Diodes Incorporated AP7365-39EG-13

Overview

AP7365-39EG-13 from Diodes Incorporated is a fixed-output 3.9V, 600mA low-dropout linear regulator with 35μA quiescent current, 300mV dropout at full load, and integrated enable control. It operates from 2V to 6V input, delivers ±2% output accuracy across –40°C to +85°C, and uses a SOT223-3 package with thermal pad. It powers FPGA I/O rails in notebook computers where fast transient response and low standby power are critical.

For engineers reviewing the AP7365-39EG-13 datasheet, AP7365-39EG-13 pinout, AP7365-39EG-13 application, or AP7365-39EG-13 equivalent, key selection criteria include dropout voltage at 600mA, PSRR at 1kHz, EN logic thresholds, thermal shutdown threshold, and compatibility with 1μF ceramic output capacitors.

Technical Context

The AP7365-39EG-13 implements a PMOS pass transistor architecture enabling low dropout and high PSRR (65dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output with ±2% accuracy over temperature and line/load variations.

Enable functionality uses TTL-compatible thresholds (VIH ≥ 1.4V, VIL ≤ 0.4V), and protection circuitry includes foldback current limiting (1.4A typical), short-circuit clamping (240mA), and thermal shutdown at +145°C with +15°C hysteresis.

Key Specifications

Pinout & Package

SOT223-3 package (E variant) with exposed thermal pad on underside; requires minimum 1oz copper thermal land per Diodes' recommended layout. Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN; thermal pad electrically connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and TPS7A2039PDQNR, the AP7365-39EG-13 uniquely balances 600mA capability, 3.9V output, and 35μA IQ in a thermally robust SOT223 package-making it the only drop-in solution for mid-power 3.9V applications requiring both current headroom and low standby consumption.

Availability

AP7365-39EG-13 is available at Aetrix Electronics and suitable for notebook computers, FPGA power domains, and industrial sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AP7365-39EG-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 AP7365 series belongs to Diodes' high-performance LDO portfolio designed specifically for portable and battery-powered systems demanding ultra-low IQ, fast transient response, and robust protection.

FAQ

What is the minimum input voltage required for AP7365-39EG-13 to maintain regulation at 600mA?

The AP7365-39EG-13 requires VIN ≥ VOUT + VDROPOUT = 3.9V + 0.3V = 4.2V to sustain 600mA output current while staying within specification. Below 4.2V, output voltage will droop proportionally to the deficit; the absolute minimum VIN is 2.0V, but regulation is not guaranteed below 4.2V under full load.

Can AP7365-39EG-13 operate without an external output capacitor?

No. The AP7365-39EG-13 requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability. Omitting it causes oscillation and uncontrolled voltage ripple. The capacitor must be placed within 3mm of the OUT and GND pins using short, wide traces to minimize inductance.

Is the EN pin internally pulled up or down?

The EN pin has no internal pull-up or pull-down resistor. It must be actively driven to ≥1.4V (VIH) for enable or ≤0.4V (VIL) for disable. Leaving it floating risks undefined operation; tie to IN via 100kΩ resistor if always-on function is needed.

Does AP7365-39EG-13 require a minimum load current to maintain regulation?

No. The AP7365-39EG-13 remains stable and regulated with zero load current. Its architecture does not require minimum load for loop stability, making it suitable for standby modes where downstream circuits draw microamps or disconnect entirely.