Diodes Incorporated AP2115R5-3.3TRG1

Overview

AP2115R5-3.3TRG1 from BCD Semiconductor is a 3.3V fixed-output, 1A CMOS low-dropout linear regulator in SOT-89-5 package with enable control, ±1.5% output accuracy, 450mV typical dropout at 1A, and 30µV_RMS output noise. It delivers stable power to noise-sensitive analog circuitry in LCD monitors and STB applications requiring low quiescent current (65µA) and high PSRR (65dB @ 1kHz).

For engineers reviewing the AP2115R5-3.3TRG1 datasheet, AP2115R5-3.3TRG1 pinout, AP2115R5-3.3TRG1 application, or AP2115R5-3.3TRG1 equivalent, this page provides verified pin functions, real-world load/line regulation performance (0.2%/A, 0.02%/V), thermal shutdown behavior (160°C), and validated alternatives for 3.3V LDO replacement in industrial and consumer power rails.

Technical Context

The AP2115R5-3.3TRG1 implements a CMOS-based LDO architecture with internal fold-back short-circuit protection (50mA limit), thermal shutdown with 25°C hysteresis, and an integrated EN pin enabling logic-controlled on/off operation (VIH ≥1.5V, VIL ≤0.4V). Its design supports stable regulation across -40°C to +85°C ambient temperature.

It operates with input voltages from 4.3V to 6.0V, maintains ±1.5% output accuracy over load (1mA–1A) and temperature (-40°C to 85°C), and achieves 0.2%/A load regulation and 0.02%/V line regulation-key for powering precision analog stages and digital core supplies where voltage drift must be minimized.

Key Specifications

Pinout & Package

SOT-89-5 package: compact 4.6mm × 2.6mm surface-mount outline with exposed thermal pad (θ_JC = 47°C/W), optimized for moderate-power LDO applications with limited PCB area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3.3V LDO regulator applications.

Compared with MCP1700T-3302E/TT and TPS7A2033PDBVR, the AP2115R5-3.3TRG1 uniquely combines 1A output, integrated thermal hysteresis, and 30µV_RMS noise in a single SOT-89-5 package-making it the only drop-in solution for thermally constrained 3.3V power rails demanding both high current and low noise.

Availability

AP2115R5-3.3TRG1 is available at Aetrix Electronics and suitable for LCD monitor power rails, set-top box core logic supplies, and industrial HMI controllers requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for AP2115R5-3.3TRG1 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 IC designer and foundry partner specializing in high-performance power management, LED drivers, and mixed-signal solutions for consumer and industrial markets.

The AP2115 series targets cost-sensitive, high-volume applications requiring robust LDO performance-including LCD TVs, STBs, and digital signage-where low noise, thermal resilience, and flexible capacitor compatibility are essential.

FAQ

What is the minimum input voltage required for AP2115R5-3.3TRG1 to maintain regulation at 1A load?

The AP2115R5-3.3TRG1 requires a minimum input voltage of 4.3V to sustain 3.3V output at 1A load, based on its 450mV typical dropout voltage. Operation below 4.3V risks dropout and output collapse, especially at elevated temperatures where dropout increases to 750mV maximum.

Can AP2115R5-3.3TRG1 operate without an external output capacitor?

No. The AP2115R5-3.3TRG1 requires a minimum 4.7µF output capacitor (ceramic, tantalum, or aluminum electrolytic) for stability, as confirmed in the datasheet's Typical Application and Electrical Characteristics sections. Omitting it causes oscillation and potential damage under load transients.

Is the EN pin internally pulled down when left unconnected?

Yes. The EN pin features a 3.0MΩ internal pull-down resistor, ensuring the regulator remains disabled (shutdown mode) when the pin is floating or driven by an open-drain source without external pull-up. This prevents unintended power-on during system reset sequences.

Does AP2115R5-3.3TRG1 support reverse-voltage protection on the VOUT pin?

No. The AP2115R5-3.3TRG1 lacks reverse-voltage protection; applying voltage to VOUT while VIN is 0V can cause reverse current flow through internal parasitic paths, potentially damaging the device. External diode protection is required in systems with back-driving risk.