Diodes Incorporated AP2115R5-1.2TRG1

Overview

AP2115R5-1.2TRG1 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 STB applications requiring low quiescent current (60µA) and high PSRR (68dB @ 1kHz).

For engineers reviewing the AP2115R5-1.2TRG1 datasheet, AP2115R5-1.2TRG1 pinout, AP2115R5-1.2TRG1 application, or AP2115R5-1.2TRG1 equivalent, this page provides verified electrical specifications, thermal performance data, EN-controlled startup timing (20µs), and real-world load/line regulation behavior across –40°C to 85°C.

Technical Context

The AP2115R5-1.2TRG1 integrates a CMOS pass transistor with fold-back short-circuit protection (50mA limit), thermal shutdown (160°C), and internal VOUT discharge (60Ω) activated when EN is low. Its architecture supports stable operation with 4.7µF ceramic, tantalum, or aluminum electrolytic output capacitors.

It operates from 2.5V to 6.0V input, 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 at 30mA - critical for precision biasing in display pixel drivers and video signal chains.

Key Specifications

Pinout & Package

SOT-89-5 package: compact 4.6mm × 2.6mm surface-mount outline with exposed thermal pad for enhanced heat dissipation (θ_JC = 47°C/W). Pin 1 is VOUT; Pin 4 is VIN; Pin 5 is GND; Pin 3 is EN; Pin 2 is NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1202E/MB and TPS7A2012PDBVR, AP2115R5-1.2TRG1 uniquely balances 1A delivery, SOT-89-5 thermal performance, and display-grade noise/PSRR - making it the only direct fit for high-current, space-constrained LCD power rails.

Availability

AP2115R5-1.2TRG1 is available at Aetrix Electronics and suitable for LCD monitor power rails, set-top box core logic, LCD TV timing controller boards, and industrial display controllers requiring stable component supply with RoHS-compliant green packaging.

Supply support for AP2115R5-1.2TRG1 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-reliability, cost-optimized regulators, MOSFETs, and LED drivers for consumer and industrial markets.

The AP2115 series targets display and multimedia applications needing low-noise, enable-controlled LDOs with wide input range and flexible capacitor compatibility - addressing design constraints in space-limited LCD/STB PCBs.

FAQ

What is the minimum input voltage required for AP2115R5-1.2TRG1 to regulate 1.2V output at 1A?

The datasheet specifies a minimum input voltage of 2.5V for guaranteed 1A operation at 1.2V output. At 2.5V input, the 450mV typical dropout leaves 2.05V headroom - sufficient to maintain regulation even with worst-case 1.218V upper output limit and PCB trace drops. Below 2.5V, output collapses into dropout.

Can AP2115R5-1.2TRG1 be used with tantalum output capacitors?

Yes - the datasheet explicitly states stability with 4.7µF tantalum capacitors, alongside ceramic and aluminum electrolytic types. No ESR requirements or damping resistors are needed, simplifying layout and reducing component count compared to older LDOs that mandate specific ESR ranges.

How does the EN pin behave during power-up sequencing?

The EN pin has an internal 3.0MΩ pull-down resistor, ensuring the regulator remains off until a valid high logic level (>1.5V) is applied. This prevents uncontrolled turn-on during slow-rising supply ramps. Startup delay is 20µs from EN high to regulated VOUT, enabling predictable timing in multi-rail systems.

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

At 85°C ambient, the SOT-89-5's 47°C/W θ_JC yields ~47°C junction rise above ambient at 1A - well below the 150°C absolute max and 160°C thermal shutdown threshold. No derating is needed up to 85°C ambient; full 1A is supported across the full –40°C to 85°C operating range.