CH217
Overview
CH217 is a USB port power switch chip with adjustable current limiting threshold. The chip has integrated modules for over-current protection, over-temperature protection, and under-voltage protection, and supports programmable currents of up to 2.7A at 5V, which can limit the output current to protect the power supply system in the event of a short circuit at the VOUT output. The following is the internal block diagram of CH217 for reference only.
Current Sense
VOUT
UVLO
EN#
Current Limit
ISET
EN#
Driver
Deglitch OR
FLAG#
Thermal
Sense
2. Feature l Built-in power switching tube, typical 70mΩ on-resistance. l The current limiting threshold can be adjusted by external resistors, supporting 400m A to 2.7A with ±10% typical error. l Support power supply voltage 2.7V~5.5V. l Fast current limiting protection in case of output short circuit. l Low-power consumption, typical 50u A quiescent operating current. l Typical shutdown current is less than 1u A, with no...
