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Fairchild’s Fixed Output Step-Down Switching Voltage Regulator Delivers Excellent Transient Response, Low Quiescent Current

27th September 2010

Fairchild Semiconductor

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Datasheet

In portable devices, especially smartphones, data cards and tablets, designers often need to accommodate more functionality than the PMIC can handle, such as additional I/O rails or processors. These rails and/or processors require power from a standalone device in order to function. Fairchild Semiconductor (NYSE: FCS) developed the FAN5358 , a 2MHz, 500mA, synchronous Buck regulator to meet this design challenge.

The FAN5358 is a step-down switching voltage regulator that delivers a fixed output from an input voltage supply of 2.7V to 5.5V. Using a proprietary architecture with synchronous rectification, the device is capable of delivering 500mA and maintaining a very high efficiency of over 80 percent at load currents as low as 1mA.

At moderate and light loads, the FAN5358 uses pulse frequency modulation to operate the device in power-save mode, consuming low quiescent current (25µA typical). Even with such a low quiescent current, the device provides excellent transient response during large load swings. Additionally, in shutdown mode the supply current drops below 1µA, reducing power consumption.

The FAN5358 is available in a cost-effective 6-lead SC70 package making it easy to handle, simplifying the manufacturing processes. The device is ideal for applications in cell phones, smartphones, 3G/4G data cards, as well as tablets, ultra-mobile PCs and Netbooks.

Fairchild Semiconductor enables engineers to drive innovation in their designs by offering smaller size and increased performance through advanced silicon and package options. The FAN5358 is part of a broad portfolio of devices designed to address the needs of mobile power, including core power, peripheral power, battery charging, RFPA power and lighting solutions.