AS1359-BTTT-15

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

The AS1359-BTTT-15 is a low-dropout linear regulator delivering a fixed 1.5V output with a maximum continuous current of 300mA. It operates within an input voltage range of 2V to 5.5V and achieves a typical dropout voltage of 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 includes integrated overcurrent and thermal protection and is housed in a TSOT23 5-pin package.

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 to minimize supply ripple impact
• Integrated P-channel MOSFET pass transistor ensures extremely low quiescent current consumption
• Operates stably with small 1µF ceramic capacitors at both input and output pins

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
• Handheld computers and PDAs

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

Verify the specific ordering code AS1359-BTTT-15 against manufacturer documentation to confirm the 300mA load current and 1.5V fixed output configuration. Ensure compatibility with the required TSOT23 5-pin surface mount package. Confirm that the application environment remains within the specified -40°C to +85°C operating temperature range for guaranteed performance.

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

Select this component when designing battery-powered systems requiring stable regulation under varying loads. The 300mA current capability supports higher power peripherals compared to the 150mA variant. The low dropout characteristic maximizes usable battery life by allowing operation closer to the cell's discharge cutoff voltage while maintaining regulation.

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

This part belongs to the AS1358/AS1359 series of ultra-low-noise LDOs from ams OSRAM (formerly austriamicrosystems). The series is engineered for space-constrained portable electronics, offering high PSRR and low noise without requiring large external components. The AS1359 specifically provides double the current capacity of the AS1358 model.

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

The AS1358-BTTT-15 serves as a lower-current alternative within the same family, providing 150mA instead of 300mA. Both share identical pinouts, packages, and electrical characteristics except for current limits.

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

What is the minimum capacitance required for stability?

The device requires only a 1µF capacitor at the input and a 1µF capacitor at the output for stability across all load conditions.

How does the shutdown function operate?

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