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ISL9205CIRZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL9205CIRZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 14 page 9 FN9252.2 July 28, 2010 Functional Block Diagram Theory of Operation The ISL9205 is an integrated charger for single-cell Li-ion or Li-polymer batteries. The ISL9205 is capable of operating in two operation modes, linear charge mode and pulse charge mode. The ISL9205 functions as a traditional linear charger when powered with a voltage source adapter. When powered with a current-limited adapter, the charger functions as a pulse charger by fully turning on the pass element and the power dissipation is hence drastically reduced. Constant Current Phase The ISL9205 starts the charge at a constant current (CC) phase. The charge current is regulated to fast charge the battery before the final voltage has been reached. The charge current is programmable with the IREF pin and has two operation modes: trickle mode and constant current mode, depending on the battery voltage. When the battery voltage is lower than 2.8V, the charger operates in trickle mode where the charge current is set at 10% of the constant current mode current. The trickle mode is for preconditioning a deeply discharged battery. Once the battery voltage is above the typical 2.8V threshold, the constant current (CC) mode starts. The constant current is programmable between 50mA to 1A. Constant Voltage Phase When the battery reaches the final voltage, the ISL9205 switches the operation to a constant voltage (CV) phase. The output voltage is regulated at the final voltage value. LOGIC STATUS ISEN VIN VBAT 100000:1 CURRENT MIRROR COUNTER + - + - VMIN + - + - VCH IREF + - FAULT RECHARGE MINBAT VRECHRG CA VA MIN_I IR ISEN IMIN= IR/10 CHRG STATUS FAULT + - + - INPUT_OK V POR TRICKLE/FAST REFERENCES V2P8 TEMPERATURE MONITORING CURRENT REFERENCES IT TIME OSC GND VIN Q MAIN QSEN R IREF C1 VSEN + 80mV EN INPUT_OK ESD DIODE TEMP MONITOR TEMP ISL9205 |
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