A high precision low dropout regulator with nested feedback loops

  • Authors:

  • Chua-Chin Wang;Ron-Chi Kuo;Tung-Han Tsai

  • Affiliations:

  • National Sun Yat-Sen University, Department of Electrical Engineering, 70 Lian-Hai Rd., Kaohsiung, Taiwan;National Sun Yat-Sen University, Department of Electrical Engineering, 70 Lian-Hai Rd., Kaohsiung, Taiwan;National Sun Yat-Sen University, Department of Electrical Engineering, 70 Lian-Hai Rd., Kaohsiung, Taiwan

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2011

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Abstract

A high precision low dropout regulator (LDO) with nested feedback loops is proposed in this paper. By nesting a zero-tracking compensation loop inside of the negative feedback loop comprising an error amplifier, the independence of off-chip capacitor and effective series resistance (ESR) is ensured for different load currents and operating voltages. This circuit is designed and fabricated using a 0.35@mm standard CMOS process. The die area is a 1350@mmx560@mm. The measurement results show that the total error of the output voltage caused by line and load variations is less than +/-3% in low quiescent current (Iddq) or low voltage scenarios. Besides, the smallest dropout of the LDO, 0.11V, while the output current is 165mA, the output load is 4.7@mF and 20 in parallel.