Voltage regulators target 48V automotive applications

November 13, 2017 //By Christoph Hammerschmidt
In the automotive industry, the 48V voltage level is increasing gaining acceptance and enables innovative applications – not only for mild hybrid and hybrid vehicles, but also for cars with a classical combustion engine. To satisfy the rising demand for electronic components in this market, Ricoh has developed two voltage regulators.

Today’s conventional car battery systems are reaching their limits due a continuously increasing integration level of electronic applications. This has led to strong market demands for power saving solutions. In response to this Ricoh developed the R1560, which has a focus on minimum current consumption (3.0 µA) to save the battery as much as possible. Meanwhile, the R1561 has an excellent transient response performance but consumes 20 µA.

The new R1560 and R1561 are operating at up to 60V and have an absolute maximum rating of 80V; they even tolerate load dump surge peaks up to 90V with duration of less than 200ms. The operating temperature range is from -40°C to 125°C. Connecting the regulator directly to the 48V battery eliminates the need for two-stage conversions resulting in a simple and cost effective solution.

Other key features are a high output voltage accuracy of 0.8% (at 25°C) and in combination of a low temperature drift coefficient of typical 100ppm/°C, it makes the device suitable as a high reliable power source.

A number of protection and safety circuits are embedded:

  • Fold-back current limit protection; decreases the output current in case of a short circuit.
  • Thermal protection; disables the voltage regulator in case of an over-temperature event.
  • Overcurrent protection; limits the output current when exceeding a maximum level.

The regulators use a PCB saving HSOP-6J and a high wattage TO-252-5-P2 package and product versions are available for automotive (AEC-Q100 compliant soon) as well as for industrial and consumer quality applications.