Power Electronics

Fully Integrated Li-Ion Battery Charger

ON Semiconductor has introduced a fully programmable Lithium- Ion switching battery charger optimized for power efficiency in smart phones, tablets and other handheld devices. The NCP1851 significantly reduces charge time, increases battery life and includes advanced startup features.

With 1.6 A charging capability, the device is perfectly sized at 2.2 x 2.55 mm for the latest USB compliant input supplies and large battery capacities and can complete a full charge cycle of a 1650 mAh, 4.2 V Li-Ion battery in 90 minutes.

The NCP1851 integrates dynamic power path management which enables instant system turn-on in case of a weak battery and helps replenish a deeply discharged battery. Both the device's internal junction temperature sensor and external Negative Temperature Coefficient (NTC) thermistor ensure safe charging of the system by reporting dedicated interrupts to the i²C Control Bus. The NCP1851 provides a USB On-the-Go (OTG) mode that boosts battery voltage to power accessories plugged into the USB port, eliminating the need for another step-up converter.

The NCP1851 is housed in a 25 bump Flip-Chip CSP package case with overall dimensions of a mere 2.2 mm x 2.55 mm and height of 0.6 mm maximum. The device is priced at $1.25 per unit in 3,000 quantities.

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