R1171S251B-E2-FE

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

The R1171S251B-E2-FE is a fixed-output CMOS Low Dropout (LDO) voltage regulator manufactured by Nisshinbo Micro Devices. It provides a stable 2.5 V output with a maximum continuous current of 1.5 A. The device operates within an input voltage range of 2.1 V to 6 V and features a typical dropout voltage of 90 mV, with a maximum of 180 mV. Key electrical specifications include a power supply rejection ratio (PSRR) of 50 dB, line regulation of 0.05 %/V, and load regulation of 10 mV. Quiescent current is 130 uA, and the unit supports a power dissipation of 1.7 W. It is housed in an HSOP-6J-6 package and functions reliably across a temperature range of -40 C to +85 C.

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

• CMOS LDO architecture designed for low quiescent current operation
• Fixed 2.5 V output with high accuracy voltage regulation
• Capable of delivering up to 1.5 A output current
• Low dropout voltage characteristics for efficient power management

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

• Portable electronic devices requiring stable low-voltage power rails
• Battery-powered systems utilizing single-cell or dual-cell configurations
• Embedded circuits needing precise voltage reference sources
• General-purpose linear regulation in compact surface-mount designs

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

Verify the specific suffix E2-FE against official datasheets to confirm package type and tape-and-reel configuration. Ensure compatibility with HSOP-6J-6 footprint requirements during PCB layout. Confirm RoHS compliance status through manufacturer documentation before integration into regulated assemblies.

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

Select this component when a fixed 2.5 V rail is required with moderate current demands up to 1.5 A. Consider the 2.1 V minimum input constraint for battery applications. Evaluate thermal performance given the 1.7 W power dissipation limit in the HSOP-6J-6 package. Compare PSRR and dropout specs against system noise and efficiency requirements.

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

This part belongs to the R1171S series of low-dropout regulators from Nisshinbo Micro Devices. The series is characterized by CMOS technology offering low standby current and high ripple rejection. The R1171S251B variant specifically denotes the 2.5 V fixed output version within this family, sharing common architectural features with other output voltage options in the same series.

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

What is the maximum output current capability of the R1171S251B-E2-FE?

The device supports a maximum output current of 1.5 A.

Does the R1171S251B-E2-FE have adjustable output voltage?

No, it is a fixed-output regulator providing a constant 2.5 V.

What is the typical power supply rejection ratio (PSRR)?

The typical PSRR is 50 dB.