Description

The L9524C is a control IC for up to six glow plugs of diesel engines. The glow plugs are switched by up to four external PWM-controlled N-channel Power MOSFETs or a single relay in high-side configuration.

Supply voltage, battery voltage, junction temperature, switches, currents through the glow plugs, and charge pump voltage are monitored.

A two-wire interface is used to communicate with the diesel engine management system.

Features

■ Quad gate driver for external N-channel Power MOSFETs in high-side configuration:

   – Gates driven by PWM output signal

   – Adjustable gate charge/discharge currents

   – Limited gate-to-source voltages

   – Negative clamping for inductive loads

   – Advanced run-off control

   – Regulation of the power through the glow plugs

■ Control output for external relay driver

■ Battery-voltage-compatible two-wire interface

■ Supply voltage monitoring with shutdown

■ Battery voltage monitoring with shutdown

■ Junction temperature monitoring with shutdown

■ Monitoring of currents through the glow plugs with shutdown at overcurrent (adjustable threshold)

■ Monitoring of external switches

■ Charge pump voltage monitoring with shutdown

■ Active clamping during load dump