LINEAR LTC4055 LTC4055EUF USB Power Controller and Li-Ion Charger

LINEAR

LTC4055EUF

LTC4055 date sheet

Product category

USB Power Controller and Li-Ion Charger

Application

Portable USB Devices: Cameras, MP3 Players, PDAs

Description

Charges Single-Cell Li-Ion Batteries Directly from USB Port

Load Dependent Charging Guarantees USB Input

Current Compliance

Automatic Battery Switchover When Input Supply is Removed

Constant-Current/Constant-Voltage Operation with

Thermal Feedback to Maximize Charging Rate

Without Risk of Overheating*

Selectable 500mA/100mA Current Limit

Low Loss Full PowerPath™ Control with Ideal Diode

Operation (Reverse Current Blocking)

Preset 4.2V Charge Voltage with 0.8% Accuracy(4.1V for LTC4055-1)

4.1V Float Voltage (LTC4055-1) Improves Battery Life

and High Temperature Safety Margin

USB-Compliant Suspend Mode

Programmable Charge Current and Termination Timer

Soft-Start Limits Inrush Current

NTC Thermistor Input for Temperature Qualified Charging

Tiny (4mm × 4mm × 0.75mm) QFN Package

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