Functional description

LM9070 is a 5V, 3%accurate, 250 mmed low -2 automotive application reliability antihypertensive regulator. The regulator has a 3%output voltage voltage tolerance to the low delay resetting output logo, which can be used to restart the radiation radio frequency interference for restarting the microprocessor system. Any reason. A delayed time interval of an external capacitor programming a delayed time interval before the resetting output can return to high.

The LM9070

60V load storage transient protection of the activation function designed for automobile applications with 2 logical control inputs contains a variety of protection functions, such as heat shutdown reverse batteries. The voltage is shut down, the heat control is closed, the input of transient protection and width

Short -circuit protection and disable safety

The working temperature range.

The battery reversely protects the unique dual input logic control scheme for

Enable or disable the regulator output. The ignition switch can be connected/disconnected

Low -off static current, the maximum input 50 μA

Wide working temperature range 40 ° C to send a signal, and generate a second at the same time to generate a second second. Maintain the activity input+125 ° C, which is controlled by the system controller. This allows the system to turn off the ignition switch, to-263 and 20-needle electric surface installations. Then the system can execute the program package and then command the regulator to close

compatible with TLE4267 To-220 to achieve low static current status (maximum 60 μA).

regulator

The design technology supervisor is maintained, and the energy will not cause errors. When the signal energy is reset when it is high -electricity frequency (from 2 MHz to 400 MHz to 300 V/M, 300 V/M is 300 V/m )

(1) Absolute maximum rated value indicates the limit of damage to the device. The work rated value indicates the function of the device, but it is not ensured that specific performance restrictions are not guaranteed. See electrical characteristics for ensuring specifications and conditions.

(2) Over the maximum allowable power consumption will cause the mold temperature to be too high, and the device will enter the heat state shutdown. The θJ-A value of the to-220 package (static air, no additional heat sink) is 73 ° C/W. The validity θJ-A value of to-220 uses traditional thermal sink methods to reduce packaging.

(3) Over the maximum allowable power consumption will cause the mold temperature to be too high, and the device will enter the heat state shutdown. The θJ-A value of to-263 packaging (static air, no extra heat slices) is 80 ° C/W. The validity θJ-A value of to-263 by increasing the connection (welding)The area of u200bu200bthe printing circuit board of the packaging label can reduce the packaging. Use 1 ounce (1.4 dense ear thick) to cover the copper, without welding and covering the mold. The area of u200bu200b0.5 square inch will reduce the θJ-A to 50 ° C/W. The area of u200bu200b1.6 square-inch will reduce θJ-A to 32 ° C/W. If the printing circuit board uses a welding mold, the copper-covered area should be increased by at least 50%to maintain a similar θJ-A rated value.

Electrical features (1)

The following specifications are applicable to VCC u003d 6V to 26V, 40 ° C ≤ TA ≤125 ° C, unless there are other regulations. COUT u003d 47 μF

ESR LT; 3Ω. Cin u003d 1 μF.

(1) By designing, testing and/or statistical analysis, ensure the minimum/maximum specification of the data table.

Typical performance features

(TA u003d 25 ° C, unless there is another instructions)

] Open/level, keep activity and security lock control figure

Note: If the power supply supply provides power supply from the output voltage of the LM9070, the logic ""1"" will be tracked when the regulator is closed, the voltage level will be tracked VOUT.

LM9070 voltage regulator has been optimized for car systems based on microprocessors. Several unique design characteristics have been incorporated into the performance of many FMEA (influence analysis of failure mode).

Missing fault tolerance

Although there is no special guarantee due to the limitations of production testing, the LM9070 has been tested and showed that it will continue to provide a system reset when it is interrupted. Signal high -level radio frequency electric field energy (within the frequency range of 2 MM to 400 MM, the signal strength is as high as 300 volts/meters). This is very important for the system of vehicle safety that must continue to work normally. In order to maintain the resistance to radio frequency interference, output bypass electric container is very important (47 μF is recommended). This regulator is suitable for applications that need to be continuously connected to the battery (see Figure 21). The opening/off control of the regulator and the system can be powered by switching/off input to the battery or ignition power supply VIN. If the input is opened, the internal drop -down resistor ensures that the regulator is closed. When the regulator is turned off, the current load connects the battery power to below 60 μA. In many VIN and the application of the input pins of the opening/off/off, it is possible to connect to a long -distance wire in the system. The ESD protection of these pins has increased the small input bypass power container.

At least 10 μF output bypass electrical container is required to maintain stability (47 μF is recommended). The ESR capacitor should be less than 3Ω. It is recommended to use 1 μF or larger input capacitors to improve the transient and noise performance of the line. By maintaining activation input, the system microprocessor can keep the regulator turn on (logic ""0"" open to keep activation) after the order is turned off by the on/off input. When the system is generally stored in a programmable memory, it can be executed and spent as much as possible as required. At the end of the operation, the microcontroller will be kept at high, the regulator and the system will be closed, and then the low static current standby mode will be returned. In order to improve system reliability, the output of the regulator was considered. When the regulator is opened, the traditional current limit and heat shutdown protection regulator. However, when the regulator is closed, the ground VCC power supply to Micro (due to short -circuit regulator output) will be forced to maintain the activation input and try to maintain the activation operation mode. When the load is short, the battery consumption may be as high as 1.5A. A separate internal circuit monitoring regulator output voltage. If VOUT is less than 4V, when a short -circuit load, the activation function is logically disabled to ensure that the regulator is closed and only returned to 50 battery load μA.

The built -in traditional throwing load protection can withstand high+60V and 50V transient state. A 1KΩ resistor input is recommended to connect/control and keep the activity input in series to provide the same level of transients if needed to protect these pins. Reverse polar battery connection protection is also built -in. The output of a reverse battery LM9070 will not be more negative than a diode to the ground. This will prevent any 5 volt load circuits from damaging. For applications that do not need to control logic, the configuration of the logical foot should be shown in Figure 22. It can be used by separate devices called LM9071. LM9071 provides packaging logic functions from 5 to 220 lines, but still retains all protection functions of LM9070.

reset sign

When the output load is too large, when the output voltage drops 300 mv to 500 mv, the signal A resets the sign to Micro. This will warn the VCC power supply that may cause the system to be unpredictable. During the recovery of power -powered and from the failure state, the delayed power container is used to keep the micro -controller in the reset state within the programmable time interval, allowing the system to work voltage and clocks that must be stable before executing the code. The typical delay time interval can be estimated in the following method:

Input stability

Low -voltage stabilizer using PNP power transistors The current increased by the current (VIN LT; 5.5V). This increase is a transistor caused by the saturation characteristics of PNP (β). In order to significantly reduce the increase in current, LM9070 detects the working current when PNP enters saturation. The reduction of this input current will cause stability problems in applications with high load current ( gt; 100 mAh). When the input voltage is applied through a long wire, this actually increases a lot of inductance and input series. The decrease in the input current may generate a positive input voltage transient state that may cause PNP to be saturated. If the input voltage is kept at a saturation and unsaturated threshold at the threshold of the PNP, it may produce oscillation. Only when there is a significant series of inductors in the input power cord, and when the voltage rises, it will be observed that the decrease time of this phenomenon input power supply is very slow. If the application and removal of the input voltage is greater than 500 mv/μs, the input voltage will also be oscillation through the work descending area (VIN 3V to 5.5V).

Figure 23 with a microprocessor system regulator with a disconnection interval illustrates the system application circuit using two logical control inputs using the LM9070. Cutting/disconnected switch to connect the system power supply. After power -on, the system controller will keep the activity line set to a low level. The NPN transistor is only used to send the communication/disconnect switch to the controller and the signal of the system and the system will be turned off. When the high -electricity of the input line of the opening/customs detection is detected, the controller can perform the power failure process. The system will remain completely power -on until the controller command completely turns off the life line. Then the system is closed and returned to a very low current consumption of standby state until it is re -connected.

Heat Management

LM9070 Packaged in the TO-263 surface installation of power packages and narrow lead distance to-220. In order to obtain operations within the possible maximum load current and input voltage range, you must be careful to control the working temperature of the device. Built -in heat shutdown protection, with a threshold higher than 150 ° C. Traditional thermal sink technology can be used for TO-220 packaging. When applying 263 packaging, heat dissipation on board is important for preventing premature heat shutdings. The area under the label of more copper foil equipment will directly increase the operation of the to-263 package, thereby reducing the temperature of the device.

TO-263 Packaging (Static air, no extra heat sink) θJ-A value is rated as 80 ° C/W. Effective θJ-ATO-263 packaging value can be reduced (welding) to the package tab by increasing the connected printing circuit board area. Use 1 ounce (1.4 dense ear thick) to cover copper, no weld cover, the area of u200bu200b0.5 square inch will reduce the θJ-A to 50 ° C/W, and the area of u200bu200b1.0 square inch will reduce the θJ-ATO by 37 ° C/W And 1.6 square per-square inch can reduce θJ-A to 32 ° C/W. If the printing circuit board uses welding mask, the copper-plated area should be increased by at least 50%under the welding mask to maintain a similar θJ-A rated value. Use the double -sided PC board with welding filling pores between the two copper planes, as shown in the middle24 will improve thermal performance and optimize the required PC board area.The two-sided PC board is arranged as shown in Figure 24, with a copper layer with 1 ounce (1.4 dense ear), no welded mask and welded filling.To 43 ° C/W.