A micro-power LDO with piecewise voltage foldback current limit protection
| Autor: | Liao Xue, Guo Zhongjie, Liu Youbao, Wei Hailong |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Power supply rejection ratio
Materials science Transconductance Foldback (power supply design) Line regulation Condensed Matter Physics Electronic Optical and Magnetic Materials Control theory Load regulation Materials Chemistry Constant current Electrical and Electronic Engineering Electrical impedance Voltage |
| Zdroj: | Journal of Semiconductors. 33:115012 |
| ISSN: | 1674-4926 |
| DOI: | 10.1088/1674-4926/33/11/115012 |
| Popis: | To achieve a constant current limit, low power consumption and high driving capability, a micro-power LDO with a piecewise voltage-foldback current-limit circuit is presented. The current-limit threshold is dynamically adjusted to achieve a maximum driving capability and lower quiescent current of only 300 nA. To increase the loop stability of the proposed LDO, a high impedance transconductance buffer under a micro quiescent current is designed for splitting the pole that exists at the gate of the pass transistor to the dominant pole, and a zero is designed for the purpose of the second pole phase compensation. The proposed LDO is fabricated in a BiCMOS process. The measurement results show that the short-circuit current of the LDO is 190 mA, the constant limit current under a high drop-out voltage is 440 mA, and the maximum load current under a low drop-out voltage is up to 800 mA. In addition, the quiescent current of the LDO is only 7 μA, the load regulation is about 0.56% on full scale, the line regulation is about 0.012%/V, the PSRR at 120 Hz is 58 dB and the drop-out voltage is only 70 mV when the load current is 250 mA. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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