AS1356-30-T

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

The AS1356-30-T is a fixed-voltage linear low-dropout regulator (LDO) manufactured by ams OSRAM, delivering a nominal output of 3.0V with a maximum load current of 150mA. It operates within an input voltage range of 2.5V to 5.5V and features ultra-low dropout characteristics, achieving as low as 40mV at a 100mA load. The device incorporates integrated P-channel MOSFET technology for efficient power management, alongside essential protection mechanisms including over-current limiting, thermal shutdown, and reverse-battery protection. Additionally, it provides a Power-OK (POK) signal for system monitoring.

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

• Integrated Power-OK circuitry providing active-low open-drain output to monitor output regulation status
• Ultra-low dropout performance enabled by internal P-channel MOSFET pass transistor
• Comprehensive protection suite including thermal overload shutdown, current limiting, and reverse-battery protection

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

• Powering microprocessors in handheld devices
• Supplying cordless and mobile phones
• Powering portable MP3 players and digital cameras

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

Verify the specific ordering suffix matches the required output voltage and package configuration. Confirm that the component source aligns with the original manufacturer specifications. Ensure compatibility with standard surface-mount assembly processes for the 5-pin SOT23 package. Review the datasheet for any updates regarding environmental compliance or manufacturing changes before finalizing procurement orders.

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

Select this component when a stable 3.0V supply is required for battery-operated systems. The integrated Power-OK feature makes it suitable for applications needing precise voltage monitoring. Consider its low quiescent current and high PSRR for noise-sensitive circuits. Ensure the application utilizes ceramic capacitors with appropriate ESR values to maintain stability across the operating temperature range.

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

This part belongs to the AS1353/AS1356 family of linear LDO regulators designed for low-power applications. While the AS1353 lacks the Power-OK pin, the AS1356 variant includes this diagnostic capability. Both share identical electrical characteristics regarding dropout voltage, current limits, and protection features, differing primarily in the presence of the monitoring output.

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

Direct functional substitutes within the same family include the AS1356-27-T for 2.7V output and the AS1356-33-T for 3.3V output. These parts share the same package, pinout, and core electrical specifications, allowing for potential design flexibility if the output voltage requirement changes.

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

What is the function of the POK pin on the AS1356?

The POK pin is an active-low, open-drain output that indicates when the output voltage has fallen out of regulation due to conditions such as dropout, current limiting, or thermal shutdown.

How does the AS1356 handle reverse battery connection?

The device includes integrated reverse-battery protection circuitry that disconnects the internal circuitry and parasitic diodes if the battery polarity is incorrect, limiting reverse supply current to 1mA.