Diodes Incorporated AP7361C-28SPR-13

Overview

AP7361C-28SPR-13 from Diodes Incorporated is a 1A fixed-output (2.8V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V variant; 2.8V dropout is 340mV typ), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and 75dB PSRR at 1kHz. It supports stable operation with ≥2.2µF MLCC output capacitors and is used in LCD-TV, set-top-box, and home appliance power supplies.

For engineers reviewing the AP7361C-28SPR-13 datasheet, AP7361C-28SPR-13 pinout, AP7361C-28SPR-13 application, or AP7361C-28SPR-13 equivalent, key selection criteria include dropout voltage at 2.8V output, EN pin logic thresholds (VIH = 1.0V min), SO-8EPR thermal resistance (100°C/W), and compatibility with low-ESR ceramic capacitors without external compensation.

Technical Context

The AP7361C-28SPR-13 implements a PMOS pass transistor architecture enabling ultra-low dropout performance and fast start-up (150µs typical). Its internal 0.8V bandgap reference feeds an error amplifier that regulates output via adjustable or fixed feedback-here factory-set to 2.8V using internal resistor divider.

It features active-high enable with 3.0MΩ internal pull-down, 0.1µA EN leakage, and robust protection: current limit (1.5A), fold-back short-circuit clamp (400mA), and thermal shutdown at 150°C with 20°C hysteresis. The SO-8EPR package includes an exposed thermal pad for enhanced heat dissipation.

Key Specifications

Pinout & Package

AP7361C-28SPR-13 is housed in SO-8EPR (exposed pad, RoHS-compliant NiPdAu finish), with thermal pad soldered to PCB ground plane for optimal junction-to-ambient heat transfer (θJA = 100°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2802E/MB and XC6210B282MR-G, AP7361C-28SPR-13 uniquely balances 1A capability, 340mV dropout, integrated protection (thermal + fold-back), and SO-8EPR thermal performance-making it optimal for industrial-grade 2.8V rails requiring reliability under variable load and ambient conditions.

Availability

AP7361C-28SPR-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top box AV rails, smart home appliance MCU cores, and USB-powered audio DACs requiring stable component supply across production lifecycles.

Supply support for AP7361C-28SPR-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.

The AP7361C belongs to Diodes' high-performance LDO family targeting consumer, industrial, and computing systems needing low-noise, low-dropout, and robust protection in compact packages.

FAQ

What is the maximum input voltage for AP7361C-28SPR-13?

The absolute maximum input voltage is 6.5V, but recommended operating range is 2.2V to 6.0V. Exceeding 6.5V risks permanent damage per Absolute Maximum Ratings. For reliable 2.8V output, VIN must remain ≥3.14V (2.8V + 340mV dropout) under full 1A load to avoid dropout-induced regulation loss.

Can AP7361C-28SPR-13 operate without an output capacitor?

No. A minimum 2.2µF ceramic capacitor is required between OUT and GND for stability and transient response. Omitting it causes oscillation or failure to regulate. Larger values (e.g., 4.7µF) improve line/load transient behavior and reduce output ripple, especially under dynamic loads like MCU core switching.

Is the EN pin internally pulled down on AP7361C-28SPR-13?

Yes. The EN pin has a 3.0MΩ internal pull-down resistor to GND, ensuring default-off state when left unconnected. To enable the regulator, drive EN to ≥1.0V (VIH min); to disable, pull EN ≤0.3V (VIL max) or leave floating (relies on pull-down). Do not tie EN directly to IN unless continuous operation is required.

Does AP7361C-28SPR-13 require a minimum load current?

No. The device remains stable and regulated with zero load current. Unlike some older LDOs, AP7361C-28SPR-13 does not require a minimum load for loop stability-enabling use in standby modes where downstream circuitry draws negligible current, such as real-time clock or sensor monitoring rails.