AS13985H33-T

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

The AS13985H33-T is a micropower low-dropout linear regulator delivering 150mA output current with a fixed 3.3V nominal voltage. It operates within a supply range of 2.5V to 5.5V and maintains an output accuracy of ±1%. The device guarantees stability with ceramic output capacitors ranging from 1µF to 22µF. Key electrical parameters include a typical dropout voltage of 45mV at full load, a quiescent current of 95µA in active mode, and a shutdown current of ≤1µA. Integrated protections cover over-temperature and short-circuit conditions.

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

• Ultra-low dropout voltage performance ensures efficient regulation under minimal input-output differentials.
• Integrated bypass pin allows noise reduction to 30µV RMS for sensitive analog circuits.
• Automatic sleep mode significantly reduces power consumption when the enable pin is deactivated.
• Stable operation guaranteed with standard low-ESR ceramic output capacitors.

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

• Mobile phones
• Personal Digital Assistants (PDAs)
• MP3 players
• Handheld computers

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

Verify the specific suffix 'H' confirms the 5-pin SOT23 package variant rather than the WLP option. Confirm the 'T' suffix indicates tape and reel delivery format. Ensure the marking code matches ASK0 for the 3.3V version. Check RoHS compliance status as required by your manufacturing standards.

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

Select this component for battery-powered designs requiring high efficiency and low noise. The 3.3V fixed output suits logic levels and RF modules. Verify that the application load does not exceed 150mA. Ensure the input voltage remains above 2.5V and below 5.5V. Consider thermal dissipation if operating near maximum junction temperatures.

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

This part belongs to the AS13985 series of micropower LDOs designed for mobile and handheld devices. The series offers multiple fixed output voltages from 1.2V to 5.0V. Variants are available in both 5-bump WLP and 5-pin SOT23 packages. The family emphasizes low quiescent current and small footprint for portable electronics.

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

AS13985F33-T serves as the equivalent 3.3V regulator but utilizes a 5-bump WLP package instead of SOT23. Other AS13985 variants provide different fixed output voltages while maintaining identical electrical characteristics and protection features.

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

What is the recommended output capacitor range for stability?

The device is stable with ceramic output capacitors between 1µF and 22µF.

How is the low-noise feature implemented?

A 10nF bypass capacitor connected to the BYPASS pin reduces output noise to 30µV RMS.

What happens during an over-temperature event?

The regulator enters thermal shutdown when the junction temperature reaches approximately 160°C.