ADP2291ARMZ-R7

ADP2291 is a constant-current/constant-voltage linear charger for a single-cell, lithium-ion battery, requiring just a few components to provide a simple and safe charging system that operates from a wide 4.5V to 12V input voltage range. It features an internally controlled, multistep charging cycle that improves battery life. An external, low-cost PNP provides the charging current to the battery, and an external resistor sets the maximum charge current. A small, external capacitor programs the maximum charge time. The controller includes an LED driver to indicate the battery charging status. Safety features include charging stop mode for battery faults, output overshoot protection, and thermal shutdown. Application includes wireless handsets, smart handhelds and PDAs, digital cameras, single-cell, lithium ion-powered systems, and cradle chargers.

• Simple, safe linear charger for single-cell lithium battery
• Low cost PNP external pass element
• Automatic reverse isolation with no external blocking diode
• Output overshoot protection, deep discharge precharge mode
• Thermal shutdown, automatic recharge
• Programmable termination timer, LED charging status indicator
• Input voltage range from 4.5 to 12V (VIN=5.5V, VBAT=4.2V, RADJ open, typ values are at 25°C)
• Typical voltage accuracy, end-of-charge (VBAT, EOC) is 4.2V (TA=0°C to +50°C)
• 8-lead MSOP package
• Temperature rating range from -40°C to +85°C

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ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party