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R1278 Series of 36V Synchronous Step-Down DC/DC Converters with Built-in Drivers for Automotive and Industrial Applications

R1278 36V Synchronous Step-Down DC/DC Converters
R1278 36V Synchronous Step-Down DC/DC Converters

Ricoh Electronic Devices has introduced the R1278 series, a 36V maximum rated synchronous step-down DC/DC converters with built-in drivers for both automotive and industrial applications. This new device has an operating frequency at 2 MHz and efficiency of 87% and maintains the output voltage constant when there is a drop in input voltage by reducing a switching frequency to the minimum of 1/4. The Interference effect of the AM band is small as the devices achieve EMI noise reduction by using a spread spectrum clock generator.


Features of R1278 Series

  • Input Voltage Range (Maximum Ratings): 3.6 V to 30 V (36 V) Operating Temperature Range: −40°C to 125°C
  • Start-up Voltage: 4.5 V
  • Standby Current: Typ. 4 µA
  • Output Voltage Range: 3.3 V to 5.0 V
  • Feedback Voltage: 0.64 V ±1.0%
  • External Synchronous Clock Frequency: 1.8 MHz to 2.2 MHz
  • Thermal Shutdown: Tj = 160°C


Note: More technical information can be found in the R1278S Datasheet linked at the bottom of this page and on the R1278 Converters product page.

Component Datasheet

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