FAN53555UC18X

Voltage - Input (Max):	5.5V
Supplier Device Package:	20-WLCSP
Package / Case:	20-UFBGA, WLCSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	2.4MHz
Current - Output:	5A
Voltage - Output (Max):	1.23V
Voltage - Output (Min/Fixed):	0.6V
Series:	TinyBuck®
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Programmable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

FAN53555UC18X is a buck switching regulator from Fairchild Semiconductor, suitable for a wide range of applications. It is a single inductor DC/DC converter offering a low quiescent current and an integrated Power-OK output for monitoring the output voltage. It provides adjustable output voltage between 0.8V and 1.5V, with a wide input voltage range up to 18V.

DC/DC Switching Regulators

DC/DC switching regulators, also known as switched-mode power supplies, are a type of power electronic converter that operate by rapidly switching back and forth between an input source, such as a battery, and an output load. This type of power converter is able to convert a given power source’s voltage and current levels to levels suitable for the specific needs of the load. In a buck switching regulator, the output voltage is reduced by a fixed ratio, depending on the vales of the reference voltage and the output voltage; most of the energy is stored in an inductor and is released onto the output when the switch is opened.

Specifics of the FAN53555UC18X DC/DC Buck Switching Regulator

FAN53555UC18X is an integrated buck switching regulator with an input voltage range of 4.5V to 18V and an adjustable output voltage range of 0.8V to 1.5V. It features a low quiescent current of 1.8mA typical and a wide operating temperature range of -40°C to 125°C. The switching frequency can be fixed at 200kHz or adjustable up to 500kHz with the addition of an external resistor. The device includes a power-ok output for monitoring the output voltage level and a soft-start function for controlling inrush current.

Application Field

FAN53555UC18X is a versatile DC/DC buck switching regulator designed for a variety of applications, including 5V to 1.5V conversion, 3.3V to 1.2V conversion, and 3.3V to 0.9V conversion. It can be used in a wide range of applications such as industrial control, automotive, communication and consumer electronics, power management and other application requiring efficient and reliable power conversion.

Working Principle

The FAN53555UC18X buck switching regulator uses a PWM technique to generate an output voltage. The output voltage is determined by a combination of an internal 1.25V bandgap reference and an external voltage divider. A P-type MOSFET, connected to the output voltage rail through a low-value inductor, is activated and deactivated by a timer-based oscillator which creates a rectangular signal at the switch node. During the ON-state, energy is stored in the inductor and during the OFF-state, energy is injected into the load. On each cycle, a precise fraction of the input voltage is delivered to the load, depending on the voltage division ratio between the external resistors. This process is repeated numerous times until the output voltage reaches the desired level.

Conclusion

FAN53555UC18X is an integrated DC/DC buck switching regulator from Fairchild Semiconductor, suitable for a wide range of applications from 5V to 1.5V and 3.3V to 0.9V conversion. It features a wide input voltage range up to 18V, a low quiescent current of 1.8mA typical and a power-ok output for monitoring the output voltage. This device is designed for applications such as industrial control, automotive, communication and consumer electronics, power management and other applications requiring efficient and reliable power conversion.

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