RT4805WSC

Voltage - Input (Max):	5V
Supplier Device Package:	16-WLCSP (1.67x1.67)
Package / Case:	16-UFBGA, WLCSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	2.5MHz
Current - Output:	2A (Switch)
Voltage - Output (Max):	4.4V
Voltage - Output (Min/Fixed):	2.85V
Series:	--
Voltage - Input (Min):	1.8V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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RT4805WSC Application Field and Working Principle

Introduction

The RT4805WSC is a DC/DC switching regulator from Richtek, one of the popular Voltage Regulators and DC DC Switching Regulators. It is a high efficiency, high current, highly integrated and low cost solution for improving the efficiency and power density of a variety of products.

Application Field

The RT4805WSC is ideal for a range of applications, including mobile and telecom power, consumer electronics, automotive systems and industrial power supplies. Mobile phone applications include charging battery and powering the device. Telecom power applications include the power supply for base stations. The consumer electronics application includes audio, video, portable devices. Industrial applications include communication systems, renewable energy and other high power electronic devices.

Features

The RT4805WSC features various levels of protection, to ensure reliable operation in highly demanding environments. It also offers high efficiency, low dropout voltage, ultra-wide input voltage ranges, adjustable output voltage and current loops, adjustable PFC settings, pulse-by-pulse waveforms, and an adjustable soft-start function.

Functionality

The RT4805WSC is a high performance integrated synchronous step-down DC/DC converter. The device can achieve output voltages as low as 0.6V, up to a maximum of 5.0V, while delivering up to 5A of continuous output current. It also features low ripple and noise and adjustable output voltage, as well as a wide input voltage range of 4.75V to 18V.

Working Principle

The working principle of the RT4805WSC is based on the Maximum Demand Pulse Width Modulation (MDPWM) technology. It operates the switching frequency at 300KHz to 1MHz, adjustable through an external resistor. The robust driver circuitry is capable of operating off of a wide input voltage range.The RT4805WSC features low dropout voltage and low quiescent current. It uses current mode control to ensure fast loop response and reliable operation. The device also features a synchronous rectification circuit to reduce power loss in the form of heat. The RT4805WSC also offers various protection features, such as overvoltage protection (OVP), over current protection (OCP), under voltage protection (UVP), over temperature protection (OTP).

Conclusion

In conclusion, the RT4805WSC is a high performance, high efficiency DC/DC switching regulator from Richtek. It has an ultra-wide input voltage range, adjustable output voltage, adjustable PFC settings, pulse-by-pulse waveforms, and adjustable soft-start function. The MDPWM technology allows for a wide range of operational frequencies, while the current mode control ensures fast loop response and reliable operation. Moreover, the device is equipped with various protection features to ensure reliable operation in highly demanding environments.

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