ANALOG DEVICES LTC1921CMS8#PBF Power Supply Controller, Dual, -10 to -80 Vin, MSOP, 8-Pins, 0 to 70 °C

LTC1921 is a dual -48V supply and fuse monitor. It monitors two independent -48V supplies, including their fuses, and drives upto three opt isolators to indicate status, in accordance with standard backplane specifications. Requiring only three noncritical resistors and opt isolators, this device replaces multiple voltage comparators, a voltage reference and several precision resistors. This 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. It is used in application such as telecom backplanes or switch cards, networking backplanes or switch cards, high voltage fuse monitoring etc.

• Withstands transient voltages upto 200V/-200V
• Requires no precision external components
• Undervoltage faults: -38.5V ±1VMAX
• Overvoltage faults: -70V ±1.5VMAX
• Accurately detects undervoltage fault recovery:-43V ±0.5VMAX
• Monitors two external fuses
• Supply voltage range is 10V to 80V
• Tolerates accidental supply reversal to 100V
• Supply current is -160µA typical at (TA = 25°C)
• Operating temperature is -40°C to 85°C, package style is 8-lead plastic MSOP