nPM2100 PMIC

Primary-Cell with ultra-efficient boost regulator and fuel gauge

The nPM2100 is a Power Management IC specifically engineered for primary-cell battery applications, addressing the unique power management requirements of non-rechargeable battery-powered products. It supports Alkaline AA/AAA/LRxx cells (up to two in series), 3 V LiMnO₂ coin cells (CR2032 and similar), single- or dual-cell silver oxide and zinc-air coin-cell batteries, or any primary battery within 0.7–3.4 V input range.

It features an ultra-efficient boost regulator, LDO and system management features and allowing it to operate from alkaline AA/AAA cells, 3 V lithium manganese dioxide (LiMnO₂) coin cells, and other primary batteries as they discharge from full voltage down to 0.7 V.

The nPM2100 includes an algorithm-based battery fuel gauge and a rich set of system management features including a hardware watchdog, hard reset, failed-boot recovery, break-to-wake, ship and hibernate mode. The nPM2100 is your toolbox of power saving capabilities replacing multiple discrete components while enabling greater design flexibility through a fully I²C-compatible TWI interface.

The nPM2100 included a unique mechanism to support short and high-peak burst currents without unnecessary wear on the battery

nPM2100 Datasheet [PDF | HTML]

Battery management

Supported battery types
- Alkaline AA/AAA/LRxx cells (up to two in series)
- 3 V LiMnO₂ coin cells (CR2032 and similar)
- Single- or dual-cell silver oxide and zinc-air coin-cell batteries
- Any primary battery within 0.7–3.4 V input range
- Fuel gauge
- State of charge

Voltage regulators

Boost regulator
- Output current: 150 mA
- Output voltage: 1.8 – 3.3 V
  - 50 mV steps
- Automatic switching between higher power, low power and ultra-low power modes, or pass-through mode
- Quiescent current: 150 nA
- Efficiency: up to 95% at 50 mA, 90.5% at 10 µA
LDOs / load switches
- Output current: 50 mA
- Output voltage: 0.8 – 3.0 V (LDO)
- 50 mV steps (LDO)

System management

Hard reset
Watchdog timer
Failed-boot recovery
Ship mode: 35 nA
Hibernate mode: 175 nA
Two GPIOs
I²C compatible TWI

Block diagram

Differentiated algorithm-based battery fuel gauge solution including battery health

Accurate fuel gauging is essential for any battery‑powered device, giving users clear and reliable insight into how much energy is left and helping avoid unexpected shutdowns.

Nordic’s fuel gauging provides accurate state of charge information for all supported battery types. Battery state of health is also supported for rechargeable batteries - tracking actual capacity and aging over time to understand how the battery performs throughout its lifetime. This deeper insight helps devices stay reliable for longer and makes rechargeable battery replacement more predictable.

By combining high accuracy with ultra‑low power operation - including zero power consumption in sleep - and low system cost, the Nordic algorithm-based fuel gauge solution delivers accurate battery information without extra components, licensing fees, or impact on battery life.