MAX773ESD+T

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• MAX773ESD+T Application Field
• MAX773ESD+T Working Principle

Application Field

The MAX773ESD+T is a dual current-mode pulse-width modulation (DPWM) DC-DC controller that can operate up to 12 A with a single inductor and over 20 A with two or three inductors in a synchronous buck converter. The device is ideal for high-efficiency, low-voltage and high-current-load applications, such as FPGA power supplies, Distributed System architectures, VRMs, and advanced GPUs. The device uses the advanced BCD-on-SOI process, making it especially suitable for applications in high-temperature (HT) and 18V supply systems, and requires only a minimum number of external components.

The MAX773ESD+T is designed to provide optimal performance and support for a wide variety of load profiles. It also has very fast load-transient response, making it ideal for applications where load conditions are in constant flux. Additionally, the device is designed to support both type-C and type-C+ loads, providing added flexibility for a wide range of applications.

The device is designed for maximum versatility and convenience. Its integrated PWM controller, voltage-mode feedback and oscillator offer increased system stability and tighter loop control. It also features a comprehensive on-board protection system — including under-voltage lockout (UVLOs) — limiting external component count to further improve system performance.

Working Principle

The basic working principle behind the MAX773ESD+T is that it uses current-mode pulse-width modulation, along with voltage-mode feedback, to provide accurate load regulation. During normal operation, the internal PWM controller compares a reference voltage set by an external resistor divider to the output voltage, and adjusts the duty cycle accordingly. The current-sense signal, generated from the same inductor used to supply the load, is used to control the switching of the MOSFET, allowing the feedback loop to keep the output voltage within a predetermined range.

The MAX773ESD+T also features various system level controls to optimize performance. The device has an adjustable over-current protection function, which allows designers to set trip point and soft-start time to match the specific application or load profile. It also contains an integrated voltage-tracking function, which can signal the controller when the supply voltage goes below the minimum set limit. The shutdown inputs, which allow the controller to enter an energy efficient zero-current-draw standby mode, can be set externally.

Additionally, the MAX773ESD+T has the capability to be programmed through SMBus or I2C. This allows the user to modify and control operational parameters, such as current limit, soft-start time, enable/disable state and more. The device also has an integrated temperature monitor, providing an accurate indication of the device’s temperature at any given moment in time.

Overall, the MAX773ESD+T is an excellent choice for high-current applications, offering a high level of system performance, robust protection features, and adjustable control parameters. Its low external component count allows system designs to remain compact, efficient, and cost effective.

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