LTC1731-4.X

PRODUCTION

Single Cell Lithium-Ion Linear Battery Charger Controllers

Part Models: 8
1ku List Price: Starting From $1.98

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Part Details

Complete Linear Charger Controller for 1-Cell Li-Ion Batteries
1% Voltage Accuracy
Programmable Charge Current
C/10 Charge Current Detection Output
Programmable Charge Termination Timer
Space Saving 8-Pin MSOP Package
Automatic Sleep Mode When Input Supply is Removed (Only 7µA Battery Drain)
Automatic Trickle Charging of Low Voltage Cells
Programmable for Constant-Current-Only Mode

The LTC1731 is a complete constant-current/constant-voltage linear charger controller for single cell lithium-ion batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. The external sense resistor sets the charge current with 5% accuracy. An internal resistor divider and precision reference set the final float potential with ±1% accuracy. The output float voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V (LTC1731-4.2).

When the input supply is removed,the LTC1731 automatically enters a low current sleep mode, dropping the battery drain current to typically 7µA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V.

The LTC1731 is available in the 8-pin MSOP and SO packages.


	Float Voltage
LTC1731-4.1	4.1V
LTC1731-4.2	4.2V
LTC1731-8.2	8.2V
LTC1731-8.4	8.4V

Applications

Cellular Phones
Handheld Computers
Charging Docks and Cradles
Programmable Current Source

Part Models: 8
1ku List Price: Starting From $1.98

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
LTC1731EMS8-4.1#PBF	8-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731EMS8-4.1#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731EMS8-4.2#PBF	8-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731EMS8-4.2#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731ES8-4.1#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731ES8-4.1#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731ES8-4.2#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1731ES8-4.2#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
		PCN24_0004_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1731EMS8-4.1#PBF	PRODUCTION
LTC1731EMS8-4.1#TRPBF	PRODUCTION
LTC1731EMS8-4.2#PBF	PRODUCTION
LTC1731EMS8-4.2#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC1731EMS8-4.1#PBF	PRODUCTION
LTC1731EMS8-4.1#TRPBF	PRODUCTION
LTC1731EMS8-4.2#PBF	PRODUCTION
LTC1731EMS8-4.2#TRPBF	PRODUCTION
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1731ES8-4.1#PBF	PRODUCTION
LTC1731ES8-4.1#TRPBF	PRODUCTION
LTC1731ES8-4.2#PBF	PRODUCTION
LTC1731ES8-4.2#TRPBF	PRODUCTION
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0026_Form Material_Report Delta Qualification Matrix
LTC1731ES8-4.1#PBF	PRODUCTION
LTC1731ES8-4.1#TRPBF	PRODUCTION
LTC1731ES8-4.2#PBF	PRODUCTION
LTC1731ES8-4.2#TRPBF	PRODUCTION

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

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

Application Note 1

Technical Articles 1

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