The invention discloses a DC-
DC control circuit with wide range of load current, which comprises a P-type power tube (MP), a sampling circuit tube (MPs) of the P-type power tube, a current sense
resistor (Rsense), an N-type power tube (MN), an
inductance (L), a load (RL), a load
capacitance (CL), divider resistances R1 and R2, an
error amplifier (ea), a detection circuit (ea sensor) of the
error amplifier, a first
comparator (comp), a resistance R3, an RS trigger, buffer circuits (buffer 1 and buffer 2) a current conversion circuit (current convertor), a
voltage and current conversion circuit (V-I convertor), a summation arithmetic unit and a current detection
amplifier amp, wherein the resistance R3 is used for converting current into
voltage. The DC-
DC control circuit overcomes the defect of the traditional
control circuit and greatly widening the range of the load current.