Mobile devices have become an indispensable product in human life and the design of size has also becomes increasingly smaller. However, how to reduce the size and provide enough usage time also brings difficulties for designers in product design. This text will introduce the solution provided by Nexperia and see how they overcome these problems.
The best solution for balancing battery life and functions
One of the smallest mobile devices is the “true” wireless earbud, of which both unilateral headsets also adopt wireless connection without any cable. This kind of wireless earbuds should not have a large size and should be able to conduct wireless audio transmission with an inner battery, which brings great challenges for the design. Except for adopting the smallest boundary dimension in design, the challenge also includes how to make them consume less power, provide better tone quality, as well as the functions of noise-cancellation and biometric monitoring. At the same time of trying to lengthen battery life, the design also needs extra-small and wafer-level chip-scale packaging to assist the manufacturer in conducting design and meeting the demands of consumers.
The design of wireless earbuds needs to balance long battery life and enough functions. Thus the energy efficiency of adopted devices is very important. For this kind of small size wearable device, low power consumption is quite crucial and it requires extra-small packaging or wafer level chip-scale packaging. If you want to have more energy-saving wired recharging function, you can use two back-to-back MOSFETs to replace the inline Schottky diode.
In the reference designing scheme of Nexperia, it adopts a DFN10xx MOSFET that supports 12-20 V for load switches, WLCSP package, DFN2020 for battery FET that supports 2-20 V and P channel, WLCSP package, and DFN0606 for controlling the FET/low current load switches. This kind of small-signal MOSFET was developed by Nexperia with heavy investment, of which the most advanced small signal and power MOSFET solution can provide market-leading technology to ensure the highest reliability and performance, as well as advanced packaging to enhance resistance and thermal performance while reducing the size and cost.
Aiming at antenna electro-static discharge (ESD) protection, it adopts exclusive devices to provide safer circuit antenna protection (NFC and WiFi, etc.). This kind of ESD protection solution is customized for near-field communication (NFC) in mobile devices and can best reduce inter-module distortion and provide excellent clamping performance. In addition, the DSN1608-2 TVS diode used in mobile devices can provide outstanding transient overvoltage protection.
The analog switch adopts the LV/LVC series with low switching losses and low THD, which is appropriate for high quality audio switching. These solutions with a rich set of functions can play the best performance in your system. Being the basic building block of any digital circuit, the control logic adopts an X2SON package solution and uses a Boolean algebra logical solution, which can achieve PCB miniaturization and routing simplification in various kinds of innovative packages. The comprehensive product series of Nexperia includes a withstand voltage input option and open-drain circuit output option in order to achieve interface connection between different voltage nodes.
The Schottky rectifier adopts DSN0603/DSN1006 with the capacity of no less than 200mA. The IF≥1A Schottky diode and rectifier from Nexperia have the space and performance advantages of a DC/DC converter. The PMEG series of Schottky diode and rectifier has a forward current higher than 1A, which is the ideal choice of reversed polarity protection or freewheeling diode for DC/DC converter. They can provide space and performance advantages, of which the package options include a copper clip-bond CFP package according to automotive standards, as well as standard SMD and leadless DFN package.
Smart phones have become the key to our daily life. They link us with “the cloud” and numerous peripheral equipment including smart watches and earbuds or even smart speakers and mixed reality headsets. Except for facing the most challenging limit of footprints, these products are also extremely limited in available space and need to be extremely energy-saving, extremely flexible, and rapid volume product improving capacity. Therefore, how to minimize the space and further increase the efficiency are the key for the success of these products.
At the same time of integrating more functions into smaller package size to reflect industrial requirements, Nexperia also constantly increases the efficiency and the performance like using the same package size to provide different functions and provide flexibility of circuit board layout for designers. If you have any demand for small package devices, please visit the Nexperia New Package Portal Website for more information.