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RL9958：SPI controlled H-Bridge

The RL9958 is an SPI controlled H-Bridge, designed for the control of DC and stepper motors in safety critical applications and under extreme environmental conditions.

The H-Bridge is protected against over temperature, short circuits and has an undervoltage lockout for all the supply voltages V_sand V_dd, and for overvoltage on V_dd. All malfunctions cause the output stages to go tristate.

Detailed failure diagnostics on each channel is provided via SPI: short circuit to battery, short circuit to ground, short circuit overload, over temperature.

Open-load can be detected in ON condition, for the widest application ranges. Current regulation threshold can be set by SPI from 2.5 A to 8.6 A (Typ.), in 4 steps. Guaranteed accuracy is ±10 % on all temp range, using an external reference resistor with 1% accuracy over all temp range.

Current limitation threshold is linearly reduced by temperature over 165 °C.and a thermal warning bit is set by SPI. The H-Bridge contains integrated free-wheel diodes. In case of free-wheeling condition, the low side transistor is switched on in parallel of its diode to reduce power dissipation.

A multiple wire bonding technique, as well as ST proprietary package design is making RL9958 compatible with several power packages, for maximum flexibility:

PowerSO-20 package (medium power, JEDEC standard MO166.

Key Features

• Programmable current regulation peak threshold by SPI up to 8.6 A typ.
• Operating battery supply voltage 4.0 V to 28 V
• Operating Vdd supply voltage 4.5 V to 5.5 V
• All pins withstand 19 V, Vs and output pins withstand 40 V
• Full path Ron from 100 mΩ (at Tj = -40 °C) to 300 mΩ (at Tj =150 °C)
• Logic inputs TTL/CMOS-compatible
• Operating frequency up to 20 kHz
• 16-bit SPI interface for configuration/diagnostics, daisy chain capability
• Over temperature and short circuit protection
• VS undervoltage disable function
• Vdd undervoltage and overvoltage protection
• Vdd overvoltage detection
• Open-load detection in ON condition
• Full diagnostics in OFF state
• Enable and disable input
• Low stand by current (<10 μA)
• Voltage and current slew-rate control for low EMI, programmable through SPI
• Aerospace and Defense features
  • Dedicated traceability and part marking
  • Production parts approval documents available
  • Adapted Extended life time and obsolescence management
  • Extended Product Change Notification process
  • Designed and manufactured to meet sub ppm quality goals
  • Advanced mold and frame designs for Superior resilience to harsh environment (acceleration, EMI, thermal, humidity)
  • Single Fabrication, Assembly and Test site
  • Dual internal production source capability

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