Self-biased power path management drive circuit integrated in charger

Abstract

The invention relates to a self-biased power path management drive circuit integrated in a charger. A floating ground generation module is configured to generate a floating ground signal having a driving capability, a voltage difference between the floating ground signal and a power supply voltage of the drive circuit is determined according to a power supply rail of an enable signal; a self-biasmodule generates current bias of the floating ground generation module by using a first resistor, a first NMOS transistor and a first PMOS transistor, and an extra bias current circuit is not needed;a level shift module is used for lifting a power rail of an enable signal to realize low-voltage control of high voltage, and can be compatible with low-voltage and medium-high voltage applications; alogic module is used for carrying out logic processing on the enable signal after the power rail is lifted by the level shift module to obtain an output signal of the power path management driving circuit, so that the power tube is disconnected when the enable signal is valid, the load is powered by external power supply voltage, and meanwhile, the battery is charged by the charger; when the enable signal is invalid, the power tube is conducted, and the battery supplies power to the load.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design / microelectronic design / electronic circuit, and relates to a drive circuit for power path management (PowerPath). bias current. Background technique [0002] Chargers often integrate power path management (PowerPath) to adapt to normal charging in various situations, such as figure 1 Shown is the charger integrated with the PowerPath channel, where VBUS is the external power supply voltage, and EN is the enable signal. The enable signal EN controls the charge pump (charge pump), DC-DC converter and power path management drive circuit (PowerPath Drive), the output of the charge pump (charge pump) controls the switch tubes NM3 and NM4, and the switch tubes NM3 and NM4 are connected to Between the external power supply voltage VBUS and the load port VSYS; the power path management drive circuit (PowerPath Drive) is used to control the power tube PM0, and the power tube PM0 is conne...

AI Technical Summary

Problems solved by technology

[0005] The drive control of the power transistor PM0 is realized by the power path management drive circuit (PowerPath Drive) according to the enable signal EN. How to generate the power transistor gate drive signal BAT_DRV with drive capability and compatible with low-voltage and medium-high voltage applications is a matter for those skilled in the art. Research focus; In addition, the traditional drive circuit needs an external current bias, so an additional bias current circuit is required, which increases the circuit area and power consumption

Images