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LTC4062EDD Datasheet(PDF) 9 Page - Linear Technology |
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LTC4062EDD Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page LTC4062 9 4062f OPERATIO The LTC4062 is designed to charge single cell lithium-ion batteries. Using the constant current/constant voltage algorithm, the charger can deliver up to 1A of charge current with a final float voltage accuracy of ±0.35%. The LTC4062 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external sense resistor is required; thus, the basic charger circuit requires only two external components. Normal Operation The charge cycle begins when the voltage at the VCC pin rises above the UVLO level and a discharged battery is connected to BAT. If the BAT pin voltage is below 2.9V, the charger enters trickle charge mode. In this mode, the LTC4062 supplies 1/10th of the programmed charge current in order to bring the battery voltage up to a safe level for full current charging. Once the BAT pin voltage rises above 2.9V, the charger enters constant current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the LTC4062 enters constant voltage mode and the charge current decreases as the battery becomes fully charged. The LTC4062 offers several methods with which to termi- nate a charge cycle. Connecting an external capacitor to the TIMER pin activates an internal timer that stops the charge cycle after the programmed time period has elapsed. Grounding the TIMER pin and connecting a resistor to the IDET pin causes the charge cycle to terminate once the charge current falls below a set threshold when the charger is in constant voltage mode. Connecting the TIMER pin to VCC disables internal termination, allowing external charge user termination through the EN input. See Applications Information for more information on charge termination methods. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. When the charger is in the constant current mode, the voltage on the PROG pin is 1V. The battery charge current is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated by the following equations: R V I I V R PROG CHG CHG PROG == 1000 1000 , The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage and applying the following equation: I V R BAT PROG PROG =• 1000 SmartStart When the LTC4062 is initially powered on or brought out of shutdown mode, the charger checks the battery voltage. If the BAT pin is below the recharge threshold of 4.1V (which corresponds to approximately 80-90% battery capacity), the LTC4062 enters charge mode and begins a full charge cycle. If the BAT pin is above 4.1V, the LTC4062 enters standby mode and does not begin charging. This feature reduces the number of unnecessary charge cycles, prolonging battery life. Automatic Recharge When the charger is in standby mode, the LTC4062 continuously monitors the voltage on the BAT pin. When the BAT pin voltage drops below 4.1V, the charge cycle is automatically restarted and the internal timer is reset to 50% of the programmed charge time (if time termination |
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