DC-DC Converter ESD Protection With Switchable Pull-Up and Pull-Down
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Solution Overview
Problem
Integrated circuits and microelectronic devices are increasingly susceptible to damage from electrostatic discharge (ESD) due to their smaller sizes and higher sensitivity, which can lead to malfunction or damage, especially as they become more densely packed and operate at lower supply voltages.
Innovation Solution
The implementation of a circuit architecture that includes a protection circuit with pull-up and pull-down circuitry, which can deterministically switch to active or inactive states during ESD events to prevent excessive voltage drops and provide a conductive path for ESD currents, thereby mitigating damage and enabling the use of low-voltage transistors in DC-DC voltage converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistor size is reduced to increase circuit density, then device density and integration are improved, but susceptibility to ESD damage increases
Solution Approach 1:
The protection circuit is segmented into multiple functional blocks including detection circuitry, control circuitry, and switchable protection elements distributed across different parts of the IC. This segmentation allows localized protection responses to ESD events while maintaining high-density transistor design elsewhere in the circuit.
Solution Approach 2:
The detection circuitry continuously monitors for ESD events before they can damage sensitive transistors. Control circuitry is pre-configured to rapidly activate protection mechanisms upon detection, preventing ESD damage before it occurs to the high-density transistor structures.
2Use of energy by moving object
If supply voltage is reduced to enable low-voltage operation, then power consumption is improved, but sensitivity to ESD damage increases
Solution Approach 1:
The protection circuit acts as an intermediary between the low-voltage operating circuitry and external ESD threats. Protection elements are strategically positioned to intercept ESD currents before they reach sensitive low-voltage transistors, enabling safe low-voltage operation.
Solution Approach 2:
Protection mechanisms are pre-positioned and pre-configured to cushion against ESD impacts before they reach vulnerable low-voltage circuitry. The control circuitry maintains readiness to activate protection elements, providing a cushioning effect that enables low-voltage operation without ESD vulnerability.
3Reliability
If protection circuitry is added to mitigate ESD damage, then reliability is improved, but device complexity increases
Solution Approach 1:
Multiple protection functions are merged into integrated protection blocks that combine detection, control, and switching elements. This merging reduces the overall number of discrete components needed while maintaining comprehensive ESD protection across the IC.
Solution Approach 2:
The protection circuitry is designed with universal elements that can protect multiple different circuit configurations and voltage levels using the same basic protection architecture. This multi-functionality reduces complexity by avoiding the need for separate dedicated protection circuits for each sensitive element.
4Reliability
If switchable protection elements are implemented, then ESD current diversion is improved, but manufacturing complexity increases
Solution Approach 1:
Switchable protection elements utilize standard semiconductor fabrication parameters and processes that can be integrated into existing manufacturing lines. The protection elements are designed to be fabricated using conventional CMOS or bipolar processes, minimizing additional manufacturing complexity while enabling effective ESD current diversion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the risk of damage from ESD events by managing voltage drops and enabling efficient area usage and cost-effective design in electronic devices, such as mobile and stationary devices, by automatically transitioning to modes that prevent circuit damage during ESD occurrences.
Implementation Method 1
Electrostatic discharge (ESD) refers to the phenomenon of electrical discharge of high current for a short time duration resulting from a buildup of static charge
Implementation Method 2
an RC circuit of the IC is to automatically transition the IC from the first mode
Data Source
AI summary
Techniques and mechanisms for a DC-DC voltage converter to mitigate a risk of damage to circuitry due to electrostatic discharge (ESD). In an embodiment, a protection circuit of the DC-DC voltage converter comprises a pull-up circuit and a pull-down circuit which are coupled in series between a first interconnect and a second interconnect, which are to receive a first supply voltage and a second supply voltage, respectively. A voltage divider comprises capacitors which are coupled in series with each other between the first interconnect and the second interconnect. Control circuitry is coupled with the voltage divider, and is further coupled to automatically configure a first operational mode based on an ESD event. During the first mode, the pull-up circuit is disabled and the pull-down circuit is enabled. In another embodiment, a resistor-capacitor (RC) circuit automatically transitions the protection circuit from the first mode.