Features and Benefits

• Ultralow Voltage Reset: VCC = 0.5V Guaranteed
• Monitors Three Inputs Simultaneously:
• 3.3V, 5V, ADJ (LTC2911-1)
• 3.3V, 2.5V, ADJ (LTC2911-2)
• 3.3V, 1.8V, ADJ (LTC2911-3)
• 3.3V, 1.2V, ADJ (LTC2911-4)
• 3.3V, ADJ, ADJ (LTC2911-5)
• ±1.5% Threshold Accuracy
• Power-Fail Monitor
• RST State Can Be Held for Margining
• Low Supply Current: 30μA Typical
• Input Glitch Immunity
• Adjustable Reset Timeout Period
• Selectable Internal Timeout Saves Components
• Space Saving 8-Lead TSOT-23 and 3mm × 2mm DFN Packages

Product details

The LTC2911 is a low power, high accuracy triple supply monitor with a power-fail comparator. Reset timeout may be selected with an external capacitor or set to an internally generated 200ms.

The V1 pin monitors a 3.3V supply. The V2 pin monitors a 5V, 2.5V, 1.8V, 1.2V or adjustable supply. A third adjustable input has a nominal 0.5V threshold allowing a resistive divider to configure its threshold. All three comparators feature a tight 1.5% threshold accuracy over the entire operating temperature range while a glitch filter ensures reliable reset operation.

A spare comparator can be configured to provide early warning of a low voltage condition. It causes the PFO output to pull low when the voltage of the PFI input falls below 0.5V, allowing the power-fail threshold to be configured with a resistive divider. A latch feature on the TMR pin allows the RST output to be latched to prevent system resets, simplifying margin testing.

Applications

• Network Servers
• Desktop and Notebook Computers
• Automotive and Industrial Electronics