描述 Description

The MAX14918 and MAX14918A are quad 700mA lowsideswitches for industrial applications. Each devicefeatures four 140mΩ (typ) on-resistance (RON) switcheswith integrated ±1.2kV/42Ω surge protection. Two ormore outputs can be connected in parallel to providehigher load current.

The maximum load current is actively limited and isresistor settable between 100mA (typ) and 900mA (typ).For load that draws high inrush current, the MAX14918and MAX14918A have the inrush mode which provides2x current after switch turn-on for 10ms (min).The MAX14918 has an SPI allowing control of multipleMAX14918 devices through a common daisy-chainedinterface for high channel-count applications, minimizinggalvanic isolation channels. Per-channel diagnostics arereturned on the serial data output (SDO). Datacorruption on the serial data input (SDI) is automaticallydetected and signaled on the SPIFLT output.

The MAX14918A offers a pin-based switch control witha latch option (LATCHEN) which allows sharing of thefour IN_ control signals among multiple MAX14918Adevices.

Slew rate control provides controlled turn-on edge forreducing electromagnetic interference or EMI emissions.Simultaneously, a global DIS control signal allowsdisabling of all OUT_ switches quickly.

The integrated 5V low dropout (LDO) regulator in theMAX14918 and MAX14918A can be used to powerexternal isolators or other logic circuitry.

特性 Features

+5V (V5) or +7V to +65V (VDD) Supply Voltage Operation
700mA DC Capability Per Channel across Temperature Range
140mΩ (typ) On-Resistance Per Channel
Settable Load Current Limit 100mA (typ) to 900mA (typ)
+5V to +48V Load Voltage Range
2x Inrush Load Current Option for 10ms (min)
Robust Design Features
Internal Inductive Energy Clamp at +55V (typ)
Short-Circuit Protection at OUT_ of up to +49V

Reverse Current Detection against Load-Supply Miswiring
±1.2kV/42Ω Surge Protection
±8kV Contact and ±25kV Air-Gap ESD Protection
-40°C to +125°C Operating Ambient Temperature
Diagnostic FAULT Indication for
Thermal Overload
Reverse Load Current Detection
Undervoltage Lockout (UVLO) on V5 Supply
Compact 24-Pin, 4mm x 5mm TQFN Package

應用 Application

Industrial Digital Outputs
Relay and Solenoid Drivers
Programmable Logic Controllers and Distributed Control Systems
Motor Control
Industrial/Process/Building Automation