ADP7118ARDZ

ADP7118ARDZ Application Field and Working Principle

The ADP7118ARDZ is a family of low-noise step-down DC/DC with a high input voltage that is part of the Linear Voltage Regulators (LVR) series from Analog Devices, Inc. (ADI). This Linear Voltage Regulator (LVR) series DC/DC converter solutions offer the lowest possible output voltage ripple and superior transient response, resulting in a highly efficient solution for a wide range of applications, including medical devices and imaging systems.

The ADP7118ARDZ is a high-efficiency, low-noise, step-down regulator offering precision current regulation and output voltages from 0.8 V to 3.3 V. The device includes two capacitors, an external capacitor, and an internal compensation capacitor to optimize the transient response and the output current limit accuracy. This device offers the highest peak-to-average current ratio and efficiency in the industry, with only a 2% dropout voltage.

The ADP7118ARDZ operates in both continuous and discontinuous conduction (CCM and DCM) modes. During CCM, the output voltage is regulated using peak current detection and voltage regulation. In DCM, the device utilizes constant on-time regulation, which results in greater tolerance of input voltage variations and stable transient response over line and load conditions. The device also features an internal soft-start function to ensure that the device does not exceed the specified load current limit before achieving full-load operation.

The ADP7118ARDZ features a wide operating temperature range from -40°C to +125°C. The device has an input voltage range from 0.95V to 12V, an output voltage range from 0.8V to 3.3V, and a maximum output current of 2A. The ADP7118ARDZ offers low noise and high power density, an extended temperature range, and an enable pin that can be controlled to enable or disable the device. An enable pin allows the device to be enabled when power is provided, but can be enabled by an external signal when no power is present. Furthermore, the presence of an enable pin prevents a shutdown due to overcurrent or overvoltage.

The ADP7118ARDZ offers excellent thermal stability and reliability. The device offers high power density and low component count, which can reduce BOM costs. In-line with the requirement from automated and mission-critical applications, this device supports protection features such as over-temperature, under-voltage, and over-current protection for safety implementation.

Conclusion

The ADP7118ARDZ is an excellent high-efficiency, low-noise, step-down regulator offering precision current regulation and output voltages from 0.8 V to 3.3 V. Furthermore, it offers an ideal solution for a wide range of applications due to its high peak-to-average current ratio, excellent transient response, extended temperature range, and low component count. The device also supports on-chip protection features, such as over-temperature and over-current protection, for safety implementation.