Low dropout voltage regulator providing adaptive compensation

Details Low dropout voltage regulator providing adaptive compensation Low dropout voltage regulator providing adaptive compensation

2006-08-15

2006-08-15

Easthom, Karl (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07091710

ABSTRACT:
A method and apparatus to dynamically modify internal compensation of a low dropout (LDO) voltage regulator is provided. The LDO voltage regulator includes an output pass transistor, an error amplifier, a bias transistor and a compensation network. The compensation network is connected between a gate and a drain of the output pass transistor to compensate for the feedback loop. The compensation network and the bias transistor generate pole-zero pairs to perform a maximum 45 degrees phase shift before reaching the crossover frequency in the LDO voltage regulator. Therefore a minimum 45 degrees phase margin is provided for the feedback loop in various load conditions. Furthermore, the pole-zero pairs produced in the LDO voltage regulator are adaptively adjusted according to load conditions, so that the bandwidth is optimized and faster transient response is achieved.

REFERENCES:
patent: 6300749 (2001-10-01), Castelli et al.
patent: 6975099 (2005-12-01), Wu et al.
patent: 2003/0218450 (2003-11-01), Bonte

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