Diodes Incorporated AP2115R5A-1.2TRG1

Overview

AP2115R5A-1.2TRG1 from BCD Semiconductor is a 1.2V 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 set-top boxes.

For engineers reviewing the AP2115R5A-1.2TRG1 datasheet, AP2115R5A-1.2TRG1 pinout, AP2115R5A-1.2TRG1 application, or AP2115R5A-1.2TRG1 equivalent, key selection criteria include dropout voltage under full load, PSRR at 1kHz, thermal shutdown threshold, and compatibility with 4.7µF ceramic output capacitors.

Technical Context

The AP2115R5A-1.2TRG1 integrates a PMOS pass transistor, precision bandgap reference, error amplifier, and enable-controlled bias circuitry. Its fold-back short-circuit protection limits current to 50mA during fault conditions, and thermal shutdown activates at 160°C with 25°C hysteresis.

It operates across -40°C to +85°C ambient temperature with input voltage range 2.5V–6.0V and supports stable regulation using 4.7µF ceramic, tantalum, or aluminum electrolytic output capacitors-no ESR requirement.

Key Specifications

Pinout & Package

SOT-89-5 package: thermally enhanced 5-pin surface-mount outline with exposed pad (not electrically connected), 1.1mm max height, footprint compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1202E/MB and XC6210B122MR-G, the AP2115R5A-1.2TRG1 uniquely balances 1A capability, SOT-89-5 thermal performance, and 30µV_RMS noise-making it optimal for noise-sensitive 1A applications where board area and thermal management are both critical.

Availability

AP2115R5A-1.2TRG1 is available at Aetrix Electronics and suitable for LCD monitor power rails, set-top box core logic supplies, and USB-C PD sink controller bias requiring stable component supply, RoHS-compliant green packaging, and tape-and-reel delivery.

Supply support for AP2115R5A-1.2TRG1 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 power management solutions for consumer and industrial markets.

The AP2115 product line targets low-noise, high-current LDO applications in LCD displays and digital entertainment equipment, emphasizing dropout efficiency, capacitor flexibility, and robust fault protection.

FAQ

What is the minimum input voltage required for AP2115R5A-1.2TRG1 to maintain regulation at 1A load?

The AP2115R5A-1.2TRG1 requires VIN ≥ 2.5V to sustain 1.2V output at 1A, based on its 450mV typical dropout voltage. At 1A, V_IN(min) = 1.2V + 0.45V = 1.65V, but the datasheet specifies 2.5V as absolute minimum input due to internal bias requirements and guaranteed performance across temperature. Operation below 2.5V may cause regulation loss or instability.

Can AP2115R5A-1.2TRG1 operate with a 2.2µF ceramic output capacitor?

No. The AP2115R5A-1.2TRG1 is specified and tested for 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, as confirmed by Figure 14–17 load/transient test conditions and Section 4's "Stable with 4.7µF Flexible Cap" feature statement.

Does the EN pin have an internal pull-down resistor?

Yes. The EN pin includes a 3.0MΩ internal pull-down resistor, as specified in the Electrical Characteristics table (Section 6). This ensures default-disable behavior when left unconnected, preventing unintended regulator activation during power-up sequencing.

What is the thermal resistance (θ_JA) of AP2115R5A-1.2TRG1 in standard PCB layout?

The datasheet does not specify θ_JA for the R5A variant, only θ_JC = 47°C/W for SOT-89-5. θ_JA depends entirely on PCB copper area, layer count, and thermal vias. For estimation, a 1-in² 2-oz copper pad with 4 thermal vias yields ~120°C/W; actual values must be measured per JEDEC JESD51-2 standards using the user's specific layout.