AS13985H29-T

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

The AS13985H29-T is a micropower 150mA low-dropout linear voltage regulator manufactured by ams OSRAM. It provides a fixed output voltage of 2.9V and operates within an input supply range of 2.5V to 5.5V. The device features ultra-low dropout voltage, typically 45mV at 150mA load, and maintains high output voltage accuracy of ±1%. It is designed for stability with ceramic output capacitors ranging from 1µF to 22µF. The component includes integrated over-temperature and over-current protection, ensuring reliable operation in battery-powered applications.

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

• Ultra-low dropout voltage performance ensures efficient regulation even under minimal input-to-output voltage differentials.
• Integrated over-temperature and over-current protection mechanisms safeguard the device against thermal and electrical stress conditions.
• Low quiescent current consumption supports extended battery life in portable electronic devices.
• Stable operation guaranteed with low equivalent series resistance (ESR) ceramic output capacitors.

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

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

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

Verify that the ordering code matches the required output voltage and package type. Confirm RoHS compliance status as per manufacturer specifications. Ensure compatibility with standard surface-mount assembly processes for the SOT23-5 package. Check for any specific handling requirements related to moisture sensitivity classification before soldering.

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

Select this component when a fixed 2.9V output is required for noise-sensitive circuits powered by single-cell lithium batteries or similar sources. Consider the SOT23-5 package for space-constrained designs requiring robust thermal dissipation characteristics compared to WLP options. Evaluate the need for bypass capacitor integration on the BYPASS pin if ultra-low noise performance below 30µV RMS is critical for the application.

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. This specific variant utilizes the SOT23-5 package, offering a compact footprint suitable for dense PCB layouts. The 'H' suffix denotes the SOT23 package configuration, while '29' indicates the fixed 2.9V output voltage setting.

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

AS13985H33-T: Provides a 3.3V output instead of 2.9V; otherwise shares identical 150mA rating and SOT23-5 packaging.

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

What is the maximum operating junction temperature for the AS13985H29-T?

The maximum operating junction temperature is +125°C.

How does the enable pin logic function?

The EN pin enables the output when the voltage is ≥ 1.2V and disables it when ≤ 0.4V.