The nPM1100 is a dedicated power management IC (PMIC) with dual-mode configurable buck regulator and integrated battery charger. It is designed as a complementary component to Nordic’s nRF52® Series and nRF53® Series System-on-Chips (SoCs) to ensure reliable power delivery and stable operation, whilst maximizing battery life through high efficiency and low quiescent currents. It can also be used as a generic PMIC device for any other suitable application. Its extremely compact form factor makes it ideal for advanced wearables, connected medical devices, and other size constrained applications. PCB area usage can be as low as 23 mm2.
The integrated battery charger is designed to charge lithium ion and lithium polymer batteries to a termination voltage selectable to 4.1 or 4.2 V supporting cell chemistries with a nominal voltage of 3.6 and 3.7 V, respectively. It includes battery thermal protection and automatic selection of three charging modes: automatic trickle, constant current and constant voltage. The maximum charge current is resistor selectable from 20 mA up to 400 mA. The charger also features a discharge current limitation and is JEITA compliant.
The highly efficient step-down buck regulator can deliver up to 150 mA of current at a selectable output voltage of 1.8, 2.1, 2.7 or 3.0 V. It features soft startup and automatic transition between hysteretic and PWM modes. It also allows for forced PWM mode to ensure clean power operation.
The nPM1100 PMIC features a USB compatible system regulator that features USB port detection for SDP, CDP and DCP USB host-type ports supporting USB current limits of 100 mA and 500 mA, and a USB supply voltage ranging from 4.1 to 6.6 V. The system regulator features a 20 V overvoltage protection that allows for transient voltage peaks of up to 20 V. The regulator allows a system voltage output ranging from 3.0 to 5.5 V.
The typical quiescent current of the nPM1100 PMIC is 700nA in power off mode, which can be further reduced to 470 nA in “ship mode”. Ship mode also disables power output and thus removes the need for an external power switch.
The nPM1100 PMIC requires no software to operate and is compatible with all components that operates within the output voltages and power the PMIC can deliver, while charging lithium-ion and lithium-polymer batteries at 4.1 V or 4.2 V. The PMIC itself operates from either USB or other DC power (4.1 V to 6.6 V) or from a connected battery (2.3 V to 4.35 V).