EC49017数据手册E-CMOS中文资料规格书

描述 Description

EC49017 is a complete constant-current & constant voltage linear charger for single cell lithium-ion and Lithium-Polymer batteries. Its SOT23 package and low external component count make EC49017 ideally suited for portable applications.thermore, the EC49017 is specifically designed to work within USB power specification. At the same time, EC49017 can also be used in the standalone lithium-ion and ithium-polymer battery chargers.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 4.22V, and the charge current can be programmed externally with a single resistor.The EC49017 automatically inates the charge cycle when the charge current drops to 1/10 th the programmed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the EC49017 automatically enters a low current stage, opping the battery drain current to less than 2uA. The EC49017 can be put into hutdown mode, reducing the supply current to 20uA. Other features include charge current onitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. EC49017 is intentionally designed to haveslightly negative Tempco. This provides extra protection to Lithium battery during charging.

特性 Features

l Programmable Charge Current Up to 800mA
l No MOSFET, Sense Resistor or Blocking Diode Required
l Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating
l Charges Single Cell Li-ion Batteries Directly from USB Port
l Preset 4.22V Charge Voltage with ±1% Accuracy
l 20μA Supply Current in Shutdown
l 2.9V Trickle Charge Threshold
l Soft-Start Limits Inrush Current
l Available in 6-Lead SOT23 and SOP-8(Exposed PAD) Packages
l RoHS Compliant and 100% Lead Pb free

应用 Application

• Cellular Telephones, PDA, MP3 Players
• Charging Docks and Cradles
• Bluetooth Applications