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.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM5122 | HTSSOP (20) | 6.50 mm × 4.40 mm |
LM5122Z | HTSSOP (24) | 7.80 mm × 4.40 mm |
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Changes from May 1, 2017 to June 9, 2017
Changes from F Revision (May 2015) to G Revision
Changes from E Revision (December 2014) to F Revision
Changes from D Revision (September 2013) to E Revision
Changes from C Revision (August, 2013) to D Revision
Changes from B Revision (May, 2013) to C Revision
Changes from A Revision (May, 2013) to B Revision
Changes from * Revision (March, 2013) to A Revision