1 Features

• Four-channel integrated low-side switches

– 235mΩ RDS(ON) at 25°C

– Output Stage 55V operating max (60V abs

max)

– Integrated catch diodes for flexible decay

(external TVS/Zener) as alternate current path

on switch turn-off

• Parallel interface for fast switching up to 250kHz

• Fully protected

– User settable current limit

– Independent overtemperature, overcurrent

protection for each switch

– Configurable over-current cut-off duration

(COD)

• Diagnostic feedback

– MCU fault interrupt signal(nFAULT)

• 4.5V to 55V operating supply voltage range

• Thermally enhanced surface mount package

(PWP20)

2 Applications

• PLC

• Distributed I/O

• General relay and solenoid drive

• Textile machines

3 Description

The DRV81545 is a four-channel low-side switch

driver that operates from 4.5V to 55V and supports

a wide range of load currents. The device integrates

four low-side switches with a RDS(on) of 235mΩ, each

with a freewheeling diode to the VCLAMP pin. This

feature allows the user to either recirculate current or

connect an external TVS for inductive load turn-off.

The device can be controlled through a hardware

GPIO interface. Each channel features individual

overtemperature protection, and an analog current

limit adjustable with an external resistor on the ILIM

pin. There is an optional cut-off duration (COD)

configuration which limits the duration of a currentlimiting

condition on the respective channel, helping to

prevent damage to the device or the load. Faults are

indicated on a fault output pin (nFAULT).