MIC5389-MGYCS-TR

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

The MIC5389-MGYCS-TR is a dual low-dropout linear regulator manufactured by Micrel, now part of Microchip Technology. It provides two independent outputs with fixed voltages of 2.8V and 1.8V. The device supports a peak output current of 200mA per channel and a continuous current of 150mA. It operates within an input voltage range of 2.5V to 5.5V. The package is a 6-bump wafer level chip scale package (WLCSP) measuring 1.5mm x 1.0mm.

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

• Features an auto-discharge circuit that applies an internal resistive load to the output when disabled to discharge external capacitors.
• Includes independent active-high enable pins for each LDO, allowing individual control and zero off-mode current consumption.
• Provides high output accuracy with ±2% tolerance and maintains stability with small 1µF ceramic output capacitors.

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

• Camera module power supplies
• Portable medical devices
• Mobile phones and camera phones

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

Verify the manufacturer origin as this component was originally produced by Micrel before acquisition by Microchip. Confirm the specific suffix 'M4YCS' or 'MGYCS' matches the required voltage configuration. Ensure the datasheet version aligns with the intended design specifications.

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

Select the MIC5389 variant over the MIC5388 if automatic output capacitor discharge upon shutdown is required. Verify that the application requires the specific 2.8V and 1.8V fixed output combination. Consider the thermal resistance of the WLCSP package for high ambient temperature environments.

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

This component belongs to the MIC5388/9 family of dual LDO regulators designed for portable electronics. These devices are characterized by their miniature footprint and low quiescent current, making them suitable for battery-powered applications where space and efficiency are critical constraints.

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

MIC5388-MGYCS-TR: Identical electrical characteristics but lacks the auto-discharge feature found in the MIC5389 series.

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

What is the function of the auto-discharge circuit in the MIC5389?

When the enable pin is driven low, an internal NFET switches on to provide a typical 30Ω resistive load across the output, actively discharging the external output capacitor.

Can the MIC5389 operate without a load connected?

Yes, the device remains stable and in regulation even under no-load conditions, which is beneficial for CMOS RAM keep-alive applications.