Patent ID: 7915873

Claim:
A mode control method used for a switching regulator, comprising: receiving an input signal; amplifying said input signal to get an amplified signal; sampling said amplified signal to get a sampled signal; averaging said sampled signal to get an averaged sensed output signal; comparing said averaged sensed output signal with a first pre-determined threshold or a second pre-determined threshold, wherein the comparing generates a PWM enable signal which is used to determine the mode, and when said averaged sensed output signal is lower than said first pre-determined threshold, said PWM enable signal is low, and when said averaged sensed output signal is higher than said second pre-determined threshold, said PWM enable signal is high, further wherein when said PWM enable signal is low, said switching regulator enters constant-peak-current PFM mode; when said PWM enable signal is high, said switching regulator enters PWM mode.