LPB1005B5F

General Description
The LPB1005 product is a highly integrated solution for Li-Ion battery protection. It includes advanced power MOSFETs, precision voltage detection circuitry and delay circuitry for all the protection functions required in battery applications, including overcharge,overdischarge, overcurrent and load short circuit protection. Its accurate overcharge detection voltage
ensures a safe and efficient charging cycle. The low standby current allows for almost no battery current to be consumed during storage.
The LPB1005 is available in an ultra-small SOT23-5/TDFN-6 package.Its simple peripheral circuit
requires only one external capacitor.
This chip is suitable for any electronic device that requires long-term continuous power supply from a Li-Ion battery.

Features
 Protection of Battery Cell Reverse Connection
 Over-temperature Protection
 Integrate Advanced Power MOSFET with
    Equivalent of 42mΩ R DS(ON)
 Two-step Overcurrent Detection:
    Overdischarge Current
    Load Short Circuiting
 Overcharge Current Protection
 0V Battery Charging Function
 Delay Times are generated inside
 High-accuracy Voltage Detection

 Low Current Consumption:
    Operation Mode: 3μA typ.

 Application Information
LPB1005 has functions such as overcharge voltage protection, overdischarge voltage protection,
overdischarge current protection, overcharge current protection and short circuit to operate the battery within the specified range. The chip only requires an external capacitor. MOSFET is integrated, and its RDS (ON) typical value is as low as 42mΩ.

Normal operating mode
LPB1005 monitors the battery voltage connected between the VDD pin and the GND pin and the
voltage difference between the VM pin and the GND pin to control charging and discharging. When the battery voltage is within the range of over-discharge detection voltage (V DL ) to over-charge detection voltage (V CU ), LPB1005 will turn on the charge and discharge control FET at the same time. Under no special test conditions, it can be charged and discharged freely. This state called the normal operating mode.

Overcharge Condition
    Under normal charging process, when the battery voltage is higher than the overcharge detection voltage (V CU ) and the detection continues for the overcharge detection delay time (t CU ) or longer, the LPB1005 will turn off the charging control FET to stop the charging. This situation is called overcharge condition. The release mechanism of the overcharged condition is described in the following 2 points:

1. When the battery voltage is lower than the overcharge release voltage (V CL ), LPB1005 will turn on the charging control FET to release the overcharge condition.

2. When a load is connected and discharging starts, the LPB1005 turns the charging control FET on and returns to the normal condition.The release mechanism is as follows: After detecting overcharge, when the load is connected to start discharging, the discharge current flows through the parasitic diode in the charge control FET, the VM pin voltage rises more than the GND pin voltage due to the Vf voltage of the parasitic diode. If the voltage of the VM pin is higher than or equal to the discharge overcurrent detection voltage (V DIOV ),therefore, when the battery voltage is lower than or equal to the overcharge detection voltage (V CU ), the LPB1005 will release the overcharge condition.
     Even if a heavy load is connected, if the battery voltage is higher than the overcharge detection voltage (V CU ) and the battery voltage does not fall below the overcharge detection voltage (V CU ), discharge overcurrent detection and load short-circuiting detection do not work until the battery voltage falls below overcharge detection voltage (V CU ).
Overdischarge Condition
     Under normal discharging process, when the battery voltage is lower than the overdischarge detection voltage (V DL ) and the detection continues for the overdischarge detection delay time (t DL ) or longer, the LPB1005 will turn off the discharge control FET to stop the discharge. This situation is called overdischarge condition. Under this condition, the current consumption will
be reduced to the power-down current consumption (I PDN ). This situation is called a power-down condition.