LMP7300MA NSC [National Semiconductor], LMP7300MA Datasheet

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LMP7300MA

Manufacturer Part Number
LMP7300MA
Description
Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis
Manufacturer
NSC [National Semiconductor]
Datasheet

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LMP7300MAX/NOPB
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© 2007 National Semiconductor Corporation
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
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
mum of 12V. The LMP7300 is a member of the LMP
precision amplifier family.
Typical Application
LMP
Micropower Precision Battery Low Voltage Detector for 3
®
is a registered trademark of National Semiconductor Corporation.
CC
Cell Discharge Voltage
and can be pulled above V
IN
201756
source impedance
CC
to a maxi-
20175646
®
Features
(For V
Applications
Supply current
Propagation delay
Input offset voltage
CMRR
PSRR
Positive and negative hysteresis control
Adjustable hysteresis
Reference voltage
Reference voltage accuracy
Reference voltage source current
Wide supply voltage range
Operating temperature range ambient
Precision threshold detection
Battery monitoring
Battery management systems
Zero crossing detectors
S
= 5V, typical unless otherwise noted)
September 2007
−40°C to 125°C
www.national.com
20175642
2.7V to 12V
1 mV/mV
0.3 mV
100 dB
100 dB
2.048V
0.25%
13 μA
1 mA
4 μs

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LMP7300MA Summary of contents

Page 1

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 ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2)   Human Body Model   Machine Model V Differential IN Supply Voltage ( ...

Page 3

Electrical Characteristics Unless otherwise specified, all limits are guaranteed for T 10 pF. Boldface limits apply at the temperature extremes. Symbol Parameter I Supply Current S Comparator V Input Offset Voltage OS TCV Input Offset Average Drift OS I ...

Page 4

... kHz , θ . The maximum allowable power dissipation at any ambient temperature is J(MAX temperature extremes, by the total temperature change. OS Package Marking Transport Media 95 Units/Rail LMP7300MA 2.5k Units Tape and Reel 1k Units Tape and Reel C31A 3.5k Units Tape and Reel 4 Min Typ Max Units ...

Page 5

Connection Diagram Pin Descriptions Pin Description Name +IN Non-Inverting The +IN has a common-mode voltage range from 1V above the negative rail to, and including, Comparator Input the positive rail. Internal ESD diodes, connected from the +IN pin to the ...

Page 6

Typical Performance Characteristics Supply Current vs. Supply Voltage Output Low Voltage vs. Load Current Reference Voltage vs. Supply Voltage www.national.com Output Low Voltage vs. Load Current 20175639 Output Low Voltage vs. Load Current 20175633 Reference Voltage vs. Source Current 20175635 ...

Page 7

Reference Voltage vs. Sink Current Propagation Delay vs. Overdrive Voltage Propagation Delay vs. Overdrive Voltage Reference Voltage vs. Source Current 20175637 Propagation Delay vs. Overdrive Voltage 20175640 20175642 7 20175638 20175641 www.national.com ...

Page 8

Application Information GENERAL DESCRIPTION The LMP7300 is a unique combination of micropower and precision. The open collector comparator has low offset, high CMRR, high PSRR, programmable hysteresis and microamp supply current. The precision 2.048V reference provides a DAC or ADC ...

Page 9

Figure 2 shows the configuration with no hysteresis when the HYSTP and HYSTN pins are connected together to V This configuration is not recommended because it has the highest level of false triggers due to the system noise. (a) (b) ...

Page 10

Figure 4 shows the case for negative hysteresis by biasing only the HYSN pin to a voltage less than V (a) (b) FIGURE 4. Typical Configuration for Negative Hysteresis = −10 mV www.national.com The case for setting only a positive ...

Page 11

... The temperature is sensed kΩ @ 25°C Omega Precision NTC Thermistor #44008 (±0.2% tol). 11 and R potentiometers. For appli Evaluation Board Ordering ID LMP7300MA-EVAL LMP7300MM-EVAL 20175629 www.national.com ...

Page 12

PRECISION HIGH TEMPERATURE SWITCH The LMP7300 brings accuracy and stability to simple sensor switch applications. Figure 9 shows the LMP7300 setup in a high temperature switch configuration. The input bridge es- tablishes the trip point at 85°C and the reset ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 8-Pin MSOP NS Package Number MUA08A 13 www.national.com ...

Page 14

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE ...

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