在电源转换器中，较长的软启动时间以及系统环路补偿通常需要依靠较大的片外电容。然而，片外电容不仅会增加芯片封装成本，还会使得芯片外围环境更为复杂，降低系统的可靠性。因此，电容片上集成是必然的选择。但是，片上电容的集成度通常受到工艺条件与芯片面积的严格限制，导致芯片内部补偿网络的设计灵活性受到制约，同时也限制了软启动时间的调节范围。针对上述问题，本文提出一种片外环境简化的高集成度DC-DC转换器方案。在所提出的转换器方案中，针对片内环路补偿电容的集成问题，通过跨导放大器，提出改进型内部补偿方案，实现电容的等效放大，从而优化环路补偿，改善系统的稳定性，使得系统补偿设计更灵活。针对片内软启动电容的集成问题，通过对电容充电电流分流，提出了无片外电容的软启动方案，在有限的电容面积下实现更长的软启动时间，从而有效抑制软启动过程中的浪涌电流。所提出方案基于0.18 µm BCD工艺实现，芯片面积约为1.73 mm²。测试结果表明：在5V/2A输出规格下，1 mA至2 A负载范围内效率均大于80%，峰值效率达到95.1%；负载阶跃变化时，输出电压上下冲小于180 mV，恢复时间约为200 μs，转换器具有良好的稳定性；转换器的启动时间约为4.8 ms。

In power converters, extended soft-start duration and loop compensation typically require large capacitors. However, off-chip capacitors increase packaging cost and peripheral complexity, reducing system reliability. Although on-chip integration is viable, capacitance density is strictly limited by process constraints and chip area, thereby restricting compensation network flexibility and soft-start time adjustment. To address these limitations, a highly integrated DC-DC converter with a simplified off-chip environment is proposed. For internal loop compensation, an improved scheme employing a transconductance amplifier achieves equivalent capacitance amplification, enhancing stability and design flexibility. For on-chip soft-start, a capacitor-free method utilizing charging current diversion is presented, enabling prolonged soft-start time within a limited area to suppress inrush current effectively. The converter is implemented in a 0.18-µm BCD process with an area of 1.73 mm². Measurement results demonstrate that, at a 5 V/2 A output rating, the converter achieves an efficiency exceeding 80% over a load range of 1 mA to 2 A, with a peak efficiency of 95.1%. Under a load step change, the output voltage overshoot and undershoot are less than 180 mV, and the recovery time is approximately 200 μs, indicating good stability of the converter. The measured start up time is approximately 4.8 ms.