S-1131B21UC-N4GTFG

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

The S-1131B21UC-N4GTFG is a positive voltage regulator from the ABLIC S-1131 Series, featuring low dropout voltage and high ripple rejection. It provides a fixed output voltage of 2.1 V with an accuracy of ±1.0%. The device supports an output current up to 300 mA when the input voltage exceeds the set output voltage by at least 1.0 V. It operates within an ambient temperature range of -40°C to +85°C and includes built-in overcurrent protection and an ON/OFF circuit for power management.

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

• Built-in low on-resistance transistor enables low dropout voltage operation.
• Integrated overcurrent protection circuit limits output current to protect the load transistor.
• ON/OFF circuit allows control of regulator operation to minimize current consumption during standby.
• High ripple rejection capability ensures stable output under noisy input conditions.

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

• Constant-voltage power supply for DVD and CD-ROM drives
• Constant-voltage power supply for battery-powered devices
• Constant-voltage power supply for personal communication devices
• Constant-voltage power supply for notebook PCs

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

Verify that the component matches the exact part number S-1131B21UC-N4GTFG, specifically confirming the 2.1 V output voltage, UC package designation (SOT-89-5), and G environmental code. Ensure the source document confirms this specific suffix combination. Note that the datasheet indicates this series is not recommended for new design; confirm if alternative components are preferred for new projects.

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

Select this component when a fixed 2.1 V output is required with moderate current capabilities up to 300 mA. The SOT-89-5 package is suitable for applications requiring an ON/OFF pin for power control. Ensure the application environment stays within the specified -40°C to +85°C operating temperature range. Consider the need for external capacitors with appropriate ESR values to maintain stability.

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

This part belongs to the S-1131 Series of CMOS voltage regulators developed by ABLIC Inc. The series is characterized by high accuracy, low current consumption, and robust protection features. The S-1131B21UC-N4GTFG specifically utilizes the SOT-89-5 package and includes a positive logic ON/OFF pin, distinguishing it from variants without this feature or with different package types.

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

Public confirmed substitute part numbers are not provided in the source material. Users should consult ABLIC sales offices for potential replacements or updated designs, as the series is marked as not recommended for new design.

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

What is the function of the NC pin in the SOT-89-5 package?

The NC pin is electrically open and can be connected to the VIN pin or the VSS pin. It does not serve any active function in the circuit.

How does the ON/OFF pin operate in the S-1131B21UC variant?

The 'B' in the part number indicates positive logic. The regulator turns ON when the ON/OFF pin voltage is high (≥1.5 V) and turns OFF when the voltage is low (≤0.3 V).