Maxim Offers 28V, Single-Input Battery Charger For Handhelds
Maxim Integrated Products introduced the MAX8814, said to be the first 28V-rated, single-input charger for single-cell lithium-ion (Li+) batteries. Requiring only 4mm² of board space, it is stated that this device integrates Maxim’s proprietary temperature and constant-current, constant-voltage (CCCV) regulation circuitry to eliminate overheating during fast-charging and to simplify hardware design.
The MAX8814 features overvoltage-protection circuitry that enables it to withstand input transients up to 28V. Maxim claims that the robustness and integration of this tiny charger make it well suited for use in cell phones, smartphones, USB applications, Bluetooth® devices, and other handheld equipment in which safety, charging speed, and size are of significant concern.
The high integration of the MAX8814 is said to considerably simplify solution implementation, while providing the best savings in both space and BOM cost. This device eliminates the need for a bulky external FET, reverse-blocking diode, current-sense resistor, and thermal-regulation circuitry. Using its CCCV circuitry, the IC intelligently controls the charging sequence from the prequalification state, through constant-current fast-charging, to the final constant-voltage charge. To enhance flexibility, the MAX8814 allows fast-charge current adjustment through an external resistor. Additionally, it features an autobooting circuit that monitors the system-booting signal and input-power status, and provides an enable signal to start system operation.
Packaged in a 2 x 2mm, 8-pin TDFN, the MAX8814 is fully specified over the -40 to +85°C extended temperature range. Prices start at $1.15 (2500-up, FOB USA).
