Functional description

(Unless otherwise explained, otherwise) LMC7215/LMC7215-Q1/LMC7225 ultra-low power of the power comparator with a power consumption of 0.7 μA power supply. They are designed to work within a wide range of power supply voltage range from 2V to 8V, from 2V to 8V. The input of the co-mode range exceeds V+and V LMC7215/LMC7215-Q1/LMC7225. This is the real advantage of the application of single power supply. High -output current driver: (@vs u003d 5V) 45 mA transmission delay (@vs u003d 5V, 10 MV LMC7215 has a push -pull output stage. This speeding gear) The 25μs characteristics allow Essence Micro 5-pin SOT-23 Packaging 闩 Locking resistance gt; 300 mAh LMC7225 has a leakage output. By connecting an external resistor LMC7215-Q1, it is a car-level product comparator that can be used as a level converter for AEC-Q100 3 qualified products. The required voltage is as high as 15V. LMC7215/LMC7215-Q1/LMC7225 is designed

Application

For low-power system

Laptural computer key parameters.

The mobile phone ensures that the entire power supply voltage range

2.7V to 5V metering system and rail pairing performance

Hand -held electronic comparator Ideal choice.

RC timer

Alarm and monitoring circuit

Window comparator, multi -resonant

[ 123]

(1) Absolute maximum rated value indicates the limit that may cause damage. The work rated value represents the expected function of the device, but the specific performance cannot be guaranteed. Ensure the standards and test conditions, see electrical characteristics.

(2) If you need military/aerospace special equipment, please contact the Texas Instrument Sales Office/dealer to obtain standardization.

(3) Human model, applicable standard MIL-STD-883, method 3015.7. Machine model, applicable standard JESD22-A115-A (ESD MM standard field charging device model, applicable standard JESD22-C101-C (JEDEC's ESD FICDM standard). For operation. Continuous short -circuit operations when the environmental temperature rises may cause more than a maximum allowable to be a 150 ° C.

(5) the maximum power consumption is TJ (MAX), θJA and TA functions. The maximum allowable power consumption temperature in any environment is ISPD u003d (tj (max) ta)/θja. All numbers are suitable for packaging directly welded to the PC board.

2.7V to 5V electrical characteristics

Unless there are other regulations, TJ u003d 25 ° C, V+u003d 2.7V to 5V, v u003d 0V, vcm u003d vo u003d v Limit+/2. The thickness restrictions are applicable at extreme temperature.

(1) Typical values u200bu200bindicate the most likely parameter specifications determined during the characterization. The actual typical value may be different over time, and it will depend on the application and configuration. The typical values u200bu200bare not tested and did not specify production materials during shipping.

(2) All limits are stipulated by the test or statistical analysis.

(3) When VS u003d 5V, CMRR measured at VCM u003d 0V ~ 2.5V and 2.5V ~ 5V, when VS u003d 2.7V, VCM u003d 0.2V ~ 1.35V, 1.35V 1.35V ~ 2.7V eliminates a larger VO at the VCM limit, and VOS is lower or opposite when VCM u003d VS/2.

2.7V to 5V electrical characteristics (continued)

Unless there are other regulations, TJ u003d 25 ° C, V+u003d 2.7V to 5V, V negative electrode u003d 0V, vcm u003d vo u003d V. All limit+/2. Black body restrictions are applicable at extreme temperature

(4) Do not shorten the output of LMC7225 to a voltage greater than 10V, otherwise it may cause damage

Typical performance Features

TA u003d 25 ° C, unless there are other regulations

Response time

According to according to Different driving volumes, delays usually delays in the ""typical features"" section between 10 μs and 200 μs, which shows that the delay time of the input preset is 100 millivol to enter the input, and then drives 1 millival in another way. By 500 millions. From high to low or from low to high changes are fast. Usually rose by 1 μs and decreased by 400 ns. In the case of a small signal input, the comparator will be as high as 25 kilo. FIG. 13 shows the worst example of sine wave input with ± 5 mv. Note that the output is delayed almost 180 °.

Noise

The gain of most comparators is quite low. When the input signal changes slowly. As a result, when differential, the output may be input near zero between high and low. The extremely high gain of these comparators, 10,000 volts/millivolt, eliminates thisquestion. Smaller than 1 μV input will drive the drive output from one orbit to another. If the input signal is noisy, the output cannot ignore the noise, unless the positive signal provides some lag feedback.

The input voltage range

The input voltage range of the input voltage of LMC7215/25 is greater than the power supply voltage, ensuring that other parts of the system cannot excessively drive input. This allows the other side to be connected to the other side of the current fluorine resistor directly to the V+line and the other end by connecting an input to the V+line and the other end. If this is the case, the resistor is in the grounding circuit. By connecting a input directly to the power supply, it is also easy to sense the power supply voltage. The input of these comparators is protected by the diodes of the two power supply. This can protect the input from these two situations and signals that severely exceed the power supply voltage. Therefore, the current flows through these. When the input voltage is hundreds of millivolttilm larger than the power supply, the right bias diode. Before that, there was basically no input current. Therefore, a large resistance may be exposed to large voltage at any input terminal, and the input current will be limited, but there is no other obvious impact. If the input current is limited by a series resistor below 5 mAh (see Figure 14), when the threshold or only zero input voltage is only as low as 5000 millivol, the detector can work resistor and comparator.

Input

As mentioned above, the input current of these comparators is almost zero. This allows very high resistance circuits to be used when using the input resistance. This also allows time-timing circuits in R-C type. This reduces the cost of the capacitor and the amount of board space used.

Capacity load

High -output current driver allows large capacitor loads to have little effect. The capacitance load is as high as 10,000pf without effect on the delay, but the transition slows down by about 3 μs.

Output current

Even if these comparators use a power current of less than 1 μA, the output can drive a very large current current. When working on 5V power, LMC7215 can provide up to 50 mA power supply. Both LMC7215 and LMC7225 can sink more than 20 mAh. (See the relationship map of the maximum IO and V power supply in the ""typical features"" section.) This large current processing capacity allows direct driver to heavy load. LEDs, beeurges and other loads can be easily drove. The push -pull output level of LMC7215 is a very important feature. This can maintain the total power consumption of the system to the absolute minimum. The only current consumed is less than 1 μA's power current and current directly enter the load. When the output is low, the pull -up resistor will not waste power. This LMC7225 is recommended only from one logic level to the level conversion function of another logic level. Among them, LMC7225 is used as a low -power alternative for old -fashioned comparators, or for multiple outputs that will be parallel to parallel.Essence

Power loss

Large output current capacity makes the maximum working knot temperature 85 ° C becoming possible or even the absolute maximum temperature of 150 ° C. The thermal resistance of 8 needle SOIC packaging is 165 ° C/W. The use of a 2.7V power supply will shorter the output to the grounding can only cause a temperature of about 5 ° C higher than the ambient temperature. The heat resistance of the 5-pin SOT-23 packaging is 325 ° C/W. Under the 2.7V power supply, the rise is only 10.5 ° C, but if the power supply is 5V and the short-circuit current is 50 mA, it will cause the temperature of 8 to increase by 41 ° C-5 pins SOT-23 Essence If the driving resistance is very low, remember this.

Shooting

In a digital circuit and comparator with pushing output, direct through is a common phenomenon stage. When the signal is applied to the output of the N channel and the P channel at the same time, this situation will occur one that turns off another transistor. (See Figure 15) If one of the output equipment has a slight response speed faster than the other, the faster one can be opened before the other is closed. In a short period of time, the power current is allowed to directly flow through two output transistors. As a result, a short -term peak current consumption consumes from supply.

LMC7215 Under the 2.7V power supply and 1.8MA power supply, the small current peak peak value of 300 μA peak in about 400NS was 400ns, 5V power supply. The peak value occurs only when the output is from high to low. It did not happen from low to high. Figure 16 and Figure 17 show the 2.7V and 5V power supply. The upper trajectory is the output voltage, and the lower trajectory is the circuit in the measured power current graph 18. If the power supply has high impedance, a 0.01μF bypass power container should be sufficient to minimize the effects of this small current pulse.

闩 Lock

In the past, most CMOS integrated circuits were easily affected by a destruction of a lock. This happened when the ESD current peak or other signals were applied to any pins of IC. The design of LMC7215 and LMC7225 is to make them have high resistance to this damage. When they have passed, when the temperature is as high as 125 ° C, the input current of any lead does not exceed 300 mA.