Diodes Incorporated AP7361C-28SP-13

Overview

AP7361C-28SP-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 250mV typical), and 60µA quiescent current-enabling use in battery-powered audio/video devices and LCD-TVs where stable low-voltage biasing is critical.

For engineers reviewing the AP7361C-28SP-13 datasheet, AP7361C-28SP-13 pinout, AP7361C-28SP-13 application, or AP7361C-28SP-13 equivalent, key selection criteria include dropout voltage at 2.8V output, SO-8EP thermal performance (θJA = 100°C/W), EN logic thresholds (VIH = 1.0V min), and compatibility with ≥2.2µF MLCC output capacitors without external compensation.

Technical Context

The AP7361C-28SP-13 integrates a PMOS pass element, band-gap reference, error amplifier, and fold-back current limiting. Its fixed 2.8V output is internally trimmed; no external resistor divider is required. The EN pin enables direct microcontroller-level control with 1.0V minimum high threshold and 0.3V maximum low threshold.

Thermal shutdown activates at 150°C with 20°C hysteresis, and short-circuit protection limits output to 400mA during fault conditions. PSRR reaches 75dB at 1kHz, supporting noise-sensitive analog rails in set-top boxes and home appliances.

Key Specifications

Pinout & Package

AP7361C-28SP-13 is housed in an SO-8EP package with exposed thermal pad (pin 8), optimized for thermal dissipation in compact layouts. The package supports 1190mW power dissipation and requires soldering of the thermal pad to a dedicated copper plane for reliable operation at full load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/MB and TLS850F2BTV50, AP7361C-28SP-13 uniquely balances 1A output, SO-8EP thermal capability, and consumer-grade cost-making it optimal for high-volume display and STB designs where automotive qualification and ultra-small footprint are not required.

Availability

AP7361C-28SP-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top-box audio subsystems, and home appliance control panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361C-28SP-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 for power management, signal integrity, and connectivity applications.

The AP7361C belongs to Diodes' high-performance LDO family targeting consumer and industrial power rails, emphasizing ultra-low dropout, low IQ, and robust fault protection for battery- and adapter-powered devices.

FAQ

What is the minimum input voltage required for AP7361C-28SP-13 to maintain regulation at 1A load?

The minimum input voltage is calculated as VOUT + VDROPOUT = 2.8V + 0.25V = 3.05V. At 1A load and 25°C, the device sustains regulation down to 3.05V input; below this, output voltage drops nonlinearly per the 2% dropout definition in the datasheet. Input must remain ≥2.2V for basic functionality, but regulation fails below 3.05V under full load.

Can AP7361C-28SP-13 be used without connecting the EN pin?

Yes-the EN pin has an internal 3.0MΩ pull-down resistor, so leaving it unconnected defaults the device to OFF. To enable operation, EN must be actively driven high (≥1.0V) or tied directly to the IN pin. Floating EN is not recommended due to susceptibility to noise-induced toggling in high-EMI environments.

Is the SO-8EP thermal pad required to be soldered for functional operation?

Yes-thermal pad soldering is mandatory for rated 1A operation. Without soldering the pad to a thermal plane, junction temperature rises rapidly under load, triggering thermal shutdown at ~300mW dissipation. The datasheet specifies θJA = 100°C/W only when the pad is properly connected to ≥1cm² copper with thermal vias.

Does AP7361C-28SP-13 require an output capacitor, and what type is recommended?

Yes-a minimum 2.2µF ceramic capacitor is required between OUT and GND for stability. X5R or X7R dielectrics are recommended; tantalum or aluminum electrolytics are not supported. Larger values (e.g., 4.7µF) improve load transient response but do not affect stability margins.