IM2605 TYPEC expansion dock power management chip

The IM2605 integrates a synchronous 4-switch Buck-Boost converter to maintain output voltage regulation when the input voltage is less than or greater than the output voltage. When the input voltage is sufficiently greater than the output voltage, it operates as a Buck converter and gradually transitions to Buck-Boost mode as the input voltage approaches the output. It also has an internal fixed soft-start function and provides protection functions including input UVLO, OCP, overload protection (OLP), OVP and thermal shutdown. In addition, it has selectable FCCM or DCM operation for light loads. The IM2605 also controls two low N-MOSFETs as load switches, which helps reduce BOM costs. With a microprocessor, input body capacitance discharge during power switching can be achieved.

IM2605 Features

⚫Integrated 4 switches for efficient synchronization

Buck-Boost Converter

⚫Input voltage operating range from 4V to 23V

⚫Adjustable switching frequency: 300kHz~450kHz

⚫Internal fixed soft start time

⚫Internal high voltage bias regulator with bypass conversion

⚫Selectable FCCM or DCM with pulse skipping

⚫Cycle-by-Cycle Current Limit

⚫Up to 8A peak current limit

⚫Average inductor current up to 4A

⚫Output overvoltage protection

⚫ Thermal shutdown

⚫ QFN-28 package, 4mm×4mm

IM2605 Applications

TYPEC docking station/extension base, USB power transmission, computer

Peripheral devices

IM2605 typical application circuit

IM2605 Pin Configuration