Gate driver for a low dropout voltage regulator
AssigneeNXP B.V.
InventorJean-Robert Tourret
Life of this patent
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Abstract
A low drop-out (LDO) regulator, includes an NMOS transistor having one of a source and drain terminal configured to be coupled to a voltage supply and the other of the source and drain terminal coupled to the low drop out voltage regulator output. A gate driver for the LDO regulator includes a boost converter having a boost converter input configured to be coupled to a boost converter reference voltage, a boost converter output configured to output a boosted voltage greater than the boost converter reference voltage and the voltage supply; and a boost converter clock input configured to receive a clock signal. The gate driver further includes a notch filter having a notch filter input coupled to the boost converter output and a notch filter output coupled to the gate driver output.
Claims20
A gate driver for a low drop-out (LDO) regulator, the LDO regulator including an NMOS transistor having one of a source and drain terminal configured to be coupled to a voltage supply and the other of the source and drain terminal coupled to the LDO regulator output, the gate driver comprising:
- a boost converter comprising:
- a boost converter input configured to be coupled to a boost converter reference voltage;
- a boost converter output configured to output a boosted voltage greater than the boost converter reference voltage and the voltage supply;
- a boost converter clock input configured to receive a clock signal;
- the gate driver further comprising:
- a notch filter having a notch filter input coupled to the boost converter output and a notch filter output coupled to an output of the gate driver.
The power management system of 10 further comprising at least one further LDO regulator coupled to the gate driver, wherein the at least one further regulator is configured to be coupled to a voltage supply in a different voltage domain than the LDO regulator.
A method of driving a gate of an output stage NMOS transistor included in a low dropout (LDO) regulator having one of a source and drain terminal configured to be coupled to a voltage supply and the other of the source and drain terminal coupled to an LDO regulator output, the method comprising:
- boosting a boost converter reference voltage;
- notch filtering the boosted reference voltage;
- and
- providing the filtered boosted reference voltage to the LDO regulator to drive the gate of the NMOS transistor;
- wherein the filtered boosted reference voltage is greater than the voltage of the voltage supply.
Dependencies are inferred from the claim text.