Packaging Innovation Enables Power Efficiency for Wearables

　　對于可穿戴設備，小尺寸是組件選擇的一個重要因素，包括那些用于電源。直流/直流轉(zhuǎn)換器的出現(xiàn)，都可以提供高轉(zhuǎn)換效率，同時最大限度地減少電路板空間整合轉(zhuǎn)換控制器及關(guān)鍵無源器件到系統(tǒng)封裝模塊，有助于減少尺寸和簡化的布局。本文著眼于包裝一體化有助于降低開關(guān)的服飾和設計方面的考慮在處理這些設備器尺寸的方法。

　　可穿戴設備的設計提出了一些挑戰(zhàn)，但其中一個關(guān)鍵因素是電源效率，不僅在能源方面，但規(guī)模。這些器件磨損了很長一段時間，所以他們需要良好的電池自主性。他們接近皮膚也需要高效率的轉(zhuǎn)換器，可以通過開關(guān)電源提供的東西，而不是傳統(tǒng)的低壓差穩(wěn)壓器，已在過去的緊湊性青睞。然而，開關(guān)模式的設計更復雜。

　　Although CMOS integration has allowed the scaling down of active components that include on-chip power transistors， traditional DC/DC converter designs assume the use of external passive components. These individual devices may not consume much volume on their own， but when used in combination to support the operation of the converter， require significant board space compared to the primary SoC.

　　Larger portable designs have been able to tolerate the board space required by the power circuitry. However， wearables by nature of their smaller size and demand for as much battery volume as possible for maximum time between charges put intense pressure on the other components in the system in terms of space.