RP123K281D-TR

Product Overview

RP123K281D-TR from Nisshinbo Micro Devices Inc. is a single-channel positive fixed linear voltage regulator in the RP123x series, providing a 2.8 V output at up to 250 mA. The device uses a 4-UDFN exposed-pad surface-mount package with a DFN(PL)1010-4 package, and it operates over an ambient temperature range of -40°C to 85°C. Input voltage is up to 5.5 V, while dropout is 0.165 V at 250 mA. Control and protection features include enable and over-current protection, and quiescent current is 25 µA.

Key Features

• Fixed 2.8 V positive output from a single regulator channel, with 250 mA output current.
• Input voltage maximum is 5.5 V, and dropout is 0.165 V at 250 mA.
• Quiescent current is 25 µA, with PSRR of 90 dB to 65 dB from 1 kHz to 100 kHz.
• Enable control and over-current protection are included.
• Surface-mount 4-UDFN exposed-pad package, DFN(PL)1010-4, with operating temperature range of -40°C to 85°C (TA).

Applications

• Battery-powered portable devices requiring a fixed 2.8 V rail and low quiescent current.
• Microcontroller or sensor subsystems where an enable signal can control the regulator output.
• Mixed-signal boards where supply rejection from 1 kHz to 100 kHz is relevant to input filtering.
• Load points where over-current protection is required at up to 250 mA output.

Design & Procurement Notes

Design notes should account for the fixed 2.8 V output, 5.5 V maximum input voltage, and 250 mA maximum output current. Because dropout is 0.165 V at 250 mA, input-to-output headroom should be checked across the load and temperature range. The enable control supports controlled output state management during system sequencing, while over-current protection addresses output current faults. Layout should match the 4-UDFN exposed-pad, DFN(PL)1010-4 surface-mount package, including provisions for the exposed pad. The 25 µA quiescent current and 90 dB to 65 dB PSRR from 1 kHz to 100 kHz are relevant when selecting input filtering and managing supply noise, and the operating range of -40°C to 85°C (TA) should be considered for board thermal layout.