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Cancellation of load regulation in low drop-out regulators

Cancellation of load regulation in low drop-out regulators

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A method for cancelling load regulation, based on level shifting the reference, is proposed. In this architecture, the load current is monitored, sensed, and used to dynamically adapt the effective value of the reference voltage. The proposed architecture reduced a 2.5% load regulation droop to a mere 0.2%, without compromising system stability.

References

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      • F. Goodenough . Low dropout linear regulators. Electron. Des. , 65 - 77
    2. 2)
      • Rincón-Mora, G.A.: `Optimized frequency shaping circuit topologies for LDOs', US, 5,982,226, November 1999.
    3. 3)
      • G.A. Rincón-Mora , P.E. Allen . Optimized frequency shaping circuit topologies for LDOs. IEEE Trans. Circuits Syst II , 6 , 703 - 708
    4. 4)
      • Xi, X.: `PMOS low drop-out voltage regulator using non-inverting variable gain stage', US, 6,246,221, September 2000.
    5. 5)
      • G.A. Rincón-Mora , P.E. Allen . A low voltage, low quiescent current, low drop-out regulator. IEEE J. Solid-State Circuits , 1 , 36 - 44
    6. 6)
      • Rincón-Mora, G.A.: `Low-dropout voltage regulator incorporating a current efficient transient response boost circuit', US, 6,046,577, April 2000.
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      • G.A. Rincón-Mora . (2002) Voltage reference – from diodes to precision high-order bandgap circuits.
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