MAXIM'S SMALLEST, SIMPLEST, SWITCH-MODE Li+ CHARGER IN 4mm x 4mm QFN PACKAGE
SUNNYVALE, CA-September 16, 2002-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX1925/MAX1926 low-cost single-cell lithium ion (Li+) switch-mode battery chargers for use in digital still cameras and PDAs. The MAX1925/MAX1926 use an inexpensive external PMOS pass element step-down configuration for applications where low heat dissipation and small size are critical. Charge current is programmable up to 1A, and an external capacitor sets the maximum charge time.
Additional features include automatic input power detection (AC adapter detection), logic-controlled enable, and temperature monitoring with an external thermistor. The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25V and 12V.
The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells. The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2V and 3V. Full charge current is then applied above 3V. An output drives a LED to indicate charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are packaged in a tiny 12-pin 4mm x 4mm QFN and are screened for the extended-industrial temperature range (-40°C to +85°C). Prices start at $ 1.70 (1000-up, FOB USA). An evaluation kit is available to speed design.
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