Power design for automotive applications

Posted by Ken Bloom on

Introducing AEC-Q100 qualified RT2875 family and its design tool Challenges when designing DC/DC power circuits for Automotive applications

Harsh automotive environment :

  • The input supply from the car battery can exhibit voltage dips and peaks during cranking or load dump events.
  • The nearby AM receiver is sensitive to switching noise, so switching converter EMI noise must be minimized.
  • The operating temperature range of the application can be much wider than normal commercial applications.
  • Automotive applications require high reliability and good safety protections.

Richtek has released new powerful DC/DC step-down converters and design tools that simplify the automotive power design considerably.

Introducing RT2875, a highly flexible automotive Buck converter family suitable for a wide range of automotive applications


Key features for RT2875:

  • AEC-Q100 Grade-2 qualified over -40 ~ +105°C temperature range.
  • The wide 4.5V ~ 36V input voltage range & 100% duty-cycle mode minimizes output voltage variation over input voltage fluctuation.
  • Programmable 300kHz ~ 2.1MHz clock which can be synchronized to an external clock for precise frequency setting to avoid sensitive frequency bands.
  • Programmable 1.5~6A current limit sets the maximum inductor peak current to a specific value, allowing optimal inductor choice without risk of saturation in overload condition.
  • External compensation to set feedback loop parameters and ensure stable operation at various switching frequencies over the full temperature range.
  • Low RDSON MOSFETs and a thermally efficient package allow operation at high ambient temperatures without overheating.

Richtek Designer™, online simulation tool for RT2875 family

The Richtek Designer™ online simulation tool greatly reduces the RT2875 application design time, does a fully automatic schematic generation based on Design Requirements and can be used to check various operating conditions such as:

  • Switching and output voltage during input voltage fluctuations
  • Start-up and shut-down sequence from VIN or Enable
  • Fast load transient test at different input voltages and switching frequencies
  • Current limit behavior during overload conditions
  • Gain phase analysis over a wide range of operating conditions
  • Efficiency and IC power dissipation analysis
  • Measure current and voltage of every circuit component; calculate average, RMS and peak values for component de-rating
  • Recommended component BOM generation

Find out more about Richtek Designer to get your automotive design started in no time.

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