Features

• Ultralow Voltage Reset: V_CC = 0.5V Guaranteed
• Monitor Four Inputs Simultaneously
  3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1)
  5V, 3.3V, 2.5V, 1.8V (LTC2903-B1)
  5V, 3.3V, 1.8V, –5.2V (LTC2903-C1)
  3.3V, ADJ, ADJ, ADJ (LTC2903-D1)
  5V, ADJ, ADJ, ADJ (LTC2903-E1)
• Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage over Temperature
• 10% (A1, B1, C1) and 5% (D1, E1) Undervoltage Monitoring
• Low Supply Current: 20µA Typical
• 200ms Reset Time Delay
• Active Low Open-Drain RST Output
• Power Supply Glitch Immunity
• Low Profile (1mm) SOT-23 (ThinSOT^TM) Package

Typical Application

Description

The LTC2903-1 monitors up to four supply voltages. The common reset output remains low until all four inputs have been in compliance for 200ms. Voltage thresholds maintain ±1.5% accuracy over temperature (with respect to the monitored voltage). The LTC2903-1 features an open-drain RST output with a weak internal pullup.

Internal supply voltage (V_CC) is generated from the greater voltage on the V1, V2 inputs. V_CC = V1 for LTC2903-D1 and LTC2903-E1. The RST output is guaranteed to sink at least 5µA (V_OL = 0.15V) for V_CC down to 0.5V and will typically conduct current down to 0V. Quiescent current is 20µA typical, making the LTC2903-1 ideal for power conscious systems. The LTC2903-1 is available in a 6-lead low profile (1mm) SOT-23 package.