AS13985F28-T

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

The AS13985F28-T is a micropower low-dropout linear regulator delivering a fixed 2.8V output at up to 150mA. It operates within a 2.5V to 5.5V input range and maintains stability with ceramic capacitors from 1µF to 22µF. The device features ultra-low dropout voltage, high peak-current capability, and integrated over-temperature and over-current protection. Quiescent current is typically 95µA in active mode and drops below 1µA in shutdown. Output noise can be reduced to 30µV RMS using a bypass capacitor.

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

• Ultra-low dropout voltage ensures efficient regulation even under minimal headroom conditions.
• Integrated thermal and current protection safeguards the device against overload scenarios.
• Low-noise architecture supports direct connection of sensitive circuits without additional filtering.
• Automatic sleep mode significantly reduces power consumption during inactive periods.

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

• Mobile phones
• Personal Digital Assistants (PDAs)
• MP3 players
• Digital cameras

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

Verify that the specific ordering code matches the required package type, as the AS13985 series is available in both 5-bump WLP and 5-pin SOT23 configurations. Confirm the output voltage suffix corresponds to the design requirement. Ensure compatibility with low-ESR ceramic output capacitors for guaranteed stability. Check datasheet limits for absolute maximum ratings before integration.

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

Select this component for battery-powered designs requiring stable voltage regulation with minimal external components. The 2.8V output is suitable for powering logic circuits or RF modules. Consider the WLP package for space-constrained applications or SOT23 for standard surface-mount processes. Verify input voltage remains above the nominal output plus dropout requirements across all operating temperatures.

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

This part belongs to the AS13985 family of micropower LDOs manufactured by austriamicrosystems AG. The series offers multiple fixed output voltages ranging from 1.2V to 5.0V in 25mV steps. All variants share identical electrical characteristics and protection features, differing only in the regulated output voltage level and corresponding package marking codes.

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

Direct substitutes include other AS13985 variants with different output voltages if system architecture allows adjustment. Cross-reference tools may identify equivalent regulators from other manufacturers, but verification of pinout, package dimensions, and electrical parameters against the official datasheet is mandatory.

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

What is the minimum output capacitance required for stability?

The device is guaranteed stable with ceramic output capacitors ranging from 1µF to 22µF.

How does the BYPASS pin affect performance?

Connecting a 10nF capacitor to the BYPASS pin reduces the output noise voltage to 30µV RMS.

What happens when the junction temperature exceeds the limit?

The device enters thermal shutdown when the junction temperature reaches approximately 160°C, protecting the component from damage.