DC-DC converter integrates IoT battery monitor

April 09, 2020 //By Nick Flaherty
Buck-boost DC-DC converter integrates IoT battery monitor
Ricoh's RP605 buck-boost DC-DC converter integrates a simple battery voltage monitor to measure the remaining charge left in the battery

Ricoh Electronic Devices in Japan has launched a buck-boost DC-DC Converter with an integrated battery voltage monitor for IoT designs to measure the remaining charge left in the battery.

The RP605 is aimed at applications in the Internet of Things (IoT), wearable devices and wireless communications modules that need a low level of current consumption to extend battery life.

The additional battery monitor circuit avoids the need for an external resistor divider and MOSFET connected to an A to D converter. This typically has allow input impedance that leads to considerable current flow to ground, draining the battery and limiting the lifetime of the application.

The RP605 provides a simple solution with a built-in resistor divider and voltage follower as a buffer. This means there is much less current flow to ground and the output is compatible with the input impedance of the A to D converter.  The quiescent current of this circuit is only 100 nA and has an additional chip enable pin (CE2) instead of using a discrete MOSFET.

All the essential components for this circuit are integrated into the chip, reducing the footprint on the board for a simple fuel gauge for primary batteries in IoT designs.

The RP605 is particularly well suited when a supply voltage is required and located somewhere in between the voltage level of a fully charged and fully discharged battery. At a certain moment the DC-DC Converter switches over from Buck to Boost mode automatically in order to maintain the output voltage setting.

The RP605 is designed for applications that are mainly in sleep mode and wake-up periodically to perform a measurement, transmit data and then return to sleep mode. For this type of applications, the current consumption in sleep mode should remain as low as possible. The RP605 has an impressive low quiescent current and consumes only 300 nA (DC-DC Converter part), prolonging battery life or makes it possible for the

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