Claimed to be the industry’s first single-chip with integrated fuel gauge, the bq27741 uses Texas Instruments’ Impedance Track monitoring algorithm to boost battery run-time. It can be used in space-constrained consumer and portable industrial and medical devices.

The device measures just 1.9x2.7x0.6mm and packaged in a 15-bump, CSP (chip scale package). It monitors and protects single-cell Li-Ion batteries, with what the company describes as high-accuracy fault detection and shutdown circuitry for better safety margins, including the use of full-cell voltage and charging range without false trips. It has integrated high-side NFET protection and impedance track algorithms which report remaining battery capacity, status and charge voltage.

The use of a high-side sense resistor allows the use of one common ground plane and removes offset and noise, to simplify layout, reduce cost and save board space.