Single cell battery boost switching regulator for 3.3V IoT applications

February 09, 2017 // By Graham Prophet
Recom's (Gmunden, Austria) Boost R-78S switching regulators have been designed for single-cell powered IoT applications. With wide input voltage range, high efficiency and low stand-by losses, they extend not only the working lifetime of the cell, but also maintain a stable 3.3V output down to the last from a battery.

Based on the plug-and-play concept of the standard R-78 buck regulator, the R-78S boost regulator is able to provide a stable 3.3 VDC output from a lower input voltage from 3.15V down to 0.65V.

Applications such as microcontrollers, WLAN / Bluetooth / LoRa modules or IoT systems can be supplied from a single 1.5V cell, which, in contrast to conventional 3V button batteries, offers considerably more power for a longer operational life.

The efficiency of the R-78S series can reach 93% at full load, and can maintain at over 90% even under light loading. No load current consumption is 160 μA, reducing to 7μA when the control pin is used.

The converters are protected against permanent short circuit and over-temperature conditions and have an under voltage lockout to protect rechargeable cells from deep discharge. They can be operated in ambient temperature range from -40°C up to +100°C and are certified to the new EN62368-1 standard.