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MIC845 Datasheet, PDF (1/7 Pages) Micrel Semiconductor – Micro-Power Comparator/ Battery Monitor | |||
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MIC845
Micro-Power Comparator /
Battery Monitor
General Description
The MIC845 is a precision micro-power voltage
comparator with an on-chip 2.55V reference voltage
source.
Intended for voltage monitoring applications, the
MIC845 can be used with an external resistor divider
to detect a wide range of voltages, or without
external resistors to directly monitor voltages with its
high input impedance CMOS input.
The MIC845 incorporates a voltage reference and
comparator with fixed internal hysteresis. When the
2.55V internal threshold is crossed, the output
switches polarity.
MIC845 is available with a push-pull or open-drain
output stage. The push-pull output stage is
configured for both active high or active low output;
the open-drain output stage is only configured active
high.
Supply current is extremely low (typically 1µA),
making it ideal for portable applications.
MIC845 is supplied in Micrelâs Teeny⢠5-lead SC-
70 package.
Data sheets and support documentation can be
found on Micrelâs web site at www.micrel.com.
Teenyâ¢
Features
⢠Extremely low 1µA supply current (typical)
⢠2.55V on chip reference
⢠±2% voltage threshold accuracy
⢠Optimized for PDAs, cellular telephones, pagers,
and other battery-powered devices
⢠Open-drain output can be pulled up to 6V
regardless of supply voltage
⢠5-lead SC-70 package
Applications
⢠PDAs
⢠Pagers
⢠Cordless phones
⢠Portable electronics
⢠Motherboards
⢠Bladed servers
____________________________________________________________________________________________________
Typical Applications
VIN VDD
MIC845
VDD OUT
R1
INP GND
R2
3.3V
VOUT
Memory
power
VREF = 2.55V
2.75V < VDD < 5.5V
Lithium
Coin Cell
MIC845
VDD
INP OUT
GND
to Host
Threshold Detector with
Internal Fixed Hysteresis
Nano-Power Battery Monitor
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 2005
M9999-070505
(408) 955-1690
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