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LTC4054-4.2

Features: ` Programmable Charge Current Up to 800mA`No External MOSFET, Sense Resistor or Blocking Diode Required` Complete Linear Charger in ThinSOTTM Package for Single Cell Lithium-Ion Batteries` Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without...

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SeekIC No. : 004402415 Detail

LTC4054-4.2: Features: ` Programmable Charge Current Up to 800mA`No External MOSFET, Sense Resistor or Blocking Diode Required` Complete Linear Charger in ThinSOTTM Package for Single Cell Lithium-Ion Batteries`...

LTC4054-4.2 Data Sheet

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Part Number:
LTC4054-4.2
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Programmable Charge Current Up to 800mA
` No External MOSFET, Sense Resistor or Blocking Diode Required
` Complete Linear Charger in ThinSOTTM Package for Single Cell Lithium-Ion Batteries
` Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
` Charges Single Cell Li-Ion Batteries Directly from USB 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
` 25A Supply Current in Shutdown
` 2.9V Trickle Charge Threshold (LTC4054)
` Available Without Trickle Charge (LTC4054X)
` Soft-Start Limits Inrush Current




Application

·Cellular Telephones, PDAs
· Portable MP3 Players
· Charging Docks and Cradles
· Bluetooth Applications


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VCC) ..................... 0.3 to 10V
PROG.......................................... 0.3V to VCC + 0.3V
BAT, CHRG ................................................ 0.3V to 7V
BAT Short-Circuit Duration .......................... Continuous
BAT Pin Current ................................................. 800mA
PROG Pin Current ................................................ 800A
Maximum Junction Temperature ........................ 125°C
Operating Temperature Range (Note 2) .. 40°C to 85°C
Storage Temperature Range ...............65°C to 125°C
Lead Temperature (Soldering, 10 sec)............... 300°C


Description

The LTC4054-4.2 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries.Its ThinSOT package and low external component count make the LTC4054-4.2 especially well-suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications.

No external sense resistor of LTC4054-4.2 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 LTC4054-4.2 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 LTC4054-4.2 automatically enters a low current state, dropping the battery drain current to less than 2A.The LTC4054 can be put into shutdown mode, reducing the supply current to 25A.

Other features of LTC4054-4.2 include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of input voltage.




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