Peak current control circuit, booster circuit and LED driver

The utility model provides a peak current control circuit, a booster circuit and an LED driver, which are adaptable to the field of integrated circuits. The peak current control circuit includes a current source, a first switch, a second switch, an energy storage element and a comparator; one end of the first switch is connected with input voltage through the current source; the other end of the first switch is grounded through the energy storage element and the second switch; the other end of the first switch is also connected to a non-inverting input end of the comparator; an inverting input end of the comparator is grounded through reference voltage; and an output end of the comparator outputs voltage control signals. The peak current control circuit without a sensing resistor can detect peak current flowing through a power tube, reduce loss and simultaneously increase the efficiency of the booster circuit.