MIC5309-1.2YMT-TR

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

The MIC5309-1.2YMT-TR is a fixed-output linear low-dropout regulator manufactured by Microchip Technology, providing a stable 1.2V output with a maximum current of 300mA. It operates within an input voltage range of 1.7V to 5.5V and features an ultra-low ground current of typically 23µA under full load. The device incorporates thermal shutdown and current limit protection, ensuring reliable operation across a temperature range of -40°C to +125°C. It utilizes a 6-pin Thin MLF® package measuring 1.6mm x 1.6mm.

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

• Ultra-low dropout voltage of 100mV typical at 300mA load
• High power supply rejection ratio up to 90dB at 1kHz
• Zero-off-mode current state when disabled via the enable pin
• Stable with small 1µF ceramic output capacitors

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

• Mobile Phones
• PDAs
• GPS Receivers
• Portable Electronics

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

Verify that the component matches the exact part number MIC5309-1.2YMT-TR from Microchip Technology or its authorized predecessor Micrel. Confirm the package type is the 6-pin 1.6mm x 1.6mm Thin MLF®. Ensure the operating temperature range meets the requirement of -40°C to +125°C. Check for RoHS compliance status as indicated in the manufacturer documentation.

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

Select this regulator for applications requiring fast transient response and minimal quiescent current consumption. It is suitable for battery-operated devices where maintaining efficiency at low input voltages is critical. The device supports a bias supply voltage range of 2.5V to 5.5V, allowing flexibility in system design. Ensure adequate thermal management is considered for continuous 300mA loads.

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

The MIC5309 belongs to the µCap family of low dropout regulators designed for space-constrained portable electronics. Originally developed by Micrel, Inc., the product line was integrated into Microchip Technology's portfolio following acquisition. The series emphasizes high performance in a tiny footprint, catering to modern mobile and handheld device requirements.

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

MIC5309-1.8YMT-TR (Fixed 1.8V Output)

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

What is the minimum required output capacitance for stability?

The MIC5309 requires a minimum output capacitor of 1µF to maintain stability, optimized for use with low-ESR ceramic chip capacitors.

How does the device behave when the Enable pin is pulled low?

Forcing the Enable pin low disables the regulator and places it into a zero-off-mode current state, drawing virtually no current.