AP5054B 4.2V线性锂电池充电器芯片.pdf

AP5054ChipownStandalone Linear Li- Ion BatteryCharger With Thermal Regulation In SOTDescriptionThe AP5054 is a complete constant current & constantvoltage linear charger for single cell lithium- ion batteries.Its SOT package and low external component countmake the AP5054 ideally suited for portable applications.Furthermore, the AP5054 is specifically designed towork within USB power specifications.No external sense resistor is needed, and no blockingdiodeisrequiredduetotheinternalMOSFETarchitecture. Thermal feedback regulates the chargecurrent to limit the die temperature during high poweroperation or high ambient temperature. The chargevoltage is fixed at 4.2V, and the charge current can beprogrammed externally with a single resistor. TheAP5054 automatically terminates the charge cycle whenthe charge current drops to 1/10ththe programmed valueafter the final float voltage is reached.When the input supply (wall adapter or USB supply) isremoved, the AP5054 automatically enters a low currentstate, dropping the battery drain current to less than 2uA.The AP5054 can be put into shutdown mode, reducingthe supply current to 25uA.Otherfeaturesincludechargecurrentmonitor,under- voltage lockout, automatic recharge and a statuspin to indicate charge termination and the presence of aninput voltage.Applications Cellular Telephones, PDAs, MP3 /MP4 Players Charging Docks and Cradles Bluetooth 、GPS ApplicationsFeatures Programmable Charge Current Up to 750mA No MOSFET, Sense Resistor or Blocking DiodeRequired Complete Linear Charger in SOT Package for singleCell Lithium- Ion Batteries Constant- Current/Constant- Voltage Operation withThermalRegulationtoMaximizeChargeRateWithout Risk of Overheating Charges Single Cell Li- Ion Batteries Directly fromUSB Port Preset 4.2V Charge Voltage with 1% Accuracy Charge Current Monitor Output for Gas Gauging Automatic Recharge Charge Status Output Pin C/10 Charge Termination 25uA Supply Current in Shutdown 2.9V Trickle Charge Threshold Soft- Start Limits Inrush Current Available in 5- Lead SOT- 23 PackagePackage SOT23- 5LBlock Diagram深圳市骊微电子科技有限公司芯朋微一级代理w w w .s z l w t e ch .co mAP5054ChipownPin FunctionCHRG (Pin 1): Open- Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by aninternal N- channel MOSFET. When the charge cycle is completed, a weak pull- down of approximately 20uA isconnected to the CHRG pin, indicating an “ AC present”condition. When the AP5054 detects an under voltage lockoutcondition, CHRG is forced high impedance.GND (Pin 2): Ground.BAT (Pin 3): Charge Current Output. Provides charge current to the battery and regulates the final float voltage to4.2V. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode.VCC (Pin 4): Positive Input Supply Voltage. Provides power to the charger, VCC can range from 4.25V to 6.5V andshould be bypassed with at least a 1uF capacitor. When VCC drops to within 30mV of the BAT pin voltage, theAP5054 enters shutdown mode, dropping IBATto less than 2uA.PROG (Pin 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current isprogrammed by connecting a 1% resistor, RPROG, to ground. When charging in constant- current mode, this pin servosto 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula:IBAT= (VPROG/RPROG) 1000The PROGpin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3uAcurrent to pull the PROGpin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdownmode, charging stops and the input supply current drops to 25uA. This pin is also clamped to approximately 2.4V.Driving this pin to voltages beyond the clamp voltage will draw currents as high as 1.5mA. Reconnecting RPROGtoground will return the charger to normal operation.Package Information SOT23- 5L深圳市骊微电子科技有限公司芯朋微一级代理w w w .s z l w t e ch .co mAP5054Chipown SOT89- 5LIMPORTANT NOTICEChipown Microelectronics Co. Ltd. reserves the right to make changes without further notice to any products orspecifications herein. Chipown Microelectronics Co. Ltd. does not assume any responsibility for use of any itsproducts for any particular purpose, nor does Chipown Microelectronics Co. Ltd assume any liability arising out of theapplication or use of any its products or circuits. Chipown Microelectronics Co. Ltd does not convey any license underits patent rights or other rights nor the rights of others.深圳市骊微电子科技有限公司芯朋微一级代理w w w .s z l w t e ch .co m