R1111N441B-TR-FE

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

The R1111N441B-TR-FE is a CMOS-based low noise LDO regulator from the R1111N series, manufactured by Nisshinbo Micro Devices. It provides a fixed output voltage of 4.4V with an accuracy of ±2.0%. The device operates within an input voltage range of 2.0V to 8.0V and delivers up to 150mA output current. Key electrical characteristics include a typical supply current of 35μA, standby current of 0.1μA, dropout voltage of 0.2V at 100mA, and ripple rejection of 70dB at 1kHz. It features a built-in chip enable circuit active high (Type B), fold-back protection, and is housed in an SOT-23-5 package.

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

• Built-in chip enable circuit for power management
• Fold-back protection circuit for short-circuit safety
• Low temperature-drift coefficient for stable operation
• High ripple rejection ratio for clean power delivery

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

• Power source for cellular phones such as GSM, CDMA and various kinds of PCSs
• Power source for battery-powered equipment
• Power source for electrical appliances such as cameras, VCRs and camcorders

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

Verify the specific output voltage designation matches the required system design, as the '44' suffix indicates 4.4V. Confirm the 'B' suffix corresponds to the active-high Chip Enable logic level required by the control interface. Ensure the SOT-23-5 package footprint aligns with the PCB layout specifications before finalizing procurement orders.

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

Select this component when a fixed 4.4V rail is needed with minimal quiescent current consumption. The active-high CE pin suits systems where a high signal enables regulation. Verify that the load current does not exceed 150mA and that the input voltage remains within the 2.0V to 8.0V operating range for optimal performance and stability.

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

This part belongs to the R1111N series of low noise 150mA LDO regulators. The series is characterized by high output voltage accuracy, extremely low supply current, and low ON-resistance. It is designed for applications requiring excellent line and load transient responses, making it suitable for portable communication devices and battery-operated electronics.

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

Check datasheets for alternative LDOs offering similar 4.4V fixed output and 150mA capability. Ensure replacement parts support active-high chip enable functionality if CE pin usage is critical. Verify package compatibility or adaptability, as the original uses SOT-23-5.

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

What is the logic level for the Chip Enable (CE) pin on the R1111N441B?

The 'B' suffix indicates that the Chip Enable circuit is active high. A voltage above the specified threshold enables the regulator, while a low voltage disables it.

Does the R1111N441B include over-current protection?

Yes, it includes a built-in fold-back protection circuit. The short-circuit current is limited to approximately 50mA to protect the device and the system.