Zhirong Technology's power management chip leads the technological wave

In recent years, with the acceleration of domestic substitution, a number of innovative brands have emerged in the field of domestic power management chips to compete with international giants. Zhuhai Zhirong Technology is one of the new stars. Recently, Li Xin, founder and CEO of Zhirong Technology, accepted an exclusive interview with Jiwei.com and talked about the "microclimate" of power management chips.

The conduction control of PMOS tube is relatively simple, and only needs to lower the gate voltage, but it is generally not easy to achieve low internal resistance. Under the comparison of the same internal resistance, the cost of PMOS is higher than that of NMOS. The conduction control of NMOS is relatively complicated, and a boost circuit is required to generate a voltage higher than the output power supply to drive the gate. The boost circuit will introduce interference such as switching noise and EMI radiation, which are unacceptable to some circuit systems. Therefore, the selection of the pass tube is generally considered in combination with internal resistance, cost and circuit performance. At the same time, it is also necessary to consider the flexibility of the pass tube selection when designing the chip.

To this end, Zhirong Technology applied for an invention patent named "Passage Tube Control Circuit, Power Management Chip and Power Supply Device" (application number: 202010856683.6) on August 24, 2020, and the applicant was Zhuhai Zhirong Technology Co., Ltd.

Figure 1 Power management chip circuit block diagram

FIG1 is a circuit block diagram of a power management chip proposed in the present invention. The power management chip includes a path control circuit that can be connected to a path circuit and control the path circuit to be turned on or off.

The channel tube control circuit includes a multiplexing terminal GATE, a logic control circuit 10, a MOS type detection circuit 20, a PMOS driving circuit 30, and an NMOS driving circuit 40. The input end of the MOS type detection circuit is electrically connected to the multiplexing terminal, and the output end is electrically connected to the logic control circuit, which can detect the type of the channel tube electrically connected to the multiplexing terminal and transmit the detection signal to the logic control circuit. The input end of the PMOS driving circuit is electrically connected to the logic control circuit, and the output end is electrically connected to the multiplexing terminal, and the PMOS driving control signal can be sent to it. The input end of the NMOS driving circuit is electrically connected to the logic control circuit, and the output end is electrically connected to the multiplexing terminal, and the NMOS driving control signal can be sent to the multiplexing terminal. The logic control circuit controls the PMOS driving circuit or the NMOS driving circuit to be enabled according to the detection signal.

When the MOS type detection circuit is detecting, the logic control circuit controls the first control switch to be turned on, and the current source pulls down the control end of the passage tube electrically connected to the multiplexing terminal. If the passage tube is a PMOS tube, since there is a pull-up resistor between the source and the gate of the PMOS tube, and the product of the current value of the current source and the resistance value of the pull-up resistor is less than the threshold voltage of the PMOS tube, the voltage of the gate of the PMOS tube will be maintained near the output voltage of the power supply circuit, and the PMOS tube is still in the off state. If the passage tube is an NMOS tube, when the first control switch is turned on, the gate of the NMOS will be pulled down to the ground by the current source. Therefore, the voltage of the multiplexing terminal is compared with the reference voltage through the voltage comparator. If the voltage of the multiplexing terminal is higher than the reference voltage and the detection signal is high, it means that the detection result of the passage tube is PMOS. If the voltage of the multiplexing terminal is lower than the reference voltage, the detection signal is low, it means that the detection result of the passage tube is NMOS, so that the type of the passage tube can be detected.

In short, Zhirong Technology's power management chip patent detects the type of pass tube electrically connected to the multiplexed terminal through a MOS type detection circuit. It is compatible with the control of both PMOS and NMOS pass tubes, making the selection of pass tubes more flexible and convenient during application.

Zhirong Technology is a leading domestic mixed-analog SoC chip design company that has been deeply engaged in analog chips for many years. Zhirong Technology has always adhered to the concept of wisdom, innovation, and integration, and is committed to providing customers with first-class quality and superior experience smart chip products and solutions, and is determined to develop into a top national chip company.