34V Input Synchronous Step Down DC/DC Converter

34V Input Synchronous Step Down DC/DC Converter

Ricoh Europe has launched the high voltage step down DC/DC converter controller R1272 for general, industrial and automotive applications. The R1272 is especially designed as a power supply for core application processors used in set top boxes, media players, internet gateways and car infotainment/navigation systems. Such systems provide advanced functionalities and require a low operating voltage and high current power supply.

The R1272 has a wide input voltage range up to 34V and an adjustable output voltage from 0.7V to 5.3V. An additional external high side and low side NMOS transistor is required for the R1272 DC/DC Converter Controller. The total circuit is able to provide an output current up to a maximum of 20A. The oscillator frequency is adjustable in a range from 250kHz to 1MHz through the use of an external resistor and can be synchronized with an external clock when multiple DC/DC Converters are used in the power supply. The phase compensation can also be adapted through an external resistor and capacitor in order to do optimizations for the inductor and output capacitor. To improve efficiency performance under light load conditions, the R1272 is able to switch automatically from PWM into VFM mode, but can be set in a fixed PWM mode as well.

More information: Ricoh