LTC3728EUH#PBF

The LTC3728EUH#PBF is a dual, 2-phase synchronous step-down switching regulator controller designed by Analog Devices. It drives all N-channel synchronous power MOSFET stages and operates with a constant-frequency current mode architecture, allowing for phase-lockable frequencies up to 550kHz. This design minimizes power loss and noise by operating the two controller output stages out of phase.

The controller offers a wide input voltage range of 3.5V to 30V (36V maximum) and features OPTI-LOOP compensation for optimizing transient response. It includes a precision 0.8V reference and a power good output indicator. The RUN/SS pin on each controller provides soft-start and optional timed, short-circuit shutdown capabilities. Current foldback limits MOSFET dissipation during short-circuit conditions, and output overvoltage protection circuitry is included.

Available in a 32-pin QFN (5x5mm) package, the LTC3728EUH#PBF is suitable for surface mount applications. Its operating temperature range is -40°C to 85°C (TA). Key features include dual N-channel MOSFET synchronous drive, 99% duty cycle for very low dropout operation, and selectable operating modes (Burst Mode, constant-frequency, and PWM).

Applications for this regulator controller include notebook and palmtop computers, telecom systems, portable instruments, battery-operated digital devices, and DC power distribution systems. The dual 180° phased controllers help reduce required input capacitance and power supply induced noise.