R1122N191A-TR-FE

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

The R1122N191A-TR-FE is a CMOS-based low noise 150mA LDO regulator from the R1122N series. It features a fixed output voltage of 1.9V with an accuracy of ±2.0%. The device operates within an input voltage range of 2.0V to 6.0V and delivers up to 150mA output current. Key electrical parameters include a typical supply current of 100μA, standby current of 0.1μA, dropout voltage of 0.25V at 100mA, and ripple rejection of 80dB at 1kHz. It utilizes an SOT-23-5 package.

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

• Built-in chip enable circuit with active low logic for power management
• Fold-back protection circuit limits short-circuit current to approximately 30mA
• Optimized for excellent line and load transient response suitable for sensitive communication equipment

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

• Power source for cellular phones such as GSM, CDMA, and PCS
• Power source for domestic appliances including cameras, VCRs, and camcorders
• Power source for battery-powered portable equipment

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

Verify the specific output voltage designation (1.9V) and the active-low Chip Enable configuration (suffix A) against the design requirements. Confirm that the SOT-23-5 package dimensions align with the PCB footprint. Ensure external capacitors meet the recommended ESR specifications to maintain stability and prevent oscillation during operation.

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

Select this component when a fixed 1.9V rail is required with minimal quiescent current consumption. The active-low CE pin allows for easy integration with microcontrollers or power switches. Consider the thermal dissipation capabilities of the SOT-23-5 package under maximum load conditions and ambient temperature constraints.

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

This part belongs to the R1122N series of low noise 150mA LDO regulators manufactured by Nisshinbo Micro Devices. The series is characterized by high output voltage accuracy, extremely low supply current, and low ON-resistance. It is designed for applications requiring stable power supplies in compact, battery-operated devices.

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

The datasheet notes that the pin-out is similar to the TK112 and TK111. Verify compatibility regarding pin definitions and electrical characteristics before substituting these parts.