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LTC4001-1

Linear Technology
Part Number LTC4001-1
Manufacturer Linear Technology
Description 2A Synchronous Buck Li-Ion Charger
Published Jun 3, 2010
Detailed Description LTC4001-1 2A Synchronous Buck Li-Ion Charger FEATURES Low Power Dissipation n 2A Maximum Charge Current n No External MO...
Datasheet PDF File LTC4001-1 PDF File

LTC4001-1
LTC4001-1

Overview
LTC4001-1 2A Synchronous Buck Li-Ion Charger FEATURES Low Power Dissipation n 2A Maximum Charge Current n No External MOSFETs, Sense Resistor or Blocking Diode Required n Remote Sensing at Battery Terminals n Programmable Charge Termination Timer n Preset 4.
1V Float Voltage with ±0.
5% Accuracy www.
DataSheet4U.
com n 4.
1V Float Voltage Improves Battery Life and High Temperature Safety Margin n Programmable Charge Current Detection/ Termination n Automatic Recharge n Thermistor Input for Temperature Qualified Charging n Compatible with Current Limited Wall Adapters n Low Profile 16-Lead (4mm × 4mm) QFN Package n DESCRIPTION The LTC®4001-1 is a 2A Li-Ion battery charger intended for 5V wall adapters.
It utilizes a 1.
5MHz synchronous buck converter topology to reduce power dissipation during charging.
Low power dissipation, an internal MOSFET and sense resistor allow a physically small charger that can be embedded in a wide range of handheld applications.
The LTC4001-1 includes complete charge termination circuitry, automatic recharge and a ±1% 4.
1V float voltage.
Input short-circuit protection is included so no blocking diode is required.
This 4.
1V version of the standard LTC4001 is intended for applications which will be operated or stored above approximately 60°C.
Under these conditions, the reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery.
A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells.
Battery charge current, charge timeout and end-of-charge indication parameters are set with external components.
Additional features include shorted cell detection, temperature qualified charging and overvoltage protection.
The LTC4001-1 is available in a low profile (0.
75mm) 16-lead (4mm × 4mm) QFN package.
APPLICATIONS n n n n n Handheld Battery-Powered Devices Handheld Computers Charging Docks and Cradles Digital...


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