PDF《RT9527A》

3 DS9527A-00 August

2017 www.richtek.com ? Copyright

2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Operation The RT9527Ais a Li-ion charger that can support the input voltage range from 4.4V to 6V. It provides a wide fast- charge current setting ranging from 10mA up to 600mA. Change Current Setting The charging current is adjustable via an external resistor between the ISET andGND pins. UVLO If the input voltage (VIN) is lower than the threshold voltage VUVLO ? ΔVUVLO, the charger will stop charging until VIN is larger than VUVLO. OVP If the input voltage (VIN) is higher than the threshold voltage VOVP, the internal OVP signal will go high and the charger will stop charging until VIN is below VOVP ? ΔVOVP. Switch Well The switch well will choose the highest voltage between VINand BAT to prevent the power switch from damage. Sleep Mode When the voltage difference betweenVINand BATis under VOS_L, the charger will enter sleep mode to save the system power consumption. CC/CV/TR Multi Loop Controller There are constant current loop, constant voltage loop and thermal regulation loop to control the charging current. Too Hot or Too Cold The temperature sense input TS pin can be connected to a thermistor to determine whether the battery is too hot or too cold for charging operation. If the battery'

s temperature is out of range, charging is paused until it re- enters the valid range. PGOOD The PGOOD is an open-drain output used to indicate the input voltage status. The PGOOD will assert low when VIN is in the proper working range. CHG The CHGpin is an open-drain output. The CHGwill assert low when the charger starts to charge the battery and becomes high impedance when the termination current is reached. TIMER The charger contains the safety timer. When the charging time is longer than tPCHG in the pre-charge mode or tFCHG in the fast-charge mode, time fault happens. Then, the charger will be turned off and the CHG pin will become high impedance. RT9527A

4 DS9527A-00 August

2017 www.richtek.com ? Copyright

2017 Richtek Technology Corporation. All rights reserved. is a regi........