AP2121AK-2.5TRE1

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

The AP2121AK-2.5TRE1 is a positive voltage regulator IC fabricated by Diodes Incorporated using CMOS process technology. It provides a fixed output voltage of 2.5V with an output current capability exceeding 200mA and a short-circuit limit of 300mA. The device operates within an input voltage range of 2V to 6V and features a typical dropout voltage of 250mV at full load. Key electrical characteristics include a quiescent current of 25µA, standby current of 0.1µA, power supply rejection ratio of 70dB at 1kHz, and output noise of 30µVrms from 10Hz to 100kHz. It offers high output voltage accuracy of ±2% and includes an active-high enable pin.

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

• Features extremely low output noise suitable for sensitive RF applications
• Includes an active-high chip-enable circuit for power management
• Compatible with low ESR ceramic capacitors as small as 1µF
• Provides excellent line and load transient response

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

• Mobile phones and cordless phones
• Wireless communication equipment
• Portable games and cameras
• Battery-powered equipment

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

Verify component authenticity through authorized channels due to the presence of counterfeits in the market. Confirm that the received part matches the specific ordering suffix 'AK' which indicates the SOT-23-5 package with an active-high enable function. Ensure compliance with RoHS3 standards if required by your manufacturing specifications.

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

Select this component when a stable 2.5V rail is needed for low-noise circuits powered by single-cell lithium batteries or similar sources. The SOT-23-5 package allows for compact board designs while providing thermal performance adequate for moderate loads. Consider the 250mV dropout voltage to ensure sufficient headroom between input and output voltages under all operating conditions.

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

This device belongs to the AP2121 series of high-speed, extremely low-noise LDO regulators. The series encompasses various fixed output voltages ranging from 1.2V to 3.3V. While the AP2121 series was widely used, Diodes Incorporated recommends using the AP7343 for new designs, indicating this part may be phased out or superseded in future product lines.

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

Diodes Incorporated explicitly recommends the AP7343 series as a replacement for new designs. Verify pinout compatibility and electrical parameter equivalence before substituting.