FAN49100AUC360X

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In this article, we will discuss the application field and working principle for the FAN49100AUC360X PMIC DC setup switch regulator. The FAN49100AUC360X is a 3.2V voltage booster regulator from Fairchild Semiconductor. It is an advanced DC-DC converter that integrates switching elements with low gate charge (FET only), internal soft-start and over current protection, eliminating the need for external components. The DC-DC converter has a wide input voltage range of 2.5V to 5.5V and an adjustable output voltage with a minimum of 3.1V and a maximum of 3.2V. It provides precise voltage regulation and low output noise over the 0%-100% duty cycle range with a fixed frequency of 200KHz.

The FAN49100AUC360X has a variety of applications including embedded systems, power management, communications infrastructure, portable devices, battery-powered equipment, and wireless communications. This 3.2V voltage booster regulator is suitable for single cell Li-Ion applications and is optimized for low noise and low quiescent current applications. The device can operate directly from a battery input, providing high efficiency over the full load range. With its wide input voltage range, few external components, and low power requirements, the FAN49100AUC360X is also ideal for use in space constrained applications.

The FAN49100AUC360X is designed as a non-isolated, step-up DC-DC converter. It is packaged in a tiny PowerSSO-16 package and integrates a synchronous rectifying power FET, small controller with oscillator, internal soft-start and over current protection circuitry with low gate charge. The FAN49100AUC360X also features a current mode control with a fixed frequency of 200KHz. The internal loop compensator and adjustable feedback voltage provides good load regulation and stability at any light or heavy load condition.

The working of the FAN49100AUC360X DC-DC regulator is based on the control of the gate drive of the external switches. During the switching cycle, the oscillator triggers an internal control block, which generates a gate drive to the switch. The switch then turns ON and connects the input source to the inductor. This energy stored in the inductor is then released to the output capacitor when the switch turns off. The cycle is repeated in high frequencies and the amount of energy released to the output can be controlled by the duty cycle.

The FAN49100AUC360X also has a low quiescent current of less than 40uA in stand-by mode and low external component count, making it ideal for low power applications. The integrated soft-start circuit and over current protection circuitry eliminate the need for external components and further reduce total system cost. Over current protection is accomplished by a current sense resistor, which is monitored by an internal voltage detector. If an over current condition is detected, the regulator shuts down and the output is turned off.

Overall, the FAN49100AUC360X is a 3.2V voltage booster regulator that is optimized for low noise and low quiescent current applications. It is suitable for use in embedded systems, power management, communications infrastructure, portable devices, battery-powered equipment, and wireless communications. Its wide input voltage range, small footprint, few external components, and low power requirements make it highly attractive for use in space constrained applications. Its internal loop compensator, adjustable feedback voltage and fixed frequency of 200KHz provide good load regulation and stability at any load condition.

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