HM5465AV datasheet(5/12 Pages) HMSEMI

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under the overdischarge and power-down conditions. The power-down condition is released when a charger is

connected and the potential difference between VM and VDD becomes 1.3V (typ.) or higher (load

short-circuiting detection voltage). At this time, the FET is still off. When the battery voltage becomes the

overdischarge detection voltage (VDL) or higher (see note), the HM5465A turns the FET on and changes to the

normal condition from the overdischarge condition.

Remark If the VM pin voltage is no less than the charger detection voltage (VCHA), the battery under

overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging

control FET is turned on) as usual, provided that the battery voltage reaches the overdischarge release

voltage (VDU) or higher.

Overcurrent Condition

When the discharging current becomes equal to or higher than a specified value (the VM pin voltage is equal

to or higher than the overcurrent detection voltage) during discharging under normal condition and the state

continues for the overcurrent detection delay time or longer, the HM5465A turns off the discharging control

FET to stop discharging. This condition is called overcurrent condition. (The overcurrent includes overcurrent

or load short-circuiting). The VM and GND pins are shorted internally by the RVMS resistor under the

overcurrent condition. When a load is connected, the VM pin voltage equals the VDD voltage due to the load.

The overcurrent condition returns to the normal condition when the load is released and the impedance

between the B+ and B- pins becomes higher than the automatic recoverable impedance. When the load is

removed, the VM pin goes back to the GND potential since the VM pin potential is lower than the overcurrent

detection voltage (VIOV1), the IC returns to the normal condition.

Abnormal Charge Current Detection

If the VM pin voltage drops below the charger detection voltage (VCHA) during charging under the normal

condition and it continues for the overcharge detection delay time (tCU) or longer, the HM5465A turns the

charging control FET off and stops charging. This action is called abnormal charge current detection.

Abnormal charge current detection works when the discharging control FET is on and the VM pin voltage

droops below the charger detection voltage (VCHA). When an abnormal charge current flows into a battery in

the overdischarge condition, the HM5465A consequently turns the charging control FET off and stops charging

after the battery voltage becomes the overdischarge detection voltage and the overcharge detection delay

time (tCU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin

and GND pin becomes lower than the charger detection voltage (VCHA) by separating the charger. Since the

0V battery charging function has higher priority than the abnormal charge current detection function, abnormal

charge current may not be detected by the product with the 0V battery charging function while the battery

voltage is low.

Load Short-circuiting Condition

If voltage of VM pin is equal or below short-circuiting protection voltage (VSHORT), the HM5465A will stop

discharging and battery is disconnected from load. The maximum delay time to switch current off is tSHORT.

This status is released when voltage of VM pin is higher than short protection voltage (VSHORT), such as when

disconnecting the load.

Delay Circuits

The detection delay time for overdischarge current 2 and load short-circuiting starts when overdischarge

current 1 is detected. As soon as overdischarge current 2 or load short-circuiting is detected over detection

HM5465A

HM5465AV Datasheet(PDF) 5 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

HM5465AV Datasheet(HTML) 5 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

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