SCDS394A March 2021 – October 2021 TMUX7462F
The TMUX7462F operates across a wide supply range of ±5 V to ±22 V (8 V to 44 V in single-supply mode). The device also performs well with asymmetrical supplies such as VDD = 12 V and VSS= –5 V. For improved supply noise immunity, use a supply decoupling capacitor ranging from 1 µF to 10 µF at the VDD and VSS pins to ground. Always ensure the ground (GND) connection is established before supplies are ramped.
The fault supplies (VFP and VFN) provide the current required to operate the fault protection, and thus, must be low impedance supplies. They can be derived from the primary supplies by using a resistor divider and buffer or be an independent supply rail. The fault supplies must not exceed the primary supplies as it might cause unexpected behavior of the switch. Use a supply decoupling capacitor ranging from 1 µF to 10 µF at the VFP and VFN pins to ground for improved supply noise immunity.
The positive supply, VDD, must be ramped before the positive fault rail, VFP, for proper power sequencing of the TMUX7462F. Similarly, the negative supply, VSS, must be ramped before the negative fault voltage rail, VFN.