AS13985F18-T

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

The AS13985F18-T is a micropower low-dropout linear regulator (LDO) manufactured by ams-OSRAM USA INC. It provides a fixed 1.8V output with a guaranteed maximum load current of 150mA. The device operates within an input voltage range of 2.5V to 5.5V and maintains high accuracy across temperatures from -40°C to +125°C. Key electrical parameters include a typical dropout voltage of 45mV at full load, a quiescent current of 95µA in active mode, and less than 1µA in shutdown. Stability is ensured using ceramic capacitors between 1µF and 22µF.

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

• Ultra-low dropout voltage performance ensures efficient power delivery under minimal headroom conditions.
• Integrated over-current and over-temperature protection mechanisms safeguard the device during fault conditions.
• Low-noise architecture allows direct connection to sensitive circuits without additional filtering networks.
• Automatic sleep mode significantly reduces quiescent current consumption when disabled.

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 fixed output voltage aligns with system requirements before procurement. Ensure compliance with RoHS standards and lead-free manufacturing specifications for environmental adherence.

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

Select this component for battery-powered designs requiring stable regulation with minimal external components. The device supports low-ESR ceramic output capacitors ranging from 1µF to 22µF, 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

The AS13985 belongs to a family of micropower LDO regulators designed for mobile and handheld electronics. It features a PNP pass element structure optimized for low noise and high power supply rejection ratio (PSRR). The series offers multiple fixed output voltage options, allowing designers to standardize on a single regulator topology across various product lines.

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

Public confirmed substitute part numbers are not provided in the source material.

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

What is the minimum recommended output capacitance for stability?

The device is stable with ceramic output capacitors having a capacitance value between 1µF and 22µF.

How does the bypass pin affect output noise?

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

What is the logic threshold for enabling the regulator?

The output is enabled when the EN pin voltage is greater than or equal to 1.2V and disabled when it is less than or equal to 0.4V.