PDF IT4054 Data sheet ( Hoja de datos )

Número de pieza	IT4054
Descripción	Standalone Linear Li-lon Battery Charger
Fabricantes	Infiniture
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No Preview Available ! IT4054 Standalone Linear Li-lon Battery Charger With Thermal Regulation in ThinSOT Description Features IT4054 is a complete constant-current & Constant voltage ● Programmable Charge Current Up to 800mA. linear charge for single cellLithium-ion and Lithium-Polymer ● No MOSFET,Sense Resistor or Blocking Diode batteries. Its Make IT4054 ideally suited for portable Required. Applications. Furthermore. The IT4054 is Specifically ● Constant-Current/Constant-Voltage Operation with designed to work within USB Power sprcification. At the Thermal same time, IT4054 Can also be used in the standalone Protection to Maximize Charge Rate without Risk of lithium - Ion And Lithium-polymer battery charger. No Overheating. external sense resistor is needed, and No Blocking diode is ● Charges Single Cell Li-lon Batteries Directly from USB required due to the Internal MOSFET architecture. Thermal Port. feedback Regulates the charge current to limit the ● Preset 4.2V Charge Voltage with ±1% Accuracy. dieTemperature during high power operation or High ● 25uA Supply Current in Shutdown ambient temperature. The charge voltage Is fixed at 4.2V, ● 2.9V Trickle Charge Threshold and the charge current can be programmed externally with ● Available Without Trickle Charge a single resistor .The IT4054 automatically thrminates the ● Soft-Start Limits Inrush Current charge cycle when the charge current drops to 1/10th the ● Available in 5-Lead SOT-23 Package programmed value after the final float voltage is reached. Application When the input supply ( wall adapter or USB supply ) is ● Cellular Telephones. PDA’s,MP3 Players. removed. The IT4054 automatically enters a low current ● Charging Docks and Cradles stage,dropping the battery drain current to less than 2uA ● Bluetooth Applications The IT4054 can be put into shutdown mode. Reducing the supply current to 25 uA. 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. Other features include charge current monitor,undervoltage Lockout,automatic recharge and a status pin to indicate Charge termination and the presenceof an input voltage 1 Free Datasheet http://www.nDatasheet.co 1 page IT4054 Operation Lockout conditions.A weak pull-down indicates that Vcc Meets the UVLO conditions and the IT4054 is ready to Charge.High impedance indicates that the IT4054 is in Undervoltage lockout mode:either Vccis less than 100 mV above the BAT pin voltage or insufficient voltage is applied to the Vcc pin.A microprocessor can be used to distin-guish between these three states-this method is dis-cussed in the Applications Information section. Thermal Limiting An internal thermal feedback loop reduces the programmed Charge current if the die temperature attempts to rise above a preset value of approximately 120℃.This feature protects the IT4054 from excessive Temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the IT4054.The charge current can be set according to typical (not worst-case)ambient temperature with the assurance that the charger will automatically reduce the current in worst-case conditions ThinSOT power consid-erations are discussed frither in The Applications Informa-tion section. Undervoltage Lockout(UVLO) An internal undervoltage lockout circuit monitors the input Voltage and keeps the charger in shutdown mode untilVcc rises above the undervoltage lockout threshold.The UVLO circuit has a built-in hysteresis of 200mV . Furthermore,to protect against reverse current in the power MOSFET.the UVLO circuit keeps the charge in shutdown mode if Vcc Falls to within 30 mV of the battery voltage. If the UVLO Comparator is tripped , the charger will not come out of Shutdown mode until Vcc rises 100 mV above the battery voltage. Manual Shutdown At any point in the charge cycle.the IT4054 can be put Into shutdown mode by removing RRPOG thus floating the PROG pin .This reduces the battery drain current to less Than 2µA and the supply current to less than 50µA.A new Charge cycle can be initiated by reconnecting the program resistor. In manual shutdown .the CHRG pin is in a weak pull-down state as long Vcc is high enough to exceed the UVLO conditions.The CHRG pin is in a high impedance state if the IT4054 is in undervoltage lockout mode : either Vcc is within 100mV of the BAT pin voltage or insufficient voltage is applied to Vcc pin. Automatic Recharge Once the charge cycle is terminated,the IT4054 comtinu- ously monitors the voltage on the BAT pin using a com- parator with a 2ms filter time(tRECHARGE ) A chare cycle restarts when the battery voltage falls below 4.05V(which corresponds to approximately 80% to 90% battery capac- ity). This ensures that the battery is kept at or neat a fully charge condition and eliminates the need for periodic charge cycle initiations.CHRG output enters a strong pull- down state during recharge cycle. 5 Free Datasheet http://www.nDatasheet.com 5 Page

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