SEMICONDUCTOR INTEGRATED CIRCUITS

A 1.8 V LDO voltage regulator with foldback current limit and thermal protection

Liu Zhiming, Fu Zhongqian, Huang Lu and Xi Tianzuo

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Abstract: This paper introduces the design of a l.8 V low dropout voltage regulator (LDO) and a foldback current limit circuit which limits the output current to 3 mA when load over-current occurs. The LDO was implemented in a 0.18 µm CMOS technology. The measured result reveals that the LDO0s power supply rejection (PSR) is about −58 dB and –54 dB at 20 Hz and 1 kHz respectively, the response time is 4 µs and the quiescent current is 20 µA. The designed LDO regulator can work with a supply voltage down to 2.0 V with a drop-out voltage of 200 mV at a maximum load current of 240 mA.

Key words: LDO; bandgap; current limit; thermal protecting; error amplifier

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    Received: 18 August 2015 Revised: 06 March 2009 Online: Published: 01 August 2009

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      Liu Zhiming, Fu Zhongqian, Huang Lu, Xi Tianzuo. A 1.8 V LDO voltage regulator with foldback current limit and thermal protection[J]. Journal of Semiconductors, 2009, 30(8): 085007. doi: 10.1088/1674-4926/30/8/085007 Liu Z M, Fu Z Q, Huang L, Xi T Z. A 1.8 V LDO voltage regulator with foldback current limit and thermal protection[J]. J. Semicond., 2009, 30(8): 085007. doi:  10.1088/1674-4926/30/8/085007.Export: BibTex EndNote
      Citation:
      Liu Zhiming, Fu Zhongqian, Huang Lu, Xi Tianzuo. A 1.8 V LDO voltage regulator with foldback current limit and thermal protection[J]. Journal of Semiconductors, 2009, 30(8): 085007. doi: 10.1088/1674-4926/30/8/085007

      Liu Z M, Fu Z Q, Huang L, Xi T Z. A 1.8 V LDO voltage regulator with foldback current limit and thermal protection[J]. J. Semicond., 2009, 30(8): 085007. doi:  10.1088/1674-4926/30/8/085007.
      Export: BibTex EndNote

      A 1.8 V LDO voltage regulator with foldback current limit and thermal protection

      doi: 10.1088/1674-4926/30/8/085007
      • Received Date: 2015-08-18
      • Accepted Date: 2008-09-26
      • Revised Date: 2009-03-06
      • Published Date: 2009-07-31

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