A4450KESTR-J

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A4450KESTR-J Application Field and Working Principle

A4450KESTR-J is a low-side synchronous rectifier (SR) buck regulator from Renesas. It is classified in the Power Management IC (PMIC) group and falls under the Voltage Regulators, DC DC Switching Controllers category. This device offers an effective and efficient solution to reduce system power consumption and optimize board space, making it suitable for use in medium voltage range DC-DC converter applications.

Introduction

The A4450KESTR-J is a synchronous buck DC-DC converter controller using SRs (also known as synchronous rectification) as the output switching element. This product helps to significantly improve the efficiency of the DC-DC converter thus leading to a reduction in system power consumption as compared to a traditional linear regulator. Additionally, by using SRs, the number of additional power components needed is reduced, and the board space is optimized.

Applications

The A4450KESTR-J is suitable for a wide range of applications. Namely, it is applied to portable computers and other battery-driven systems, LCD monitors and displays, mobile phones, digital still cameras, and audio-visual (AV) systems.

For portable computers and other battery-driven systems, this product helps to reduce power consumption, further extending the battery life. Similarly, for LCD monitors and displays, the low current consumption is ideal for long life image viewing. In the mobile phone market, the A4450KESTR-J provides an effective power management solution, meaning a user can enjoy longer talk times during communication. Additionally, it is also suitable for digital still cameras, helping to reduce power consumption and enhance the photography experience.

Working Principle

By using SRs in a synchronous buck topology, the SRs act as the power switches of the converter. This results in significantly more efficient power conversion since the conduction losses are minimized. Additionally, since the SRs will remain in an always-on state, there is no need for type of voltage-mode compensation. The device is conveniently controlled by the external PWM signal from the microcontroller, which can control both the switching frequency and duty cycle.

Additionally, the A4450KESR-J adopts a high-side pre-driver to ensure low driver loss and high efficiency as well as to provide for stable high-side switching characteristics. Special techniques used in this controller ensure reliable light-load operation and fast load transient responses.

Package

This device is offered in two packages, the WQFN-13L (3mm x 3mm) and USON-6L (2mm x 2mm). Both packages are Lead(Pb)-free and halogen-free.

Conclusion

The A4450KESR-J is a low-side synchronous buck regulator from Renesas which is suitable for medium voltage range DC-DC converter applications. Its SRs minimize conduction losses while the high-side pre-driver ensures low driver loss and high efficiency. Additionally, special techniques guarantee reliable light-load operation and fast load transient responses. It is offered in a Lead（Pb）-free, halogen-free WQFN-13L (3mm x 3mm) and USON-6L (2mm x 2mm) package.

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