AS1359-BTTT-28

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

The AS1359-BTTT-28 is a 300mA ultra-low-noise low-dropout linear regulator with a fixed 2.8V output, housed in a TSOT23-5 package. It features a 40µA quiescent current and achieves a dropout voltage of 140mV at full load. The device provides 9µVRMS output noise (100Hz–100kHz) and over 80dB PSRR up to 10kHz. It operates within a 2V to 5.5V input range and includes integrated thermal shutdown and current limiting for robust protection.

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

• Ultra-low noise architecture delivering 9µVRMS output ripple
• High power-supply rejection ratio exceeding 80dB across critical frequencies
• Integrated P-channel MOSFET pass transistor for minimal quiescent current consumption
• Built-in thermal and current protection mechanisms

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-28 against manufacturer documentation to confirm the 300mA load rating and 2.8V fixed output configuration. Ensure compatibility with the required TSOT23-5 footprint and validate that the application environment remains within the specified -40°C to +85°C operating temperature range.

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

Select this component when space-constrained designs require high current capability alongside stringent noise suppression standards. The low dropout characteristic supports extended battery life by maximizing usable energy from the source. Verify that the external capacitor selection aligns with stability requirements for the chosen dielectric type.

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

This part belongs to the AS1358/AS1359 series of low-dropout regulators designed for portable electronics. While the AS1358 variant offers 150mA capacity, the AS1359 provides double the continuous output current. Both share identical architectural features, including the ultra-low noise bypass pin and compact packaging suitable for dense PCB layouts.

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

The AS1358-BTTT-28 serves as a direct functional substitute if the system design accommodates a reduced 150mA maximum load current requirement while maintaining the same 2.8V output specification.

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

How does the BYPASS pin affect the regulator's performance?

Connecting a 10nF capacitor between the BYPASS pin and the OUT pin significantly reduces output voltage noise, achieving the specified 9µVRMS level.

What happens during a thermal overload condition?

If the junction temperature exceeds 160°C, the internal thermal sensor disables the pass transistor to protect the device, re-enabling it only after the temperature drops by approximately 15°C.