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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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RT9451 Fiches technique(PDF) 4 Page - Richtek Technology Corporation |
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RT9451 Fiches technique(HTML) 4 Page - Richtek Technology Corporation |
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4 / 37 page  RT9451 4 DS9451-00 September 2013 www.richtek.com © Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Function Block Diagram Operation The RT9451 is designed for single cell Li-Ion battery charger in portable applications. Base Circuits Base circuits provide the internal power, VDD and reference voltage and bias current. Protection Circuits The protection circuits include the OVP, UVLO and OTP circuits. The protection circuits turn off the charging when the input power or die temperature is in abnormal level. Switching Charger The switching charger controls the operation during the charging process. The controller will make sure the battery is well charged in a suitable current, voltage, and die temperature. Logic Circuits The STAT and INT indicate the charger and interrupt condition. During the charging process, the STAT pin is pulled low and pulled high when the charger is under abnormal condition or charge done. The INT pin indicates the fault condition. When any fault occurs, the INT is pulled low. LDO The RT9451 provides a 50mA LDO to support the peripheral circuits. The output voltage is regulated to 4.9V and the maximum output current is 120mA. OSC The oscillator runs at fixed 375kHz frequency for the PWM control of switching charger. I 2C Interface The I 2C interface is used to program battery voltage, charge current, termination current, MIVR level, and OTG voltage. D+/D −−−−− Detection The D+/D − detection can detect the devices which are inserted to the USB connector. D+/D- Detection Switching Charger LDO BASE OSC Protection Logic I 2 C Interface VREF IBIAS VDDP ISENL BATS ISENR PGND STAT LX LDO VIN DP VIO SDA DM SCL MID OTG INT MID_LDO GND BOOT |
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