1-cell fuel gauge integrates an Li+ protector, SHA-1 authentication

Sunnyvale, Calif.—Maxim Integrated Products has introduced the DS2784, a fuel gauge that integrates a 1-cell Li+ protector and SHA-1 authentication in a tiny, 3mm x 5mm TDFN package.

Applications include space-sensitive portable devices that use 1-cell Li+ battery packs, including mid-/high-end phones, smartphones, PDAs, portable navigation/GPS devices, digital still and video cameras and VoIP phones.

The DS2784's fuel gauge estimates available capacity based on coulomb count, discharge rate, temperature, and cell characteristics. The DS2784 combines a precision, analog front-end for measuring current and voltage with a proven, embedded fuel-gauge algorithm. On-chip temperature measurements eliminate the need for a thermistor in the battery pack.

The 1-cell Li+ protector monitors for cell overvoltage, undervoltage, overcurrent and short-circuit conditions. Thresholds are user-programmable and can be locked to prevent accidental overwrites. The DS2784's built-in charge pump enables cell protection to be implemented with high-side n-channel FETs.

Pricing: Starts at $2.94 (1000-up, FOB USA).
Availability: Now.
Datasheet: click here.

Maxim Integrated Products, 1-408-737-7600,

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