ONE-CHIP SOLUTION FOR CHARGING LITHIUM-ION CELLS
SUNNYVALE, CA-July 14, 1999-Maxim Integrated Products introduces the MAX1667, an SBS IF Specification v1.0 for Level-2-compliant battery chargers that offers high efficiency and universal chemistry support. This one-chip solution for charging lithium-ion cells contains independent voltage and current regulation circuitry that automatically transitions from constant current mode to constant voltage mode during charge. The MAX1667 charges two- to four-series lithium-ion cells and regulates programmed charge voltages to within ±0.8%.
An advanced synchronous buck topology allows the duty cycle to exceed 97%, ensuring low input-to-output voltage differentials while maintaining efficiencies greater than 95%. Using an SMBus™-compatible 2-wire interface, the MAX1667 receives charging voltage and current commands and reports status information about the state of the charger and battery. Charging voltage is programmable from 0 to 18.432V with 11 bits of resolution. Similarly, charging current is programmable over three ranges (1A, 3A, or 4A) with 5 bits of resolution.
The MAX1667 includes battery thermistor fail-safe protection logic that inhibits charging when operating outside of predetermined temperature limits. The MAX1667 can also signal the host controller when power is applied to the charger or when a battery is installed or removed. It can be connected directly to charge sources from 7.5V to 28V and is a pin-for-pin compatible upgrade for the industry-standard MAX1647 Level-2 smart battery charger.
The MAX1667 is available in a space-saving 20-pin SSOP package with a 2mm profile height. It is specified for the extended industrial temperature range (-40°C to +85°C). Prices start from $4.95 (1000 pieces, FOB USA).
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