LMP7300 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis

September 2007
LMP7300
Micropower Precision Comparator and Precision
Reference with Adjustable Hysteresis
General Description
The LMP7300 is a combination comparator and reference
with ideal specifications for precision threshold detecting. The
precision 2.048V reference comes with a 0.25% maximum
error. The comparator features micopower (35 µW), low offset
voltage (.75 mV max), and independent adjustable positive
and negative hysteresis.
Hysteresis control for the comparator is accomplished
through two external pins. The HYSTP pin sets the positive
hysteresis and the HYSTN pin sets the negative hysteresis.
The comparator design isolates the V_IN source impedance
and the programmable hysteresis components. This isolation
prevents any undesirable interaction allowing the IC to main-
tain a precise threshold voltage during level detection.
The combination of low offset voltage, external hysteresis
control, and precision voltage reference provides an easy to
use micropower precision threshold detector.
The LMP7300 open collector output makes it ideal for mixed
voltage system designs. The output voltage upper rail is un-
constrained by V_CC and can be pulled above V_CC to a maxi-
mum of 12V. The LMP7300 is a member of the LMP^®
precision amplifier family.
Features
(For V_S = 5V, typical unless otherwise noted)
■ ^{Supply current}
13 μA
■ ^{Propagation delay}
4 μs
■ ^{Input offset voltage}
0.3 mV
■ ^CMRR
100 dB
■ ^PSRR
100 dB
■ ^{Positive and negative hysteresis control}
■ ^{Adjustable hysteresis}
1 mV/mV
■ ^{Reference voltage}
2.048V
■ ^{Reference voltage accuracy}
0.25%
■ ^{Reference voltage source current}
1 mA
■ ^{Wide supply voltage range}
2.7V to 12V
■ ^{Operating temperature range ambient −40°C to 125°C}
Applications
■ ^{Precision threshold detection}
■ ^{Battery monitoring}
■ ^{Battery management systems}
■ ^{Zero crossing detectors}
Typical Application
Micropower Precision Battery Low Voltage Detector for 3
Cell Discharge Voltage
20175646
LMP^® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 201756
20175642
www.national.com