Diodes Incorporated AP7361-28FGE-7

Overview

AP7361-28FGE-7 from Diodes Incorporated is a 1A fixed-output (2.8V) ultra-low dropout linear regulator in U-DFN3030-8 package, featuring 70µA typical quiescent current, 500mV dropout at 1A load, and integrated enable control. It delivers stable power to FPGA I/O rails, portable audio subsystems, and battery-powered instrumentation where low thermal footprint and fast transient response are critical.

For engineers reviewing the AP7361-28FGE-7 datasheet, AP7361-28FGE-7 pinout, AP7361-28FGE-7 application, or AP7361-28FGE-7 equivalent, key selection criteria include dropout voltage at full load, thermal resistance (θ_JA = 70°C/W), EN logic thresholds (V_IL ≤ 0.3V, V_IH ≥ 1.0V), and ceramic capacitor stability with ≥2.2µF output capacitance.

Technical Context

The AP7361-28FGE-7 implements a PMOS pass transistor architecture with internal 0.8V bandgap reference and error amplifier, enabling fixed 2.8V output without external resistors. Its enable circuitry provides active-high logic control with ±0.1µA input leakage and 200µs typical start-up time into 30Ω load.

Thermal shutdown activates at +150°C with 20°C hysteresis, while current limiting triggers at 1.1–1.5A and short-circuit protection clamps output to 200mA. PSRR reaches 65dB at 1kHz and 45dB at 10kHz under 100mA load, supporting noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

AP7361-28FGE-7 uses the U-DFN3030-8 (3.0mm × 3.0mm, 0.5mm pitch) thermally enhanced package with exposed thermal pad. Pin 1 is OUT; pin 2 is GND; pin 3 is ADJ/NC (no connection for fixed-output variant); pin 4 is GND; pin 5 is EN; pin 6 is NC; pin 7 is NC; pin 8 is IN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP7361-28FGE-7 uniquely combines 1A current, 500mV dropout, EN control, and thermal shutdown in a thermally optimized 3×3mm DFN-making it the only suitable choice for FPGA I/O or multi-peripheral USB hub rails demanding full 1A delivery with fault protection.

Availability

AP7361-28FGE-7 is available at Aetrix Electronics and suitable for FPGA power management, portable audio subsystems, and industrial sensor node designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361-28FGE-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7361 belongs to Diodes' high-performance LDO family designed for noise-sensitive, battery-constrained systems requiring ultra-low dropout, fast transient response, and robust fault protection across consumer, industrial, and computing markets.

FAQ

What is the minimum input voltage required for AP7361-28FGE-7 to regulate 2.8V at 1A?

The minimum input voltage is calculated as V_OUT + V_DROPOUT = 2.8V + 0.5V = 3.3V. At 1A load, the device maintains regulation down to 3.3V input; below this, output voltage drops linearly with input. The absolute minimum VIN rating is 2.2V, but regulation fails below 3.3V under full load.

Can AP7361-28FGE-7 be used without an enable signal?

Yes. Tie the EN pin directly to the IN pin to maintain permanent enable. This configuration draws 70µA quiescent current continuously and disables shutdown capability. Do not leave EN floating, as leakage may cause erratic on/off behavior.

Is a minimum load required for stability with AP7361-28FGE-7?

No minimum load is required. The regulator remains stable and fully regulated from zero load to 1A, as confirmed in the datasheet's "No Load Stability" section. External resistor dividers are unnecessary for fixed-output variants.

What thermal design considerations apply to the U-DFN3030-8 package?

The U-DFN3030-8 requires a PCB thermal pad connected to a solid copper plane with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. With this layout, θ_JA = 70°C/W enables 1A operation up to +85°C ambient. Without thermal vias, power dissipation must be derated by >40% to avoid thermal shutdown.