Nordic Semiconductor’s nRF52/nRF53 series of SOC (System On Chip) devices embed a powerful ARM microprocessor and is compatible with Bluetooth Low Energy and other communication standards. This compatibility provides the freedom to develop your wireless system using the technology that suits your application the best. These SOCs are power efficient, allowing you to make ultra-low power wireless solutions. nRF53 series, moreover, provides security solutions and has extensive wireless protocol support, including Bluetooth 5.1 Direction Finding, Bluetooth 5 Long Range, NFC, Bluetooth Mesh, Thread, and Zigbee.

Dedicated to these Bluetooth Low Energy SOCs, Nordic Semiconductor announced the launch of its first power management IC (PMIC), the nPM1100. The PMIC consists of an input USB voltage regulator, 400mA battery charger, and 150mA DC/DC step-down converter in an extremely compact form factor. nPM1100 ensures reliable power supply and stable operation for Nordic’s nRF52 and nRF53 SOCs as well, for any application using rechargeable Lithium Ion or Lithium Polymer batteries. It can supply 3.3V to 5V unregulated voltage to any application at the maximum output current of 500mA. It aims to efficiently charge and power the applications and maximize the battery life.

The PMIC, just like any other power management device, draws its power from either the USB input or from the connected battery input. The input voltage regulator includes overvoltage protection for transient voltage spikes up to 20V.

The DC-DC step-down voltage regulator features an efficiency of 90% down to below 100µA load current. The output regulated voltage is selectable from 1.8, 2.0, 2.7, or 3.0V. The regulator features soft startup and automatic transition between hysteretic and pulse width modulation (PWM) modes. It also has a forced PWM mode (this mode allows reverse current from the inductor at light load) to ensure the cleanest power operation possible.

The battery charger is a three-stage charger. In the very first stage, a constant current is applied to the battery until it is 80% charged. In the second stage, the constant voltage is maintained across the battery, and the charging power continues to increase. In the final trickle charging state, a steady current is applied to maintain its fully charged level. The charger in the PMIC also features battery thermal protection and a discharge current limitation.


About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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