Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Comparator + voltage ref circuit CMOS, Open collector, TTL SOIC 8

INP

INN

HYSTP

HYSTN

OUT

0.1 PF

318.4 k:

GND

REF

BATT

= (TRIP @ .9V x 3 CELL)

9.86 k:

1 M:

LED

ADJUST

FOR LED

BRIGHTNESS

0 20 40 60 80 100

PROPAGATION DELAY (Ps)

OVERDRIVE VOLTAGE (mV)

-40°C

25°C

85°C

125°C

= 12V

= 10 pF

LMP7300

www.ti.com

SNOSAT7F –AUGUST 2007–REVISED MARCH 2013

Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis

Check for Samples: LMP7300

FEATURES

DESCRIPTION

The LMP7300 is a combination comparator and

• (For V

= 5V, typical unless otherwise noted)

reference with ideal specifications for precision

• Supply Current 13 μA

threshold detecting. The precision 2.048V reference

• Propagation Delay 4 μs

comes with a 0.25% maximum error. The comparator

features micropower (35 µW), low offset voltage

• Input Offset Voltage 0.3 mV

(0.75 mV max), and independent adjustable positive

• CMRR 100 dB

and negative hysteresis.

• PSRR 100 dB

Hysteresis control for the comparator is accomplished

• Positive and Negative Hysteresis Control

through two external pins. The HYSTP pin sets the

• Adjustable Hysteresis 1 mV/mV

positive hysteresis and the HYSTN pin sets the

negative hysteresis. The comparator design isolates

• Reference Voltage 2.048V

the V

source impedance and the programmable

• Reference Voltage Accuracy 0.25%

hysteresis components. This isolation prevents any

• Reference Voltage Source Current 1 mA

undesirable interaction allowing the IC to maintain a

precise threshold voltage during level detection.

• Wide Supply Voltage Range 2.7V to 12V

• Operating Temperature Range Ambient −40°C

The combination of low offset voltage, external

to 125°C

hysteresis control, and precision voltage reference

provides an easy to use micropower precision

threshold detector.

APPLICATIONS

The LMP7300 open collector output makes it ideal for

• Precision Threshold Detection

mixed voltage system designs. The output voltage

• Battery Monitoring

upper rail is unconstrained by V

and can be pulled

• Battery Management Systems

above V

to a maximum of 12V. The LMP7300 is a

• Zero Crossing Detectors member of the LMP precision amplifier family.

Typical Application

Micropower Precision Battery Low Voltage Detector for 3

Cell Discharge Voltage

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

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.

Summary of content (17 pages)

PAGE 1
LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 Micropower Precision Comparator and Precision Reference with Adjustable Hysteresis Check for Samples: LMP7300 FEATURES 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.
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LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) Human Body Model 2000V Machine Model 200V VIN Differential ±VS + − Supply Voltage (VS = V – V ) 13.6V Voltage at Input/Output Pins V+ + 0.3V, V− − 0.
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LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 2.7V Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, V+ = 2.7V, V− = 0V, and VCM = V+/2, RPULLUP = 100 kΩ, CLOAD = 10 pF. Boldface limits apply at the temperature extremes. Symbol IS Typ (3) Max (2) Units 9 12 17 μA VCM = V+/2 SOIC ±0.07 ±0.75 ±2 mV VCM = V+/2 VSSOP ±0.07 ±1.0 ±2.
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LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com 5V Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, V+ = 5V, V− = 0V, and VCM = V+/2, RPULLUP = 100 kΩ, CLOAD = 10 pF. Boldface limits apply at the temperature extremes. Symbol IS Parameter Supply Current Conditions Min (2) RPULLUP = Open Typ (3) Max (2) Units 10 13 18 μA Comparator VOS VCM = V+/2 SOIC ±0.07 ±0.75 ±2 mV VCM = V+/2 VSSOP ±0.07 ±1.0 ±2.
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LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 12V Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C, V+ = 12V, V− = 0V, and VCM = V+/2, RPULLUP = 100 kΩ, CLOAD = 10 pF. Boldface limits apply at the temperature extremes. Symbol IS Typ (3) Max (2) Units 11 14 20 µA VCM = V+/2 SOIC ±0.08 ±0.75 ±2 mV VCM = V+/2 VSSOP ±0.08 ±1.0 ±2.
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LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com CONNECTION DIAGRAM Top View +IN -IN GND OUT 1 8 2 7 3 6 4 5 + V REF HYSTP HYSTN Figure 1. 8-Pin VSSOP (See DGK Package) 8-Pin SOIC (See D Package) Pin Descriptions Symbol 6 Pin Name Description +IN Non-Inverting Comparator Input The +IN has a common-mode voltage range from 1V above the negative rail to, and including, the positive rail.
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LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 Typical Performance Characteristics Supply Current vs. Supply Voltage Output Low Voltage vs. Load Current 0.5 20 + OUTPUT LOW VOLTAGE (V) SUPPLY CURRENT (PA) V = 12V 125°C 15 85°C 25°C 10 -40°C 5 0 2 4 6 8 10 0.4 125°C 0.3 85°C 0.2 -40°C 0.1 25°C 0 0 12 2 SUPPLY VOLTAGE (V) Figure 3. Output Low Voltage vs. Load Current Output Low Voltage vs. Load Current 10 8 10 0.5 + + V = 2.
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LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) Reference Voltage vs. Sink Current 2.050 Reference Voltage vs. Source Current 2.050 + + V = 2.7V -40°C 25°C 2.049 REFERENCE VOLTAGE (V) REFERENCE VOLTAGE (V) V = 2.7V 2.048 85°C 2.047 125°C 2.049 -40°C 25°C 2.048 85°C 2.047 125°C 2.046 2.046 0 50 100 150 200 250 0 SINK CURRENT (PA) 0.5 1 1.5 Figure 8. Figure 9. Propagation Delay vs.
PAGE 9
LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 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 with an accurate binary divisible voltage. The comparator and reference combination forms an ideal single IC solution for low power sensor or portable applications.
PAGE 10
LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 VIL = VREF - VREF § R1 ¨ ¨ R + R2 1 © § ¨ ¨ © VIH = VREF + VREF § R1 ¨ ¨ R + R2 1 © www.ti.com (1) § ¨ ¨ © + V INP + - VIN RPULLUP 1 M: + OUT INN - HYSTP GND HYSTN VREF RP1 1.47 k: 1% + V 2.048V RN1 4.91 k: 1% RP2 1 M: 1% GND RN2 1 M: 1% Figure 13.
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LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 VOUT 1 OUTPUT STATE 0 VIN VREF Figure 16. Typical Configuration for No Hysteresis Figure 18 shows the configuration with symmetric hysteresis when the HYSTP and HYSTN pins are connected to the same voltage that is less than VREF. The two trip points set a hysteresis band around the input threshold voltage VREF, such that the positive band is equal to the negative band.
PAGE 12
LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com + V INP + - VIN RPULLUP 1 M: + OUT INN - HYSTP GND HYSTN VREF + V 2.048V RN1 4.91 k: 1% GND RN2 1 M: 1% Figure 19. Typical Configuration for Negative Hysteresis = −10 mV VOUT 1 OUTPUT STATE 0 VIN VREF VIL Figure 20. Typical Configuration for Negative Hysteresis = −10 mV The case for setting only a positive hysteresis is demonstrated in Figure 22.
PAGE 13
LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 VOUT 1 OUTPUT STATE 0 VIN VREF VIH Figure 22. Connections for Positive Hysteresis = +10 mV In the general case, as demonstrated with both positive and negative hysteresis bands in Figure 23, noise within these bands will have no affect on the state of the comparator output. In Example #1 the noise is well behaved and in band. The output is clean and well behaved.
PAGE 14
LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com EVALUATION BOARDS Texas Instruments provides the following PCB boards as an aid in evaluating the LMP7300 performance. Device Package Evaluation Board Ordering ID LMP7300MA 8-Pin SOIC LMP7300MA-EVAL WINDOW COMPARATOR Figure 25 shows two LMP7300s configured as a micropower window detector in a temperature level detection application. The circuit shown monitors the ambient temperature change.
PAGE 15
LMP7300 www.ti.com SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 The temperature sensor used is an Omega 44008 Precision NTC Thermistor. The 44008 has an accuracy of ±0.2°C. The resistance at 85°C is 3270.9Ω and at 80°C is 3840.2Ω. The trip voltage threshold is established by one half of the bridge, which is the ratio of RADJ and RSET. The input signal bias is set by the second half, which is the ratio of the thermistor resistance RTH and RSET.
PAGE 16
LMP7300 SNOSAT7F – AUGUST 2007 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision E (March 2013) to Revision F • 16 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 17
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