We propose a 5/12 ​V dual output DC-DC converter that can achieve high efficiency and a small size form factor. Using low temperature co-fired ceramic (LTCC)-based multi-layer circuits, the converter minimizes power losses caused by power and ground metal planes and reduces the size. The lateral dimension of the converter with nine LTCC layers was 35 ​mm ​× ​45 ​mm. The proposed converter was compatible with the outputs of typical electric bike batteries, which are 48 ​V and 36 ​V. At a full-load condition of 3.1 ​A ​at 5 ​V output and 2 ​A ​at 12 ​V output, the measured efficiency was 92.9% and 93.6% with a supply voltage of 48 ​V and 36 ​V, respectively. The measured line regulation with ±20% of an input voltage was lower than 0.75% and load regulation with a 10%–100% load change for the dual output was lower than 1.4%. Under the condition of 100% load for one output and 25%–100% load change for another output, the maximum cross-regulation was 1.7%. The dynamic load regulation and response was lower than 9.6% and 480 μs with 0%–100% load change, respectively, and the maximum ripple and noise was 33.2 mV_pp. Reliability tests indicated that the average efficiency degradation rate was less than 0.002%/°C. The results of an electromagnetic interference (EMI) test indicated the converter satisfies the IEC61000-6-3 class B standard. The results show that the LTCC multilayer circuit substrate is suitable for a high-efficiency, high-density, high-output stability, and high-reliability in a power converter.

我们提出了一种5/12 V双输出DC-DC转换器，该转换器可实现高效率和小尺寸。使用基于低温共烧陶瓷（LTCC）的多层电路，该转换器可最大程度地减少由电源和接地金属层引起的功耗，并减小尺寸。具有9个LTCC层的转换器的横向尺寸为35毫米×45毫米。拟议的转换器与典型的电动自行车电池的输出兼容，分别为48 V和36 V. 在5 V输出为3.1 A且12 V输出为2 A的满载条件下，在电源电压为48 V和36 V的情况下，测得的效率分别为92.9％和93.6％ 。在±20％的输入电压下测得的线路稳定度低于0.75％，而双路输出的负载变化在10％–100％之间的负载稳定度低于1.4％。在一个输出为100％负载而另一输出为25％–100％负载变化的条件下，最大交叉调节为1.7％。当负载变化为0％–100％时，动态负载调节和响应分别低于9.6％和480μs，最大纹波和噪声为33.2 mV_pp。可靠性测试表明，平均效率下降率小于0.002％/°C。电磁干扰（EMI）测试结果表明该转换器满足IEC61000-6-3 B类标准。结果表明，LTCC多层电路基板适用于功率转换器中的高效率，高密度，高输出稳定性和高可靠性。