Torex ldo regulator

29.03.2021 Comments

A new generation of Li rechargeable, semi solid state batteries which typically operate with a nominal voltage between 2V and 3V are now becoming common.

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These batteries can often be charged with a Constant Voltage using a simple LDO Voltage Regulator and the charging Voltage is normally set at a fixed level between 2. Utilising these batteries, a designer can realise a simple charging solution without the complexity normally associated with dedicated Li-ion charger IC. Our example solution circuit illustrates how this can be achieved. Applications include, powering small IoT devices and as a battery back up for industrial devices.

A new generation of Li-ion rechargeable batteries with a nominal voltage between 2V and 3V are now emerging and they offer many benefits over the traditional Li-Ion products. A low consumption LDO Voltage Regulator is suitable to use with a large capacity secondary batteries as load.

The following is an explanation of their operation, using the circuits in the block diagram. The battery voltage rises to the LDO voltage regulator output voltage in a short period of time after the start of charging, and then the battery is gradually charged.

It is not necessary to detect full charge, and it is generally not necessary to turn off the voltage regulator after full charge.

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Ultra-low consumption voltage detectors can be used to monitor the battery voltage. There are two main uses. This prevents malfunctions of the operation of MCU when tbattery voltage drops. It is important to be able to suppress the quiescent current to a low level after detecting. Another way to reduce current consumption is to use the output of the voltage detector and Pch SW to cut off the power supply line. If the battery voltage reaches or exceeds the release voltage of the voltage detector, a signal is output to start operation of the MCU or next-stage power supply IC.

This makes it possible to prevent the system from repeatedly turning on and off due to internal impedance and inrush current when using a secondary battery with high internal impedance. A CMOS output type, which does not require a pull-up resistor, is suitable to reduce the quiescent current while operation is stopped. With such a very simple circuit, you can create a rechargeable battery solution.

It is a very easy-to-use solution because it is possible to directly connect a Li battery with a nominal voltage of 2 to 3V to the MCU by supporting low voltage operation of the MCU.

Specifications V OUT : 3. Other points Leak Sink current from the battery is small when charging is stopped. Specifications Detect voltage: 3.The basic performances of CMOS linear regulators include output voltage accuracy, supply current, line regulation, load regulation, dropout voltage, and output voltage temperature characteristics. Because these parameters are fundamental characteristics of series regulators, there is no major difference between CMOS regulators and bipolar linear regulators.

There are various types of CMOS linear regulators depending on applications, but they can be roughly subdivided into two categories according to their performance; regulators that feature low supply current and high-speed LDO regulators that focus on transient response characteristics.

This categorization is based on the differences of the following capability to the changes of input voltage or output current, and therefore this feature is hard to be indicated by conventional DC characteristics. Hence, these days ripple rejection rate is included in the basic characteristics in order to indicate the basic performance of CMOS linear regulators. The formula of Ripple Rejection Rate is as shown below.

Graph 5 indicates the ripple rejection rate of XC series, high-speed regulators.

Also, the actual waveform is shown in Graph 6. Using the input voltage with the peak-to-peak voltage of 1V and changing frequency, you can see the changes in the ripple value of output voltage.

In Graph 1, the ripple rejection rate is dB when frequency is 1 kHz. So the output voltage will change approximately 0. But when frequency is kHz the ripple rejection rate will be 50dB, so the output ripple becomes a few mV and the changes become visible on the oscilloscope.

Another basic characteristic of linear regulators is dropout voltage, but most CMOS regulators are low dropout types that have very small dropout voltage. You can tell that the dropout voltage is remarkably small. The dropout voltage characteristics of XCx are shown in Graph 8 for your reference. For example, if you need the output current of mA using a regulator with the output voltage of 2. Recent LDO has the improved drivability of a P-ch MOSFET driver, so you are likely able to get output current up to the current limit almost without dropout, if there is certain dropout voltage.

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These days burst mode is commonly used for the digital signal processing of electronics devices, and therefore the change of load current on LSI and memory is getting larger than ever. Hence, transient response characteristics that can be compliant with the changes are now an essential quality of regulators. Transient response characteristics can be categorized as line-transient response and load transient response, and these characteristics are completely depending on the supply current of a circuit.

Let us focus attention on the error amplifier and gate capacitance value of the P-ch MOSFET load switching transistor shown in Figure 2, a basic internal circuit block diagram. The factor that determines the output impedance of the error amplifier is the supply current of a circuit; as supply current increases, the impedance becomes lower and response becomes higher speed.

As previously described, the drivability of a high-speed regulator is improved by adding a buffer. Because the buffer functions as an amplifier as well, there will be 3 sets of amplification: a preamplifier error amplifier 40dBa buffer amplifier 20dBand a load P-ch MOSFET transistor 20dB.

They form a feedback circuit with the open-loop gain of 80dB or more sensitivity and can respond to the change of output voltage in sensitive and high-speed manner. Observing the actual waveform of the load transient response in Graph 9, the voltage recovery starts within a few micro seconds after the output voltage changes, which are caused by the change of the load current.

Graph 10 compares the load transient responses between XC series and XC series, a low supply current type and a high-speed type.Add to Favourites. Finally, we would like you to leave your contact email so that we can update you on our process. View Favourites Continue Shopping. Recommended For You. AIC Analog Integrations.

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Hot Products. Please help us improving our site and product data for any errors. Type of Error:. Cancel Submit.Since linear regulators are power ICs, they normally have some kinds of protection functions. Commonly used protections are current limiter circuits and foldback circuits for overcurrent protection, and thermal shutdown circuits for heat protection. Graph 12 shows the operational characteristics example of a constant current limiter and a foldback circuit.

When output current is going to get higher than mA, the constant current limiter operates and the output voltage descends almost vertically in the graph.

As the descent continues, the foldback circuit operates and reduces the output current. Eventually the output current is decreased to 60mA, so the heat loss can be reduced as low as about mW in the case input voltage is 4. This power management function is often used to improve the efficiency of the batteries in portable electronic devices.

You can see the remained charge in a load capacitor is discharged in high speed when the CE pin voltage reaches to 0V. XCA Without high speed discharge. XCB With High speed discharge. Previous 1 2 3 4 Next.The history of CMOS linear regulators is relatively new. They have developed with battery-powered portable electronics devices. Since CMOS processes have been used in large-scale integrated circuits like LSI and microprocessors, they have been miniaturized constantly.

Taking full advantage of the miniaturization technology, CMOS linear regulators have become the power management ICs that are widely used in portable electronics products to realize low profile, low dropout, and low supply current.

In general, a CMOS linear regulator offers lower supply current compare to a bipolar linear regulator. This is because bipolar process is current-driven, while CMOS process is voltage-driven.

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Current runs between the emitter and the collector when base current is on. Base current must be on to get output current. Current runs between the source and drain when voltage is charged at the gate. Once electric charge is charged, current is not needed to turn on.

Linear regulators, which do not require clock operation, are especially suitable to attain low supply current because the operating current of the regulators can be nearly zero in the circuits other than analog operating circuits. One example of bipolar linear regulators is 78 series, multipurpose 3-pin regulators. Table 1 shows some main characteristics of the series. Still, the number of process needed for bipolar linear regulators is about a half or two thirds of CMOS process, and therefore a bipolar linear regulator is more cost-effective than a CMOS regulator even if its die-size is larger.

Thus, a bipolar linear regulator is better suited for large current or high voltage use. CMOS linear regulators are widely used in battery-powered portable electronics devices because of their low dropout and low supply current characteristics. LDO Low Dropout regulators enable battery to be used up to the limit, and therefore the regulators are now essential power management ICs for the devices like mobile phones, digital cameras, and laptop PCs to have long battery life.

Because LDO regulators feature to pull large current with small input-output voltage differential while minimizing heat losses, they can meet the wide range of current requirements of each device. Because of this feature, those types of regulators can maintain supply current of the electronics devices and wireless applications like mobile phones as low as possible when these devices are in sleep mode.

torex ldo regulator

Since these regulators can also provide the benefit of the CMOS miniaturization technology, they offer a great potential to mobile electronics devices that require low profile and high precision. Recently, ultra small packages like CSP chip scale package have also become available.

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Because the development of the power management ICs is led by the progress of mobile devices, they are typically sealed in surface-mount small packages. Picture 1 shows the representative packages. The premise of linear regulators as the power management ICs is that they are directly connected to a battery or an AC adapter, so you must pay attention to the maximum input voltage. If you choose high input voltage, then the ICs size will be bigger and its performance diminishes, and if you choose small sized ICs then you need to be careful about maximum input voltage.

There are various CMOS regulators with various maximum input voltages for different applications. You should choose the most appropriate ones by carefully examining the types of power source and desired performances of your device [See Table 2].

CMOS linear regulators can be categorized as low supply current, large current, high voltage, high-speed, LDO, and so on.

Figure 2 shows the types of output transistors. Control circuit must be higher by 0. The control circuit is operated by input power source, so dropout voltage of 0. The circuit can output large current because the base current of load transistor can be amplified by the predriver.

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There is no limit on input power source voltage in relative to output pin voltage.Add to Favourites. Finally, we would like you to leave your contact email so that we can update you on our process. View Favourites Continue Shopping. Recommended For You. Diodes Incorporated. Holtek Semicon.

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Texas Instruments. Torex Semicon. Specifications 0 products found. Show Similar. Shopping Guide. Shipping Delivery period For in stock parts, orders generally can be ready to ship within 4 hours. LCSC ships orders once a day at about 5pm except Sunday.

Once shipped, estimated delivery time depends on the below carriers you chose. Shipping tracking We will notify you by email with tracking number once order is shipped. You can also find the tracking number in order history. Parts should be unused and in original packaging.

Customer has to take charge for the shipping. Wire Transfer, available for order over USD. In Stock: More stock available by submitting a backorder.

Steps: 1. Add required quantity to cart 2. Checkout without paying. Hot Products. Please help us improving our site and product data for any errors.

torex ldo regulator

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