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Fuel gauge cuts quiescent current by 4x

Posted: 04 Jan 2013  Print Version  Bookmark and Share

Keywords:fuel gauge  Li-ion batteries  Bluetooth  Wi-Fi 

Maxim Integrated Products Inc. has unveiled what it boasts as the industry's simplest low-power fuel gauge for Lithium-ion batteries. The MAX17048 operates at 23µA and claims to use 4x less power than competitive devices and even less in micropower hibernate mode, in which the fuel gauge continues to operate, noted the company.

According to the firm, the device needs only one external capacitor, not the multiple external devices of competitive devices, so it simplifies designs, shrinks solution size by 3x and reduces costs. This fuel gauge is geared for portable battery-powered applications where size, cost and power are critical such as smartphones, wireless handsets and mobile accessories including Bluetooth headsets, portable speakers, fitness devices and Wi-Fi routers, detailed Maxim.

Traditional fuel gauge designs require multiple external components including current-sense resistors, which increase both BOM cost and design complexity. Those fuel gauges also use coulomb counting, which can drift and affect the accuracy of the gauge over time. The MAX17048 features the proven ModelGauge algorithm and does not require coulomb counting to report accurate battery state-of-charge, thus extending runtime. The MAX17048 functionality is also integrated into the company's TINI Power system-on-chip to make it easier to upgrade designs to more complex systems, Maxim added.

The MAX17048 is now sampling and is available in an 8-bump WLP package (0.9 x 1.7mm) and an 8-pin TDFN package (2 x 2mm). Pricing starts at $1.12 (1000-up, FOB USA).





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