2A Bidirectional Backup Power Supply Ltc3643

Ltc3643 is a bidirectional synchronous step-up charger and step-down converter, which can effectively charge a capacitor array up to 40V with an input power supply with a voltage between 3V and 17V. When the input power falls below the programmable power failure threshold, the boost charger operates in reverse as a Synchronous Step-Down regulator to supply power to the system voltage rail from the backup capacitor in case of power failure / failure.

When charging the backup capacitor, an external low detection resistor can be used to maintain an accurate current limit (for the current from the input power supply) or execute the power path (powerpath) â„¢) Function.

The buck converter operates at a switching frequency of 1MHz, thus allowing the use of small external components. The low quiescent current during regulation can minimize the power consumption of the backup capacitor.

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