General description

LP2952 and LP2953 are micro -power voltage regulators with very low static current (usually 130 micro -safety under 1 mAh). (Typical. At the time of light load, 60 mv is 470 millivols at 250 mAh). They are very suitable for battery power supply systems. In addition, when dropping out of school, the static current will only increase slightly, thereby extending the life of the bat. LP2952 and LP2953 retain all the ideal features of LP2951, but provide higher output current, additional functions and improved shutdown functions. When the shutdown is activated. If the output voltage is lower than the supervision. Provide reverse battery protection. The internal voltage benchmark can be used for external use, providing a low T.C. reference line and a very good line load adjustment. These parts have two packaging two packages.

Features

The output voltage is adjusted from 1.23 to 29 volts

Guarantee 250 mAh output current

Very low static current

[123 ] Low pressure difference

Extremely tight line and load adjustment

Extremely low temperature coefficient

current and heat limit

Reverse battery protection

] 50 mAh (typical) output drop -down prying rod

Provide N 5V and 3.3V versions

only LP2953 version

Auxiliary comparator in cmos/ttl [123 123 ]

Compatible output level. Can be used for fault

detection, low input line detection, etc.

Application

High -efficiency linear regulator

Impurd stoppoper regulator

Low -voltage difference battery power supply regulator

Open/Customs regulation Instrument

Absolute maximum rated value (Note 1)

Storage temperature range -65 ℃ ≤TA ≤+150 degrees Celsius

Working Temperature range

LP2952i, LP2953i, LP2952AI,

LP2953ai, LP2952i-3.3,

LP2953I-3.3, LP2952ai-3.3,

LP2953ai-3.3 3.3 #8722; 40 ° C ≤TJ ≤+125 ° C

lp2953am 55 ℉ C ≤TA ≤+125 degrees Celsius

Lead temperature. (Welding, 5 seconds) 260 degrees Celsius

Power Consumption (Note 2) Internal limitation

The highest knot temperature

LP2952i, LP2953i, LP2952AI,

LP2953ai, LP2952i-3.3,

LP2953i-3.3, LP2952ai-3.3,

lp2953ai-3.3+125 degrees Celsius [ 123]

LP2953AM+150 degrees Celsius

Input power supply voltage -20V to+30V

Feedback Input voltage (Note 3) – 0.3V to+5V

comparator Input voltage (Note 4) – 0.3V to+30V

The input voltage of the stop (Note 4) – 0.3V to+30V

The output voltage of the comparator (Note 4) -0.3V to+ 30V

Static discharge rated value (Note 15) 2 kV

The electrical characteristics limit in the standard font is suitable for TJ 25 ° C, and the thick body font is suitable for the entire working temperature range. By using standard statistics to produce or related technologies to ensure the limit quality control (SQC) method. Unless there are other regulations: For 5V parts, VIN VO (NOM)+1V, IL 1MA, CL 2.2μF, and 3.3V components are 4.7 μF. The feedback foot is connected to the V -shaped tube foot, and the output tube foot is connected to the foot of the output detection tube.

Electric characteristics

The limit value of the standard font is tj 25 degrees Celsius, and the thick body font is suitable for the entire working temperature range. Use the standard statistical quality control (SQC) method to ensure the limit through production testing or related technologies. Unless there are other regulations: For 5V components, VIN VO (NOM)+1V, IL 1MA, CL 2.2μF, for 3.3V components, IL 4.7μF. The feedback pin is connected to the foot of the tube with V, and the output tube foot is connected to the feet of the output detection tube.

All voltage options (continued)

Electrical characteristics (continued)

The limit value of the standard font is tj 25 degrees Celsius, coarse The body font is suitable for the entire work temperature range. Use the standard statistical quality control (SQC) method to ensure the limit through production testing or related technologies. Unless there are other regulations: For 5V components, VIN VO (NOM)+1V, IL 1MA, CL 2.2μF, for 3.3V components, IL 4.7μF. The feedback pin is connected to the foot of the tube with V, and the output tube foot is connected to the feet of the output detection tube.

All voltage options (sequel)

Electric characteristics (continued)

Note 1: Absolutely maximum rated value indicates that it may cause parts to cause components to cause components. Damage limit. ActThe equipment exceeds its rated working conditions.

Note 2: The maximum allowable power consumption is the maximum knot temperature TJ (MAX), pair of environmental thermal resistance θj –A, environmental temperature, TA. The maximum allowable power loss at any ambient temperature is

exceeding the maximum allowable power consumption will cause the mold temperature to enter the hot shutdown state. See the application of an additional information about heat dissipation and heat resistance.

Note 3: When used in the dual power system, when the regulator load is returned to the negative power supply, the output voltage must be fixed on the ground by the diode.

Note 4: It may exceed the input power voltage.

Note 5: The output or reference voltage temperature coefficient is defined as the worst case, the voltage change is divided by the total temperature range.

Note 6: The load adjustment is measured by using a low -occupying ratio pulse test under constant knot temperature. Two separate tests were performed, one for 100 Weian to 1 milliang, and one mia to 250 mA. There was one. The thermal regulation specification covers the output voltage changes caused by heating effects.

Note 7: The leakage voltage is defined as the input output difference. Under the input output difference, the output voltage drops 100 millivolves, which is lower than the value measured by 1 volts. The programming output voltage value is very low, and the minimum value of the input voltage must be 2V (the temperature is too high 2.3V).

Note 8: The ground pins current is the static current of the regulator. The total current from the power supply is the ground pins current, the output load current, and the current of the external resistor division (if used).

Note 9: vShutdown≤1.1V, vout vo (nominal).

Note 10: Thermal regulation refers to changes in the output voltage at the time of T at the time after the power dissipation changes, excluding the load or line adjustment effect. Specification

For the load pulse of 200 mAh, in VIN VO (NOM)+15V (3W pulse), T 10 milliseconds.

Note 11: Connect 0.1 μF capacitors from the output end to the feedback pin.

Note 12: VREF≤VOUT ≤ (vin 1V), 2.3V ≤Vin ≤ 30V, 100μA≤il ≤ 250 mAh.

Note 13: Two individual tests are performed, one test range is 2.5V ≤Vin≤VO (NOM)+1V, and the other test range is VO (NOM)+1V ≤Vin ≤ 30V.

Note 14: The threshold of the comparator is represented by the feedback end voltage difference between the nominal voltage measured at VIN VO (NOM)+1V. If the output voltage changes should be represented by these thresholds, multiplied by an error amplifier gain, that is, VOUT/VREF (R1+R2)/R2 (Reference Figure 4).

Note 15: Human model, 200 PF discharge through 1.5 kΩ.

Note 16: Drive off the pin and TTL or CMOS low level off the regulator, and open the regulator at a high level.

Note 17: Military RETS specifications can be provided according to the requirements.

Typical performance features

Unless there are other regulations: vehicle identification number 6V, IL 1 mAh, CL 2.2μF, voltage stability 3V, temperature stability 25 ℃, 25 ℃, 25 ℃, 25 ℃, 25 ℃, 25 ° C. Voltage stability 5V.

Program prompt

The maximum allowable skill of the radiator (industrial temperature ranging device) LP2952 Consumption/LP2953 Due to the highest -end temperature limit (+125 degrees Celsius) and external factors that determine the speed of the speed, the heat flows out of the part: ambient temperature and specific application. Industrial temperature range (-40 303C ≤TJ≤+125 303C) parts use plastic impregnation and surface paste to manufacture packaging containing copper quotes frames to effectively transmit heat from the mold, through the ground pins of the integrated circuit, and the PC's PC's Copper thread. The detailed information of using PC plate copper plates is as follows. To determine whether the radiator is required, the maximum power must calculate the P (MAX) of the regulator. It is important to remember that if the regulator is a transformer connected to the AC line, the maximum AC input voltage must be used (because the program will reduce the maximum DC input voltage to the regulator). Figure 1 shows the existing voltage and current on the track. The calculation formula of the power difference of the regulator is shown in Figure 1:

The next parameter that must be calculated is the maximum allowed to allow the temperature rise TR (MAX). This is calculated formula: TR (MAX) TJ (MAX) – TA (MAX) θ (J -–a) TR (MAX)/P (MAX) formula: TJ (MAX) is the maximum allowed connection point Temperature TA (MAX) is the required value of the calculation value of the maximum ambient temperature using TR (MAX) and P (MAX) to the requirements of the environmental thermal resistance, θ (J -A), now you can find: the radiator is made of PC plate copper made of copper Completed. The heat from the mold through the mold (in part), and the pins welded to the PC board. Table 1 gives the tube feet for thermal conductivity.

FIG. 2 shows that it can be used to dissipate heat from LP2952 and LP2953. Table 2 shows the L and W values of 1 ounce of copper in the pair of environmental thermal resistance (θJ-A).

The radiator requirements (military temperature ranging device) maximum allowable power consumption LP2953AMJ is limited by the highest temperature (+150 degrees Celsius) and and the degree Two parameters that determine speed from the mold flow out of the mold: ambient temperature and componentConnection with environmental heat resistance.

Application prompt (continued)

Military temperature range (-55 303C ≤TJ≤+150 303C) is made of ceramic impregnation packaging, which contains the Kovar lead framework (different from industrial parts, different, different, different, different, different, as industrial parts, Industrial parts have a copper quotation framework). Cocoa materials are necessary to achieve the sealing of military applications. The thermal conductivity of the Koval DRAT framework is not as good as that of copper, which means that PC plate copper cannot be used to significantly reduce the thermal resistance part of the LP2953AMJ application with the surrounding environment. The power consumption calculation in military applications is the same as the previous cross -section. Except for an important exception: the value of the θ (j –A), the connection with environmental thermal resistance is fixed at 95 ° C/W. Change the pattern on the computer board. This leads to an important fact: the maximum allowable power consumption in any application depends on the ambient temperature:

Figure 3 shows the relationship between the maximum allowable power difference between LP2953AMJ and the environmental temperature of the environmental temperature Figure 95∏C/W value of θ (j –A) is assumed that the maximum value connection temperature is 150 ° C (note: the maximum ambient temperature in a given application must always be used to calculate the maximum allowable power to dissipate) [123 ] External capacitors

In the output pin and ground to ensure that the output is set to 5V when the output is stable. Without this capacitor, parts will oscillate. Most types of or aluminum electrolytes will work here. Film types will be useful, but more expensive. Many alum electrolyte contains electrolytes frozen at -30 ° C. This requires the important parameter of a solid cavior below-25 degrees Celsius. Or 30 times from 25 degrees Celsius to -30 degrees Celsius). The value of this capacitor can be increased infinitely. When the output current is low, the output capacitance is smaller and stable. The capacitor can be reduced to 0.68 micro F when the current is less than 10 mAh, and the current is less than 10 mAh 0.22 micro F below 1 mA.

Programming running an output with a voltage below 5V requires more output capacitors to stabilize. At least 4.7 μF is required at 3.3V output. In the worst case of 1.23V output and 250 mAh output, the load current should be used at 6.8μF (or larger) capacitors. From the input pins to the input and AC filter capacitor or if you use a battery input. The feedback terminals can cause unstable. When using High, the external resistance value is most likely to have this problem to set the output voltage. Adding 100 PF capacitors between the output and feedback pins and adding the output capacitor to 6.8 μF (or larger) will solve the problem. The minimum load should be used when the output voltage is used to set the output voltage with the external resistance. It is recommended to provide a resistor with a minimum load. It should be noted that the minimum load current is in a fewElectrical characteristics test conditions, so the use value must be used to obtain the correlation restrictions of these tests.

Output voltage programming

The regulator can use its internal resistor division, and the feedback of the output and induction tube feed Together. Alternatively, it can be programmed at 1.23V reference voltage and 30V maximum rated voltage external resistance (see Figure 4). The complete formula of the output voltage is:

Among them, VREF is 1.23V reference voltage, IFB is the feedback voltage pins bias current (typical value is -20 mAh). The recommended minimum load current is 1 micro -peace, and the upper limit of the setting is 1.2 MΩ. When the regulator must work with the regulator, the value of the R2 (see the minimum load). IFB will generate a typical 2%of the VOUT error that can be eliminated at room temperature by trimming R1. In order to obtain better accuracy, select R2 100 KΩ to reduce this error while increasing the resistance to 0.17%of the program current to 12 micro -safety. Because the typical static current is 120 Weire, the increased current can be ignored.

The missing voltage of the leak

The leakage voltage of the voltage regulator is defined as the minimum input output voltage difference required for the output voltage of 100 millivolttilow range Measure with 1V differential measurement. The voltage drop depends on the programming output voltage. The comparator of the drop detection comparator generates a logic low "