下载
MIC841/842
Comparator with 1.25% Reference and
Adjustable Hysteresis
Teeny is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 24, 2015
Revision 5.0
General Description
The MIC841 and MIC842 are micro-power, precision-
voltage comparators with an on-chip voltage reference.
Both devices are intended for voltage monitoring
applications. External resistors are used to set the voltage
monitor threshold. When the threshold is crossed,
the outputs switch polarity.
The MIC842 incorporates a voltage reference and
comparator with fixed internal hysteresis; two external
resistors are used to set the switching threshold voltage.
The MIC841 provides a similar function with user
adjustable hysteresis; this part requires three external
resistors to set the upper and lower thresholds
(the difference between the threshold voltages being the
hysteresis voltage).
Both the MIC841 and MIC842 are available with push-pull
or open-drain output stage. The push-pull output stage is
configured either active high or active low; the open-drain
output stage is only configured active low.
Supply current is extremely low (1.5μA, typical), making it
ideal for portable applications.
The MIC841/2 is supplied in Micrel’s Teeny™ 5-pin
SC-70, 6-pin 1.6mm × 1.6mm Thin DFN (MIC841), and 4-
pin 1.2mm × 1.6mm Thin DFN (MIC842) packages.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com
.
Features
• 1.5V to 5.5V operating range
• 1.5μA typical supply current
• ±1.25% voltage threshold accuracy
• 10nA maximum input leakage current overtemperature
• 10µs propagation delay
• Externally adjustable hysteresis (MIC841)
• Internal 20mV hysteresis (MIC842)
• Output options
− Push-pull, active high
− Push-pull, active low
− Open drain, active low
• Open drain output can be pulled to 6V regardless of V
DD
• Immune to brief input transients
• Teeny 5-pin SC-70 package
• 6-pin 1.6mm × 1.6mm TDFN (MIC841)
• 4-pin 1.2mm × 1.6mm TDFN (MIC842)
Applications
• Smart phones
• PDAs
• Precision battery monitoring
• Battery chargers
Typical Application
Threshold Detection with Adjustable Hysteresis
Threshold Detector with Internal Fixed Hysteresis
