LTC4001 2A Synchronous Buck Li-Ion Charger UFEATURESDESCRIPTIO ■ Low Power Dissipation The LTC®4001 is a 2A Li-Ion battery charger intended for ■ 2A Maximum Charge Current 5V wall adapters. It utilizes a 1.5MHz synchronous buck ■ No External MOSFETs, Sense Resistor or Blocking converter topology to reduce power dissipation during Diode Required charging. Low power dissipation, an internal MOSFET and ■ Remote Sensing at Battery Terminals sense resistor allow a physically small charger that can be ■ Programmable Charge Termination Timer embedded in a wide range of handheld applications. The ■ Preset 4.2V Float Voltage with ±0.5% Accuracy LTC4001 includes complete charge termination circuitry, ■ Programmable Charge Current Detection/Termination automatic recharge and a ±1% 4.2V float voltage. Input ■ Automatic Recharge short-circuit protection is included so no blocking diode is ■ Thermistor Input for Temperature Qualified Charging required. ■ Compatible with Current Limited Wall Adapters Battery charge current, charge timeout and end-of-charge ■ Low Profile 16-Lead (4mm × 4mm) QFN Package U indication parameters are set with external components. APPLICATIO S Additional features include shorted cell detection, tempera- ture qualified charging and overvoltage protection. The ■ Handheld Battery-Powered Devices LTC4001 is available in a low profile (0.75mm) 16-lead ■ Handheld Computers (4mm × 4mm) QFN package. ■ Charging Docks and Cradles , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Digital Cameras All other trademarks are the property of their respective owners. ■ Smart Phones UTYPICAL APPLICATIO2A Single Cell Li-Ion Battery Charger 1.5µH Power Loss vs VBATCharging (PWM Mode) SW SENSE 1.25 VINSENSE BATSENS VIN PVIN BAT 4.5V TO 5.5V + 10µF 4.2V 10µF 1.00 Li-Ion PGND LTC4001 0.75 CHRG NTC 0.50 FAULT DISSIPATION (W) EN 0.25 PROG IDET TIMER SS GNDSENS TOTAL APPLICATION CIRCUIT POWER VIN = 5V 0.22µF 2A CHARGER 0 274Ω 0.1µF 3 3.25 3.5 3.75 4 4.25 V 4001 TA01a BAT (V) 4001 TA01b 4001f 1
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