AP5056 1A大电流锂电池充电芯片_骊微电子

ChipownAP5054Standalone Linear Li-Ion Battery Charger With Thermal Regulation In SOT深圳市骊微电子科技有限公司芯朋微一级代理DescriptionThe AP5054 is a complete constant current & constant voltage linear charger for single cell lithium-ion batteries. Its SOT package and low external component count make the AP5054 ideally suited for portable applications. Furthermore, the AP5054 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 AP5054 automatically 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 AP5054 automatically enters a low current state, dropping the battery drain current to less than 2uA. The AP5054 can be put into shutdown mode, reducing the supply current to 25uA.Other features include charge current monitor, under-voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.Applicationsl Cellular Telephones, PDAs, MP3 /MP4 Playersl Charging Docks and Cradlesl Bluetooth 、GPS ApplicationsFeaturesl Programmable Charge Current Up to 750mAl No MOSFET, Sense Resistor or Blocking Diode Requiredl Complete Linear Charger in SOT Package for single Cell Lithium-Ion Batteriesl Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheatingl Charges Single Cell Li-Ion Batteries Directly from USB Portl Preset 4.2V Charge Voltage with ±1% Accuracyl Charge Current Monitor Output for Gas Gaugingl Automatic Rechargel Charge Status Output Pinl C/10 Charge Terminationl 25uA Supply Current in Shutdownl 2.9V Trickle Charge Thresholdl Soft-Start Limits Inrush Currentl Available in 5-Lead SOT-23 PackagePackagel SOT23-5LBlock DiagramPin FunctionCHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20uA is connected to the CHRG pin, indicating an “AC present” condition. When the AP5054 detects an under voltage lockout condition, 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 to 4.2V. 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 and should be bypassed with at least a 1uF capacitor. When VCC drops to within 30mV of the BAT pin voltage, the AP5054 enters shutdown mode, dropping IBAT to less than 2uA.PROG (Pin 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1% resistor, RPROG, to ground. When charging in constant-current mode, this pin servos to 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 PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3uA current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown mode, 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 RPROG to ground will return the charger to normal operation.Package InformationSOT23-5LSOT89-5LIMPORTANT NOTICEChipown Microelectronics Co. Ltd. reserves the right to make changes without further notice to any products or specifications herein. Chipown Microelectronics Co. Ltd. does not assume any responsibility for use of any its products for any particular purpose, nor does Chipown Microelectronics Co. Ltd assume any liability arising out of the application or use of any its products or circuits. Chipown Microelectronics Co. Ltd does not convey any license under its patent rights or other rights nor the rights of others.