The LM5122 is a multi-phase capable synchronous boost controller intended for
high-efficiency synchronous boost regulator applications. The control method is based upon
peak-current-mode control. Current-mode control provides inherent line feed forward, cycle-by-cycle
current limiting, and ease of loop compensation.
The switching frequency is programmable up to 1 MHz. Higher efficiency is
achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A
user-selectable diode-emulation mode also enables discontinuous-mode operation for improved
efficiency at light load conditions.
An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass
operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration.
Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit,
and adjustable line undervoltage lockout.