Introduction

 

As a type of linear voltage regulator, LDO (Low Dropout Regulator) precisely adjusts the output voltage through an internal feedback mechanism. Its core advantage lies in its extremely low dropout voltage characteristic. Traditional 78xx series linear voltage regulators require a dropout voltage of at least 2V to ensure stable operation. In contrast, LDO can easily achieve efficient voltage reduction with a dropout voltage of only about 200mV.

 

Industry Background

 

With the technological upgrades in fields such as new energy vehicles, industrial automation, and 5G communication, the demand for LDO, as a core component in power management, continues to expand. Analyzing from the application perspective, automotive electronics, telecommunication infrastructure, and industrial control fields play a dominant role. Especially in the automotive industry, there is an urgent need for LDOs with high reliability and wide - temperature - range adaptability. In addition, the high - density layout of 5G base stations has accelerated the R & D of low - noise and highly integrated LDOs.

 

Technologically, the LDO industry faces multiple challenges. Firstly, the balance between low power consumption and high performance remains a key issue. The quiescent current of traditional LDOs is generally in the milliampere range, which is difficult to meet the battery life requirements of portable devices. However, the latest research has reduced the quiescent power consumption to 8.2μA through load current recovery and active clamping technologies, while achieving a transient figure of merit (FoM) of 41ps, significantly improving the high - frequency load response capability. Secondly, the efficiency optimization in wide - input - voltage - range and high - dropout - voltage scenarios has become a focus. Some industrial applications require support for a wide - voltage input of 2.7V - 20V, and the heat problem during high - dropout - voltage operation urgently needs to be solved through innovative heat - dissipation designs and material innovations. In addition, the breakthrough of high - frequency noise suppression technology is particularly important. For example, a three - stage filtering architecture has increased the 120Hz ripple rejection ratio to 63dB, effectively solving the impact of electromagnetic interference on precision sensors and RF modules.

 

The domestic LDO market is rising rapidly, striving to catch up with international standards. However, there is still room for domestic breakthroughs in high - end fields, and the situation of import dependence needs to be improved. With the acceleration of the domestic substitution process, Corebai Microelectronics, a domestic R & D team, has made breakthroughs in high - voltage LDOs and multi - channel integration and launched the CBM1764 fast - transient - response 3A low - dropout linear regulator.

Product Introduction

 

The CBM1764 is a fast - transient - response 3A low - dropout linear regulator. The circuit can provide a load capacity of 3A with a dropout voltage of 340mV. Under normal operating conditions, its quiescent current is approximately 1mA; when the device is turned off, the quiescent current drops sharply to less than 1μA. The quiescent current is well - controlled, and unlike many other regulators, the quiescent current of this device does not increase under undervoltage conditions. In addition to its fast - transient - response ability, the CBM1764 also has very low output voltage noise, making it very suitable for powering noise - sensitive RF systems.

 

The CBM1764 can provide a stable operating power supply. Relay protection devices rely on a stable operating power supply to ensure their smooth operation. The LDO can convert fluctuating input voltages into stable output voltages, meeting the strict requirements of relay protection devices for power supply stability. The low - noise characteristic of the LDO can reduce the impact of power supply noise on relay protection devices, improving the measurement accuracy and reliability of the devices.

 

The CBM1764 can achieve fast - transient response. When a fault occurs in the power system, the relay protection device needs to act quickly to cut off the faulty part to protect the safe and stable operation of the power system. Relying on its excellent fast - transient - response ability, the LDO can immediately adjust the output voltage when the load current changes rapidly, ensuring that the relay protection device can act quickly and accurately.

CBM1764 Product Features

 

 Fast - transient response

 Output current: 3A

 Input - output dropout voltage: 340mV (at 3A load)

 Low noise: 40μVRMS (10Hz - 100kHz)

 1mA quiescent current

 Wide input voltage range: 2.7V - 20V

 No need for protection diodes

 Quiescent current controlled in undervoltage mode

 Fixed output voltages: 1.5V, 1.8V, 2.5V, 3.3V

CBM1764 Product Advantages

Fast - Transient Response

 

The CBM1764 is optimized for fast - transient response, which means it can quickly adapt to changes in load current and maintain the stability of the output voltage. In power systems or electronic devices, the load current may change frequently, such as when a motor starts or stops, or when an electronic device is switched on or off. These changes may cause fluctuations in the power supply voltage. The fast - transient - response ability of the CBM1764 can effectively reduce such voltage fluctuations and ensure the normal operation of the device.

 

High Output Current

This device can provide an output current of up to 3A, enabling it to meet the power requirements of many high - power devices. For example, in some high - power amplifiers, motor - drive circuits, or other electronic devices that require a large current supply, the high - output - current capability of the CBM1764 can ensure that the device has sufficient power supply, avoiding device performance degradation or failure due to insufficient current.

Low Noise

 

The CBM1764 has very low output voltage noise (40μVRMS), which is crucial for noise - sensitive applications such as RF (Radio Frequency) power applications and high - precision analog circuits. In these applications, noise may interfere with signal transmission and processing, affecting the performance and accuracy of the device. The low - noise characteristic of the CBM1764 can provide a clean power supply environment, improving the signal quality and reliability of the device.

Low Quiescent Current

 

The operating quiescent current is only 1mA, and it can be reduced to <1μA in the shutdown mode. The CBM1764 regulator exhibits an extremely low quiescent current of only 1mA in standby or light - load states, and can even drop below 1μA in the off state. This low - quiescent - current characteristic means that the CBM1764 consumes very little power in standby or light - load states, helping to extend battery life or reduce energy consumption. This is very beneficial for portable devices, battery - powered systems, or application scenarios with strict energy - consumption requirements.

Wide Input Voltage Range

 

It supports a wide input voltage range from 2.7V to 20V, enabling the CBM1764 to work in different power supply environments with strong adaptability. Whether it is powered by a battery, an adapter, or other power sources, as long as the input voltage is within this range, the CBM1764 can work normally and provide a stable power supply output for the device.

Good Protection Functions

 

It includes functions such as reverse - battery protection, current limiting, thermal limiting, and reverse - current protection. These protection functions can effectively prevent device damage caused by overvoltage, overcurrent, overheating, or reverse - current problems, improving the reliability and safety of the system.

No Need for Protection Diodes

 

In the design, there is no need for additional protection diodes, which simplifies the circuit design, reduces costs, and decreases complexity. This is of great value for some applications that are sensitive to space and cost, as it can reduce the circuit board area and the number of components.

Adjustable Output Range

 

The output voltage range can be adjusted between 1.2V and 20V. Users can select the appropriate output voltage according to different application requirements. This adjustability allows the CBM1764 to be applied to various electronic devices and systems, meeting different power requirements.

CBM1764 Product Applications

Communication Equipment

 

 In the power modules of communication base stations, routers, and other devices, the CBM1764 can provide a stable power supply for key circuits. Its fast - transient - response ability can cope with the rapid changes in load current during communication, ensuring the normal operation of the device. For example, when the data transmission volume of a communication device suddenly increases, it may cause a sudden increase in power demand. The high - output - current and low - dropout - voltage characteristics of the CBM1764 can ensure the stability of the power supply, avoiding communication interruptions or data errors caused by voltage fluctuations.

 For the power supply of the RF (Radio Frequency) part, the low - noise characteristic of the CBM1764 is particularly important, making it very suitable for powering noise - sensitive RF systems. It can provide a clean power supply for RF circuits, reducing the interference of noise on RF signals and improving communication quality and signal transmission distance.

Industrial Control and Automation

 

 In industrial control systems, the CBM1764 can provide a reliable power supply for sensors, actuators, and other devices. Its wide input voltage range enables it to adapt to different industrial power supply environments, and its high - output - current capability meets the needs of high - power devices. For example, in some automated production lines that require precise control, the CBM1764 can provide a stable power supply for controllers and drivers, ensuring the accuracy and stability of the production process.

 For portable industrial inspection devices or handheld terminals, the low quiescent current of the CBM1764 helps to extend the battery life, facilitating long - term use by on - site workers.

Consumer Electronics

 

 In consumer electronic products such as smartphones and tablets, the CBM1764 can power core components such as processors and memory. Its fast - transient - response ability and low - noise characteristic can meet the requirements of these high - performance components for power supply quality, improving the device performance and user experience.

 For some portable consumer electronic products, such as Bluetooth earphones and smartwatches, the small package and low - power - consumption characteristics of the CBM1764 are beneficial for the miniaturization design of the device and extending the battery life.

Test and Measurement Equipment

 

 In various test and measurement equipment, such as electronic loads and signal generators, the CBM1764 can provide a stable power supply for the circuit modules of the equipment, ensuring the accuracy and consistency of test results.

 For some test scenarios that require simulating different power supply conditions, the adjustable output range of 1.2V - 20V of the CBM1764 can achieve flexible power supply settings to meet different test requirements.