AS1353-30-T

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

The AS1353-30-T is a fixed-voltage linear low-dropout regulator (LDO) providing a nominal 3.0V output 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 40mV at 100mA. The device incorporates reverse-battery protection, over-current limiting (380mA typ), and thermal shutdown. It utilizes a P-channel MOSFET pass transistor for low quiescent current consumption and includes a logic-controlled shutdown mode reducing supply current to less than 1µA. The unit is housed in a 5-pin SOT23 package.

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

• Integrated P-channel MOSFET pass transistor enables low quiescent current operation across varying load conditions.
• Built-in reverse-battery protection disconnects internal circuitry if the battery polarity is incorrect.
• Active-low shutdown input allows for deep sleep modes with minimal power consumption.
• Comprehensive protection mechanisms include thermal overload shutdown and output short-circuit current limiting.

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 electronics

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

Verify that the specific part number matches the required output voltage and package type before procurement. Confirm that the supplier provides documentation consistent with the original manufacturer's datasheet specifications. Ensure compliance with environmental directives such as RoHS where applicable. Check for any specific handling requirements related to the surface-mount packaging format during storage and assembly processes.

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

Select this component when a stable 3.0V rail is needed from a single-cell lithium or alkaline battery source. The low dropout voltage extends battery life by allowing operation closer to the cell's discharge cutoff. The integrated reverse-battery protection simplifies design by preventing damage from incorrect power connection. Consider the AS1356 variant if a Power-OK signal is required for system monitoring.

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

This device belongs to the AS1353/AS1356 family of linear LDO regulators manufactured by ams OSRAM (formerly austriamicrosystems). These regulators are designed for portable applications requiring high efficiency and minimal external components. The series offers various fixed output voltages ranging from 1.5V to 3.6V, all sharing similar pinouts and protection features within the compact SOT23-5 footprint.

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

Direct functional substitutes within the same family include the AS1353-33-T for a 3.3V output or the AS1356-33-T if Power-OK functionality is desired. Cross-referencing tools may identify compatible parts from other manufacturers, but electrical parameters and pin configurations must be verified against the official datasheet to ensure compatibility.

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

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

The BP pin is a reference-noise bypass terminal. Connecting a 0.01µF ceramic capacitor to ground reduces output noise and improves performance.

How does the shutdown feature work?

Driving the SHDNM pin to a logic low level activates shutdown mode, reducing the supply current to less than 1µA. Connecting SHDNM to the IN pin enables normal operation.

Is the AS1353-30-T suitable for high-frequency switching noise environments?

The device offers a typical PSRR of 60dB at 100Hz. While effective for low-frequency noise, additional input/output capacitance may be required to attenuate higher-frequency switching noise effectively.