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MIC2778-2BM5 Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2778-2BM5 Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 6 page January 2005 1 M9999-011405 MIC2778 Micrel MIC2778 Voltage Monitor with Adjustable Hysteresis General Description 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 inde- pendently, 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 down- stream 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 sup- plied in Micrel’s IttyBitty™ 5-lead SOT-23-5 package. Typical Application HTH R ST VDD LTH GND MIC2778 604k 1% 56k 1% 340k 1% E N OUT IN B Y P GND MIC5207-3.0BM5 100k Li-Ion Cell 470pF VOUT 3.0V 4.7µF VBAT(hi) = 3.6V VBAT(lo) = 3.1V Cellular Telephone Battery Monitor 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 not requiring built-in delay, see MIC841 • Immune to brief power supply transients • 5-lead SOT-23 package Applications • PDAs • Pagers • Cordless phones • Consumer electronics • Embedded controllers • Personal electronics Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com IttyBitty™ is a trademark of Micrel, Inc. Ordering Information Part Number Accurary Temperature Range Package Standard Marking Pb-Free Marking MIC2778-2BM5 UFB MIC2778-2YM5 UFB* 2% -40°C to +85°C SOT-23-5 MIC2778-1BM5 UFA MIC2778-1YM5 UFA* 1% -40°C to +85°C SOT-23-5 * Underscore indicates a Pb-Free part. |
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