LTC1921

PRODUCTION

Dual –48V Supply and Fuse Monitor

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $3.32

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Overview

Withstands Transient Voltages Up to 200V/–200V
Requires No Precision External Components
Independently Monitors Two –48V Supplies for

– Undervoltage Faults: –38.5V ±1V_MAX
– Overvoltage Faults: –70V ±1.5V_MAX

Accurately Detects Undervoltage Fault Recovery: –43V ±0.5V_MAX
Monitors Two External Fuses
Operates from –10V to –80V
Tolerates DC Faults to –100V
Tolerates Accidental Supply Reversal to 100V
Small Footprint: 8-Lead MSOP Package
Specified from –40°C to 85°C

The LTC1921 monitors two independent –48V supplies, including their fuses, and drives up to three optoisolators to indicate status, in accordance with standard backplane specifications. Requiring only three noncritical resistors and optoisolators, the LTC1921 replaces multiple voltage comparators, a voltage reference and several precision resistors.

The monitor features dual supply overvoltage and undervoltage detection circuits. The preset trip thresholds include overvoltage, undervoltage and undervoltage recovery that are guaranteed over temperature and meet or exceed common backplane specifications. Additional built-in circuitry detects the condition of supply fuses. Overvoltage and undervoltage detectors ignore fast supply transients, eliminating false detection. The LTC1921 operates from –10V to –80V with a typical power dissipation of less than 10mW.

The LTC1921 is available in 8-pin MSOP and SOIC packages.

Applications

Telecom Backplanes or Switch Cards
Networking Backplanes or Switch Cards
High Voltage Fuse Monitoring

Part Models: 8
1ku List Price: Starting From $3.32

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
LTC1921CMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921CMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921IMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921IMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1921IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1921CMS8#PBF	PRODUCTION
LTC1921CMS8#TRPBF	PRODUCTION
LTC1921IMS8#PBF	PRODUCTION
LTC1921IMS8#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
LTC1921CMS8#PBF	PRODUCTION
LTC1921CMS8#TRPBF	PRODUCTION
LTC1921IMS8#PBF	PRODUCTION
LTC1921IMS8#TRPBF	PRODUCTION
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0246_Form Material_Report Marking Comparison Delta Qualification Matrix
LTC1921CS8#PBF	PRODUCTION
LTC1921CS8#TRPBF	PRODUCTION
LTC1921IS8#PBF	PRODUCTION
LTC1921IS8#TRPBF	PRODUCTION
Oct 12, 2022 - 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
LTC1921CS8#PBF	PRODUCTION
LTC1921CS8#TRPBF	PRODUCTION
LTC1921IS8#PBF	PRODUCTION
LTC1921IS8#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
LTC1921CS8#PBF	PRODUCTION
LTC1921CS8#TRPBF	PRODUCTION
LTC1921IS8#PBF	PRODUCTION
LTC1921IS8#TRPBF	PRODUCTION