The application and integration of the power IC chip is more and more important for electronic devices. In this study, we develop high-voltage buck-boost conversion chip. Based on auto mode switch, this chip can achieve a stable output voltage without the need of detecting input level. The proposed technique can automatically adjust the on-time value using discharged loop to rapidly shorten the transient response time. The system could always maintain steadily the output voltage of 24V as the range of input voltage is widely from 12V to 40V. The output load current is available from 20 ​mA to 1A, and the highest transform efficiency is 86.3%. As the load current is suddenly changed from high to low, the overshoot level can be reduced with a fast discharging loop, and to fasten the transient speed. As for the low-voltage conversion, it outputs 3.3V under the input from 2.5V to 5V, where the maximum efficiency of buck/boost can achieve 94%. The chip is implemented TSMC0.25 ​μm HV- process, and the size of the circuit layout is 2.18 ​mm², where four power MOS had been integrated to the chip for buck-boost control.

功率IC芯片的应用和集成对于电子设备越来越重要。在这项研究中，我们开发了高压降压-升压转换芯片。基于自动模式切换，该芯片无需检测输入电平即可实现稳定的输出电压。所提出的技术可以使用放电回路自动调节导通时间值，以迅速缩短瞬态响应时间。由于输入电压范围从12V到40V，该系统始终可以稳定地保持24V的输出电压。输出负载电流范围为20 mA至1A，最高转换效率为86.3％。当负载电流从高突然变为低时，可以通过快速的放电环路来降低过冲水平，并提高瞬态速度。至于低压转换，它输出3。在2.5V至5V的输入电压下提供3V电压，其中降压/升压的最大效率可达到94％。该芯片实现为TSMC0.25μ米HV-处理，以及电路布局的尺寸为2.18毫米² 4个功率MOS已整合到芯片为降压-升压控制。