MC34911BACR2

MC34911BACR2 Application Field and Working Principle

The MC34911BACR2 device from STMicroelectronics is an advanced power management IC (PMIC) that offers multiple integrated features for system level design flexibility. The device is specialized for long term battery powered applications, providing a full range of power management functions to simplify the design of such systems.

Application Field

The MC34911BACR2 is intended for portable equipment and is optimized for use with a Li-Ion battery including cell temperature monitoring, and wide-input voltage range (VINmin=2.5V/VINmax=20V). It offers various powersaving features in addition to the low power consumption in run mode. Its built-in flashlight driver supports continuous and PWM dimming modes.

This device complements its wide input voltage range with efficient DC-DC power conversion, conserving battery life for long-term operations. A safety timer is included for short circuit protection and overvoltage protection, with two ADCs for monitoring VBAT and VOUT. An input voltage regulation function prevents damage from high voltage fluctuations and a soft start function prevents ripple current. In addition, an accurate temperature monitor is included, with a low quiescent current that is necessary to improve battery life.

Working Principle

When the MC34911BACR2 device is powered up, the accurate temperature monitor monitors the cell temperature of the Li-Ion battery and disables further operations when a predetermined over-temperature threshold is reached. The added function of the flashlight driver enables dimming and mode switching with just one P-channel MOSFET.

The MC34911BACR2 device also offers protection against input voltage and current changes. It features input voltage regulation to compensate for high-voltage fluctuations and its overvoltage protection puts a definite limit on the allowed output voltage level. The device also provides short-circuit protection to limit voltage and current due to over-current conditions. Furthermore, it provides reverse current protection and a soft start function to minimize the impact of large current draw from the battery.

The advanced power management features of the MC34911BACR2 deliver long-term and reliable performance for battery-powered applications. With complete flexibility in power management, it simplifies system designs, reduces development time, and extends battery life. Along with its advanced protection measures, the device ensures a safe and efficient power management system.