AP2122AK-2.8TRE1

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

The AP2122AK-2.8TRE1 is a positive voltage regulator IC fabricated by CMOS process, featuring a fixed output voltage of 2.8V and an input voltage range from 2V to 6V. It provides a maximum output current exceeding 150mA with a typical dropout voltage of 150mV at 100mA load. The device incorporates extremely low noise characteristics, delivering 30µVrms within the 10Hz to 100kHz bandwidth, alongside high ripple rejection of 70dB at 10kHz. Quiescent current is typically 25µA, while standby current drops to 0.1µA. It includes an active-high chip enable circuit and operates reliably across a junction temperature range of -40°C to +85°C.

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

• Extremely low output noise for sensitive analog applications
• High power supply ripple rejection ratio
• Active-high chip enable pin with internal pull-down resistor
• Compatible with low ESR ceramic capacitors

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

• Mobile phones and cordless phones
• Portable electronic devices such as MP3/4 players
• Cameras and video recorders
• Sub-board power supplies for telecom equipment
• Battery-powered equipment

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

Verify component authenticity through authorized Diodes Incorporated channels or certified distributors. Confirm RoHS compliance status and check for recent Product Change Notifications (PCN) regarding manufacturing site changes. Ensure storage conditions meet moisture sensitivity level requirements before soldering. Validate that the specific ordering suffix matches the required package and environmental specifications.

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

Select this regulator when ultra-low noise performance is critical for RF or audio circuits. Verify that the input voltage remains within the specified 2V to 6V range under all operating conditions. Ensure the output capacitor meets the minimum capacitance and equivalent series resistance requirements for stability. Consider the thermal resistance characteristics if the ambient temperature approaches the upper operational limit.

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

This component belongs to the AP2122 series of high-speed, extremely low noise LDO regulators manufactured by Diodes Incorporated. The series offers multiple fixed output voltage options including 1.5V, 1.8V, 2.5V, 3.0V, 3.2V, and 3.3V. All variants share the same SOT-23-5 package and core architectural features designed for battery-powered portable electronics requiring stable and clean power delivery.

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

The datasheet explicitly recommends using the AP7315 as a replacement for new designs. Verify electrical compatibility and pinout alignment before substituting.