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MAX1925 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1925 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time. Additional features include automatic input power detection (ACON output), 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. A CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking). The MAX1925/MAX1926 are available in a 12-pin 4mm ✕ 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design. Applications Digital Cameras Self-Charging Battery Packs PDAs Cradle Chargers Features o Small (4mm ✕ 4mm) Package o 4.25V to 12V Input Range (MAX1926) o Overvoltage Lockout at 6.1V (MAX1925) o ±0.75% Battery Regulation Voltage o Set Charge Current with One Resistor o Automatic Input Power Sense o LED (or Logic-Out) Charge Status and Fault Indicator o Programmable Safety Timer o Autorestart at Cell = 4V o Thermistor Monitor Input Switch-Mode 1-Cell Li+ Chargers ________________________________________________________________ Maxim Integrated Products 1 Ordering Information MAX1925 MAX1926 IN EN INP EXT PGND INPUT 4.5V TO 12V LED CT CHG ON OFF ACON THRM GND BATT CS 1-CELL Li+ BATTERY Typical Operating Circuit 19-2556; Rev 1; 10/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN- PACKAGE INPUT CHARGING RANGE MAX1925ETC -40 °C to +85°C 12 Thin QFN 4mm x 4mm 4.5V to 6.1V MAX1926ETC -40 °C to +85°C 12 Thin QFN 4mm x 4mm 4.25V to 12V 12 IN 11 INP 10 EXT 45 CT 6 CS 1 2 EN 3 9 8 7 THRM PGND GND BATT MAX1925 MAX1926 CHG ACON THIN QFN Pin Configuration |
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Similar Description - MAX1925 |
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