FAN5355MP00X

Voltage - Output (Min/Fixed):	0.75V
Base Part Number:	FAN5355
Supplier Device Package:	10-MLP (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	3MHz
Current - Output:	800mA
Voltage - Output (Max):	1.54V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Programmable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The FAN5355MP00X is an integrated power management IC (PMIC) from Fairchild Semiconductor. It is a single-phase, non-isolated DC-DC buck switching regulator with an integrated internal PWM controller and high-side MOSFET. With this device, designers can efficiently regulate voltage with high power density and low external component count. This product was designed for use in various portable, battery-powered applications, including cell phones and notebook computers.

Application Field and Working Principle

The FAN5355MP00X is designed for use in various applications where an efficient, low external component count, and high power density are desirable. These applications include cell phones, notebook computers, and wireless audio systems. The FAN5355MP00X provides the accurate, repeatable, and low noise voltage regulation needed for these battery-powered devices.The device offers a ±2.5% voltage regulation and a wide input voltage range of 4.5 V to 13.2 V. It utilizes a synchronous rectifier buck topology to switch between two targeted output voltages, a low output voltage and a high output voltage. In addition, the FAN5355MP00X features an adjustable soft-start for a smooth inrush current, programmable switching frequency to minimize power dissipation, and over-temperature protection.The FAN5355MP00X is a highly integrated solution, requiring few external components, and it offers efficient output voltage regulation (up to 97%) and a low drop-out voltage (< 1.2 V). The device also offers built-in protection functions, such as current limit, short-circuit protection, and over-temperature protection.At the core of the FAN5355MP00X is the Fairchild proprietary internal PWM controller which provides excellent line and load regulation vs. temperature and voltage. The device\'s internal PWM controller also provides frequencies ranging from 300 kHz to 2.2 MHz, depending on the application, allowing designers to optimize the power efficiency of their designs. The device\'s wide input voltage range allows for operation with either a single Li-Ion cell or two Li-Ion cells.

Conclusion

The FAN5355MP00X is ideal for applications requiring an efficient, high power density and low external component count power solution. It offers a wide input voltage range, ±2.5% voltage regulation, and an adjustable soft-start for a smooth inrush current. The device\'s built-in protection functions and internal PWM controller provide the features and performance required for a wide variety of applications including portable audio systems and battery-powered devices.

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