MAX1736EUT42+T

The MAX1736EUT42+T is a single-cell Li+ battery charger for current limited supply in 6 pin SOT-23 package. It provides simple, safe, low cost method of charging single-cell Li+ battery with nearly no heat generation. Combined with current limited voltage source IC provides precharge, fast-charge and top-off-charge capabilities. After constant current fast charge, top-off safely finishes charging battery by pulse width modulating charge current. The top-off on-time is kept below electrochemical time constant of cell. The key advantage of this method is charge circuit is small and generates minimal heat while providing a safe method of charging to ensure maximum cell life. It initiates charging in one of four ways, battery insertion, charger power-up, battery voltage threshold and by external manipulation of the EN pin. It is used in single-cell Li+ portable applications, wireless handsets, personal digital assistants, digital cameras, self-charging battery packs and cradle chargers.

• Input voltage range is 4.7V to 22V
• Operating temperature range from -40°C to 85°C
• Stand-alone or µP-controlled operation
• 0.5% voltage set-point accuracy
• Lowest power dissipation
• Low 4.7V min input voltage
• Top-off charging to achieve full battery capacity
• No inductor required
• Safely pre-charges near dead cells
• Automatic power down when input power removed

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Power Management, Portable Devices

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