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PMIC - Power Management - Specialized

The MAX8893AEWV+ is a synchronous step-down switching controller designed to operate in the voltage range from 1.5V to 5.5V and has an operational temperature range from -40℃ to +85℃. This controller is optimized for use in low-voltage, automotive powertrain and industrial power supply applications. The MAX8893AEWV+ comes with an integrated 5V LDO (voltage regulator) and advanced power management features.

The MAX8893AEWV+ is a low-noise, highly efficient, and reliable step-down switching controller that provides a complete power solution. It includes a powerful switching controller for step-down conversion, a voltage regulation loop with a programmable peak current limit and adjustable operation frequency, and an LDO regulation loop with two-stage PWM ripple regulation. The device also features a thermal shutdown protection circuit, as well as short circuit protection.

Application Field

The MAX8893AEWV+ is optimized for automotive powertrain and industrial power supply applications. It is ideal for applications such as DC/DC converters, battery managers, adapter power supplies, and automotive lighting applications. It can provide high-efficiency and accuracy power regulation, while maintaining a low noise output.

The device is also suitable for applications that require minimal power component count, such as motor control systems, audio amplifiers, and telecommunication equipment. The MAX8893AEWV+ can provide both step-down and LDO converters, making it a great choice for powering up and down sensitive circuitry connected to an AC or DC power source.

Operating Mode

The MAX8893AEWV+ has two operating modes, continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In CCM, the inductor current is always in the inductor (except during a short-circuit condition). In DCM, the inductor current changes between two levels, with the inductor storing a fixed amount of energy when the inductor is not powered. Both CCM and DCM require the inductor current to be monitored and a closed loop regulation of the output voltage is used.

The MAX8893AEWV+ supports both low-side current sensing and high-side current sensing. Low-side current sensing requires the use of an external resistor and a high-side current sensing resource is integrated inside the device, making it more suitable for applications requiring higher currents. This high-side current sensing resource is also used for power-good indication and for accurate reporting of inductor current peak with programmable accuracy.

Features

The MAX8893AEWV+ is packed full of features designed to optimize performance and efficiency. It has a programmable current limit and adjustable operation frequency that allow the user to fine-tune the power supply output to achieve the best operating performance in any condition. It also has overload, short-circuit, and thermal shutdown protection to ensure safe operation.

The MAX8893AEWV+ also has an integrated power-on reset (POR) circuit and a soft start circuit, which allow for smooth start-up and shutdown of the supply. The device also includes an adjustable soft-start time, which reduces stress on the output components during start-up, as well as an enable/disable logic input for hardware ON/OFF control.

Conclusion

The MAX8893AEWV+ is an excellent solution for low-voltage, automotive powertrain, and industrial power supply applications. It provides a complete power solution with step-down and LDO converters and advanced power management features. It is packed with features such as a programmable current limit, adjustable operation frequency, overload and short-circuit protection, and power-on reset. By utilizing these features, the MAX8893AEWV+ is an ideal choice for powering up and down sensitive circuitry in a variety of applications.

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