
• 28-lead plastic QFN package
• Temperature rating range from -40°C to 150°C

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