LTC1921 Dual 48V Supply and Fuse Monitor

The LTC®1921 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

产品特点 Features

Withstands Transient Voltages Up to 200V/–200V
Requires No Precision External Components
Independently Monitors Two –48V Supplies for
– Undervoltage Faults: –38.5V ±1VMAX
– Overvoltage Faults: –70V ±1.5VMAX
Accurately Detects Undervoltage Fault Recovery: –43V ±0.5VMAX
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

应用

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

典型应用图

LTC1921 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC1921CMS8	MSOP	8	C	$3.40	$2.50
LTC1921CMS8#PBF	MSOP	8	C	$3.40	$2.50
LTC1921CMS8#TR	MSOP	8	C		$2.56
LTC1921CMS8#TRPBF	MSOP	8	C		$2.56
LTC1921CS8	SO	8	C	$3.75	$2.65
LTC1921CS8#PBF	SO	8	C	$3.75	$2.65
LTC1921CS8#TR	SO	8	C		$2.71
LTC1921CS8#TRPBF	SO	8	C		$2.71
LTC1921IMS8	MSOP	8	I	$4.20	$3.15
LTC1921IMS8#PBF	MSOP	8	I	$4.20	$3.15
LTC1921IMS8#TR	MSOP	8	I		$3.21
LTC1921IMS8#TRPBF	MSOP	8	I		$3.21
LTC1921IS8	SO	8	I	$4.35	$3.30
LTC1921IS8#PBF	SO	8	I	$4.35	$3.30
LTC1921IS8#TR	SO	8	I		$3.36
LTC1921IS8#TRPBF	SO	8	I		$3.36

LTC1921 数据手册及相关资料下载

数据手册(英文) : LTC1921 - Dual -48V Supply and Fuse Monitor.PDF
设计要点 (英文) : DN290 - Monitor Network Compliant -48V Power Supplies.PDF
设计要点 (中文) : DN290 Monitor Network Compliant 48V Power Suppliess.PDF
可靠性数据 : R413 Reliability Data .PDF
LT Journal : Aug 2002 Simplify Telecom Power Supply Monitoring with the LTC1921 Integrated Dual -48V Supply and Fuse Monitor.PDF
LT Journal : Dec 2003 Photoflash Capacitor Chargers Fit into Tight Spots.PDF
LT Journal : Dec 2003 Single IC Monitors Redundant -48V Supplies and Fuses without Precision External Components.PDF