Programmable PMIC eliminates external voltage-setting resistors and pre-regulation

May 13, 2019 //By Nick Flaherty
STMicroelectronics has launched a seven-output automotive power management IC (PMIC) for automotive vision systems using direct operation from battery voltage with register-programmable output voltages and sequencing and integrated functional-safety mechanisms.
STMicroelectronics has launched a seven-output automotive power management IC (PMIC) for automotive vision systems using direct operation from battery voltage with register-programmable output voltages and sequencing and integrated functional-safety mechanisms.

The seven regulated outputs means a single L5965 PMIC can power an entire camera- or radar-based driver-assistance system including the sensors, memory ICs, processor, and CAN interface circuitry. One-time programmable (OTP) cells for setting the output voltages and sequencing give flexibility to configure the PMIC for a wide variety of Advanced Driver Assistance Systems (ADAS) and other in-car applications.

The ability to operate directly from the vehicle battery allows the L5965 to be used without a pre-regulator. The register-programmable outputs also eliminate voltage-setting resistors, and the on-chip regulators can be used without external compensation circuitry.  While reducing both footprint and bill of materials, these savings in external components also increase system reliability and enhance accuracy by eliminating fluctuation due to environmental effects on external components.

The pre SMPS BUCK1 regulator controller runs at 0.4 MHz while the BUCK2 regulator runs @ 3 A and 2.4 MHz. Post SMPS, the BUCK3 regulator runs at 1.5 A, 2.4 MHz and BUCK4 at 1 A, 2.4 MHz. The boost regulator operates at 300mA with the post linear regulator LDO running at 600 mA. There are programmable slew rate/soft start options and the device uses spread spectrum clocks to minimise EMI.

The integrated functional-safety features are designed in compliance with ISO 26262 and enable systems to fulfil Automotive Safety Integrity Level (ASIL) requirements up to ASIL-D. The mechanisms include a failure status pin, voltage monitors, ground-loss comparators, analog and digital Built In Self-Test (BIST), and temperature monitors. The PMIC operates at an operating ambient temperature of -40 to 125 °C with a thermal shutdown junction temperature of 175 °C and is qualified to the AEC Q100 standard.

ST is ramping up production of the L5965 and samples are available now in a small and low-cost 7mm x 7mm QFN48 package that requires no heatsink. Pricing starts at $3.59 for orders of 1000 pieces.

www.st.com

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