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LTC1731-4.1

Features: · Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries· 1% Voltage Accuracy·Programmable Charge Current·C/10 Charge Current Detection Output·Programmable Charge Termination Timer·Space Saving, Thin 8-Pin MSOP Package·Automatic Sleep Mode When Input Supply is Removed (7mA B...

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SeekIC No. : 004401850 Detail

LTC1731-4.1: Features: · Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries· 1% Voltage Accuracy·Programmable Charge Current·C/10 Charge Current Detection Output·Programmable Charge Termination ...

LTC1731-4.1 Data Sheet

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Part Number:
LTC1731-4.1
Supply Ability:
5000

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  • 1~5000
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  • 15 Days
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Product Details

Description



Features:

· Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries
· 1% Voltage Accuracy
· Programmable Charge Current
· C/10 Charge Current Detection Output
· Programmable Charge Termination Timer
· Space Saving, Thin 8-Pin MSOP Package
· Automatic Sleep Mode When Input Supply is Removed (7mA Battery Drain)
· Automatic Trickle Charging of Low Voltage Cells
· Programmable for Constant-Current-Only Mode


Application

· Cellular Phones
· Handheld Computers
· Charging Docks and Cradles
· Programmable Current Source


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VCC) ................................... 13.2V
Input Voltage (SENSE, DRV, BAT,
    TIMER, PROG) ....................... 0.3V to (VCC + 0.3V)
Output Voltage (CHRG) ......................... 0.3V to 13.2V
Operating Temperature Range (Note 2) ....40° to 85
Storage Temperature Range ................. 65 to 150
Lead Temperature (Soldering, 10 sec).................. 300


Description

The LTC®1731-4.1 is a complete constant-current/constant- voltage linear charge controller for lithium-ion batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. The external sense resistor sets the charge current with 5% accuracy. An internal resistor divider and precision reference set the final float potential with 1% accuracy. The output float voltage is set internally to 4.1V.

When the input supply of LTC1731-4.1 is removed, the LTC1731 automatically enters a low current sleep mode, dropping the battery drain current to 7mA typically. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V.

The LTC1731-4.1 is available in the 8-pin MSOP and SO packages.




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