Diodes Incorporated AP2115R5A-1.8TRG1

Overview

AP2115R5A-1.8TRG1 from BCD Semiconductor is a 1.8V fixed-output, 1A CMOS low-dropout linear regulator with enable control, ±1.5% output accuracy, 450mV typical dropout at 1A, and 30µV_RMS output noise-designed for stable power delivery in LCD monitor and STB applications requiring low-noise biasing of analog circuitry.

For engineers reviewing the AP2115R5A-1.8TRG1 datasheet, AP2115R5A-1.8TRG1 pinout, AP2115R5A-1.8TRG1 application, or AP2115R5A-1.8TRG1 equivalent, key selection criteria include guaranteed 1A load capability, SOT-89-5 package thermal resistance (47°C/W), EN logic thresholds (VIH ≥ 1.5V, VIL ≤ 0.4V), and compatibility with 4.7µF ceramic, tantalum, or aluminum electrolytic output capacitors.

Technical Context

The AP2115R5A-1.8TRG1 implements a CMOS-based LDO architecture with internal fold-back short-circuit protection (50mA limit), thermal shutdown (160°C trip, 25°C hysteresis), and OTSD protection. Its enable input supports active-high logic control with 3.0MΩ internal pull-down resistor and 60Ω VOUT discharge path when disabled.

It operates across -40°C to +85°C ambient temperature with input voltage range 2.8V–6.0V, delivering 1.8V ±1.5% output under 1mA–1A load while maintaining 0.2%/A load regulation and 0.02%/V line regulation (typ.) at 30mA. PSRR reaches 68dB at 1kHz.

Key Specifications

Pinout & Package

SOT-89-5 package (4.4mm × 4.6mm × 1.5mm) with exposed thermal pad; optimized for 47°C/W junction-to-case thermal resistance in standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2115R5A-1.8TRG1, AP2112K-1.8TRG1 trades thermal capability for wider package availability, while MCP1703T-1802E/MB sacrifices output current for lower noise-neither matches the 1A/47°C/W/SOT-89-5 combination required for high-density LCD and STB designs.

Availability

AP2115R5A-1.8TRG1 is available at Aetrix Electronics and suitable for LCD monitor power, set-top box core bias, and digital TV tuner module applications requiring stable component supply, RoHS-compliant packaging, and tape-and-reel logistics for automated assembly.

Supply support for AP2115R5A-1.8TRG1 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 Shanghai-based analog and power IC designer specializing in high-performance, cost-optimized semiconductor solutions for consumer, industrial, and computing markets.

The AP2115 product line delivers low-noise, high-current LDO regulators targeting display and multimedia applications where precision voltage regulation, thermal efficiency, and capacitor flexibility are critical design constraints.

FAQ

What is the minimum input voltage required for AP2115R5A-1.8TRG1 to maintain regulation at 1A load?

The recommended minimum input voltage is 2.8V, as specified in the datasheet's Recommended Operating Conditions. At 1A load, the 450mV typical dropout voltage means the device sustains 1.8V output down to VIN = 2.25V-but 2.8V ensures margin for line regulation, temperature drift, and transient response across the full -40°C to +85°C range.

Can AP2115R5A-1.8TRG1 operate with a 2.2µF ceramic output capacitor?

No. The datasheet explicitly specifies stability with ≥4.7µF ceramic, tantalum, or aluminum electrolytic capacitors. Using 2.2µF violates the minimum capacitance requirement and risks oscillation or poor transient response, especially under 1A load steps. Layout-dependent ESR and ESL effects further reduce margin below 4.7µF.

Does the EN pin require an external pull-up resistor?

No. The EN pin integrates a 3.0MΩ internal pull-down resistor, ensuring default-off behavior during power-up. An external pull-up is unnecessary unless system-level sequencing demands forced high-state assertion prior to VIN stabilization-such cases require verifying VIH (≥1.5V) compliance with the driving source.

Is AP2115R5A-1.8TRG1 qualified for automotive applications?

No. The device is rated for -40°C to +85°C ambient operation and lacks AEC-Q100 qualification, automotive-grade screening, or extended temperature grade (e.g., -40°C to +125°C). It is intended for commercial/industrial consumer electronics such as LCD monitors and STBs-not automotive infotainment or ADAS systems.