电池管理IC

电池管理IC

电池管理IC

The PT6181 is a highly integrated Li-ion battery linear charging management device targeted at space limited portable applications. The PT6181 offers an integrated

MOSFET and current sensor, reverse blocking protection, high accuracy current and voltage regulation, charge status indication, and charge termination in a

SOT23 or ESOP8 package. The PT6181 has low external component count. The PT6181 can also work within USB power specifications.

The PT6181 charges a battery in three phases: trickle charging. constant current, and constant voltage. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture.

The thermal feedback regulates the charging current to limit the chip temperature during high power operation or high ambient temperature to maximize the charge rate without risk of overheating. The charge voltage is fixed at 4.2V, and the charge current can be programmed extermally with a single resistor. The PT6181 automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. The PT6181 automatically re-starts the charge if the battery voltage

falls below an internal threshold.

  FEATURES

Charges Single Cell Li-Ion Batteries Directly from USB Port

Programmable Charge Current Up to 800mA

No MOSFET, Sense Resistor or Blocking Diode

Required

Complete Linear Charger in SOT23-5 or ESOP8

Package for Single Cell Lithium-Ion Batteries

Constant-Current/Constant- Voltage Operation

with Thermal Regulation to Maximize Charge

Rate Without Risk of Overheating

Preset 4.2V Charge utage with +1% Accuracy

  APPLICATIONS

Cellular Telephones, PDAs, MP3 Players

Bluetooth Applications

Digital Cameras

Charging Docks and Cradles

电池管理IC