MIC2778

The MIC2778 is a voltage monitor--uniquely designed to detect two separate voltage thresholds--combined with a delay generator and logic. It is designed for monitoring the battery supply of portable digital systems, particularly PDAs, pagers, and cellular telephones.

High- and low-voltage thresholds can be adjusted independently, allowing for wide hysteresis. Voltage detection thresholds are accurate to 2%.

If the battery voltage falls below the low-voltage threshold, the output (RST) is asserted and latched, preventing system operation until the battery is replaced or recharged. Internal logic prevents the output from chattering due to battery recovery or load removal. The output is asserted for 140ms (minimum) when a fresh battery is inserted. For applications not requiring built-in delay, see MIC841.

The IC's power supply input is separate from the detector inputs, allowing the MIC2778 to be powered from a downstream supply, such a boost converter. Supply current is extremely low (1µA, typical), making it ideal for portable applications. A high-precision 1% grade is available. The MIC2778 is supplied in Micrel's IttyBitty™ 5-lead SOT-23-5 package.

产品特性
  • Optimized for PDAs, cellular telephones, pagers, and other battery-powered devices
  • Independently adjustable high- and low-voltage thresholds
  • Internal logic prevents battery-voltage-fluctuation chatter
  • High ±2% voltage threshold accuracy; 1% available
  • Built in 140ms (minimum) delay deglitches output
  • Extremely low 1µA typical supply current
  • For applications not requiring built-in delay, see MIC841
  • Immune to brief power supply transients
  • 5-lead SOT-23 package
技术参数
Parameter Name Value Value
Typical Reset Pulse Width (ms) 140 140
Reset Type Active-Low/Open-Drain Active-Low/Open-Drain
Typical Supply Current (uA) 1 1
Nominal Reset Voltage (V) 1.24 with adjustable hysteresis 1.24 with adjustable hysteresis
Product Type Single Voltage Monitor Single Voltage Monitor
文档资料
MIC2778 - Voltage Monitor with Adjustable HysteresisData Sheets11/09/2015167KB
订购型号
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC2778-1YM5-TR5SOT-23-40C to +85CT/R0.900.750.680.660.65
MIC2778-2YM5-TR5SOT-23-40C to +85CT/R0.900.750.680.660.65
器件无铅环保信息
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2778-1YM5-TR0.0174000.0490005SOT-23-NiPdAue4
MIC2778-2YM5-TR0.0174000.0490005SOT-23-NiPdAue4
MIC2778 - Voltage Monitor with Adjustable Hysteresis MIC2778