AS1353-18-T

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

The AS1353-18-T is a fixed-voltage linear low-dropout regulator (LDO) manufactured by ams OSRAM USA INC. It provides a stable 1.8V output with a maximum current capacity of 150mA. The device operates within an input voltage range of 2.5V to 5.5V and features ultra-low dropout characteristics, achieving 40mV at a 100mA load. It incorporates integrated P-channel MOSFET technology for efficient power management. Key electrical specifications include a shutdown current of less than 1µA, high power-supply rejection ratio (PSRR) of 60dB at 100Hz, and output voltage accuracy of ±1%. The component includes comprehensive protection mechanisms such as over-current limiting, thermal overload protection, and reverse-battery protection.

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

• Integrated P-channel MOSFET pass transistor enables low quiescent current consumption across varying load conditions.
• Built-in reverse-battery protection disconnects internal circuitry if the battery polarity is connected incorrectly.
• Active-low shutdown logic reduces supply current to minimal levels when the SHDNM pin is grounded.
• On-chip current limiting and thermal shutdown safeguards prevent damage during short-circuit or overheating events.

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

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

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

Verify the specific part number AS1353-18-T against official manufacturer documentation to confirm the 1.8V fixed output and SOT-23-5 package configuration. Ensure compatibility with required capacitor values for stability. Check current product status as availability may vary. Confirm that the active-low shutdown functionality aligns with system control logic requirements before finalizing procurement decisions.

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

Select this component for applications requiring a fixed 1.8V rail with moderate current demands up to 150mA. The SOT-23-5 package suits space-constrained designs. Consider the -40°C to +85°C operating temperature range for standard commercial environments. Verify that the input voltage remains within the 2.5V to 5.5V window to ensure proper regulation and dropout performance under all expected load conditions.

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

The AS1353 series belongs to a family of high-performance linear LDOs designed for battery-operated electronics. This specific variant, the AS1353-18-T, is distinguished by its 1.8V nominal output voltage. It shares core architectural features with other members of the AS1353/AS1356 family, including reverse-battery protection and thermal shutdown, but lacks the Power-OK monitoring feature found in the AS1356 sub-series.

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

Consult official cross-reference tools for compatible alternatives. Verify that any substitute maintains identical pinout configurations, output voltage accuracy, and current capabilities. Ensure replacement components support the same SOT-23-5 packaging and meet the required thermal and electrical specifications for the intended application environment.

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

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

The BP pin serves as a reference-noise bypass terminal. Connecting a 0.01µF ceramic capacitor to this pin reduces output noise and improves overall regulator performance.

How does the device handle reverse battery connection?

The AS1353-18-T includes integrated reverse-battery protection circuitry. If the battery is connected with incorrect polarity, the internal circuitry and parasitic diodes are disconnected to prevent damage.

What is the purpose of the SHDNM pin?

The SHDNM pin is an active-low shutdown input. Applying a logic low signal to this pin activates shutdown mode, reducing the supply current to less than 1µA.