FAN1540DX

Current - Output:	1.3A
Base Part Number:	FAN1540
Supplier Device Package:	D-PAK (TO-252)
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	75dB ~ 57dB (120Hz)
Current - Quiescent (Iq):	2mA
Series:	--
Voltage Dropout (Max):	1.2V @ 1.3A
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The FAN1540DX is a surface mount, variable output, synchronous step-down, regulator with integrated MOSFETs, commonly known as a synchronous buck DC/DC Regulator. This regulator brings a unique combination of features, such as wide input voltage range, high operating frequency and ultra-fast transient response, making it suitable for applications ranging from notebook computers, servers, and telecom equipment to automotive, industrial, and handheld devices.

Application field

First of all, the FAN1540DX is designed to optimize the reliability, efficiency, and size of power systems, particularly those found in mobile computing, server, and communication applications. It is an ideal choice for notebook computers, servers, and telecom systems requiring high power output and small size. The FAN1540DX can also be used in industrial and automotive applications. In automotive applications, its high operating temperature, wide input voltage range, low dropout voltage, and fast transient response make it a great choice for powering automotive electronics and sensors. The FAN1540DX is also suitable for power systems in medical, consumer, and industrial equipment.

Features

The FAN1540DX offers several features that make it attractive for many applications. It provides a wide 4.95V to 36V input voltage range and reduces the need for multiple regulators in a design. The FAN1540DX also offers current mode control for fast transient response and ultra-low output voltage tolerance. It is able to operate at up to 2MHz and can output up to 10A of current. It also offers programmable output voltage, current limit, power good and delay functions, enabling it to meet the demands of many applications. The device is designed to provide high efficiency and low output ripple, ensuring stable output performance and improved system reliability.

Working Principle

The FAN1540DX synchronous step-down regulator consists of an internal PWM controller, two external power MOSFETs, a current setting resistor, and two external compensation components. When an input voltage is applied at the input of the regulator, the internal PWM controller senses the input voltage, generates a pulse-width modulation (PWM) signal, and provides it to the gate of the synchronous power MOSFETs through the driver. The MOSFETs turn on and off in response to the PWM signal, allowing only a certain portion of the input voltage to pass through. The duty cycle of the PWM signal is determined by the feedback voltage at the output of the regulator. The input voltage is reduced by the RMS ripple current from the synchronous MOSFETs.The output voltage is regulated by comparator circuitry, which compares the feedback voltage to the reference voltage. When the output voltage drops below the reference voltage, the PWM controller increases the duty cycle of the PWM signal, increasing the portion of the input voltage that is allowed to pass through and increasing the output voltage. The current setting resistor sets the current limit of the regulator, limiting the amount of current that can be output. The current limit can be adjusted by changing the value of the current setting resistor.

Conclusion

The FAN1540DX is an ideal choice for applications requiring a surface mount, variable output, synchronous step-down regulator with integrated MOSFETs. It offers a wide 4.95V to 36V input voltage range and fast transient response, making it suitable for a wide range of applications, including mobile computing, industrial, and automotive. The FAN1540DX also offers current mode control, programmable output voltage, current limit, and delay functions, enabling it to meet the demands of many applications. With its robust design and comprehensive features, the FAN1540DX offers an excellent balance of performance, reliability, and size in an integrated solution.

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