Nordic’s nPM2100 is a primary-cell PMIC built to squeeze long life out of AA/AAA, Li-MnO₂ and coin-cell powered Bluetooth LE devices. It integrates a high-efficiency boost plus a post-regulation LDO/load-switch so a single AA can provide a clean 1.8–3.3 V rail to parts like the nRF54L15, while system telemetry (voltage/temperature) feeds a model-based fuel gauge for reliable state-of-charge reporting in percent. Configuration and supervision run over I²C/TWI with minimal firmware burden, making it practical for compact sensors, remotes and beacons that need predictable maintenance windows. https://www.nordicsemi.com/Products/nPM2100
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The PMIC’s power path is tuned for ultra-low idle and solid conversion at tiny loads: Nordic quotes ~89% boost efficiency at 10 µA and up to ~95% at higher currents, helping avoid throwing away primary-cell energy during quiescent stretches. For deployment and storage, Ship mode drops to ~35 nA so products can ship with batteries inserted. In the field, Hibernate hits ~175 nA with a programmable wake timer, enabling long sleep intervals between advertising or sensing bursts without losing state across cycles.
Beyond regulation, nPM2100 adds system management that embedded teams usually bolt on separately. A watchdog timer, boot timer and power-fail warning let firmware checkpoint, do a final uplink, and shut down gracefully below a defined voltage threshold. The fuel-gauge workflow (battery profiling via Nordic’s PowerUP tools) yields percent-level SoC and—in the demo—reporting in 5% steps, which is often sufficient for maintenance planning across varied chemistries and vendors.
In practice, this means multi-year lifetimes are realistic for low-duty-cycle endpoints once sleep intervals exceed roughly 85 s, with 2–3× extensions reported for beacon-style workloads. The evaluation kit shows a single AA driving an nRF54-series board at a steady 3 V, and the same architecture works for CR2032 and zinc-air/silver-oxide stacks where cold-start and end-of-life behavior typically bite. This interview and live demo were filmed at Embedded World North America, focusing on nPM2100’s fit for coin-cell and alkaline-powered IoT nodes rather than rechargeable wearables, emphasizing predictable lifespan and simple integration for BLE endpoints.
Nordic Semiconductor nPM2100 PMIC, boost regulator, fuel gauging, hibernate 175 nA, ship mode, I²C, LDO, nRF54L15, AA/AAA, CR2032, watchdog, power-fail cutoff, timed wake, primary-cell BLE design
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