Diodes Incorporated AP2111H-2.5TRG1

Overview

AP2111H-2.5TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 2.5V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality, designed for power rail regulation in space-constrained portable electronics. It delivers ±1.5% output accuracy, 250mV typical dropout at 600mA, 50μVRMS output noise, and operates across –40°C to +85°C ambient temperature.

For engineers reviewing the AP2111H-2.5TRG1 datasheet, AP2111H-2.5TRG1 pinout, AP2111H-2.5TRG1 application, or AP2111H-2.5TRG1 equivalent, key selection criteria include guaranteed 600mA load capability, fast transient response, low quiescent current (55μA), thermal shutdown protection, and compatibility with 1.0μF ceramic output capacitors.

Technical Context

The AP2111H-2.5TRG1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and PMOS pass transistor, enabling stable regulation with minimal headroom. Its enable input (EN) controls full rail shutdown with 0.01μA standby current and activates built-in VOUT discharge via 60Ω internal resistor.

It features foldback short-circuit protection (50mA limit), overtemperature shutdown at 160°C with 30°C hysteresis, and high PSRR (65dB at 100Hz/1kHz) for noise-sensitive analog and mixed-signal loads. The device is optimized for input voltages from 3.5V to 6.0V when regulating 2.5V output.

Key Specifications

Pinout & Package

SOT-223 (H package) - thermally enhanced 3-pin surface-mount package with exposed thermal pad; footprint compatible with JEDEC TO-261AA; θ_JA = 128°C/W, θ_JC = 50.9°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2502E/MB and TPS7A2025PDQNR, the AP2111H-2.5TRG1 uniquely integrates enable-controlled auto-discharge, foldback protection, and 1.0μF capacitor stability in a thermally robust SOT-223 package-making it optimal for cost-sensitive, space-constrained portable systems requiring full rail control and reliability.

Availability

AP2111H-2.5TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, portable DVD player subsystems, LCD monitor logic rails, and industrial handheld terminals requiring stable component supply with consistent parametric performance and RoHS-compliant green packaging.

Supply support for AP2111H-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

BCD Semiconductor Manufacturing Limited is a China-based fabless semiconductor company specializing in analog and power management ICs, with design centers in Shanghai and Shenzhen and manufacturing partnerships in Asia.

The AP2111 product line targets cost-effective, high-reliability LDO regulation for portable and industrial electronics, emphasizing low dropout, low noise, and integrated protection features in industry-standard packages.

FAQ

What is the minimum input voltage required for AP2111H-2.5TRG1 to maintain regulation?

The AP2111H-2.5TRG1 requires a minimum input voltage of 3.5V to sustain 2.5V output at full 600mA load, based on its 250mV typical dropout specification. At lighter loads (e.g., 10mA), dropout drops to 5–8mV, allowing operation down to ~2.505V input-but 3.5V is the validated minimum for full-rated current per datasheet test conditions.

Does AP2111H-2.5TRG1 require an external capacitor on the EN pin for noise immunity?

No external capacitor is required on the EN pin. The device specifies VIH ≥1.5V and VIL ≤0.4V with hysteresis, and internal ESD protection (4000V HBM) provides sufficient noise margin. However, routing EN away from noisy signals and using a short, direct trace to the controller GPIO is recommended for robust operation in high-noise environments.

Can AP2111H-2.5TRG1 be used with aluminum electrolytic output capacitors?

Yes-the datasheet explicitly confirms stability with 1.0μF aluminum electrolytic, tantalum, and ceramic capacitors. For aluminum types, ensure ESR is ≤100mΩ and rated for ≥6.3V to maintain phase margin and avoid oscillation, especially under temperature extremes.

Is thermal derating required for continuous 600mA operation in SOT-223 package?

At TA = 85°C, the SOT-223 package (θJA = 128°C/W) dissipates up to 0.15W (250mV × 600mA). Junction temperature rise is ~19°C, resulting in TJ ≈ 104°C - below the 150°C absolute maximum. No derating is needed for 600mA at 85°C ambient, but airflow or PCB copper area improves margin.