L9524C STMicroelectronics

L9524C Glow plug system control IC 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 SO24 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 Description Battery voltage monitoring with shutdown The L9524C is a control IC for up to six glow Junction temperature monitoring with plugs of diesel engines. The glow plugs are shutdown switched by up to four external PWM-controlled Monitoring of currents through the glow plugs N-channel Power MOSFETs or a single relay in with shutdown at overcurrent (adjustable high-side configuration. threshold) Supply voltage, battery voltage, junction Monitoring of external switches temperature, switches, currents through the glow plugs, and charge pump voltage are monitored. Charge pump voltage monitoring with shutdown A two-wire interface is used to communicate with Active clamping during load dump the diesel engine management system. Table 1. Device summary Order code Package Packing L9524C SO24 Tube L9524C-TR SO24 Tape and reel September 2013 Rev 4 1/27 www.st.com 1Contents L9524C Contents 1 Block diagram 5 2 Pins description 6 3 Electrical specifications 7 3.1 Absolute maximum ratings . 7 3.2 Thermal data . 7 3.3 Electrical characteristics . 8 4 Functional description 12 4.1 Operating modes . 12 4.2 Supply . 13 4.3 Control input . 14 4.4 Diagnostic output . 15 4.5 Current monitoring 17 4.6 Switch monitoring . 18 4.7 Thermal shutdown 18 4.8 Gate drivers . 18 4.9 Relay output . 19 4.10 Gate charge/discharge current variation . 19 4.11 Overcurrent threshold variation 19 4.12 Advanced run-off control . 20 4.13 Output timing 20 4.14 Power regulation 21 5 Application diagrams . 22 6 Package information 25 7 Revision history . 26 2/27