L9915B

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The L9915B is an advanced ultra low stand by current boost converter controller application. It is designed for space-restricted applications and to work in low-input voltage range. The device is ideal for battery-powered applications and provides a means of efficiently running a single cell lithium battery which allows current level below 1µA in the stand-by mode. As such, the L9915B belongs to a family of Power Management Integrated Circuits (PMICs) that specialize in techniques that enable the effective management of power. This article discusses the application field and working principle of the L9915B.

Application Field

The L9915B is a versatile device and can be used to control a wide variety of applications. It is suitable for both portable and permanent applications. With its low stand by current, it is well suited for applications that require a very low power consumption when not in use, such as watches and remote control devices. It also lends itself to uses in consumer products where energy efficiency is a concern.

The device also has a wide range of input voltage range, from 0.2V up to 6V, enabling it to be used with a variety of power sources including battery sources, AC/DC adapters, and solar panel sources. This makes it perfect for applications where multiple power supply solutions are required. In addition, the L9915B has a low operating current demand of typically only 25µA, making it well suited for battery-powered applications such as wearable and mobile devices.

Working Principle

The L9915B is a boost converter with two integrated N-channel MOSFETs allowing for output voltages up to 30V. The device is controlled by a tiny 8-bit processor typically using the I2C communications protocol. As such, it provides a high degree of flexibility and control in an extremely small package. The device allows a designer to adjust the converter efficiency by changing the MOSFET gate voltage, input voltage and output voltage.

The device\'s boost circuit consists of two modes: normal and low stand by mode. In normal mode, the device runs at its normal efficiency, where the input voltage is continuously regulated and the output voltage is limited by an integrated current limiter. In the low stand by mode, the device enters a sleep state, where the input voltage is chopped, resulting in lower stand-by current. The output voltage is then regulated by a feedback loop, with the output current automatically adjusting along with it.

The L9915B includes a host of design features that make it perfect for efficient power management. It includes short-circuit protection, over temperature protection and brown-out protection to ensure that the device performs optimally in all conditions. Additionally, the device has an undervoltage lockout feature, preventing it from operating with an input voltage below its specified minimum voltage.

Conclusion

The L9915B is an advanced ultra low stand-by current boost converter controller that is designed specifically for space-restricted applications. Its wide range of input voltage and extremely low stand by current make it the ideal device for portable and low-power applications such as wearables and mobile devices. In addition, its advanced features such as undervoltage lockout and over temperature protection make it well suited for demanding power management applications.

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