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MIC2778

Voltage Monitor with Adjustable Hysteresis

Status: In Production

Features:

  • 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 requiring open-drain output, see MIC2778/MIC833
  • Immune to brief power supply transients
  • 5-lead SOT-23 package
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The MIC2779 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 or 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 requiring open-drain output, see MIC2778/MIC833.

The IC's power supply input is separate from the detector inputs, allowing the MIC2779 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 MIC2779 is supplied in IttyBitty™ 5-lead SOT-23-5 package.

Additional Features
    • 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 requiring open-drain output, see MIC2778/MIC833
    • Immune to brief power supply transients
    • 5-lead SOT-23 package
Parametrics
Name
Value
Product Type
Supervisor
Operating Temp. Range (°C)
-40 to 85
Vcc Range (V)
1.5 - 5.5
Nominal Reset Voltage (V)
1.24 with adjustable hysteresis
Reset Type
Active Low
Output
Open-Drain
Typical Reset Pulse Width (ms)
140
Typical Supply Current (µA)
1

Documents

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC2778-1YM5-TR
0.017400
0.049000
5
SOT-23
-
NiPdAu
e4
MIC2778-2YM5-TR
0.017400
0.049000
5
SOT-23
-
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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