TMUX7462F datasheet(25/37 Pages) TI

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8 Detailed Description

8.1 Overview

The TMUX7462F is a four-channel protector that can be placed in series with the signal path to protect sensitive

components downstream from overvoltage faults. The channel protector prevents overvoltages in both powered

and powered-off conditions, making it suitable for applications where correct power supply sequencing cannot

be precisely controlled. The powered-off condition includes floating power supplies, grounded power supplies, or

power supplies at any level that are below the undervoltage (UV) threshold. The internal switch is turned-on and

turned-off autonomously based on the fault situation without the need of external controls, making the device

extremely easy to implement in the system. The primary supply voltages define the on-resistance profile, while

the secondary supply voltages define the voltage level at which the overvoltage protection engages. The device

works well with dual supplies (±5 V to ±22 V), a single supply (8 V to 44 V), or asymmetric supplies (such as VDD

= 12 V, VSS = –5 V).

8.2 Functional Block Diagram

Fault Detection/

Switch Driver

VDD

VSS

VFP VFN

GND

Input

Output

8.3 Feature Description

8.3.1 Flat ON-Resistance

The TMUX7462F are designed with a special switch architecture to produce ultra-flat on-resistance (RON) across

most of the switch input operation region. The flat RON response allows the device to be used in precision sensor

applications since the RON is controlled regardless of the signals sampled. The architecture is implemented

without a charge pump so no unwanted noise is produced from the device to affect sampling accuracy.

8.3.2 Protection Features

The TMUX7462F offers a number of protection features to enable robust system implementations.

8.3.2.1 Input Voltage Tolerance

The maximum voltage that can be applied to any source input pin is +60 V or -60 V, allowing the device to

handle typical voltage fault conditions in industrial applications. Take caution: the device has different maximum

stress ratings across different pin combinations and are defined as the following:

1. Between source pins and supply rails: 85 V

For example, if the device is powered by VDD supply of 25 V, then the maximum negative signal level on any

source pin is –60 V. If the device is powered by VDD supply of 40 V, then the maximum negative signal level

on any source pin is reduced to –45 V to maintain the 85 V maximum rating across the source pin and the

supply.

2. Between source pins and drain pin of the same channel: 85 V

For example, if the DR pin is left floating and an overvoltage voltage fault of –60 V occurs on the source pin

S1, then the maximum positive voltage signal level driven on the drain pin channel D1 is 25 V to maintain the

85 V maximum rating across the source pin and the drain pin.

www.ti.com

TMUX7462F

SCDS394A – MARCH 2021 – REVISED OCTOBER 2021

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