S-1122B31MC-L8QTFU

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

The S-1122B31MC-L8QTFU is a positive voltage regulator from the S-1122 Series, manufactured by ABLIC Inc. It provides a fixed output voltage of 3.1 V with an accuracy of ±1.0%. The device operates within an input voltage range of 2.0 V to 6.5 V and supports an output current of up to 150 mA. Key electrical parameters include a dropout voltage of 0.25 V typ. at 100 mA, a ripple rejection ratio of 80 dB typ., and a current consumption of 50 µA typ. during operation. It features built-in overcurrent protection and an ON/OFF control circuit.

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

• Built-in low on-resistance transistor enables low dropout voltage and high output current capability.
• Integrated overcurrent protection circuit limits load current to prevent damage.
• ON/OFF circuit allows for significant reduction in current consumption when disabled.
• Compatible with small ceramic capacitors for stable phase compensation.

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

• Constant-voltage power supply for battery-powered devices
• Constant-voltage power supply for personal communication devices
• Constant-voltage power supply for home electric appliances
• Constant-voltage power supply for cellular phones

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

Verify the specific suffix L8QTFU against official documentation to confirm pin configuration and environmental compliance. Ensure the ordering code matches the required SOT-23-5 package and positive logic ON/OFF pin type. Confirm RoHS and halogen-free status as specified in the datasheet product name structure before finalizing procurement orders.

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

Select this component for applications requiring a precise 3.1 V rail with minimal voltage drop under load. Consider the 150 mA output limit and package power dissipation constraints when designing for higher currents. Verify that the external capacitor meets the ESR requirements for stability. Ensure the input voltage remains within the absolute maximum ratings to avoid device failure.

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

This part belongs to the S-1112/1122 Series of CMOS voltage regulators. The S-1122 variant specifically utilizes a different pin configuration compared to the S-1112 series while sharing similar electrical characteristics. Both series are designed for high-density mounting in compact electronic devices using SOT-23-5 packages.

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

Direct substitutes within the same series include other S-1122B31MC variants with different suffixes (e.g., L8ATFx) which may differ in ON/OFF logic or tape specifications. Cross-series replacement requires verifying pin compatibility and electrical parameter alignment.

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

What is the function of the NC pin in the SOT-23-5 package?

The NC pin is electrically open and can be connected to either the VIN pin or the VSS pin depending on the design requirement.

How does the ON/OFF pin control the regulator?

For Type B products like this one, setting the ON/OFF pin to a High level activates the regulator, while a Low level stops operation and reduces current consumption.