LTC4001 Datasheet | Linear Technology

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 .. - Automatic Recharge - Thermistor Input for Temperature Qualified Charging - patible 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 plete 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 ponents. 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 puters 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...