AS1359-BTTT-25

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

The AS1359-BTTT-25 is a low-dropout linear regulator delivering a fixed 2.5V output with a maximum continuous current of 300mA. It operates from an input voltage range of 2V to 5.5V and achieves a dropout voltage as low as 140mV at full load. The device features ultra-low output noise of 9µVRMS and high power-supply rejection ratio exceeding 80dB up to 10kHz. Quiescent current is maintained at 40µA, dropping below 500nA in shutdown mode. It utilizes a TSOT23-5 package and includes integrated overcurrent and thermal protection.

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

• Ultra-low noise architecture achieving 9µVRMS output noise for sensitive analog circuits
• High power-supply rejection ratio exceeding 80dB across the frequency spectrum
• Integrated P-channel MOSFET pass transistor ensures extremely low quiescent current consumption
• Operates stably with small 1µF ceramic capacitors at both input and output terminals

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

• Mobile phones and wireless communication devices
• Bluetooth portable radios and accessories
• Digital cameras and personal audio devices
• Battery-powered handheld computers and PDAs

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

Verify the specific ordering code AS1359-BTTT-25 against the manufacturer's latest documentation to confirm availability and lead times. Ensure compatibility with the required 2.5V output specification and 300mA load requirements. Confirm that the TSOT23-5 package dimensions align with your PCB footprint design constraints before finalizing procurement decisions.

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

Select this component when designing battery-operated systems requiring stable voltage regulation under varying load conditions. The low dropout characteristic maximizes usable battery life by allowing operation closer to the minimum cell voltage. The ultra-low noise profile makes it suitable for powering RF sections or precision analog sensors where signal integrity is critical. Verify thermal dissipation capabilities based on the expected ambient temperature and PCB copper area.

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

This part belongs to the AS1358/AS1359 series of ultra-low-noise LDOs manufactured by austriamicrosystems AG (now ams OSRAM). The series is engineered for space-constrained portable applications. The AS1359 variant specifically provides higher current capability compared to the AS1358, making it appropriate for loads demanding up to 300mA while maintaining strict noise and efficiency standards.

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

The AS1358-BTTT-25 serves as a lower-current alternative within the same family, offering 150mA output capability. Both share identical pinouts, packaging, and electrical characteristics except for maximum current ratings. Designers requiring reduced current draw may consider the AS1358 variant without modifying the surrounding circuit layout.