AS1353-33-T

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

The AS1353-33-T is a fixed-voltage linear low-dropout regulator (LDO) manufactured by ams OSRAM USA INC. It provides a stable 3.3V output with a maximum current capability of 150mA. The device features an integrated P-channel MOSFET pass transistor, enabling ultra-low dropout voltage and minimal quiescent current consumption. Key electrical specifications include an input voltage range of 2.5V to 5.5V, output voltage accuracy of ±1%, and high power-supply rejection ratio (PSRR) of 60dB at 100Hz. Integrated protection mechanisms include over-current limiting, thermal shutdown, and reverse-battery protection. The component is housed in a compact 5-pin SOT23 package suitable for surface-mount applications.

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

• Ultra-low dropout voltage performance ensures efficient operation under low supply conditions.
• Integrated reverse-battery protection disconnects internal circuitry during incorrect polarity connection.
• Active-low shutdown input significantly reduces supply current when the device is inactive.
• Built-in thermal overload and over-current protection safeguards against short-circuit and overheating events.

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

• Powering cordless and mobile phones
• Supplying MP3 players and portable audio devices
• Powering handheld computers and PDAs
• Providing regulated voltage for digital cameras

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

Verify the specific ordering suffix and manufacturer documentation before integration. Confirm that the component meets all environmental and safety standards required for your target market. Review the datasheet for absolute maximum ratings to ensure operational limits are not exceeded. Check for any recent updates or revisions to the product specifications. Ensure compatibility with your PCB layout and capacitor selection guidelines.

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

Select this component for applications requiring a fixed 3.3V rail with moderate current demands up to 150mA. Consider the SOT23-5 package for space-constrained designs. Evaluate the dropout voltage characteristics relative to your minimum input voltage requirements. Verify that the external capacitor values align with stability requirements. Assess the thermal management needs based on expected power dissipation in your specific operating environment.

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

This LDO belongs to the AS1353/AS1356 family of low-dropout regulators designed for battery-powered portable electronics. The series offers various fixed output voltages ranging from 1.5V to 3.6V. The AS1353 variant focuses on basic regulation with reverse-battery protection, while the AS1356 adds a Power-OK signal. Both share similar core architectures optimized for low noise and high efficiency in small form factors.

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

Consult official cross-reference tools for compatible alternatives. Verify pinout compatibility and electrical parameter equivalence before substitution. Ensure the replacement part supports the same package type and operating temperature range. Review the new component's datasheet for any differences in startup behavior or capacitor requirements.

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

What is the function of the BP pin on the AS1353?

The BP pin is used for reference-noise bypass. Connecting a 0.01µF ceramic capacitor to this pin reduces output noise.

How does the device handle reverse battery connection?

The AS1353 includes integrated reverse-battery protection that disconnects the internal circuitry and parasitic diodes if the battery is connected incorrectly.

What is the typical quiescent current of the AS1353-33-T?

The ground pin current (quiescent current) is typically 70µA at 100µA load and 115µA at 150mA load.