What is Undervoltage Lockout (UVLO) Threshold of an eFuse IC?

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Editorial Team - everything PE

Aug 9, 2023

Undervoltage Lockout (UVLO) also known as Brownout Protection is used to prevent erratic behavior and potential damage caused by insufficient supply voltage in eFuse ICs. When the input voltage falls below a certain threshold, the UVLO circuitry disables the eFuse, effectively cutting off the power flow. This ensures that the protected system operates only within a safe voltage range, preventing unexpected shutdowns or damages during low-voltage conditions.

Voltage Characteristics of an eFuse IC

Benefits of UVLO Threshold in eFuse ICs

  • System Reliability: The UVLO feature ensures that electronic systems operate only within their designed voltage range. If the voltage drops below the UVLO threshold, electronic components might malfunction, behave unpredictably, or even sustain damage. By disconnecting the power during such events, eFuse ICs prevent these undesirable scenarios, enhancing the overall system reliability.
  • Battery-Powered Applications: In portable and battery-powered applications, the battery voltage tends to decrease gradually as it discharges. The UVLO threshold in eFuse ICs prevents the system from operating at dangerously low voltages, which could lead to an incomplete or improper operation.
  • Protecting Li-ion Batteries: Lithium-ion batteries are sensitive to over-discharge, which can lead to irreversible damage, reduced capacity, or even safety hazards. The UVLO threshold ensures that the eFuse disconnects the battery from the load before the voltage drops to a critical level, protecting the battery and increasing its lifespan.
  • Transient Voltage Events: Power systems are susceptible to transient voltage events, such as voltage spikes and surges. During such events, the input voltage might momentarily drop below acceptable levels. The UVLO threshold acts as a buffer against these transients, safeguarding the system from any adverse effects.

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