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LTC17304.2

Features: Complete Pulse Charger for 1-Cell Lithium-Ion Batteries1% Float Voltage AccuracyEnd-of-Charge (C/10) Detection OutputProgrammable Charge Termination TimerInternal 0.35W NMOS SwitchNo Blocking Diode RequiredSense Resistor Limits Maximum Current for SafetySEL Pin to Set Either 4.1V or 4.2V...

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LTC17304.2: Features: Complete Pulse Charger for 1-Cell Lithium-Ion Batteries1% Float Voltage AccuracyEnd-of-Charge (C/10) Detection OutputProgrammable Charge Termination TimerInternal 0.35W NMOS SwitchNo Block...

LTC17304.2 Data Sheet

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Part Number:
LTC17304.2
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

 Complete Pulse Charger for 1-Cell Lithium-Ion Batteries
 1% Float Voltage Accuracy
 End-of-Charge (C/10) Detection Output
 Programmable Charge Termination Timer
 Internal 0.35W NMOS Switch
 No Blocking Diode Required
 Sense Resistor Limits Maximum Current for Safety
 SEL Pin to Set Either 4.1V or 4.2V Per Cell (LTC1730-4)
 Low-Battery Drain when Input Supply Is Removed
 Battery Temperature Sensing and Charge Qualification
 Automatic Trickle Charging for Low-Battery Cell
 Automatic Battery Refresh


Application

 Standalone Lithium-Ion Battery Charger
 Personal Information Appliances
 Cellular Telephones


Pinout

Connection Diagram


Specifications

Supply Voltage (VCC) ............................................................................ 13.2V
SENSE, GATE, BAT, TIMER, NTC/SHDN, SEL ................................ 0.3V to VCC
CHRG, ACPR, FAULT ..................................................................0.3V to 13.2V
Operating Junction Temperature Range (Note 2) .................... 40°C to 85°C
Storage Temperature Range ................................................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................................................... 300°C


Description

The LTC®1730 is a complete pulse charger for 1-cell lithium-ion batteries. During pulse charging, the internal MOSFET switch is either fully on or off, virtually eliminating heat generation in the charger.

As the battery becomes charged and approaches the programmed voltage, the internal MOSFET begins to pulse on and off until the programmable timer expires. The end-of-charge condition is indicated at the CHRG pin when the average charge current falls to C/10. Removing the input voltage puts the LTC1730 into a sleep mode, dropping the battery current drain to less than 1mA (maximum).

An external sense resistor limits the maximum charge current as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode.

The LTC1730-4 is available in the 16-pin SSOP package and the LTC1730-4.2 is available in the 8-pin SO package.




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