LTC7803 Datasheet

• Low Operating I_Q: 12µA (14V V_IN to 3.3V V_OUT)
• Wide Input Voltage Range: 4.5V to 40V
• Output Voltage Up to 40V
• Spread Spectrum Operation
• R_SENSE or DCR Current Sensing
• PassThru^™/100% Duty Cycle Capable
• Programmable Fixed Frequency (100kHz to 3MHz)
• Phase-Lockable Frequency (100kHz to 3MHz)
• Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode^® Operation at Light Loads
• Low Shutdown I_Q: 1.2μA
• Thermally Enhanced 16-Pin 3mm × 3mm QFN and MSOP Packages
• AEC-Q100 Qualified for Automotive Applications

• Automotive and Transportation
• Industrial
• Military/Avionics
• Telecommunications

The LTC7803 is a high performance, 100% Duty Cycle Capable, synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803 operates from a wide 4.5V to 40V input supply range.

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. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7803 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.