Diodes Incorporated AP7366-28W5-7

Overview

AP7366-28W5-7 from Diodes Incorporated is a fixed-output 2.8V, 600mA low-dropout linear regulator in SOT25 package, featuring 60μA quiescent current, 300mV dropout at full load, 75dB PSRR at 1kHz, and integrated enable control, thermal shutdown, and current limiting-designed for power management in portable battery-powered systems.

For engineers reviewing the AP7366-28W5-7 datasheet, AP7366-28W5-7 pinout, AP7366-28W5-7 application, or AP7366-28W5-7 equivalent, key selection considerations include output voltage accuracy (±1% for 2.8V), fast 150μs startup, stability with 1μF ceramic output capacitor, and compatibility with low-ESR capacitors in space-constrained designs.

Technical Context

The AP7366-28W5-7 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR without requiring external compensation. Its internal 0.8V bandgap reference and error amplifier regulate output precisely across input voltages from 2.2V to 6V.

Enable logic operates with VIH ≥ 1.0V and VIL ≤ 0.3V, supporting direct connection to 1.8V/3.3V GPIOs. Thermal shutdown activates at +150°C with +20°C hysteresis, and short-circuit protection limits output current to ~250mA when OUT is grounded.

Key Specifications

Pinout & Package

SOT25 (5-pin) package with exposed pad for thermal enhancement; footprint compatible with JEDEC MO-203AA standard; recommended pad layout includes 1.6mm × 0.8mm thermal pad connected to GND plane via ≥4 vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and TLS850F28TAV50, the AP7366-28W5-7 uniquely balances 600mA capability, 60μA I_Q, EN control, and SOT25 compactness-making it optimal for industrial and portable designs needing robust sequencing and thermal margin without automotive overhead.

Availability

AP7366-28W5-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, FPGA I/O power, and USB-C peripheral rails requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7366-28W5-7 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, with design centers across Asia, Europe, and North America.

The AP7366 series belongs to Diodes' precision LDO portfolio, engineered specifically for battery-powered and space-constrained applications demanding ultra-low quiescent current, fast transient response, and robust protection features.

FAQ

What is the minimum input voltage required for AP7366-28W5-7 to maintain regulation at 600mA?

The minimum input voltage is calculated as V_OUT + V_DROPOUT = 2.8V + 0.3V = 3.1V. At 600mA load and +25°C, the dropout is guaranteed ≤300mV per datasheet Table 1, so regulation is maintained down to 3.1V input. Below this, output voltage drops linearly with input.

Can AP7366-28W5-7 operate without an output capacitor?

No. The device requires a minimum 1μF ceramic output capacitor connected between OUT and GND for stability, as confirmed in the Application Information section. Omitting it causes oscillation and potential damage. The capacitor must be placed within 2mm of the OUT and GND pins.

Is the NC pin on AP7366-28W5-7 electrically isolated or should it be grounded?

Pin 4 is designated NC (No Connection) and is internally unconnected. Per Diodes' layout guidance, it must remain floating-neither tied to GND nor routed-to avoid parasitic coupling or thermal stress. Grounding it may compromise ESD performance or thermal resistance.

How does thermal shutdown behave under sustained overload conditions?

When junction temperature reaches +150°C, the regulator disables output and enters thermal shutdown. It remains off until temperature falls to ~+130°C (20°C hysteresis), then resumes regulation. Under continuous overload, this causes cycling-visible as intermittent output-preventing permanent damage but indicating inadequate heatsinking or excessive power dissipation.