AS1353-36-T

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

The AS1353-36-T is a fixed-voltage linear low-dropout regulator (LDO) manufactured by ams OSRAM, delivering a nominal output of 3.6V with a maximum load current of 150mA. It operates within an input voltage range of 2.5V to 5.5V and maintains an output voltage accuracy of ±1% at 25°C. The device features ultra-low dropout characteristics, reaching 40mV at a 100mA load, and achieves high power-supply rejection ratios of 60dB at 100Hz. Integrated protections include over-current limiting up to 380mA typical, thermal shutdown at 150°C, and reverse-battery protection. It utilizes a P-channel MOSFET pass transistor for low quiescent current consumption.

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

• Integrated P-channel MOSFET pass transistor enables superior performance under low dropout conditions while maintaining low supply current across varying loads.
• Built-in logic-controlled shutdown circuitry reduces supply current to less than 1µA when the active-low SHDNM pin is asserted.
• Comprehensive protection mechanisms include integrated over-temperature sensing, over-current limiting, and reverse-battery protection that disconnects internal circuitry upon incorrect polarity connection.
• Optimized for stability with minimal external components, specifically designed for use with low equivalent-series resistance ceramic capacitors ranging from 1µF to 10µF.

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

• Powering mobile phones and cordless devices
• Supplying MP3 players and handheld computers
• Providing regulated voltage for digital cameras
• Supporting PDAs and other battery-powered portable electronics

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

Verify the specific ordering suffix '-T' corresponds to the tape and reel delivery form required for your assembly process. Confirm the manufacturer designation as austriamicrosystems AG or ams AG, noting that technical content remains valid despite corporate name changes. Ensure compatibility with the 5-pin SOT23 package dimensions and verify RoHS compliance status through official documentation before finalizing procurement.

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

Select this component when a fixed 3.6V output is required for battery-operated systems needing efficient regulation near end-of-life battery voltages. The AS1353 variant is suitable for designs not requiring a power-good signal, unlike the AS1356. Consider the thermal resistance and ambient temperature constraints, as the ground pin serves as a heat sink. Ensure input voltage stays within the 2.5V to 5.5V range to maintain proper operation and protection functionality.

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

The AS1353-36-T belongs to the AS1353/AS1356 family of linear LDO regulators developed by austriamicrosystems AG, now part of ams OSRAM. This series is engineered for portable consumer electronics where space and power efficiency are critical. The -36 suffix specifically denotes the 3.6V fixed output version. The device is housed in a compact 5-pin SOT23 package, facilitating integration into dense printed circuit board layouts for mobile and handheld applications.

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

Consult official cross-reference tools for compatible semiconductor alternatives if supply chain disruptions occur. Verify functional equivalence regarding output voltage, current capacity, and package type. Review datasheets carefully to confirm pinout compatibility and electrical specifications match the original design requirements before substituting.

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

How does the AS1353 handle reverse battery connections?

The device includes integrated reverse-battery protection circuitry that monitors the polarity of the input pins. If the battery is connected incorrectly, it disconnects the internal circuitry and parasitic diodes, limiting reverse supply current to 1mA.

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

The BP pin is a reference-noise bypass terminal. Connecting a low-leakage 0.01µF ceramic capacitor to this pin reduces output noise. Using a larger capacitance improves noise performance but increases start-up time.

What happens during a thermal overload condition?

If the junction temperature exceeds approximately 150°C, the integrated thermal sensor triggers shutdown logic, switching off the P-channel MOSFET. The device automatically restarts once the temperature drops by about 20°C.