ETA4054

www.etasolution.com

6

Powering Minds of the Smart

protect against reverse current in the power MOSFET, the UVLO circuit keeps the charger in shutdown mode if VIN

falls to within 30mV of the battery voltage. If the UVLO comparator is tripped, the charger will not come out of shutdown

mode until VIN rises 100mV above the battery voltage.

Manual Shutdown

Floating the ISET pin by removing the resistor from ISET pin to ground can put the device in shutdown mode. The

battery drain current is thus reduced to <5μA and the supply current to <50μA. Reconnecting the resistor back will

restart a new charge cycle. Once manually shutdown, the ISET pin is in a high impedance state.

Automatic Recharge

After the termination of the charge cycle, the ETA4054 constantly monitors the BAT pin voltage and starts a new charge

cycle when the battery voltage falls below 4.05V, keeping the battery at fully charged condition. ISET pin output enters

a strong pull-down state during recharge cycles.

PACKAGE OUTLINE

Package: SOT23-5