ETA6096

www.etasolution.com

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FUNTIONAL DESCRITION

ETA6096 is a switching Li-Ion battery charger capable of delivering up to 2.5A of charging current to the battery.

With OVP function, the IC can stand off input voltage as high as 32V, making it an ideal solution for industrial

applications. It features pre-charging, fast charging(CC) and constant voltage(CV) charging, end-of charging

termination, and auto-recharge. Charge current can be set by an external resistor connecting to ISET pin, and charge

status is output by STAT pin.

CC/CV Regulation Loop

There are CC/CV regulation loops built in ETA6096, with regulates either current or voltage as necessary to ensure

fast and safe charging of the battery. In a normal charge cycle, this loop regulates the current to the value set by the

external resistor at the ISET pin. Charging continues at this current until the battery cell voltage reaches the

termination voltage. At this point, the CV loop takes over, and charge current is allowed ti decrease as necessary to

maintain charging at the termination voltage.

Precondition Charge

A new charging cycle begins with the precondition state, and operation continues in this state until Vbat exceeds the

precondition threshold voltage. When operating in precondition state, the cell is charged at 200mA. Once Vbat

reaches the precondition threshold voltage, the state machine jumps to the fast charge state.

Fast Charge

If battery voltage is above preconditioning threshold, buck converter chargers battery with constant current. In fast

charge state, the ETA6096 charges at the current set by external resistor connected at ISET pin. For example, a 2A

fast charge current can be achieved by setting the resistor to be 82K. During a normal charge cycle, fast charge

continues in CC mode until Vbat reaches the charge termination voltage, at which point the ETA6096 enters into top

off state.

Top off

With the battery voltage approaches the end of charge (EOC) voltage (4.2V, preset internally), charge current

decreases as charging continues. In the top off state, the cell is charged in constant voltage (CV) mode. During a

normal charging cycle, charging proceeds until the charge current decreases below 130mA, the EOC threshold. And

then, the state machine terminates the charge cycle and jumps to the EOC state.

End of charge

When charge current decreases to 130mA, the buck converter ceases and keep monitoring the battery voltage.

Recharge

When battery voltage drops by 160mV below the EOC voltage, the Buck converter is turned on again, and re-start

the constant current charge cycle.