FAN2559S13X

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The FAN2559S13X is a highly integrated single-stage synchronous step-down regulator that combines an inductor-based DC-DC regulator and an integrated power switch and features an extensive set of features that make it suitable for a wide range of applications. This article will discuss the application field, working principle and design of the FAN2559S13X.

Application field: The FAN2559S13X is optimized for powering mid- to high-power portable electronics and other applications requiring a high efficiency, low voltage output from a wide input voltage rail. The device incorporates a high-efficiency synchronous buck converter capable of output currents up to 20 A, offering efficient step-down of total power up to 40 W from a wide input voltage range.

The device is ideal for various applications including:

• Search & projection devices
• Notebook & tablet PCs
• Industrial electronics
• Cellular phones
• Wearable electronics
• Embedded systems

The device features wide input voltage range of 4.5 V to access battery supplies, as well as reverse-battery protection. With adjustable soft-start and enable inputs, the device is suitable for applications where power sequencing is required to meet system specifications.

Working Principle: The device integrates an internal power switch with an inductor-based DC-DC buck converter, which is typically used for powering low-voltage electronics from a higher voltage source. The power switch creates a conducting path for current to flow from the input to the output via the switch. When the switch is on, energy is added to the inductor. This energy is then used to produce a regulated output voltage when the switch is turned off.

The FAN2559S13X follows a constant-on-time (COT)-style control. In COT mode, the power switch is turned on by a pulse-width modulated (PWM) signal; the current through the switch is then controlled by the COT control loop. When the switch is turned on, the voltage across the inductor linearly increases, and when the switch is turned off, the voltage stored in the inductor is returned to the output through its diode.

Design: The FAN2559S13X includes a range of features that enable designers to achieve advanced performance and optimal efficiency. The device includes an integrated power switch, dual-output current protection, a temperature sensing circuit and built-in overvoltage protection.

The integrated power switch uses a proprietary CMOS process to reduce conduction losses and maximize efficiency. The dual-output current protection circuit can detect current flow in both the inductor and the power switch, preventing damage to the circuit and system equipment in case of a fault condition.

The device also includes a temperature sensing circuit, which monitors the device temperature and adjusts the duty cycle as needed to prevent thermal runaway or over-temperature breakdowns. The overvoltage protection circuit monitors the output and shuts down the converter in case of an overvoltage condition.

The FAN2559S13X has a wide range of operating temperature, from -40°C to +125°C, and is certified under both the AEC-Q100 and RoHS specifications. The device includes built-in undocumented features such as phase-shift compensation, phase-balance control and fast transient response, which allow the converter to maintain a high efficiency over wide load, line and temperature variations.

The FAN2559S13X is a highly integrated single-stage synchronous step-down regulator that combines an inductor-based DC-DC converter and an integrated power switch and offers a wide range of features, making it suitable for a wide range of applications. The device offers an extensive set of protection functions, temperature sensing, and adjustable control parameters to help achieve optimal performance.

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