RP131K181D-TR

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

The RP131K181D-TR is a fixed positive low dropout regulator from the RP131x series, manufactured by Nisshinbo Micro Devices. It provides a fixed output voltage of 1.8 V with a maximum continuous output current capability of 1 A. The device operates within an input voltage range of 1.6 V to 6.5 V and features a typical supply current of 65 µA. It utilizes a DFN(PL)1820-6 package and includes built-in protection circuits for over-current, short-circuit, and thermal shutdown.

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

• CMOS-based architecture enabling high output current with low power consumption
• Integrated auto discharge function for rapid output voltage reduction during standby mode
• Built-in inrush current limit and fold-back protection circuitry
• High ripple rejection performance suitable for noise-sensitive applications

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

• Power source for battery-powered equipment
• Power source for portable communication equipment
• Power source for notebook PCs
• Rear stage regulation following DC/DC converters for low voltage-driven LSIs

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

Verify the specific suffix 'D' confirms the inclusion of the auto discharge function on the CE pin. Ensure the ordering code matches the DFN(PL)1820-6 package variant rather than other available packages like SOT-89-5 or HSOP-6J. Confirm RoHS compliance status directly with the manufacturer documentation prior to final procurement decisions.

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

Select this component when a stable 1.8 V rail is required at up to 1 A load current. The DFN(PL)1820-6 package is optimal for high-density board mounting. Consider the auto discharge feature if rapid power-down is necessary. Verify that external ceramic capacitors meet the recommended ESR requirements for stability across the operating temperature range.

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

This part belongs to the RP131x Series, which offers various output voltages from 0.8 V to 5.5 V in 0.1 V steps. The series supports multiple package options including DFN1616-6B, SOT-89-5, and TO-252-5-P2. The 'K' designation specifically identifies the DFN(PL)1820-6 package form factor within the product lineup.

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

RP131K181B-TR (Same voltage and package without auto discharge)

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

What is the function of the 'D' suffix in the part number?

The 'D' suffix indicates that the IC includes an auto discharge function, which rapidly lowers the output voltage to 0V when the chip enable signal switches to standby mode.

How does the CE pin control the device operation?

The Chip Enable (CE) pin is active high. Applying a high voltage activates the regulator, while applying a low voltage switches the device into standby mode with ultra-low supply current.