Diodes Incorporated AP2115R5A-2.5TRG1

Overview

AP2115R5A-2.5TRG1 from BCD Semiconductor is a 2.5V fixed-output, 1A CMOS low-dropout linear regulator with enable control, designed for stable local power regulation in noise-sensitive analog and mixed-signal circuits. It delivers ±1.5% output accuracy, 450mV typical dropout at 1A, 30µVRMS output noise, and operates across –40°C to +85°C. Used in LCD monitor power rails where low noise and fast startup (20µs) are critical.

For engineers reviewing the AP2115R5A-2.5TRG1 datasheet, AP2115R5A-2.5TRG1 pinout, AP2115R5A-2.5TRG1 application, or AP2115R5A-2.5TRG1 equivalent, key selection criteria include dropout voltage under full load, PSRR at 1kHz, thermal shutdown threshold, EN logic thresholds, and compatibility with 4.7µF ceramic output capacitors.

Technical Context

The AP2115R5A-2.5TRG1 implements a CMOS-based LDO architecture with internal P-channel pass transistor, enabling low quiescent current (60µA) and high PSRR (65dB @ 1kHz). Its enable input supports active-high logic control with VIH = 1.5V and VIL = 0.4V, and integrates fold-back short-circuit protection (50mA limit) and thermal shutdown (160°C with 25°C hysteresis).

It is optimized for stability with 4.7µF ceramic, tantalum, or aluminum electrolytic output capacitors and maintains ±30ppm/°C output voltage temperature coefficient over –40°C to +85°C ambient. Line regulation is 0.02%/V typical, and load regulation is 0.2%/A from 1mA to 1A.

Key Specifications

Pinout & Package

SOT-89-5 package (5-pin, surface-mount, thermally enhanced), with exposed pad for improved heat dissipation (θJC = 47°C/W). Pin 1 = VOUT, Pin 2 = VIN, Pin 3 = NC, Pin 4 = GND, Pin 5 = EN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and XC6219B252MR-G, the AP2115R5A-2.5TRG1 uniquely combines 1A output, SOT-89-5 thermal performance, and 30µVRMS noise-making it the only viable choice for industrial LCD power rails requiring simultaneous high current, low noise, and wide temperature operation.

Availability

AP2115R5A-2.5TRG1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, LCD TV timing controllers, set-top box video subsystems, and industrial HMI display modules requiring stable component supply with RoHS-compliant green packaging.

Supply support for AP2115R5A-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-reliability, cost-optimized power management solutions for consumer and industrial markets.

The AP2115 product line targets noise-sensitive local regulation in display electronics, emphasizing low dropout, low quiescent current, and capacitor flexibility across SOIC-8 and SOT-89-5 packages.

FAQ

What is the minimum input voltage required for AP2115R5A-2.5TRG1 to maintain regulation at 1A load?

The recommended minimum input voltage is 3.0V, derived from the 2.5V output plus 450mV typical dropout voltage. Absolute minimum VIN per datasheet is 2.5V, but operation below 3.0V risks dropout under full 1A load or elevated temperature, where dropout increases to 750mV max. For robust design, maintain VIN ≥ 3.0V.

Can AP2115R5A-2.5TRG1 operate with a 1µF ceramic output capacitor?

No. The datasheet specifies stability with ≥4.7µF ceramic, tantalum, or aluminum electrolytic capacitors. Using 1µF violates the minimum capacitance requirement and may cause oscillation or poor transient response. The 4.7µF value ensures phase margin >45° and damping of output impedance peaks.

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

No. The EN pin integrates a 3.0MΩ internal pull-down resistor, ensuring the device remains disabled when left floating. An external resistor is unnecessary unless specific noise immunity or faster discharge is required-e.g., in high-EMI environments where leakage currents could inadvertently raise EN above 0.4V.

How does thermal shutdown behave during sustained overload?

Thermal shutdown activates at 160°C junction temperature with 25°C hysteresis, forcing output disable until junction cools to ≤135°C. During sustained overload, the device cycles between regulation and shutdown-this is intentional fold-back behavior. To prevent cycling, ensure θJA ≤ 60°C/W with adequate copper area and airflow per the SOT-89-5 thermal guidelines.