Product Details
●The 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 4.5 V to 12 V 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. The ADP2291 also features automatic reverse isolation, which does not require an additional blocking diode.
●The multistep charge cycle optimizes the battery charging time in a safe manner. It features a trickle charge mode for a deeply discharged cell and a fast charging mode with a maximum current of 1.5 A. The ADP2291 controls the end of charge with a 4.2 V output voltage that is 1% accurate over line and temp-erature. It automatically recharges the battery if the cell voltage drops. When the input supply is removed, the part enters a low current state and reduces the current drawn from the battery to below 1 µA.
●The ADP2291 is available in both a small, 8-pin MSOP package and a 3 × 3 mm LFCSP package that is ideally suited for small, portable applications.
●### Features and Benefits
● Simple, Safe Linear Charger for Single Cell Lithium Battery
● 4.5 V to 12 V Input Voltage Range
● Adjustable Charging Current up to 1.5 A
● 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
● 4.2 V Output Voltage with ±1% Accuracy Over Line and Temperature.
