AP2125K-1.8TRG1

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

The AP2125K-1.8TRG1 is a positive voltage regulator IC fabricated using CMOS process technology, providing a fixed output of 1.8V with a maximum output current of 300mA. It operates within an input voltage range up to 6V and features a typical dropout voltage of 10mV at 10mA load. The device incorporates a chip enable circuit, current limit protection, and over temperature shut down (OTSD) mechanisms. It delivers high ripple rejection of 70dB typical and maintains low quiescent current consumption.

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

• Integrates a chip enable pin for active-high logic control to manage power states
• Includes built-in current limit and thermal shutdown circuits for fault protection
• Compatible with low ESR ceramic capacitors for stable operation

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

• CDMA/GSM Cellular Handsets
• Battery-powered Equipments
• Laptops, Palmtops, Notebook Computers
• Hand-held Instruments
• PCMCIA Cards

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

Verify the specific package type matches the design requirements, as the K suffix indicates SOT-23-5 packaging. Confirm that the fixed 1.8V output aligns with the target circuit's voltage rails. Ensure compliance with RoHS and Halogen-free standards if required by the manufacturing environment. Check for any recent product change notifications regarding component revisions or sourcing updates.

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

Select this component when a fixed 1.8V rail is required with moderate current demands up to 300mA. The SOT-23-5 package provides an additional enable pin compared to the three-pin variant, allowing for system-level power management. Consider the low noise characteristics for sensitive analog sections in portable devices where battery life and signal integrity are critical constraints.

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

This part belongs to the AP2125 series of high-speed, extremely low noise CMOS LDO regulators manufactured by Diodes Incorporated. The series offers multiple fixed voltage options including 2.5V, 2.8V, 3.0V, 3.3V, 4.15V, and 4.2V. The K suffix specifically denotes the SOT-23-5 package configuration, distinguishing it from the N (SOT-23-3) and KS (SC-70-5) variants within the same functional family.

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

AP2125N-1.8TRG1: Pin-compatible alternative in SOT-23-3 package without the enable pin. AP2125KS-1.8TRG1: Alternative in SC-70-5 package.