Diodes Incorporated AP7361C-28D-13

Overview

AP7361C-28D-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 and battery-sensitive 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 current limiting (1.5A). It powers core logic rails in LCD-TVs and set-top boxes.

For engineers reviewing the AP7361C-28D-13 datasheet, AP7361C-28D-13 pinout, AP7361C-28D-13 application, or AP7361C-28D-13 equivalent, key selection criteria include dropout voltage at 2.8V output, EN pin logic thresholds (VIH = 1.0V min), stability with ≥2.2µF MLCC, thermal resistance of TO252 package (95°C/W), and compatibility with no-load operation.

Technical Context

The AP7361C-28D-13 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output via feedback-fixed versions like this one bypass ADJ using internal resistor networks.

Enable control is active-high with VIH ≥ 1.0V and VIL ≤ 0.3V; EN is functional in TO252 (DPAK) per datasheet Pin Descriptions table. Protection includes fold-back current limiting (400mA short-circuit clamp), thermal shutdown at 150°C with 20°C hysteresis, and built-in current limit at 1.5A.

Key Specifications

Pinout & Package

AP7361C-28D-13 uses the TO252 (DPAK) package with exposed thermal pad, offering 95°C/W junction-to-ambient thermal resistance under standard PCB layout (2 oz copper, minimum pad). Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT - no EN or ADJ pins are bonded out in this DPAK variant per datasheet Pin Assignments and Application Information ("ON/OFF Input Operation" note).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7361C-28D-13, AP7362C-28D-13 offers headroom for current growth but increases thermal design complexity, while MCP1826-2802E/DB sacrifices 60µA IQ savings and fold-back safety for vendor consolidation - making the AP7361C optimal for cost-, size-, and reliability-sensitive 1A applications.

Availability

AP7361C-28D-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top box core logic supply, and home appliance display controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361C-28D-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and protection devices.

The AP7361C belongs to Diodes' high-performance LDO regulator product line, engineered for low-noise, low-dropout power delivery in consumer electronics, computing peripherals, and industrial human-machine interfaces.

FAQ

Is the EN pin functional in the TO252 (DPAK) package of AP7361C-28D-13?

No. Per the datasheet's "ON/OFF Input Operation" section and Pin Descriptions table, the EN pin is not bonded out in SOT223 and TO252 (DPAK) packages. AP7361C-28D-13 has only three active terminals: IN, GND, and OUT. Enable functionality is unavailable in this variant.

What is the minimum output capacitance required for stability with AP7361C-28D-13?

The minimum stable output capacitance is 2.2µF ceramic (MLCC), as specified in the "Output Capacitor" section. Lower values risk instability and oscillation; higher values improve transient response but do not harm stability. Tantalum or polymer capacitors may be used if their ESR falls within the safe region shown in Figure 13 of the datasheet.

Can AP7361C-28D-13 operate without any load connected to the output?

Yes. The device maintains regulation with zero load current, as confirmed in the "No Load Stability" section. Unlike some older LDOs, it does not require a minimum load resistor to remain stable - simplifying designs for intermittent or ultra-low-power operation.

What thermal considerations apply to AP7361C-28D-13 in TO252 package?

With θJA = 95°C/W, power dissipation PD = (VIN − 2.8V) × IOUT must stay below thermal limits. At VIN = 4.0V and IOUT = 1A, PD = 1.2W → ΔT = 114°C rise above ambient. A 2 oz copper thermal pad with vias to inner ground planes is mandatory; exceeding TJ = 150°C triggers shutdown. Derate output current above +60°C ambient.