LTC4055
LTC4055-1

PRODUCTION

USB Power Controller and Li-Ion Linear Charger

Part Models: 4
1ku List Price: Starting From $2.93

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Overview

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 x 4mm x 0.75mm) QFN Package

The LTC4055/LTC4055-1 are USB power manager and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts manage and limit the total current used by the USB peripheral for operation and battery charging. Depending on the state of the current select pin (HPWR), total input current can be limited to either 100mA or 500mA. The voltage drop from the USB supply or battery to the USB peripheral is typically less than 100mV at 400mA and 20mV at 80mA. Other management features include: automatic switch over to battery when input is removed, inrush current limiting, reverse current blocking, undervoltage lockout and thermal shutdown.

The LTC4055/LTC4055-1 include a complete constant-current/constant-voltage linear charger for single cell Li-ion batteries. The ﬂoat voltage applied to the battery is held to a tight 0.8% tolerance, and charge current is programmable using an external resistor to ground. Fully discharged cells are automatically trickle charged at 10% of the programmed current until the cell voltage exceeds 2.8V. Total charge time is programmable by an external capacitor to ground. When the battery drops 100mV below the ﬂoat voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor battery temperature while charging.

The LTC4055/LTC4055-1 are available in a 16-pin low proﬁle (4mm x 4mm) QFN package.

Applications

Portable USB Devices: Cameras, MP3 Players, PDAs

Part Models: 4
1ku List Price: Starting From $2.93

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4055EUF#PBF	16-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4055EUF#TRPBF	16-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4055EUF-1#PBF	16-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4055EUF-1#TRPBF	16-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Battery Monitors & Fuel Gauges 1
LTC2942	NOT RECOMMENDED FOR NEW DESIGNS	Battery Gas Gauge with Temperature, Voltage Measurement
Interface Transceivers & Isolators 1
LTM2884	PRODUCTION	Isolated USB Transceiver with Isolated Power
Protection Switches & Controllers 1
LTC4360-1 LTC4360-2		Overvoltage Protection Controller