Programmable LDO Regulator Digital Trimming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional low-dropout (LDO) regulators lack user-mode digital programmability, limiting their adaptability to various applications and end-user needs, as they often rely on one-time programmable methods like laser trimming or metal wire fuses, which do not account for the wide range of operating conditions.
Innovation Solution
A programmable LDO regulator with a digital trimming mechanism using a binary control sequence stored in a non-volatile register, allowing for multiple adjustments of output voltage levels and impedance settings through a serial interface, enabling flexible configuration of voltage reference, error amplifier, and feedback circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If one-time programmable methods like laser trimming or metal wire fuses are used, then manufacturing precision is improved, but device complexity and adaptability worsen
Solution Approach 1:
The patent implements a digital trimming mechanism that allows the LDO regulator to be programmed multiple times dynamically. A binary control sequence stored in a non-volatile register controls switching elements (such as MOSFETs or resistors) to adjust the output voltage level and impedance settings. This dynamic reconfigurability enables the device to adapt to different applications and operating conditions while maintaining precise voltage control through digital means.
2Adaptability or versatility
If digital trimming mechanism with non-volatile register is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The control circuit serves multiple functions: it stores the binary control sequence in a non-volatile register, decodes the digital trimming code, controls the switching elements for voltage adjustment, and interfaces with external systems through a serial interface. By consolidating these diverse functions into a single control circuit block, the patent minimizes overall device complexity while achieving high adaptability and programmability.
Solution Approach 2:
The patent replaces physical one-time programmable methods (laser trimming, metal wire fuses) with a digital control system. Instead of mechanical or physical modification during manufacturing, the output voltage and impedance are adjusted through digital codes stored in non-volatile memory, which control electronic switching elements. This substitution simplifies the manufacturing process and enables multiple reconfigurations.
3Device complexity
If conventional LDO regulators are used, then device complexity is reduced, but adaptability to various applications worsens
Solution Approach 1:
The patent enables dynamic change of key electrical parameters including output voltage level, feedback impedance, and reference voltage through digital control. The binary control sequence adjusts the impedance of feedback circuits and the reference voltage level, allowing the LDO regulator to be configured for different output voltages and operating conditions. This parameter variability expands the application range while maintaining a relatively simple base circuit architecture.
Data Source
AI summary
A low-dropout (LDO) regulator includes a voltage reference circuit to provide a reference voltage, a pass device including an input terminal coupled to a voltage input, an output terminal to provide an output voltage and a control terminal, and an error amplifier including a first amplifier input for receiving the reference voltage, a second amplifier input, an amplifier output coupled to the control terminal of the pass device. Additionally, the LDO regulator includes a feedback circuit including a feedback input coupled to the output terminal of the pass device and a feedback output coupled to the second amplifier input to provide a feedback signal. The LDO regulator further includes a control circuit including a non-volatile memory to store configuration data to control operation of the voltage reference circuit, the pass device, the error amplifier, and the feedback circuit to produce the output voltage.