General description

lmc7215 /LMC7225 is the maximum power supply current of the ultra -low power consumption comparison. They are designed to work within a wide range of power supply voltage, from 2 to 8 volts. LMC7215/LMC7225 has a voltage range greater than the communication mode between the rail. This is a true superior supply application for single. LMC7215 has a push -pull output stage. This feature allows the power consumption when the absolute minimum number of operation drives any load. LMC7225 has a leakage output. By connecting an external resistor, the output of the comparator can be used as a level converter, which is as high as 15 volts with any expected voltage. LMC7215/LMC7225 design for low power consumption is the key parameter. The entire power supply voltage range guarantees 2.7V to 5V voltage and rail -to -rail performance, making the comparator very suitable for battery power applications.

Features

(Unless otherwise explained, it is typical)

Ultra -low power consumption 0.7 μA

Wide -range power supply voltage 2V to 8V [123 [123

]

The input co -mode range exceeds V+and V

Opening the setting range and push -pull output

High -output current driver: (@vs 5V) 45 ma

Display delay (@vs 5V, 10 MV driver) 25 μs

Micro SOT23-5 Packing

闩 Lock resistance gt; 300 mAh [123

]

Application

Notebook computer

Mobile phone

Measurement system

Handheld electronic equipment

timer

[

[ 123] Alarm and monitoring circuit

Window comparator, multi -resonant

Absolute maximum rated value (Note 1)

ESD Tolerance (Note 2) 2 KV

Differential input voltage (VCC)+0.3V to ( VCC) #8722 0.3V

Input/output pins (VCC) Voltage+0.3V to ( VCC) 0.3V

Power voltage (V+--V negative pole) 10 volts

Input the pin of the pins Current ± 5 ma

current at the output pin (Note 3) ± 30 ma

Power pins current 40 mAh

Diversion temperature (welding, 10 seconds) 260 ) C

Storage temperature range 65 ; C to+150 ; C

Jacking temperature (Note 4) 150 ; C

Work rated value (Note 1)

Power voltage 2V ≤ Vcc ≤8v

Concluding temperature range

LMC7215IM, LMC7225IM 40 ; C≤tj ≤+85 ; C thermal resistance (θja)

M Packaging, 85 ; C/W

SOT23-5 package 325 ; C/W

2.7V to 5V electrical characteristics

There are regulations, TJ 25 ; C, V+ 2.7V to 5V, v 0V, vcm vo v+/2. The thick body is limited at extreme temperature.

2.7V to 5V electrical characteristics (continued)

Unless there are other regulations, TJ 25 ; C, V+ 2.7V to 5V, V 0V, vcm vo v+/2. The thick body is limited at extreme temperature.

AC electrical characteristics

Unless there are other regulations, tj 25 ; c, v+ 5V, v 0V, vcm V+/2

Note 1: Absolute maximum rated value indicates the limit value that may cause damage. The work rated value indicates that the device is in a normal working state, but the specific performance cannot be guaranteed. Please refer to the electrical characteristics about the specifications and test conditions of the guarantee.

Note 2: Human model, 1.5 k series 100 PF.

Note 3: Applicable to single power and sub -supply operations. Continuous short -circuit operations at higher environmental temperatures can lead to more than maximum allowed temperature 150 ; C.

Note 4: The maximum power consumption is the functions of TJ (MAX), θJa, and TA. The maximum allowable power consumption at any ambient temperature is pd (TJ (maximum) ta)/θJa. All numbers are suitable for packaging directly welded to the PC board.

Note 5: Typical values represent the most likely parameter specifications.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: VCM 0V to 2.5V and 2.5V-5V. When VS 5V, VCM 0.2V to 1.35V, when VS 2.7V Test under 2.7V. This eliminates a large VOS at the VCM limit, VOS is lower or opposite at VCM vs/2.

Note 8: All measurement is performed under 10 kHz. When measuring LMC7225, 100 k upper pull resistors were used. CLOAD 50 PF, including test fixture and oscilloscope probes. The rising time of LMC7225 is a function of R-C time constant.

Note 9: The input step voltage of the measuring measurement is 100 MV.

Note 10: Do not shorten the output of LMC7225 to a voltage greater than 10V, otherwise it may cause damage.

Typical performance characteristics TA 25 ; C, unless there are other regulations

typical performance characteristics ta 25 ; Regulations (continued)

Application information

Response time

Depending on the driving volume, the delay is usually between 10 μs and 200 μs Essence The delayed curve VS OverDrive displays the delay time input when the input preset is 100 MV in the typical features section, and then drives the millivoltory in a 1 MV to 500 manner. From high to low or from low to high changes are fast. Typical increase of 1 μs and decreased by 400 ns. Under the small signal input, the comparator will provide a sine wave input square wave output frequency of up to 25 kg. Figure 1 shows the worst example, where the input applies ± 5 mv sine waves. Note that the output delays nearly 180 ;.

Noise

The gain of most comparators is quite low. When the input signal changes slowly, this allows the output to spend time between high -level and low levels. The results show that when the difference input is close to zero, the output may oscillate between high and low levels and low levels. The high gain of these comparators, 10,000 volts/MV, eliminates this problem. The input of less than 1 μV will drive the drive output from one orbit to another. If the input signal is noisy, the output cannot ignore noise unless positive feedback provides some lags.

The input voltage range

The input voltage range of LMC7215/25 is larger than that some parts of the signal system cannot be excessively driven input. This allows a current -influenza response resistor by connecting one input to the V+line and the other side. If the sensing resistor is located in the grounding back pipe. The inductive power supply voltage is also easy to connect to a direct supply by connecting an input. The input of these comparators is protected by the diode. This also protects the influence of input from static discharge as signals that grew more than the power supply voltage. Therefore, the current will flow through these positive bias diode as long as the input voltage is hundreds of dense ear than the power supply. before this, No input current. Therefore, placing a large resistor with any input series that may be exposed under large voltage, which will limit the input current, but there is no other obvious impact effect. If the input current is connected to the series resistance (see Figure 2), the threshold, or the zero -zero detector is limited to below 5 mA, its input voltage is composed of a resistor and capacitor. The input is as mentioned above, the input current of these comparators is almost zero. This allows very high resistance circuits to match the input resistance without any problems

Application information (continued)

This also allows the use of very small capacitors timing circuits in R-C type. This reduces capacitors and the amount of space used.

Capacity load

High -output current driver allows large capacitance load effects to be very small. The capacitance load of up to 10,000 PF has no effect on the delay, and it will only slow down the conversion speed by about 3 microseconds.

Output current

Even if these comparators use a power current of less than 1 μA, the output can drive a very large current. LMC7215 is a 5V power supply. Both LMC7215 and LMC7225 can sink 20 mAh. (See the characteristic part of the maximum IO and Vsupply in typical .) This large current processing capacity allows the driver to be directly loaded directly. LED, bee tweezers and other loads can be easily driven. The push -pull output level of LMC7215 is a very important feature. This can keep the total power consumption of the system absolutely minimum. The only current consumed is less than 1 μA power current and DC current enter the load. When the output is low. LMC7225 is recommended only in the following cases that require one level conversion function from one logic level to another logic level. The LMC7225 is used as a power supply for the old comparator in the lower machine circuit to replace multiple outputs in parallel.

Power loss

Large output current capacity makes it possible to exceed the maximum operating temperature 85 ; C and even may even be absolutely maximum of 150 degrees Celsius. 8 The thermal resistance of the packaging package is 165 ° C/W. The short circuit to the ground with a 2.7V power supply only causes about 5 degrees Celsius higher than the ambient temperature. The heat resistance of much SOT23-5 battery pack is 325 degrees Celsius/watt. In the case of 2.7 volt power, Wen Sheng is only 10.5 degrees Celsius, but if the power supply is 5V, the short-circuit current is 50 mAh, which will cause SO-8 to rise 41 ; C, and increase 81 ; CSOT23- 5. If the driving resistance is very low, remember this.

Shooting

Direct passing is a common phenomenon output comparator in digital circuits. There is a pull-comparator. When a signal acts on these two signals at the same time, this will happen to turn off another one in the N -channel and P channel output transistors. (See the picture3. ) If one of the output device has a slightly faster response than the other, that is, it can be opened before the other is closed. For a very short time, this allows the power current to flow directly through two output transistors. As a result, the short -term peak of the current was extracted from the supply.

LMC7215 generates a small current peak of 300 μA, the peak value is about 400ns, the power supply is 2.7V, the peak is 1.8mA400ns, and the 5V power supply. Only when the output is from high to low. When you go, it will not happen from low to high. Figure 4 and 5 show the appearance of the current pulse on 2.7V and 5V power. The upper trace is the output voltage, and the trace below is the current measured by the circuit in Figure 6 of the power supply. If the power supply has very 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 are easily damaged. Essence The reason for this is the pins of the current peak or other large signal integrated circuits. The design of LMC7215 and LMC7225 is to make them highly resistance to such damage. When they have passed the test temperature of the input current connection, when the temperature is as high as 125 ° C, the maximum current of any lead is 300 mAh.