AS1358-BTTT-33

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

The AS1358-BTTT-33 is a low-dropout linear regulator delivering up to 150mA continuous output current with a preset 3.3V output voltage. It features an ultra-low noise profile of 9µVRMS and high power-supply rejection ratio exceeding 80dB up to 10kHz. The device operates within a 2V to 5.5V input range and achieves a dropout voltage as low as 70mV at 150mA load. Quiescent current is maintained at 40µA, dropping below 500nA in shutdown mode. Stability is ensured using only a 1µF ceramic capacitor at the output.

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
• High power-supply rejection ratio provides effective ripple suppression across frequencies
• Operates stably with small-value 1µF ceramic capacitors at any load condition

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
• Wireless LANs and handheld computers

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

Verify the specific ordering code AS1358-BTTT-33 against manufacturer documentation to confirm the 150mA load rating and 3.3V fixed output voltage. Ensure compatibility with the TSOT23 5-pin package dimensions and lead finish specifications. Confirm RoHS compliance and Pb-free status requirements for your assembly process before finalizing procurement.

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

Select this component when designing battery-powered systems requiring minimal ground current draw and stable regulation under varying loads. The integrated thermal protection and current limiting provide robust fault handling. Consider the 1.25V internal reference accuracy and line/load regulation characteristics to ensure precise voltage delivery for downstream components without external trimming.

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

This part belongs to the AS1358/AS1359 series of ultra-low-noise LDOs designed for space-constrained applications. Manufactured by austriamicrosystems AG (now onsemi), these regulators utilize advanced bandgap core technology. The series offers various preset voltages from 1.5V to 4.5V in 50mV increments, catering to diverse portable electronic needs.

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

Cross-reference with other 150mA LDOs featuring similar low-noise specifications and TSOT23-5 packaging. Verify pinout compatibility, particularly the SHDNN and BYPASS pin functions, to ensure seamless integration into existing designs without circuit board modifications.

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

How does the shutdown function operate?

Driving the SHDNN pin low disables the internal voltage reference and error amplifier, reducing supply current to less than 500nA and placing the output in a high-impedance state.

What is the recommended bypass capacitor value?

A 10nF (0.01µF) capacitor should be connected between the BYPASS pin and the OUT pin to achieve the specified ultra-low noise performance.

Does the device support indefinite short-circuit conditions?

Yes, the output can be shorted to ground indefinitely without causing damage due to integrated current limiting and thermal protection circuitry.