LATCH-UP MITIGATED CHARGE PUMP FOR HIGH POWER SUPPLY REJECTION LOW-DROPOUT REGULATOR
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United States of America Patent
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Issued Date -
Oct 17, 2024
app pub date -
Apr 12, 2023
filing date -
Apr 12, 2023
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Abstract
A charge-pump based low dropout (LDO) regulator is provided that overcomes latch-up issues. The LDO regulator is a high PSR low noise LDO regulator that uses a latch-up mitigated charge-pump voltage doubler which includes a N-type metal-oxide-semiconductor field-effect transistor (MOSFET), NMOS, pass transistor. This LDO regulator architecture may be used to provide a very low-noise supply regulated output voltage with high power supply rejection for an on-chip low jitter oscillator. Latch-up is mitigated using control circuitry and a power supply timing sequence. This scheme ensures that parasitic diodes associated with various transistors in the regulator are not forward biased.
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