Diodes Incorporated AP2115R5-2.5TRG1

Overview

AP2115R5-2.5TRG1 from BCD Semiconductor is a 2.5V 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 for noise-sensitive analog circuitry in LCD monitors and set-top boxes.

For engineers reviewing the AP2115R5-2.5TRG1 datasheet, AP2115R5-2.5TRG1 pinout, AP2115R5-2.5TRG1 application, or AP2115R5-2.5TRG1 equivalent, key selection criteria include dropout voltage under full load, PSRR at 1kHz, thermal shutdown behavior, and compatibility with 4.7µF ceramic output capacitors.

Technical Context

The AP2115R5-2.5TRG1 integrates a PMOS pass transistor, precision bandgap reference, error amplifier, and enable logic to regulate output from 3.5V–6.0V input while maintaining 2.5V ±1.5% across temperature and load. Its fold-back short-circuit protection limits current to 50mA during fault conditions.

Designed for low-noise operation, it achieves 65dB PSRR at 1kHz and 30µV_RMS integrated noise (10Hz–100kHz) without requiring external bypass capacitors. Thermal shutdown activates at 160°C with 25°C hysteresis, and quiescent current remains at 60µA over -40°C to 85°C ambient.

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 cost-sensitive, thermally constrained consumer applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and TPS7A2025PDQNR, AP2115R5-2.5TRG1 uniquely balances 1A output, SOT-89-5 footprint, 450mV dropout, and 30µV_RMS noise-making it the only viable choice for cost-sensitive, thermally constrained 2.5V/1A consumer power rails requiring enable control.

Availability

AP2115R5-2.5TRG1 is available at Aetrix Electronics and suitable for LCD monitor power rails, set-top box core logic, and smart TV audio subsystems requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for AP2115R5-2.5TRG1 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 Shanghai-based analog and power IC designer specializing in high-performance, cost-optimized semiconductor solutions for consumer, computing, and industrial markets.

The AP2115 product line targets low-noise, high-current LDO regulation in mainstream consumer electronics-designed specifically for LCD TVs, monitors, and STBs where 1A output, SOT-89-5 thermal performance, and ±1.5% accuracy are critical.

FAQ

What is the minimum input voltage required for AP2115R5-2.5TRG1 to maintain regulation at 1A load?

The AP2115R5-2.5TRG1 requires VIN ≥ 2.95V to sustain 2.5V output at 1A, based on its 450mV typical dropout voltage. The datasheet specifies a recommended operating range of 3.5V–6.0V for full performance, but regulation is guaranteed down to VIN = VOUT + VDROP(max) = 2.5V + 0.75V = 3.25V across temperature and process variation.

Can AP2115R5-2.5TRG1 be used with aluminum electrolytic output capacitors?

Yes-the AP2115R5-2.5TRG1 is explicitly characterized for stability with 4.7µF aluminum electrolytic, tantalum, and ceramic capacitors. Unlike many LDOs requiring specific ESR ranges, it uses an internal compensation scheme that eliminates external capacitor ESR dependency, simplifying design and enabling mixed-capacitor use.

How does the EN pin behave during power-up, and what pull-up is required?

The EN pin has an internal 3.0MΩ pull-down resistor, so it defaults to OFF (high-impedance shutdown) if left floating. To ensure reliable startup, connect EN to VIN through a resistor ≤100kΩ or drive it actively high (>1.5V). No external pull-up is mandatory, but one is recommended for deterministic behavior in noisy environments.

Is thermal derating required for continuous 1A operation in SOT-89-5 package?

Yes-thermal derating is necessary. With θ_JC = 47°C/W and T_J(MAX) = 150°C, sustained 1A operation at 85°C ambient requires ≥25°C/W PCB copper thermal relief (e.g., 200mm² 2oz copper pad with 4 thermal vias). Derated output current drops to ~750mA at 85°C ambient without enhanced heatsinking.