S-1131B18UA-N4DTFU

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

The S-1131B18UA-N4DTFU is a positive voltage regulator from the ABLIC S-1131 Series, utilizing CMOS technology. It provides a fixed output voltage of 1.8 V with an accuracy of ±1.0%. The device supports an output current up to 300 mA and features a typical dropout voltage of 0.75 V at 100 mA. Operating current consumption is 35 µA typically during operation and 0.1 µA in power-off mode. It includes built-in overcurrent protection and an ON/OFF circuit for battery life extension. The component operates within a temperature range of -40°C to +85°C and is housed in a lead-free SOT-89-3 package.

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

• Built-in low on-resistance P-channel MOS FET transistor enables low dropout voltage performance.
• Integrated overcurrent protection circuit limits load current to prevent damage to the output transistor.
• Dedicated ON/OFF control pin allows complete shutdown of internal circuits to minimize standby current consumption.
• High ripple rejection capability ensures stable output voltage against input noise variations.

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

• Constant-voltage power supply for DVD and CD-ROM drives
• Power regulation for battery-powered devices
• Voltage regulation for personal communication equipment
• Power supply units for notebook PCs

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

Verify that the specific ordering suffix matches the required package type (SOT-89-3) and environmental code (U for lead-free/halogen-free). Confirm the product type 'B' indicates positive logic for the ON/OFF pin functionality. Ensure the datasheet revision aligns with design requirements as this series is marked not recommended for new designs.

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

Select this component when a fixed 1.8 V output is required with moderate current capabilities up to 300 mA. Consider the SOT-89-3 package constraints regarding power dissipation at high loads. Verify that the application utilizes a tantalum output capacitor with appropriate ESR to maintain stability, as ceramic capacitors may require additional series resistance.

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

This part belongs to the S-1131 Series of middle output current CMOS voltage regulators manufactured by ABLIC Inc. The series offers various fixed output voltages selectable in 0.1 V steps ranging from 1.5 V to 5.5 V. It is designed for applications requiring high accuracy and low quiescent current in compact surface-mount packages.

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

Direct substitutes include other S-1131B18 variants such as S-1131B18UC-N4DTFU (SOT-89-5 package) or S-1131B18PD-N4DTFz (6-Pin HSON(A) package), provided the pinout differences are accommodated in the design.

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

How does the ON/OFF pin function for the 'B' product type?

For the 'B' product type, applying a High level turns the regulator ON, while applying a Low level turns it OFF, reducing current consumption significantly.

What is the recommended output capacitor for stable operation?

A tantalum capacitor of 2.2 µF or more is recommended to ensure stable operation due to its Equivalent Series Resistance (ESR) characteristics.