AS13985F33-T

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

The AS13985F33-T is a micropower low-dropout (LDO) voltage regulator delivering a fixed 3.3V output at up to 150mA. It operates within an input supply range of 2.5V to 5.5V and maintains 1% output voltage accuracy across temperatures from -40°C to +125°C. The device guarantees stability with ceramic output capacitors between 1µF and 22µF. Quiescent current is typically 95µA in active mode, dropping below 1µA in shutdown. Dropout voltage is typically 45mV at full load.

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

• Ultra-low dropout performance ensures efficient regulation even under minimal voltage headroom conditions.
• 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.
• Built-in over-current and over-temperature protection safeguards against fault conditions.

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

• Mobile phones and PDAs
• MP3 players and portable media devices
• Digital cameras and handheld computers

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 fixed output voltage aligns with system requirements before procurement. Ensure the supplier provides RoHS-compliant and lead-free units consistent with manufacturer specifications.

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

Select this component for battery-powered designs requiring high efficiency and minimal external components. The device supports low-ESR ceramic capacitors, simplifying board layout. Consider the thermal resistance characteristics of the chosen package when designing for high ambient temperatures or continuous full-load operation.

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

This LDO belongs to the AS13985 family of micropower regulators designed for mobile and handheld electronics. 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 output voltage and package style.

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

No public substitute part numbers are documented in the provided datasheet.

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

What is the maximum recommended output capacitance?

The device is 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.