资 源 简 介
ME4057 is a complete constant-current/constant
voltage linear charger for single cell lithium-ion batteries.With a thermally enhanced 8-PIN SOP package on the
bottom and low external component count make the
ME4057 ideally suited for portable applicaTIons.
Furthermore the ME4057 is specifically designed to work
within USB power specificaTIons.No external sense resistor is needed and no blocking
diode is required due to the internal PMOSFET
architecture .Thermal feedback regulates the charge
current to limit the die temperature during high power
operaTIon or high ambient temperature .The charge voltage
is fixed at 4.2V / 4.34V， and the charge current can be
programmed externally with a single resistor. The ME4057automaTIcally terminates the charge cycle when the charge
current drops to 1/10th the programmed value after the final
float voltage is reached.When the input supply （wall adapter or USB supply） is
removed the ME4057 automatically enters a low current
state dropping the battery drain current to less than
2μA.The ME4057 can be put into shutdown mode reducing
the supply current to 55μA.Other features include Battery temperature monitor，
under-voltage lockout， automatic recharge and two status
pins to indicate charge and charge terminatio
