LMP7300_14 Datasheet, PDF (1/18 Pages) Texas Instruments – Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis

LMP7300
www.ti.com
SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013
Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis
Check for Samples: LMP7300
FEATURES
1
•2 (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
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 micropower (35 µW), low offset voltage
(0.75 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 maintain 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 unconstrained by V_CC and can be pulled
above V_CC to a maximum of 12V. The LMP7300 is a
member of the LMP precision amplifier family.
Typical Application
Micropower Precision Battery Low Voltage Detector for 3
Cell Discharge Voltage
V_BATT = (TRIP @ .9V x 3 CELL)
R₁
318.4 k:
1%
R₂
1 M:
1%
INP ₊
INN
HYSTP
-
HYSTN
GND
0.1 PF
V⁺
OUT
V_REF
R_{5 ADJUST}
FOR LED
BRIGHTNESS
LED
R₃
9.86 k:
1%
R₄
1 M:
1%
30
V⁺ = 12V
25
C_L = 10 pF
20
15
10
-40°C
25°C
85°C
5
0
125°C
0
20
40
60
80 100
OVERDRIVE VOLTAGE (mV)
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2013, Texas Instruments Incorporated