Sunnyvale, Calif. Maxim Integrated Products has introduced the MAX8814, which the company claims is the industry's first 28-V, single-input charger for single-cell lithium-ion (Li+) batteries. Requiring only 4 mm2 of board space, 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 over-voltage protection circuitry that enables it to withstand input transients up to 28 V. In addition, the high integration of the MAX8814 is said to significantly simplify solution implementation. The device eliminates the need for an external FET, reverse-blocking diode, current-sense resistor, and thermal-regulation circuitry. The combination of protection circuitry and high integration make this tiny charger well-suited for use in cell phones, smart phones, USB applications, Bluetooth devices, and other handheld equipment in which safety, charging speed, and size are key concerns.
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. It also features an autobooting circuit that monitors the system-booting signal and input-power status, and provides an enable signal to start system operation.
The MAX8814 is packaged in a 2 x 2-mm, 8-pin TDFN package. It is specified over the -40°C to 85°C extended temperature range. An evaluation kit is available.
Pricing: Starts at $1.15 (2500-up, FOB USA).
Product information: MAX8814
Maxim Integrated Products, 1-800-998-8800, www.maxim-ic.com