MIC5504-3.3YMT-TZ

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The MIC5504-3.3YMT-TZ is a single-output low-dropout (LDO) voltage regulator manufactured by Microchip Technology, featuring a fixed 3.3V output and a guaranteed 300mA load current capability. It operates within an input voltage range of 2.5V to 5.5V and maintains high accuracy with ±2% initial tolerance at 25°C. The device incorporates an internal enable pull-down resistor and an auto-discharge circuit for safe shutdown states. Key electrical parameters include a typical quiescent current of 38μA, a dropout voltage of 160mV at full load, and a ripple rejection ratio of 60dB at 1kHz. It utilizes a 4-lead 1mm x 1mm Thin DFN package and supports operation from -40°C to +125°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Includes an internal enable pull-down resistor that automatically disables the output when the control signal is floating or tri-stated.
• Features an auto-discharge circuit that activates an internal load to rapidly discharge external capacitors upon shutdown.
• Provides linear current limiting and thermal-shutdown protection to ensure reliability under fault conditions.
• Maintains stability with small-value ceramic output capacitors, optimizing space efficiency in compact designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Smartphones
• Portable electronics such as PDAs and GPS devices
• Digital still cameras (DSC)
• Medical devices
• 5V powered systems

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'TZ' corresponds to the required tape and reel quantity of 10,000 units per reel, distinct from other packaging options like T5 or TR. Confirm the component meets RoHS compliance standards and matches the 4-lead TDFN footprint dimensions for PCB integration. Ensure the ordering part number aligns with the manufacturer's current product identification system to avoid discrepancies in lead time or availability status.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator for applications requiring a fixed 3.3V rail with up to 300mA continuous current draw. The internal enable pull-down feature makes it suitable for processor-controlled power sequences where the enable pin may remain unconnected during boot-up. Consider the 160mV dropout voltage for battery-powered designs to maximize energy efficiency. Verify that the operating junction temperature range of -40°C to +125°C meets the environmental requirements of the target application.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the MIC550x family of general-purpose LDO regulators designed for portable devices. The MIC5504 variant specifically combines both auto-discharge functionality and an internal enable pull-down resistor, distinguishing it from the MIC5501, MIC5502, and MIC5503 models. The family offers various fixed output voltages and package options to support diverse design constraints while maintaining consistent performance characteristics across the series.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes within the same family include MIC5504-3.3YMT-T5 and MIC5504-3.3YMT-TR, which share identical electrical specifications but differ in tape and reel packaging quantities. Other variants such as MIC5504-3.3YM5-TZ offer the same functionality in a 5-lead SOT23 package instead of the 4-lead TDFN form factor.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What happens to the output voltage when the enable pin is left floating?

The MIC5504 includes an internal pull-down resistor on the enable pin. If the pin is left floating, the regulator interprets this as a logic-low state, disabling the output and activating the auto-discharge circuit to drain any charge from the output capacitor.

Is the MIC5504 suitable for use in RF transmitter systems?

No, the datasheet explicitly states that the MIC5501/2/3/4 family is not suitable for RF transmitter systems due to potential noise or stability issues in those specific high-frequency environments.

How does the auto-discharge feature function during shutdown?

When the enable pin is forced low, the MIC5504 switches an internal 25Ω load onto the output node. This actively discharges external capacitors connected to the output, ensuring the voltage drops rapidly rather than remaining held by leakage currents.