LTC4081

PRODUCTION

500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck

Data Sheet Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.31

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Overview

Battery Charger:

Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating
Internal 4.5 Hour Safety Timer for Termination
Charge Current Programmable Up to 500mA with 5% Accuracy
NTC Thermistor Input for Temperature Qualified Charging
C/10 Charge Current Detection Output
5µA Supply Current in Shutdown Mode

Switching Regulator:

High Efficiency Synchronous Buck Converter
300mA Output Current (Constant-Frequency Mode)
2.7V to 4.5V Input Range (Powered from BAT Pin)
0.8V to V_BAT Output Range
MODE Pin Selects Fixed (2.25MHz) Constant-Frequency PWM Mode or Low I_CC (23µA) Burst Mode^® Operation
2µA BAT Current in Shutdown Mode
10-lead, low profile (0.75 mm) 3mm × 3mm DFN package

The LTC4081is a complete constant-current/constantvoltage linear battery charger for a single-cell 4.2V lithium-ion/polymer battery with an integrated 300mA synchronous buck converter. A 3mm × 3mm DFN package and low external component count make the LTC4081 especially suitable for portable applications. Furthermore, the LTC4081 is specifically designed to work within USB power specifications.

The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal 4.5-hour timer terminates the charge cycle. The fullfeatured LTC4081 battery charger also includes trickle charge, automatic recharge, soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature.

The LTC4081 integrates a synchronous buck converter that is powered from the BAT pin. It has an adjustable output voltage and can deliver up to 300mA of load current. The buck converter also features low current high efficiency Burst Mode operation that can be selected by the MODE pin.

The LTC4081 is available in a 10-lead, low profile (0.75mm) 3mm × 3mm DFN package.

Applications

Wireless Headsets
Bluetooth Applications
Portable MP3 Players
Multifunction Wristwatches

Part Models: 2
1ku List Price: Starting From $2.31

Documentation

Data Sheet 1

LTC4081: 500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck Data Sheet 07/21/2015

Reliability Data 1

R540 Reliability Data 03/26/2018

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
LTC4081EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4081EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys