NSC LMP7300MA Datasheet

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 VIN 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 VCC and can be pulled above VCC to a maxi­mum of 12V. The LMP7300 is a member of the LMP

®

precision amplifier family.

Features

(For VS = 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

20175642

LMP® is a registered trademark of National Semiconductor Corporation.

© 2007 National Semiconductor Corporation 201756 www.national.com

LMP7300 Micropower Precision Comparator and Precision Reference with Adjustable

Hysteresis

Absolute Maximum Ratings (Note 1)

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 2000V
 Machine Model 200V

V

IN

Differential ±V

S

Supply Voltage (VS = V+ – V−)

13.6V
Voltage at Input/Output Pins V+ + 0.3V, V− − 0.3V

Storage Temperature Range −65°C to +150°C

Junction Temperature (Note 3) +150°C
Soldering Information

Infrared or Convection (20 sec) 235°C
 Wave Soldering Lead Temp. (10 sec) 260°C

Operating Ratings (Note 1)

Temperature Range (Note 3) −40°C to 125°C
Supply Voltage (VS = V+ – V−)

2.7V to 12V

Package Thermal Resistance (θJA (Note 3))

8-Pin SOIC 166°C/W
8-Pin MSOP 235°C/W

2.7V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, and VCM = V+/2, R

PULLUP

= 100 kΩ,

C

LOAD

= 10 pF. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

I

S

Supply Current R

PULLUP

= Open 9 12

17

μA

Comparator

V

OS

Input Offset Voltage VCM = V+/2 ±0.07 ±0.75

±2

mV

TCV

OS

Input Offset Average Drift (Note 8) 1.8

μV/°C

I

B

Input Bias Current (Note 7) |VID| < 2.5V

1.2 3

4

nA

I

OS

Input Offset Current 0.15 0.5 nA

CMRR Common Mode Rejection Ratio 1V < V

CM

< 2.7V 80 100

dB

PSRR Power Supply Rejection Ratio V+ = 2.7V to 12V 80 100 dB

V

OL

Output Low Voltage I

LOAD

= 10 mA 0.25 0.4

0.5

V

I

LEAK

Output Leakage Current Comparator Output in High State 1 pA

HC

LIN

Hysteresis Control Voltage
Linearity

0 < Ref-HYSTP,N < 25 mV 1.000

mV/V

25 mV < Ref-HYSTP,N < 100 mV 0.950

I

HYS

Hysteresis Leakage Current 1.2 3

4

nA

T

PD

Propagation Delay
(High to Low)

Overdrive = 10 mV, CL = 10 pF 12 17

μs

Overdrive = 100 mV, CL = 10 pF 4.5 7.6

Reference

V

O

Reference Voltage 2.043 2.048 2.053 V

Line Regulation VCC = 2.7V to 12V 14 80

μV/V

Load Regulation I

OUT

= 0 to 1 mA 0.2 0.5

mV/mA

TCV

REF/°C

Temperature Coefficient −40°C to 125°C 55 ppm/°C

V

N

Output Noise Voltage 0.1 Hz to 10 Hz 80

μV

PP

10 Hz to 10 kHz 100

μV

RMS

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LMP7300

5V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V, and VCM = V+/2, R

PULLUP

= 100 kΩ, C

LOAD

=

10 pF. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

I

S

Supply Current R

PULLUP

= Open 10 13

18

μA

Comparator

V

OS

Input Offset Voltage VCM = V+/2 ±0.07 ±0.75

±2

mV

TCV

OS

Input Offset Average Drift (Note 8) 1.8

μV/°C

I

B

Input Bias Current (Note 7) |VID| < 2.5V 1.2 3

4

nA

I

OS

Input Offset Current 0.15 0.5 nA

CMRR Common Mode Rejection Ratio

1 ≤ VCM ≤ 5V

80 100

dB

PSRR Power Supply Rejection Ratio V+ = 2.7V to 12V 80 100 dB

V

OL

Output Voltage Low I

LOAD

= 10 mA 0.25 0.4 V

I

LEAK

Output Leakage Current Comparator Output in High State 1 pA

HC

LIN

Hysteresis Control Voltage
Linearity

0 < Ref-V

HYS

TP,N < 25 mV 1.000

mV/V

25 mV < Ref-V

HYS

TP,N < 100 mV 0.950

I

HYS

Hysteresis Leakage Current 1.2 3

4

nA

TPD Propagation Delay

(High to Low)

Overdrive = 10 mV, CL = 10 pF 12 15

μs

Overdrive = 100 mV, CL = 10 pF 4 7

Reference

V

O

Reference Voltage 2.043 2.048 2.053 V

Line Regulation VCC = 2.7V to 12V 14 80

μV/V

Load Regulation I

OUT

= 0 to 1 mA 0.2 0.5

mV/mA

TCV

REF/°C

Temperature Coefficient −40°C to 125°C 55 ppm/°C

V

N

Output Noise Voltage 0.1 Hz to 10 Hz 80

μV

PP

10 Hz to 10 kHz 100

μV

RMS

12V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 12V, V− = 0V, and VCM = V+/2, R

PULLUP

= 100 kΩ,

C

LOAD

= 10 pF. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

I

S

Supply Current R

PULLUP

= Open 11 14

20

µA

Comparator

V

OS

Input Offset Voltage VCM = V+/2 ±0.08 ±0.75

±2

mV

TCV

OS

Input Offset Average Drift (Note 8) 1.8

μV/°C

I

B

Input Bias Current (Note 7) |VID| > 2.5V 1.2 3

4

nA

I

OS

Input Offset Current 0.15 0.5 nA

CMRR Common Mode Rejection Ratio

1V ≤ V

CM

≤ 12V

80 100

dB

PSRR Power Supply Rejection Ratio V+ = 2.7V to 12V 80 100 dB

V

OL

Output Voltage Low I

LOAD

= 10 mA 0.25 0.4 V

I

LEAK

Output Leakage Current Comparator Output in High State 1 pA

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LMP7300

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

HC

LIN

Hysteresis Control Voltage
Linearity

0 < Ref-V

+HYS

TP,N < 25 mV 1.000

mV/V

25 mV < Ref-V

+HYS

TP,N < 100 mV 0.950

I

HYS

Hysteresis Leakage Current 1.2 3

4

nA

TPD Propagation Delay

(High to Low)

Overdrive = 10 mV, CL = 10 pF 11 15

μs

Overdrive = 100 mV, CL = 10 pF 3.5 6.8

Reference

V

O

Reference Voltage TJ = 25°C 2.043 2.048 2.053 V

Line Regulation VCC = 2.7V to 12V 14 80

μV/V

Load Regulation I

OUT

= 0 to 1 mA 0.2 0.5 mV/mA

TCV

REF/°C

Temperature Coefficient −40°C to +125°C 55 ppm/°C

V

N

Output Noise Voltage 0.1 Hz to 10 Hz 80

μV

PP

10 Hz to 10 kHz 100

μV

RMS

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics
Tables.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

Note 3: The maximum power dissipation is a function of T

J(MAX)

, θJA. The maximum allowable power dissipation at any ambient temperature is

PD = (T

J(MAX)

– TA)/ θJA. All numbers apply for packages soldered directly onto a PC Board.

Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating
of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >
TA.

Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will
also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 6: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality
control (SQC) method.

Note 7: Positive current corresponds to current flowing into the device.

Note 8: Offset voltage average drift determined by dividing the change in VOS at temperature extremes, by the total temperature change.

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

8-Pin SOIC

LMP7300MA

LMP7300MA

95 Units/Rail

M08A

LMP7300MAX 2.5k Units Tape and Reel

8-Pin MSOP

LMP7300MM

C31A

1k Units Tape and Reel

MUA08A

LMP7300MMX 3.5k Units Tape and Reel

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LMP7300

Connection Diagram

8-Pin MSOP/SOIC

20175606

Top View

Pin Descriptions

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. Internal ESD diodes, connected from the +IN pin to the rails, protect the input
stage from overvoltage. If the input voltage exceeds the rails, the diodes turn on and clamp
the input to a safe level.

−IN Inverting Comparator
Input

The −IN has a common-mode voltage range from 1V above the negative rail to, and including,
the positive rail. Internal ESD diodes, connected from the −IN pin to the rails, protects the
input stage from overvoltage. If the input voltage exceeds the rails, the diodes turn on and
clamp the input to a safe level.

GND Ground This pin may be connected to a negative DC voltage source for applications requiring a dual

supply. If connected to a negative supply, decouple this pin with 0.1 µF ceramic capacitor to
ground. The internal reference output voltage is referenced to this pin. GND is the die
substrate connection.

OUT Comparator Output The output is an open-collector. It can drive voltage loads by using a pullup resistor, or it can

drive current loads by sinking a maximum output current. This pin may be taken to a
maximum of +12V with respect to the ground pin, irrespective of supply voltage.

HYSTN Negative Hysteresis Pin This pin sets the lower trip voltage VIL. The common mode range is from 1V above the

negative rail to VCC. The input signal must fall below VIL for the comparator to switch from
high to low state.

HYSTP Positive Hysteresis pin This pin sets the upper trip voltage VIH. The common mode range is from 1V above the

negative rail to VCC. The input signal must rise above VIH for the comparator to switch from
low to high state.

REF Reference Voltage

Output Pin

This is the output pin of a 2.048V band gap precision reference.

V

+

Positive Supply Terminal

The supply voltage range is 2.7V to 12V. Decouple this pin with 0.1 μF ceramic capacitor to
ground.

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LMP7300