一种面向高压DCDC转换器的片内LDO设计

doi:10.16257/j.cnki.1681-1070.2026.0104

摘要/Abstract

摘要： 针对高压DCDC转换器的应用需求，设计了一种可切换供电电源的片内LDO电路。设计的LDO电路架构由带隙基准电路与LDO电路2部分组成。采用带隙基准电路产生一个与温度无关的基准电压，基准电压输送到LDO中为DCDC转换器产生一个稳定的内部电源。带隙基准电路采用大电阻降压，可有效降低电路功耗。LDO电路设计了供电电源切换电路，能够根据外部电压切换供电电源，从而有效提高LDO电路的效率。仿真结果表明，在5~65 V的输入电压范围内，LDO的输出为3.4 V。在-40~125 ℃的温度范围内，LDO的温度系数为10.71×10^-6℃^-1。LDO的增益为69.25 dB，相位裕度为85.64°。采用供电电源切换电路提高电路性能，由输入电压供电时，线性调整率为71.85 μV·V^-1，功耗为14.76 μW；由外接电源供电时，线性调整率为44.94 μV·V^-1，功耗为16.85 μW。

关键词: LDO, DCDC转换器, 带隙基准电路, 电源切换

Abstract: In response to the application requirements of high-voltage DCDC converters, an on-chip LDO circuit with a switchable power supply has been designed. The designed LDO circuit architecture consists of two parts: a bandgap reference circuit and an LDO circuit. The bandgap reference circuit is used to generate a temperature-independent reference voltage, which is fed into the LDO to produce a stable internal power supply for the DCDC converter. The bandgap reference circuit employs a large resistor for voltage reduction, effectively reducing the power consumption of the circuit. The LDO circuit is designed with a power supply switching circuit, which can switch the power supply according to the external voltage, effectively improving the efficiency of the LDO circuit. The simulation results indicate that the output of the LDO is 3.4 V within the input voltage range of 5-65 V. Within the temperature range of -40 ℃ to 125 ℃, the temperature coefficient of the LDO is 10.71×10^-6 ℃^-1. The gain of the LDO is 69.25 dB, and the phase margin is 85.64°. The performance of the circuit is improved by employing the power supply switching circuit. When powered by the input voltage, the line regulation is 71.85 μV·V^-1, and the power consumption is 14.76 μW. When powered by an external power supply, the line regulation is 44.94 μV·V^-1, and the power consumption is 16.85 μW.

Key words: LDO, DCDC converter, bandgap reference circuit, power switching

中图分类号:

TN624

蔡明格. 一种面向高压DCDC转换器的片内LDO设计[J]. 电子与封装, 2026, 26(9): 090301 .

CAI Mingge. Design of an on-Chip LDO for High-Voltage DCDC Converters[J]. Electronics & Packaging, 2026, 26(9): 090301 .

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