Diodes Incorporated AP2205-50YR-13

Overview

AP2205-50YR-13 from Diodes Incorporated is a 5.0V fixed-output, wide-input (2.3V–24V), ultra-low-dropout linear regulator in SOT89R package, delivering up to 200mA with 100mV dropout at 100µA load, 60dB PSRR at 1kHz, and ±100ppm/°C output voltage temperature coefficient-designed for USB-powered portable devices requiring stable low-noise bias under variable input conditions.

For engineers reviewing the AP2205-50YR-13 datasheet, AP2205-50YR-13 pinout, AP2205-50YR-13 application, or AP2205-50YR-13 equivalent, key selection considerations include its 2.3V minimum input compatibility with single-cell Li-ion or multi-cell alkaline supplies, thermal shutdown and reverse-current protection, and support for ceramic output capacitors as low as 2.2µF without external compensation.

Technical Context

The AP2205-50YR-13 integrates a precision 1.24V bandgap reference, error amplifier, current-limit circuit, thermal shutdown, and enable-controlled low-power shutdown mode. Its EPNP process enables operation down to 2.3V input while maintaining regulation across –40°C to +125°C junction temperature.

It features internal overcurrent and overtemperature protection, reverse-current blocking, and an EN pin that pulls output to ground when disabled. The SOT89R package includes an exposed substrate pad intended for GND connection to enhance thermal performance (θ_JA = 129°C/W).

Key Specifications

Pinout & Package

SOT89R package: 3-pin thermally enhanced variant with exposed substrate pad (pin 2) designed for GND connection to improve heat dissipation (θ_JC = 26°C/W). Compatible with standard SOT89 footprint but optimized for higher power density.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout regulator applications.

Compared with MCP1703T-5002E/MB and TLS850F5BXTMA1, the AP2205-50YR-13 delivers superior dropout performance at light loads, built-in reverse-current blocking, and optimal balance of size, cost, and protection for non-automotive portable designs-making it ideal where compactness and battery efficiency are primary constraints.

Availability

AP2205-50YR-13 is available at Aetrix Electronics and suitable for USB-powered instrumentation, industrial sensor nodes, automotive body control modules, and laptop peripheral docking stations requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP2205-50YR-13 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications-with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200.

The AP2205 series belongs to Diodes' high-voltage LDO portfolio, engineered specifically for battery-constrained and wide-input industrial/portable systems needing low-noise, low-quiescent-current regulation without external compensation.

FAQ

What is the maximum continuous output current for AP2205-50YR-13 at +85°C ambient?

At +85°C ambient with standard 2-layer FR-4 PCB and 1.5cm×1.5cm thermal pad, the AP2205-50YR-13 delivers 180mA continuously before thermal shutdown activates. This is derated from the 200mA rating at +25°C due to θ_JA = 129°C/W and power dissipation limits (P_D = (V_IN−5.0V) × I_OUT).

Can AP2205-50YR-13 operate with a 2.5V input to produce 5.0V output?

No. The AP2205-50YR-13 is a step-down LDO regulator with minimum input requirement of 2.3V, but cannot boost voltage. A 2.5V input is below the required headroom (V_IN ≥ V_OUT + V_DROP); for 5.0V output, minimum valid input is 5.1V at light load and higher under heavier loads.

Is an input capacitor required, and what value is recommended?

Yes-a 1.0µF X5R/X7R ceramic capacitor is required at VIN to ensure stability and suppress high-frequency noise. Placement within 5mm of pins 1 and 2 is critical; larger values (e.g., 4.7µF) improve surge immunity but do not affect regulation loop stability.

Does the SOT89R package require soldering the exposed pad to PCB ground?

Yes. The exposed substrate pad (pin 2) must be soldered to a dedicated GND copper pour using ≥4 thermal vias (0.3mm diameter) to achieve rated θ_JA = 129°C/W. Leaving it unconnected degrades thermal performance by >40°C/W and risks premature thermal shutdown under load.