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ADI LTC2953CDD-1 Push Button On/Off Controller With Voltage Monitoring

Shenzhen Mingjiada Electronics Co., Ltd, as a world-renowned authorised independent distributor of electronic components, specialises in supplying ADI LTC2953CDD-1 Pushbutton On/Off Controllers, which provide reliable power management solutions for various electronic systems.

Product Overview and Core Features

The LTC2953CDD-1 is a high performance pushbutton on/off controller designed to manage system power through a pushbutton interface. The device integrates several advanced features to provide an elegant and reliable power management solution for modern electronic devices.

The LTC2953CDD-1 is available in a compact DFN-12 package (measuring only 3mm x 3mm) for space-constrained applications. Its wide operating voltage range (2.7V to 27V) enables it to adapt to a variety of power supply environments, while the extremely low quiescent current (only 14μA) greatly extends the endurance of battery-powered devices. These features make the LTC2953CDD-1 ideal for applications such as portable devices, industrial control systems and automotive electronics.

The core functions of the LTC2953CDD-1 include system power push-button control, input/output power monitoring, and undervoltage lockout protection. An enable output is used to switch the system power supply, while an interrupt output provides denoise button status. The interrupt output is particularly useful for menu-driven applications, where the system can be requested to perform an orderly power-down operation. This design ensures that the system can operate safely and reliably under a variety of conditions while providing an intuitive operating experience for the user.

The LTC2953CDD-1 device's built-in uncommitted power-failure comparator provides real-time input monitoring information, while a de-flashing undervoltage lockout comparator enables the system power-down procedure to be initiated gracefully.  The undervoltage lockout feature protects the system from undervoltage by preventing the system from being powered from a low-power source. Together, these protection mechanisms form a comprehensive power management system that greatly improves the reliability and lifetime of electronic devices.

The LTC2953CDD-1 also features an adjustable power supply monitor input that compares to a precise internal 0.5V reference voltage. The reset output remains low until the power monitor input is compliant for up to 200 milliseconds, ensuring that the system does not begin operation until the power supply has stabilised. This design avoids problems of system instability or data corruption that may result from power supply fluctuations.

Technical Parameters and Functional Details

As a professional power management IC, the LTC2953CDD-1 is equipped with a series of precision-designed technical parameters and functional features that enable it to excel in many application scenarios.

In terms of electrical parameters, the LTC2953CDD-1 operates over a temperature range of 0°C to 70°C, making it suitable for most commercial-grade application environments. Packaged in a surface mount 12-pin DFN (3mm x 3mm), this compact package size is particularly suited to space-constrained modern electronic device designs.The LTC2953CDD-1 provides a low leakage EN output suitable for DC/DC converter control.

The LTC2953CDD-1 device is particularly well suited for power monitoring. Its adjustable power-monitor input is compared to an internal precision 0.5V reference voltage, and the reset output is held low until the power-monitor input stabilises to the required value and lasts for 200 milliseconds. This design ensures that the system will only boot up when the power supply is fully stabilised, avoiding system failures that may result from power supply fluctuations. The LTC2953CDD-1 also provides an adjustable power-down timer function that allows designers to set the appropriate power-down delay time for specific application requirements.

Protection features are another highlight of the LTC2953CDD-1. Its undervoltage lockout (UVLO) comparator gracefully handles the system power-down process, preventing the system from being powered from a low-power supply. A separate power-fail comparator then provides real-time input monitoring information to provide timely warnings when abnormal conditions are detected. Together, these protection mechanisms greatly enhance system reliability and safety. In addition, the device features ±10kV ESD HBM protection on the -P-P-B inputs for enhanced anti-static capability.

The LTC2953CDD-1's control interface is designed to be simple and efficient. An enable output is used to switch the system power supply, while an interrupt output provides denoise button status. This design is particularly well suited to systems that require user interaction, and the interrupt output can be used in menu-driven applications to request the system to perform an orderly power-down operation. The device has a threshold tolerance of only ±1.5%, ensuring highly accurate operation.

In terms of signal processing, the LTC2953CDD-1 employs advanced denoising techniques to ensure the reliability of the button input signal. Whether it is mechanical button jitter or environmental noise interference, the device can effectively filter it to provide a stable control signal. This feature is especially important in industrial environments or in applications such as automotive electronics, where there may be a high level of electrical noise.

Typical Application Scenarios

With its multi-functional integration and high reliability design, the LTC2953CDD-1 has found a wide range of applications in many fields.

Portable electronic devices are one of the main application areas for this controller. In battery-powered devices such as PDAs, portable medical devices, and handheld test instruments, the LTC2953CDD-1's low-power characteristics (only 14μA quiescent current) and wide voltage operating range (2.7V to 27V) make it an ideal power management solution.The LTC2953CDD-1 not only extends battery life, but also ensures that the device is stable under a wide range of power conditions. operation. In particular, its push-button control function provides users with an intuitive on/off operation experience, while its orderly power-off control protects important data in the device from unexpected power loss. 

Computer and server systems are also important application scenarios for the LTC2953CDD-1. In blade servers, desktops and laptops, the device provides reliable power monitoring and ordered power management. Its undervoltage lockout function prevents the system from operating with insufficient power, avoiding possible hardware damage or data loss. Meanwhile, its adjustable power monitoring and reset functions ensure that subsystems are powered up in the correct timing sequence to meet the power requirements of complex computer systems. In server applications, multiple LTC2953CDD-1s can work together to achieve a distributed power management architecture.

In industrial control systems, the LTC2953CDD-1's rugged design and protection features come in handy. Industrial environments often face challenges such as power fluctuations and electrical noise, and the device's power-fail comparator, under-voltage lockout, and ±10kV ESD protection ensure that industrial equipment operates reliably under a variety of harsh conditions. Its push-button interface also facilitates on-site operation of industrial equipment, while real-time monitoring of system status is achieved through interrupt outputs. Industrial automation equipment, PLC controllers, HMI panels, etc. can benefit from the LTC2953CDD-1's power management capabilities.

Automotive electronic systems can also take full advantage of the LTC2953CDD-1's features. Infotainment systems, advanced driver assistance systems (ADAS), body control modules, etc. in modern vehicles require reliable power management. The device's wide operating voltage range adapts to fluctuations in the automotive power system, while its ordered up and down power control protects sensitive automotive electronics from power transients. Particularly in new energy vehicles, the LTC2953CDD-1 can help manage the power states of various electronic control units to optimise energy usage efficiency.

In addition, the LTC2953CDD-1 is also suitable for consumer electronics such as smart home devices, security systems, and IoT terminals. In these applications, its small size, low power consumption and reliable push-button control features are particularly valuable. For example, in a smart door lock, the LTC2953CDD-1 manages the power supply for the entire system while providing user-operated functions via a push-button interface, while its low-power consumption ensures that the battery can operate for long periods of time.