The LM5122 is a multiphase 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
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.
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