General Description

The MAX14918 and MAX14918A are quad 700mA lowside

switches for industrial applications. Each device

features four 140mΩ (typ) on-resistance (RON) switches

with integrated ±1.2kV/42Ω surge protection. Two or

more outputs can be connected in parallel to provide

higher load current.

The maximum load current is actively limited and is

resistor settable between 100mA (typ) and 900mA (typ).

For load that draws high inrush current, the MAX14918

and MAX14918A have the inrush mode which provides

2x current after switch turn-on for 10ms (min).

The MAX14918 has an SPI allowing control of multiple

MAX14918 devices through a common daisy-chained

interface for high channel-count applications, minimizing

galvanic isolation channels. Per-channel diagnostics are

returned on the serial data output (SDO). Data

corruption on the serial data input (SDI) is automatically

detected and signaled on the SPIFLT output.

The MAX14918A offers a pin-based switch control with

a latch option (LATCHEN) which allows sharing of the

four IN_ control signals among multiple MAX14918A

devices.

Slew rate control provides controlled turn-on edge for

reducing electromagnetic interference or EMI emissions.

Simultaneously, a global DIS control signal allows

disabling of all OUT_ switches quickly.

The integrated 5V low dropout (LDO) regulator in the

MAX14918 and MAX14918A can be used to power

external isolators or other logic circuitry.

Benefits and 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

Applications

• Industrial Digital Outputs

• Relay and Solenoid Drivers

• Programmable Logic Controllers and Distributed

Control Systems

• Motor Control

• Industrial/Process/Building Automation