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LTC2903-1 - Precision Quad Supply Monitor in 6-Lead SOT-23

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 (VCC) is generated from the greater voltage on the V1, V2 inputs. VCC = V1 for LTC2903-D1 and LTC2903-E1. The RST output is guaranteed to sink at least 5µA (VOL = 0.15V) for VCC 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.

Features Ultralow Voltage Reset: VCC = 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 (ThinSOTTM) Package Typical Application

Applications Multivoltage Systems Optical Networking Systems Cell Phone Base Stations Network Servers Packaging

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