AS1361-BTTT-45

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

The AS1361-BTTT-45 is a low-dropout linear regulator delivering a fixed 4.5V output with a maximum continuous current of 150mA. It operates from an input voltage range of 2V to 5.5V and achieves a typical dropout voltage of 95mV 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 includes integrated overcurrent and thermal protection, a Power-OK indicator, and is housed in a TSOT23-6 package.

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

• Ultra-low noise architecture achieving 9µVRMS output noise for sensitive analog circuits
• Integrated P-channel MOSFET pass transistor ensures extremely low quiescent current consumption
• Active-Low open-drain Power-OK output provides reliable status indication for system monitoring
• Operates stably with small 1µF ceramic capacitors across the entire load range

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 AS1361-BTTT-45 against official manufacturer documentation to confirm the 4.5V preset output and 150mA rating. Ensure compatibility with the required TSOT23-6 surface-mount footprint during procurement. Confirm RoHS compliance and lead finish specifications prior to finalizing supply agreements.

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

Select this component when designing space-constrained portable electronics requiring stable 4.5V rails. The 150mA current limit suits moderate loads, while the ultra-low noise profile benefits RF and sensor subsystems. Verify that the input voltage remains within the 2V to 5.5V window and that the application can accommodate the specified 1µF ceramic capacitor requirements for optimal stability.

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

This regulator belongs to the AS1361/AS1362 family of ultra-low-noise LDOs designed by austriamicrosystems (now ams OSRAM). The series targets mobile and battery-operated applications where power efficiency and signal integrity are critical. The AS1361 variant specifically provides 150mA capability, distinguishing it from the higher-current AS1362 counterpart within the same architectural framework.

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

Cross-reference tools indicate compatible alternatives exist among other manufacturers offering similar low-noise LDO specifications. Verify pinout compatibility and electrical parameters before substitution. Consult official cross-reference databases for validated replacements ensuring equivalent performance in mobile and portable applications.

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

How does the BYPASS pin reduce output noise?

Connecting a 10nF capacitor between the BYPASS pin and OUT activates internal noise reduction circuitry, lowering output noise to 9µVRMS.

What is the function of the SHDNN pin?

Driving the SHDNN pin low disables the regulator, reducing quiescent current to less than 500nA and placing the output in a high-impedance state.

Does the device support indefinite short-circuit conditions?

Yes, the integrated current limiting circuitry protects the device, allowing the output to be shorted to ground indefinitely without damage.