What this 2-phase synchronous buck controller does for a power rail
The LTC1628IUH#TRPBF is a 2-phase, dual-output step-down (buck) switching regulator controller from Analog Devices. It drives external N-channel MOSFETs in a synchronous rectifier topology, meaning the low-side FET replaces the freewheeling diode for higher efficiency at the cost of a more complex gate-drive layout. Two outputs running 180° out of phase reduce input ripple current and let you share a single input capacitor bank — useful when pulling 10+ amps from a 12V or 24V backplane. The 220 kHz switching frequency keeps the inductor physically small while staying above the audible band.
Supply range, temperature grade, and control features
Input supply range is 3.5V to 30V on Vcc — covers standard 5V, 12V, and 24V industrial rails without an extra bias supply. Control features include Enable, Frequency Control, Power Good, and Soft Start. The 99.4% maximum duty cycle means the output can run very close to the input voltage — useful for a 3.3V rail from a 3.5V input with minimal dropout. Output configuration is positive, and the transistor-driver output type means you supply the external MOSFETs — the controller handles the gate drive timing and dead-time control.
Housed in a 32-WFQFN exposed pad package (5x5 mm body, supplier device package 32-QFN).
The part is catalogued under Discrete Semiconductors. No AEC-Q grade or specific automotive qualification is cited; the industrial temperature range suggests a general-purpose or telecom-grade application.