· Integrated 4-switch for high efficient synchronous Buck-Boost converter
· Input bulk capacitance discharging during power swap at VPIN pin
· Input voltage operating range from 4V to 23V
· Adjustable switching frequency: 300kHz~500kHz
· Internal fixed soft-start time
· Internal high voltage bias regulator with bypass switch
· Selectable FCCM or DCM with pulse skipping
· Cycle-by-cycle current limit
· Up to 4A average inductor current
· Output over-voltage protection
· Thermal shutdown
· QFN-28 package, 4mm×4mm
The TMI2605S integrates a synchronous 4-switch Buck-Boost converter that maintains output voltage regulation when the input voltage is either less than or greater than the output voltage. It operates as a Buck converter while the input voltage is sufficiently greater than the output voltage and gradually transitions to the Buck-Boost mode as the input voltage approaches the output. It also features an internal fixed soft-start function and offers protection features including input UVLO, OCP, overload protection (OLP), OVP and thermal shutdown. In addition, it features selectable FCCM or DCM operation for light load.
The TMI2605S also control two low N-MOSFETs as load switches helping to reduce BOM cost. With a micro-processor, it can realize input bulk capacitance discharging during power swap at VPIN pin.
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