LMV7271/LMV7275/LMV7272
Single & Dual, 1.8V Low Power Comparators with Rail-to-Rail Input
General Description
The LMV727X are rail-to-rail input low power comparators,
which are characterized at supply voltage 1.8V, 2.7V and
5.0V. They consume only 9uA supply current per channel
while achieving a 800ns propagation delay.
The LMV7271/LMV7275 (single) are available in SC70 and
SOT23 packages. The LMV7272 (dual) is available in micro
SMD package. With these tiny packages, the PC board area
can be significantly reduced. They are ideal for low voltage,
low power and space critical designs.
The LMV7271/LMV7272 both feature a push-pull output stage
which allows operation with minimum power consumption
when driving a load. The LMV7275 features an open drain
output stage that allows for wired-OR configurations. The
open drain output also offers the advantage of allowing the
output to be pulled to any voltage up to 5.5V, regardless of
the supply voltage of the LMV7275.
The LMV727X are built with National Semiconductor's ad-
vance submicron silicon-gate BiCMOS process. They all have
bipolar inputs for improved noise performance and CMOS
outputs for rail-to-rail output swing.
Features
(VS = 1.8V, TA = 25°C, Typical values unless specified).
Single or Dual Supplies
Ultra low supply current 9µA per channel
Low input bias current 10nA
Low input offset current 200pA
Low guaranteed VOS 4mV
Propagation delay 880ns (20mV overdrive)
Input common mode voltage range 0.1V beyond rails
LMV7272 is available in micro SMD package
Applications
Mobile communications
Laptops and PDA's
Battery powered electronics
General purpose low voltage applications
Typical Circuit
20064024
FIGURE 1. Threshold Detector
Part Number Single/Dual Package Output
LMV7271 Single SC70, SOT23 Push/Pull
LMV7272 Dual micro SMD Push/Pull
LMV7275 Single SC70, SOT23 Open Drain
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.
200640 SNOSA56G Copyright © 1999-2012, Texas Instruments Incorporated
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for
availability and specifications.
ESD Tolerance 2KV (Note 2)
200V (Note 6)
VIN Differential ±Supply Voltage
Supply Voltage (V+ - V)6V
Voltage at Input/Output pins V+ +0.1V, V −0.1V
Soldering Information
Infrared or Convection (20 sec.) 235°C
Wave Soldering (10 sec.) 260°C
Storage Temperature Range −65°C to +150°C
Junction Temperature (Note 4) +150°C
Operating Ratings (Note 1)
Supply Voltage Range 1.8V to 5.5V
Temperature Range (Note 3) −40°C to +85°C
Package Thermal Resistance (Note 3)
SOT23-5 325°C/W
SC-70 265°C/W
8-Bump Thin micro SMD 220°C/W
1.8V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 1.8V, V = 0V. Boldface limits apply at the temperature
extremes.
Symbol Parameter Condition Min
(Note 5)
Typ
(Note 4)
Max
(Note 5)Units
VOS Input Offset Voltage 0.3 4
6mV
TC VOS Input Offset Temperature Drift VCM = 0.9V (Note 7) 20 uV/°C
IBInput Bias Current 10 nA
IOS Input Offset Current 200 pA
ISSupply Current
LMV7271/LMV7275 9 12
14 µA
LMV7272 18 25
28 µA
ISC Output Short Circuit Current
Sourcing, VO = 0.9V
(LMV7271/LMV7272 only) 3.5 6
mA
Sinking, VO = 0.9V 4 6
VOH
Output Voltage High
(LMV7271/LMV7272 only)
IO = 0.5mA 1.7 1.74 V
IO = 1.5mA 1.47 1.63
VOL Output Voltage Low IO = −0.5mA 52 100 mV
IO = −1.5mA 166 220
VCM Input Common Mode Voltage Range CMRR > 45 dB 1.9 V
−0.1 V
CMRR Common Mode Rejection Ratio 0 < VCM < 1.8V 46 78 dB
PSRR Power Supply Rejection Ratio V+ = 1.8V to 5V 55 80 dB
ILEAKAGE Output Leakage Current VO = 1.8V (LMV7275 only) 2 pA
LMV7271/LMV7275/LMV7272
2 Copyright © 1999-2012, Texas Instruments Incorporated
1.8V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 1.8V, V = 0V, VCM = 0.5V, VO = V+/2 and RL > 1M to V.
Boldface limits apply at the temperature extremes.
Symbol Parameter Condition Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)Units
tPHL
Propagation Delay
(High to Low)
Input Overdrive = 20mV
Load = 50pF//5k 880 ns
Input Overdrive = 50mV
Load = 50pF//5k 570 ns
tPLH
Propagation Delay
(Low to High)
Input Overdrive = 20mV
Load = 50pF//5k 1100 ns
Input Overdrive = 50mV
Load = 50pF//5k 800 ns
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 2.7V, V = 0V. Boldface limits apply at the temperature
extremes.
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)Units
VOS Input Offset Voltage 0.3 4
6mV
TC VOS Input Offset Temperature Drift VCM = 1.35V (Note 7) 20 µV/°C
IBInput Bias Current 10 nA
IOS Input offset Current 200 pA
ISSupply Current
LMV7271/LMV7275 9 13
15 µA
LMV7272 18 25
28
µA
ISC Output Short Circuit Current
Sourcing, VO = 1.35V
(LMV7271/LMV7272 only) 10 15
mA
Sinking, VO = 1.35V 10 15
VOH
Output Voltage High
(LMV7271/LMV7272 only)
IO = 0.5mA 2.63 2.66 V
IO = 2.0mA 2.48 2.55
VOL Output Voltage Low IO = −0.5mA 50 70 mV
IO = −2mA 155 220
VCM Input Common Voltage Range CMRR > 45dB 2.8 V
−0.1 V
CMRR Common Mode Rejection Ratio 0 < VCM < 2.7V 46 78 dB
PSRR Power Supply Rejection Ratio V+ = 1.8V to 5V 55 80 dB
ILEAKAGE Output Leakage Current VO = 2.7V (LMV7275 only) 2 pA
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 3
2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 2.7V, V = 0V, VCM = 0.5V, VO = V+/2 and RL > 1M to V.
Boldface limits apply at the temperature extremes.
Symbol Parameter Condition Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)Units
tPHL
Propagation Delay
(High to Low)
Input Overdrive = 20mV
Load = 50pF//5k 1200 ns
Input Overdrive = 50mV
Load = 50pF//5k 810 ns
tPLH
Propagation Delay
(Low to High)
Input Overdrive = 20mV
Load = 50pF//5k 1300 ns
Input Overdrive = 50mV
Load = 50pF//5k 860 ns
5.0V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5V, V = 0V. Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)Units
VOS Input Offset Voltage 0.3 4
6mV
TC VOS Input Offset Temperature Drift VCM = 2.5V (Note 7) 20 µV/°C
IBInput Bias Current 10 nA
IOS Input Offset Current 200 pA
ISSupply Current
LMV7271/LMV7275 10 14
16 µA
LMV7272 20 27
30 µA
ISC Output Short Circuit Current
Sourcing, VO = 2.5V
(LMV7271/LMV7272 only) 18 34 mA
Sinking, VO = 2.5V 18 34
VOH
Output Voltage High
(LMV7271/LMV7272 only)
IO = 0.5mA 4.93 4.96 V
IO = 4.0mA 4.675 4.77
VOL Output Voltage Low IO = −0.5mA 27 70 mV
IO = −4.0mA 225 315
VCM Input Common Voltage Range CMRR > 45dB 5.1 V
−0.1
CMRR Common Mode Rejection Ratio 0 < VCM < 5.0V 46 78 dB
PRSS Power Supply Rejection Ratio V+ = 1.8V to 5V 55 80 dB
ILEAKAGE Output Leakage Current VO = 5V (LMV7275 only) 2 pA
LMV7271/LMV7275/LMV7272
4 Copyright © 1999-2012, Texas Instruments Incorporated
5.0V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5.0V, V = 0V, VCM = 0.5V, VO = V+/2 and RL > 1M to V.
Boldface limits apply at the temperature extremes.
Symbol Parameter Condition Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)Units
tPHL
Propagation Delay
(High to Low)
Input Overdrive = 20mV
Load = 50pF//5k 2100 ns
Input Overdrive = 50mV
Load = 50pF//5k 1380 ns
tPLH
Propagation Delay
(Low to High)
Input Overdrive = 20mV
Load = 50pF//5k 1800 ns
Input Overdrive = 50mV
Load = 50pF//5k 1100 ns
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.
Note 2: Human body model, 1.5k in series with 100pF.
Note 3: The maximum power dissipation is a function of TJ(MAX), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is
PD = (TJ(MAX) - TA)/θJA. All numbers apply for packages soldered directly into a PC board.
Note 4: Typical values represent the most likely parametric norm.
Note 5: All limits are guaranteed by testing or statistical analysis.
Note 6: Machine Model, 0 in series with 200pF.
Note 7: Offset Voltage average drift determined by dividing the change in VOS at temperature extremes into the total temperature change.
Note 8: 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. Absolute Maximum Ratings indicate junction temperature limits beyond which the device may be permanently degraded, either mechanically or electrically.
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 5
Connection Diagrams
5-Pin SOT23/SC70 (LMV7271/LMV7275)
20064023
Top View
8-Bump micro SMD (LMV7272)
20064041
Top View
(bump side down)
Ordering Information
Package Part Number Eco Plan
(Note 9)
Package
Marking Transport Media NSC Drawing
5-Pin SOT23
LMV7271MF/NOPB Green (RoHS
& no Sb/Br) C25A 1k Units Tape and Reel
MF05A
LMV7271MFX/NOPB 3k Units Tape and Reel
LMV7275MF/NOPB Green (RoHS
& no Sb/Br) C26A 1k Units Tape and Reel
LMV7275MFX/NOPB 3k Units Tape and Reel
5-Pin SC70
LMV7271MG/NOPB Green (RoHS
& no Sb/Br) C34 1k Units Tape and Reel
MAA05A
LMV7271MGX/NOPB 3k Units Tape and Reel
LMV7275MG/NOPB Green (RoHS
& no Sb/Br) C35 1k Units Tape and Reel
LMV7275MGX/NOPB 3k Units Tape and Reel
8-Bump
micro SMD
LMV7272TL/NOPB Green (RoHS
& no Sb/Br) I 01 250 Units Tape and Reel TLA08AAA
LMV7272TLX/NOPB 3k Units Tape and Reel
Note 9: Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://
www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances,
including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free
products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-
based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or
Sb do not exceed 0.1% by weight in homogeneous material).
LMV7271/LMV7275/LMV7272
6 Copyright © 1999-2012, Texas Instruments Incorporated
Typical Performance Characteristics (TA = 25°C, Unless otherwise specified).
VOS vs. VCM
20064028
VOS vs. VCM
20064029
VOS vs. VCM
20064030
Short Circuit vs. Supply Voltage
20064001
Supply Current vs. Supply Voltage (LMV7271)
20064002
Supply Current vs. Supply Voltage (LMV7272)
20064031
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 7
Supply Current vs. Supply Voltage (LMV7272)
20064032
Output Positive Swing vs. VSUPPLY
20064033
Output Negative Swing vs. VSUPPLY
20064034
Output Positive Swing vs. ISOURCE
20064035
Output Negative Swing vs. ISINK
20064036
Output Positive Swing vs. ISOURCE
20064037
LMV7271/LMV7275/LMV7272
8 Copyright © 1999-2012, Texas Instruments Incorporated
Output Negative Swing vs. ISINK
20064038
Output Negative Swing vs. ISINK
20064039
Output Positive Swing vs. ISOURCE
20064040
Propagation Delay (tPLH)
20064014
Propagation Delay (tPHL)
20064018
Propagation Delay (tPLH)
20064015
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 9
Propagation Delay (tPHL)
20064020
Propagation Delay (tPLH)
20064016
Propagation Delay (tPHL)
20064022
tPHL vs. Overdrive
20064050
tPLH vs. Overdrive
20064049
LMV7271/LMV7275/LMV7272
10 Copyright © 1999-2012, Texas Instruments Incorporated
Application Notes
BASIC COMPARATOR
A comparator is often used to convert an analog signal to a digital signal. As shown in Figure 2, the comparator compares an input
voltage (VIN) to a reference voltage (VREF). If VIN is less than VREF, the output (VO) is low. However, if VIN is greater than VREF, the
output voltage (VO) is high.
LMV7271
20064025
20064017
FIGURE 2. LMV7271 Basic Comparator
RAIL-TO-RAIL INPUT STAGE
The LMV727X has an input common mode voltage range (VCM) of −0.1V below the V to 0.1V above V+. This is achieved by using
paralleled PNP and NPN differential input pairs. When the VCM is near V+, the NPN pair is on and the PNP pair is off. When the
VCM is near V, the NPN pair is off and the PNP pair is on. The crossover point between the NPN and PNP input stages is around
950mV from V+. Since each input stage has its own offset voltage (VOS), the VOS of the comparator becomes a function of the
VCM. See curves for VOS vs. VCM in Typical Performance Characteristics section. In application design, it is recommended to keep
the VCM away from the crossover point to avoid problems. The wide input voltage range makes LMV727X ideal in power supply
monitoring circuits, where the comparators are used to sense signals close to ground and power supplies.
OUTPUT STAGE
The LMV7271 and LMV7272 have a push-pull output stage. This output stage keeps the total system power consumption to the
absolute minimum. The only current consumed is the low supply current and the current going directly into the load. When the
output switches, both PMOS and NMOS at the output stage are on at the same time for a very short time. This allows current to
flow directly between V+ and V through output transistors. The result is a short spike of current (shoot-through current) drawn from
the supply and glitches in the supply voltages. The glitches can spread to other parts of the board as noise. To prevent the glitches
in supply lines, power supply bypass capacitors must be installed. See section for supply bypassing in the Application Notes for
details.
HYSTERESIS
It is a standard procedure to use hysteresis (positive feedback) around a comparator, to prevent oscillation, and to avoid excessive
noise on the output because the comparator is a good amplifier of its own noise.
Inverting Comparator with Hysteresis
The inverting comparator with hysteresis requires a three resistor network that is referenced to the supply voltage VCC of the
comparator (Figure 3). When VIN at the inverting input is less than VA, the voltage at the non-inverting node of the comparator
(VIN < VA), the output voltage is high (for simplicity assume VO switches as high as VCC). The three network resistors can be
represented as R1||R3 in series with R2. The lower input trip voltage VA1 is defined as
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 11
When VIN is greater than VA (VIN > VA), the output voltage is low and very close to ground. In this case the three network resistors
can be presented as R2//R3 in series with R1. The upper trip voltage VA2 is defined as
The total hysteresis provided by the network is defined as
ΔVA = VA1 - VA2
A good typical value of ΔVA would be in the range of 5 to 50mV. This is easily obtained by choosing R3 as 1000 to 100 times
(R1||R2) for 5V operation, or as 300 to 30 times (R1||R2) for 1.8V operation.
20064042
FIGURE 3. Inverting Comparator with Hysteresis
LMV7271/LMV7275/LMV7272
12 Copyright © 1999-2012, Texas Instruments Incorporated
Non-Inverting Comparator with Hysteresis
A non-inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the inverting input
(Figure 4). When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up to VIN1, where VIN1 is
calculated by
When VIN is high, the output is also high. To make the comparator switch back to its low state, VIN must equal VREF before VA will
again equal VREF. VIN can be calculated by:
The hysteresis of this circuit is the difference between VIN1 and VIN2.
ΔVIN = VCCR1/R2
20064044
20064043
FIGURE 4. Non-Inverting Comparator with Hysteresis
CIRCUIT TECHNIQUES FOR AVOIDING OSCILLATIONS IN COMPARATOR APPLICATIONS
Feedback to almost any pin of a comparator can result in oscillation. In addition, when the input signal is a slow voltage ramp or
sine wave, the comparator may also burst into oscillation near the crossing point. To avoid oscillation or instability, PCB layout
should be engineered thoughtfully. Several precautions are recommended:
1. Power supply bypassing is critical, and will improve stability and transient response. Resistance and inductance from power
supply wires and board traces increase power supply line impedance. When supply current changes, the power supply line will
move due to its impedance. Large enough supply line shift will cause the comparator to mis-operate. To avoid problems, a small
bypass capacitor, such as 0.1uF ceramic, should be placed immediately adjacent to the supply pins. An additional 6.8μF or
greater tantalum capacitor should be placed at the point where the power supply for the comparator is introduced onto the
board. These capacitors act as an energy reservoir and keep the supply impedance low. In dual supply application, a 0.1μF
capacitor is recommended to be placed across V+ and V pins.
2. Keep all leads short to reduce stray capacitance and lead inductance. It will also minimize any unwanted coupling from any
high-level signals (such as the output). The comparators can easily oscillate if the output lead is inadvertently allowed to ca-
pacitively couple to the inputs via stray capacitance. This shows up only during the output voltage transition intervals as the
comparator changes states. Try to avoid a long loop which could act as an inductor (coil).
3. It is a good practice to use an unbroken ground plane on a printed circuit board to provide all components with a low inductive
ground connection. Make sure ground paths are low-impedance where heavier currents are flowing to avoid ground level shift.
Preferably there should be a ground plane under the component.
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 13
4. The output trace should be routed away from inputs. The ground plane should extend between the output and inputs to act as
a guard. This can be achieved by running a topside ground plane between the output and inputs. A typical PCB layout is shown
in Figure 5.
20064051
FIGURE 5. Typical PCB Layout
5. When the signal source is applied through a resistive network to one input of the comparator, it is usually advantageous to
connect the other input with a resistor with the same value, for both DC and AC consideration. Input traces should be laid out
symmetrically if possible.
6. All pins of any unused comparators should be tied to the negative supply.
micro SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct sunlight will cause mis-operation of the device. Light sources such as Halogen lamps can
also affect electrical performance if brought near to the device. The wavelengths, which have the most detrimental effect, are reds
and infrareds.
micro SMD MOUNTING
The micro SMD package requires specific mounting techniques, which are detailed in National Semiconductor Application Note
AN-1112.
LMV7272 micro SMD to DIP Conversion Board
To facilitate characterization and testing, a micro SMD to DIP conversion board, LMV7272TLCONV, is available. It is a 2-layer
board, with the LMV7272 mounted on the bottom layer, and a capacitor (C1, between the positive and negative supplies) added
to the top layer.
20064060
LMV7272TLCONV Diagram
LMV7271/LMV7275/LMV7272
14 Copyright © 1999-2012, Texas Instruments Incorporated
Typical Applications
UNIVERSAL LOGIC LEVEL SHIFTER
The output of LMV7275 is an unconnected drain of an NMOS device, which can be pulled up, through a resistor, to any desired
output level within the permitted power supply range. Hence, the following simple circuit works as a universal logic level shifter,
pulling up the signal to the desired level.
20064052
FIGURE 6. Logic Level Shifter
POSITIVE PEAK DETECTOR
A positive peak detect circuit is basically a comparator operated in a unity gain follower configuration, with a capacitor as a load to
maintain the highest voltage. A diode is added at the output to prevent the capacitor from discharging through the pull-up resistor,
and a 1M resistor added in parallel to the capacitor to provide a high impedance discharge path. When the input VIN increases,
the inverting input of the comparator follows it, thus charging the capacitor. When it decreases, the cap discharges through the
1M resistor. The decay time can be modified by changing the resistor. The output should be accessed through a follower circuit
to prevent loading.
20064054
FIGURE 7. Positive Peak Detector
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 15
OR'ING THE OUTPUT
Since the output is an unconnected NMOS drain, many drains can be tied together, pulled up to VDD by a single resistor to provide
an output OR'ing function. If any of the comparator outputs is pulled low the output VO goes down.
20064053
FIGURE 8. OR’ing the Outputs
LMV7271/LMV7275/LMV7272
16 Copyright © 1999-2012, Texas Instruments Incorporated
NEGATIVE PEAK DETECTOR
For the negative detector, the output transistor of the comparator acts as a low impedance current sink. Since there is no pull-up
resistor, the only discharge path will be the 1M resistor and any load impedance used. Decay time is changed by varying the
1M resistor.
20064055
FIGURE 9. Negative Peak Detector
SQUARE WAVE GENERATOR
A typical application for a comparator is as a square wave oscillator. The circuit below generates a square wave whose period is
set by the RC time constant of the capacitor C1and resistor R4. The maximum frequency is limited by the large signal propagation
delay of the comparator, and by the capacitive loading at the output, which limits the output slew rate.
20064056
20064057
FIGURE 10. Squarewave Oscillator
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 17
To analyze the circuit, consider it when the output is high. That implies that the inverted input (VC) is lower than the non-inverting
input (VA). This causes the C1 to get charged through R4, and the voltage VC increases till it is equal to the non-inverting input. The
value of VA at this point is
If R1 = R2 = R3, then VA1 = 2VCC/3
At this point the comparator switches pulling down the output to the negative rail. The value of VA at this point is
If R1 = R2 = R3, then VA2 = VCC/3
The capacitor C1 now discharges through R4, and the voltage VC decreases till it is equal to VA2, at which point the comparator
switches again, bringing it back to the initial stage. The time period is equal to twice the time it takes to discharge C1 from 2VCC/3
to VCC/3, which is given by R4C1.ln2. Hence the formula for the frequency is:
F = 1/(2·R4·C1·ln2)
LMV7271/LMV7275/LMV7272
18 Copyright © 1999-2012, Texas Instruments Incorporated
Physical Dimensions inches (millimeters) unless otherwise noted
5-Pin SOT-23
NS Package Number MF05A
5-Pin SC-70
NS Package Number MAA05A
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 19
NOTE: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION REMAINING PINS ARE NUMBERED COUNTERCLOCK-
WISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE
HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump micro SMD
NS Package Number TLA08AAA
X1 = 1.514mm X2 = 1.514mm X3 = 0.600mm
LMV7271/LMV7275/LMV7272
20 Copyright © 1999-2012, Texas Instruments Incorporated
Notes
LMV7271/LMV7275/LMV7272
Copyright © 1999-2012, Texas Instruments Incorporated 21
Notes
Copyright © 1999-2012, Texas Instruments
Incorporated
IMPORTANT NOTICE
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changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should
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