LTC4001

PRODUCTION

2A Synchronous Buck Li-Ion Charger

Analog Devices LTC4001 Product Info

10 February 2026 4

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
Compatible with Current Limited Wall Adapters
Low Profile 16-Lead (4mm × 4mm) QFN Package

Part details & applications

The LTC4001 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.


	Float Voltage
LTC4001	4.2V
LTC4001-1	4.1V

Applications

Handheld Battery-Powered Devices
Handheld Computers
Charging Docks and Cradles
Digital Cameras
Smart Phones

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