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Part Number: MIC2779
Description: The MIC2779 is a voltage monitor-uniquely designed to detect two separate voltage thresholds-combined ...
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MIC2779
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General Description
MIC2779 General Description
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 (1A, typical), making it ideal for portable applications.
A high-precision 1% grade is available. The MIC2779 is supplied in Micrel's IttyBitty™ 5-lead SOT-23-5 package.
MIC2779 Maximum Ratings
Supply Voltage (VDD) .....................................0.3V to +7V
Input Voltages (VLTH, VHTH, V/RST, VRST) ..... 0.3V to +7V
/RST, RST Output Current (I/RST), (IRST) ...................20mA
Storage Temperature (TS) ......................65°C to +150°C
ESD Rating, Note 3 ...................................................... 2kV
Input Voltages (VLTH, VHTH, V/RST, VRST) ..... 0.3V to +7V
/RST, RST Output Current (I/RST), (IRST) ...................20mA
Storage Temperature (TS) ......................65°C to +150°C
ESD Rating, Note 3 ...................................................... 2kV
MIC2779 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 1A typical supply current
• For applications requiring open-drain output, see MIC2778/MIC833
• Immune to brief power supply transients
• 5-lead SOT-23 package
• 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 1A typical supply current
• For applications requiring open-drain output, see MIC2778/MIC833
• Immune to brief power supply transients
• 5-lead SOT-23 package
MIC2779 Typical Application
• PDAs
• Pagers
• Cordless phones
• Consumer electronics
• Embedded controllers
• Personal electronics
• Pagers
• Cordless phones
• Consumer electronics
• Embedded controllers
• Personal electronics
MIC2779 Connection Diagram
MIC2779H-1BM5
PDF/DataSheet Download
- Datasheet: MIC2779H-1BM5
- File Size: 53531 KB
- Manufacturer: MICREL [Micrel Semiconductor]
- Click here to Download
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