Load switch control circuit with low power consumption

Abstract

The invention discloses a load switch control circuit with low power consumption. The load switch control circuit comprises a signal generation module, a high-frequency oscillation module, a charge pump module, a gate driving module and a load switch; the load switch is an N-channel enhanced MOS tube; the gate driving module is connected with the gate of the MOS tube; the charge pump module is connected with the gate driving module; the high-frequency oscillation module is connected with the charge pump module; the signal generation module generates an extremely low duty ratio signal, and the pulse signal output end of the signal generation module is connected with the high-frequency oscillation module, the charge pump module and the gate drive module. The N-type MOS power tube is adopted as a load switch, the conduction impedance and the chip size in the switch are reduced, meanwhile, the control circuit generates an extremely low duty ratio signal through extremely low current to control a circuit module to work or sleep, and extremely low power consumption of the control circuit is achieved.

Description

technical field [0001] The invention relates to the field of load switch chip design, in particular to a low power consumption load switch control circuit. Background technique [0002] The load switch chip (Load Switch) has been widely used in various electronic systems in the industry, which is conducive to better power supply design and power consumption design of the system, prolonging the standby time of the system, and greatly helping to improve efficiency. With more and more electronic devices powered by lithium batteries, especially some IOT (Internet of Things, Internet of Things) devices, such as bracelets, watches, TWS (True Wireless Stereo, true wireless stereo) earphones, etc., the system for The requirements for battery life and efficiency control are getting higher and higher. [0003] Therefore, higher requirements are placed on the efficiency of the load switch chip, and the efficiency of the chip itself is mainly affected by the on-resistance of the power ...

AI Technical Summary

Problems solved by technology

[0006] In the above prior art, the load switch needs to use two sets of OSC circuits for lower power consumption, which increases the complexity and cost of system design

Since the charge pump is always working, the working current of its drive circuit is still relatively large, and there is no way to achieve a lower working current of the control circuit.

Images