Power supply management chip for controlling two-phase Buck circuit having current equalization function based on COT

Abstract

The invention discloses a power supply management chip for controlling a two-phase Buck circuit having a current equalization function based on COT. The power supply management chip is provided with a power supply input pin, an output voltage pin, a grounding pin and two switch SW pins. The chip is internally provided with a reference circuit module, a comparator module, a voltage ring module, a clock generation module, a control logic and soft start module, a constant conduction time generation module, a ripple compensation module, a current sampling module, a current equalization module, a driving module and four in-chip switching tubes. According to the power supply management chip, multiple asymmetric factors can be effectively overcome to realize current equalization so that the precision is high, the power supply management chip can work under high switching frequency, and energy loss is less and area occupation is smaller in comparison with the conventional method of digital control matching duty ratio.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a power management chip for controlling a two-phase Buck circuit with a current sharing function based on a COT. Background technique [0002] The power management chip is a chip that manages the power consumption of each module in the system, and some power management chips will be used for switching power supply circuits. A switching power supply circuit is broadly defined as a circuit that uses a semiconductor power device as a switch to change the power supply form into another form, and automatically controls the closed-loop stable output and has a protection link during the change. A switching power supply circuit generally includes a control chip and peripheral circuits. The common topologies of switching power supply circuits are: buck chopper (Buck), boost chopper (Boost), flyback, forward, half bridge and full bridge. The control methods of the...

AI Technical Summary

Problems solved by technology

However, digital control inevitably introduces quantization errors, leading to undesirable limit cycles; moreover, high-precision DC converters operating at very high switching frequencies require high-resolution and high-speed digital PWM generators and analog-to-digital converters , which in turn leads to energy loss and area waste

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