The present invention relates to a chip power supply method and a chip, where configuration memory array provides configuration voltage to an NMOS transmission gate, and an LDO circuit supplies power to the chip. The method includes: determining that a working state of the chip switches from a first state to a second state, where the first state and the second state are separately an initial mode, a program mode or a user mode; and adjusting, according to the working state of the chip, a configuration bit to adjust an output voltage of the LDO circuit. The present invention reduces power dissipation of the chip during memory configuration, and improves working performance thereof during the user mode.