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LTC4001

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

LTC4001
LTC4001

Overview
LTC4001 2A Synchronous Buck Li-Ion Charger FEATURES Low Power Dissipation ■ 2A Maximum Charge Current ■ No External MOSFETs, Sense Resistor or Blocking Diode Required ■ Remote Sensing at Battery Terminals ■ Programmable Charge Termination Timer ■ Preset 4.
2V Float Voltage with ±0.
5% Accuracy ■ Programmable Charge Current Detection/Termination www.
DataSheet4U.
com ■ Automatic Recharge ■ Thermistor Input for Temperature Qualified Charging ■ Compatible with Current Limited Wall Adapters ■ Low Profile 16-Lead (4mm × 4mm) QFN Package ■ DESCRIPTIO The LTC®4001 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 includes complete charge termination circuitry, automatic recharge and a ±1% 4.
2V float voltage.
Input short-circuit protection is included so no blocking diode is required.
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 is available in a low profile (0.
75mm) 16-lead (4mm × 4mm) QFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U APPLICATIO S ■ ■ ■ ■ ■ Handheld Battery-Powered Devices Handheld Computers Charging Docks and Cradles Digital Cameras Smart Phones TYPICAL APPLICATIO 2A Single Cell Li-Ion Battery Charger 1.
5µH SW VIN 4.
5V TO 5.
5V VINSENSE PVIN 10µF PGND CHRG NTC FAULT EN PROG IDET TIMER 0.
22µF 274Ω 0.
1µF 4001 TA01a SENSE 10µF + 4.
2V Li-Ion TOTAL APPLICATION CIRCUIT POWER DISSIPATION (W) BATSENS BAT LTC4001 SS GNDSENS U Power Loss vs VBAT Charging (PWM Mode) 1.
25 1.
00 0.
75 0.
...


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