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AOZ9004BI-01 Datasheet(PDF) 10 Page - Alpha & Omega Semiconductors |
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AOZ9004BI-01 Datasheet(HTML) 10 Page - Alpha & Omega Semiconductors |
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10 / 17 page  AOZ9004B Rev. 1.2 August 2008 www.aosmd.com Page 10 of 17 When a battery is in the normal status, and the discharge current becomes abnormally higher (EB+ pin and EB- pin shorted), and thus the VM pin voltage is equal or higher than load short-circuiting detection voltage (VSHORT) for load short-circuiting detection delay time (tSHORT), the IC turns off the discharge control MOSFET and stops discharging. This status is the load shorting-circuiting status. In the load shorting-circuiting status, the VM pin and VSS pin are shorted by the resistor between VM pin and VSS pin (RVMS) in the IC. When the short-circuiting condition is released, the VM pin returns to the VSS potential. The resistance (RVMD) between the VM pin and VDD pin is not connected in the load shorting- circuiting status. Charge Over-Current Status When a battery in the normal status, and the charge cur- rent is higher than the specified value and the status lasts for the charge over-current detection delay time (tCIOV), the charge control MOSFET is turned off and charging is stopped. This status is the charge over-current status. This IC will be restored to the normal status from the charge over-current status when, the voltage at the VM pin returns to charge over-current detection voltage (VCIOV) or higher by removing the charger. The charge over-current detection function does not work in the over- discharge status. The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS pin are not connected in the charge over-current status. 0V Battery Charging Function “Available” This function is used to recharge a connected battery whose voltage is 0V due to self-discharge. When the 0V battery charge starting charger voltage (V0CHA) or a higher voltage is applied between the EB+ and EB- pins by connecting a charger, the charging control MOSFET gate is fixed to the VDD pin voltage. When the voltage between the gate and source of the charging control MOSFET becomes equal to or higher than the turn-on voltage due to the charger voltage, the charging control MOSFET is turned on to start charging. At this time, the discharging control MOSFET is off and the charging current flows through the internal parasitic diode in the discharging control MOSFET. When the battery voltage becomes equal to or higher than over- discharge release voltage (VDU), the AOZ9004B enters the normal status. Battery Charging Function “Unavailable” This function inhibits recharging when a battery that is internally short-circuited (0V battery) is connected. When the battery voltage is the 0V battery charge inhibition battery voltage (V0INH) or lower, the charging control MOSFET gate is fixed to the EB- pin voltage to inhibit charging. When the battery voltage is the 0V battery charge inhibition battery voltage (V0INH) or higher, charging can be performed. Calculation of Current Limit The charge and discharge current limit is determined by the charge and discharge over-current threshold voltages (VDIOV and VCIOV), and the total resistance of the internal MOSFET (RSS). Use the following equations to deter- mine the maximum and minimum current limits: MIN SS MAX DIOV MAX DIOV R V I _ _ _ = ; MAX SS MIN DIOV MIN DIOV R V I _ _ _ = MIN SS MAX CIOV MAX CIOV R V I _ _ _ = ; MAX SS MIN CIOV MIN CIOV R V I _ _ _ = |
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