AS1363-BSTT-45

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

The AS1363-BSTT-45 is a low-dropout linear voltage regulator manufactured by ams-OSRAM USA INC. It operates from an input voltage range of +2.0V to +5.5V and delivers a guaranteed 500mA load current with a typical dropout voltage of 150mV at full load. This specific variant provides a factory-preset output voltage of 4.5V, internally trimmed for high accuracy within ±0.75% at 25°C. The device features a low quiescent current of 40µA typ. and a shutdown supply current of 30nA typ. It includes an active-low open-drain Power OK (POK) output, thermal overload protection, and output current limiting. The component is housed in a 6-pin SOT23 package.

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

• Delivers up to 500mA load current with low dropout voltage
• Factory-trimmed fixed output voltage for high precision
• Ultra-low shutdown current for battery-powered applications
• Integrated thermal overload and short-circuit protection

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

• Laptops
• PDAs
• Portable audio devices
• Mobile phones
• Cordless phones

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

Verify the exact ordering code against the manufacturer's official documentation to ensure correct output voltage and package configuration. Confirm that the required bypass capacitor specifications align with stability requirements. Check for any recent Product Change Notifications regarding manufacturing locations or material composition updates prior to finalizing procurement plans.

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

Select this component when a stable 4.5V rail is required from a 2.0V to 5.5V source with moderate current demands. Ensure the input voltage remains sufficiently above the output to maintain regulation under maximum load conditions. Consider the thermal resistance of the PCB layout if operating near maximum power dissipation limits. Verify compatibility with external capacitors to meet ESR requirements for stability.

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

The AS1363 series consists of low-dropout linear regulators designed for portable battery-operated equipment. The family includes both user-adjustable versions and fixed-output variants. The BSTT suffix indicates tape and reel packaging. The device utilizes a P-channel MOSFET pass transistor to achieve low quiescent current consumption, making it suitable for energy-efficient designs.

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

AS1363-BSTT-33

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

How is the output voltage set on the AS1363-BSTT-45?

The AS1363-BSTT-45 has a factory-preset output voltage of 4.5V. It does not require external resistors for voltage setting; the BYP pin is used instead to improve PSRR and noise performance.

What is the function of the POK pin?

The POK pin is an open-drain Power OK output that goes low when the output voltage falls below its nominal value by more than 6%. It can be used as a power-on-reset signal for controllers or to drive an LED indicator.