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ME4054 最新中文版(2014版)
ME4054
V03 Page 1 of 16
Standalone Linear Li-Ion Battery Charger in ThinSOT ME4054-4.2V
General Description Features
Applications
? Cellular Telephones, PDAs, MP3 Players
? Charging Docks and Cradles
? Bluetooth Applications
ME4054 is a constant-current/constant-voltage linear
charger for single cell lithium-ion batteries. Its Thin SOT
package and low external component count make the
ME4054 ideally suited for portable applications.
Furthermore, the ME4054 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 MOSFET 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,
and the charge current can be programmed externally with
a single resistor. The ME4054 automatically terminates he
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 ME4054 automatically enters a low current
state, dropping the battery drain current to less than
2μA.The ME4054 can be put into shutdown mode,
reducing the supply current to 25μA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a status pin
to indicate charge termination and the presence of an input
voltage.
? Programmable Charge Current Up to 800mA
? No MOSFET, Sense Resistor or Blocking
Diode Required
? Complete Linear Charger in ThinSOT Package
for Single Cell Lithium-Ion Batteries
? Constant-Current/Constant-Voltage Operation
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