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Automotive Electronics

Renesas PMIC Simplifies Power Supply Design for Surround View Camera Systems

Renesas Electronics Corporation announced the ISL78083, a highly integrated power management IC (PMIC) that simplifies power supply design for use in multiple HD camera modules, reducing development cycles, bill of materials (BOM) cost and supply chain risks. The automotive camera PMIC accepts direct-from-battery or power-over-coax supply sources and supports output currents up to 750mA per output.

This power level offers ample headroom for existing image sensors up to 7-megapixel and future sensors with even higher resolution. “The ISL78083 supports input voltages in the 4V to 42V range,” stated Edward Kohler, Strategic Marketing Manager at Renesas Electronics America.

“Power-over-coax (PoC) designs usually provide power to the PMIC that is typically in the range of 6-10V, but could be as low as 4.5V and as high 15 to 18V.  So, power-over-coax systems might be able to provide an input voltage to the PMIC of 8-18V, some might be 5-15V, and I’ve even seen designs that only provide a supply with a range around 4.5-8V.  Since the acceptable input range for ISL78083 is 4 to 42V, any of these power-over-coax examples would be supported.  In general, every PoC system will have slightly different supply characteristics, but the ISL78083 quad PMIC will support them,” Kohler added.

“Direct-to-Battery 12V designs usually provide power to the PMIC that is typically 12-14V, but can go as low as 6V and as high as 36 to 42V.  In order to work correctly, the PMIC must be able to tolerate the full min-to-max range.  Since ISL78083 is spec’d to support a range of 4 to 42V, it also can satisfy these direct-to-battery requirements,” concluded Kohler.

“The innovative ISL78083 PMIC expands Renesas’ support for automotive surround view camera systems beyond the image processing capabilities of the R-Car SoC and into the design of the HD satellite cameras,” said Niall Lyne, Senior Director, Automotive Business Unit at Renesas. “Cameras designed with the ISL78083 are smaller and can be conveniently mounted in vehicle locations that provide the desired surround view camera angles without negatively impacting style or aerodynamics.”

The feature-rich 4-channel ISL78083 automotive camera PMIC includes a primary high-voltage synchronous buck regulator, two secondary low-voltage synchronous buck regulators, and a low-dropout (LDO) voltage regulator. With integrated feedback and integrated compensation, all that is left to complete the high efficiency power supply is the output inductor and capacitors. The ISL78083 minimizes BOM cost, requiring 7-10 less external components compared to competing solutions.

The ISL78083 also features four overvoltage (OV) and four undervoltage (UV) monitors, three power-good indicators and a reset output/fault indicator. A second reference is supplied for the OV/UV monitors.

Key Features of ISL78083 Automotive Camera PMIC

  • Input voltage of 4V to 42V supports power-over-coax or direct from a 12V battery power source
  • Three buck regulators provide programmable output ranges from 1V to 5.05V, and the LDO supports 2.8V to 3.4V
  • 2MHz switching frequency avoids AM band interference and shrinks the required output capacitance and inductance
  • An optional spread spectrum feature addresses EMC/EMI interference challenges
  • Wettable flank package improves reliability of solder connections and enables optical inspection of solder joints for lower cost manufacturing
  • AEC-Q100 Grade-1 qualified for ambient operation from -40°C to +125°C, and junction temperature from -40°C to +150°C
Availability

Mass production quantities of the ISL78083 automotive camera PMIC are available now in a 4mm x 4mm, 24-lead SCQFN wettable flank package. More information on the ISL78083 and evaluation board is available here.