Load dependent discharge of charge pump regulator based on voltage controlled oscillator

By designing a pulse generator circuit including a charge pump, voltage divider, error amplifier and dependent current source circuit, the additional discharge current path is activated, and the problem of long discharge time of voltage pulses in the EEPROM programming cycle is solved, and a faster write speed is achieved.

CN119731945APending Publication Date: 2025-03-28TEXAS INSTRUMENTS INC
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Patent Information

Application Number
CN202380059831.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-08-31
Filing Date
2023-08-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing EEPROM requires a voltage significantly higher than the supply voltage to erase and program during the programming cycle, resulting in a longer discharge time of the voltage pulse, limiting the write speed of the EEPROM.

Method used

A pulse generator circuit is designed, including a charge pump, voltage divider, error amplifier and dependent current source circuit. By activating the additional discharge current path, the discharge current is increased and the discharge time of the EEPROM input capacitor is shortened.

Benefits of technology

By increasing the discharge current, the discharge time of the EEPROM is shortened, allowing for faster write operations, and is suitable for different types of EEPROMs regardless of their input capacitance and discharge current changes.

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Abstract

A pulse generator circuit (210) includes a charge pump (114) having a charge pump output. A voltage divider (R1 / R2) is coupled to the charge pump output. The voltage divider (R1 / R2) has a voltage divider output. An error amplifier (116) has a first error amplifier input and a second error amplifier input. The first error amplifier input is coupled to the voltage divider output. A dependent current source circuit (220) has a first input coupled to the charge pump output, a second input coupled to the voltage divider output, and a third input coupled to the second error amplifier input. The dependent current source circuit (220) is configured to flow a current from the charge pump output that is proportional to a difference between a first voltage at the voltage divider output and a second voltage at the second error amplifier input.
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