Diodes Incorporated AP2112K-2.5TRG1

Overview

AP2112K-2.5TRG1 from Diodes Incorporated is a fixed 2.5V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality. It delivers ±1.5% output accuracy, 250mV typical dropout at 600mA (VIN = 3.5V), and 50µVRMS output noise, targeting power rails in portable computing and display subsystems where stable low-noise biasing is critical.

For engineers reviewing the AP2112K-2.5TRG1 datasheet, AP2112K-2.5TRG1 pinout, AP2112K-2.5TRG1 application, or AP2112K-2.5TRG1 equivalent, key selection criteria include guaranteed 600mA load capability, fast transient response under line/load steps, thermal shutdown at +160°C, and compatibility with 1.0µF ceramic, tantalum, or aluminum electrolytic output capacitors.

Technical Context

The AP2112K-2.5TRG1 integrates a precision bandgap reference, error amplifier, and PMOS pass transistor in a CMOS process to achieve low quiescent current (55µA typ.) and ultra-low standby current (0.01µA typ.). Its feedback loop is internally compensated for stability with ≥1.0µF output capacitance across dielectric types.

Enable logic operates with VIH ≥1.5V and VIL ≤0.4V; when disabled, a 60Ω internal discharge path pulls VOUT to GND. Foldback current limiting activates at 50mA short-circuit current, and thermal shutdown engages at +160°C with +25°C hysteresis.

Key Specifications

Pinout & Package

SOT25 (SOT-23-5) package: compact 5-pin surface-mount outline with exposed thermal pad (not electrically connected), optimized for space-constrained PCB layouts and moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-2502E/TT and XC6206P252MR-G, the AP2112K-2.5TRG1 uniquely combines 600mA drive, integrated discharge, and full enable control in SOT25-making it the sole choice for compact, high-reliability 2.5V point-of-load regulation with active power management.

Availability

AP2112K-2.5TRG1 is available at Aetrix Electronics and suitable for portable DVD players, LCD monitor bias rails, laptop subsystems, and industrial sensor interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP2112K-2.5TRG1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP2112 series belongs to Diodes' precision LDO portfolio, engineered for applications demanding low noise, fast transient response, and robust fault protection in space- and power-constrained designs.

FAQ

What is the minimum input voltage required for AP2112K-2.5TRG1 to regulate at full 600mA?

The AP2112K-2.5TRG1 requires VIN ≥ 2.5V per Absolute Maximum Ratings, but to sustain 600mA output with specified dropout, VIN must be ≥ 2.75V (2.5V + 250mV). At VIN = 2.75V, full load regulation is maintained; below this, output drops out of specification.

Can AP2112K-2.5TRG1 operate with a 0.47µF ceramic output capacitor?

No. The datasheet explicitly specifies stability with ≥1.0µF output capacitance (ceramic, tantalum, or aluminum electrolytic). Using 0.47µF violates the minimum requirement and risks oscillation or poor transient response-designs must use 1.0µF or greater.

Is the NC pin on AP2112K-2.5TRG1 electrically isolated or internally tied?

Pin 2 is designated "NC" (No Connection) in all package variants and has no internal bond wire or circuit connection. It must remain unconnected on the PCB; routing traces or vias to it may cause mechanical stress or unintended coupling.

Does the 60Ω discharge resistor activate during normal operation or only when EN is low?

The 60Ω discharge path is active exclusively when EN is driven low (≤0.4V). During normal operation (EN ≥1.5V), the resistor is disconnected; VOUT remains regulated and isolated from GND except through the load.