Diodes Incorporated AP7315D-28W5-7

Overview

AP7315D-28W5-7 from Diodes Incorporated is a 2.8V fixed-output, 150mA low-dropout linear regulator with enable control, ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input and delivers ultra-low quiescent current (35µA typ) for RF supply and portable media applications.

For engineers reviewing the AP7315D-28W5-7 datasheet, AP7315D-28W5-7 pinout, AP7315D-28W5-7 application, or AP7315D-28W5-7 equivalent, this page provides verified package mapping (SOT25), terminal functions, real-world load transient behavior, dropout voltage vs. temperature curves, and validated alternative LDOs for space-constrained battery-powered designs.

Technical Context

The AP7315D-28W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path (enabled when EN = low). Its architecture supports fast load transient response (<100µs settling) and maintains stability with 0.47µF ceramic output capacitors.

It features built-in short-circuit protection (clamp ~55mA), thermal shutdown, and an enable threshold of 1.3V (min) for reliable digital logic interfacing. The discharge function actively pulls VOUT to GND during shutdown, preventing residual voltage hold-up in multi-rail systems.

Key Specifications

Pinout & Package

SOT25 (5-pin, 2.9mm × 2.8mm × 1.3mm) package with exposed thermal pad (pin 5). Optimized for high-density PCB layouts and thermal dissipation via internal copper slug connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the AP7315D-28W5-7 uniquely combines 2.8V precision regulation, integrated discharge, 75dB PSRR, and SOT25 footprint-making it optimal for RF-sensitive, sequenced-power portable designs where board space and noise performance are critical.

Availability

AP7315D-28W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera module core supply, and wireless adapter SoC core applications requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for AP7315D-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 company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive portable electronics including smartphones, wireless modules, and imaging systems.

FAQ

What is the purpose of the NC pin (Pin 5) in the SOT25 package?

Pin 5 is a non-connected thermal pad designed for mechanical attachment and heat dissipation-not an electrical node. It must be soldered to a large GND copper area on the PCB to improve thermal resistance, but should never be used as a functional ground connection. Doing so may compromise regulator stability or ESD performance.

Does AP7315D-28W5-7 require an external output capacitor, and what type is recommended?

Yes, a minimum 0.47µF ceramic capacitor is required between VOUT and GND for stability and transient response. X5R or X7R dielectrics are recommended due to stable capacitance over voltage and temperature. Avoid high-ESR tantalum or aluminum electrolytic types, as they risk instability per the ESR vs. output current stability chart in the datasheet.

How does the active discharge feature behave during shutdown?

When EN is pulled low, the internal 30Ω NMOS switch connects VOUT to GND, discharging output capacitance within 1ms (typical). This prevents residual voltage from interfering with downstream logic states or causing latch-up in multi-rail systems. Discharge only activates when EN = low; it remains inactive during normal operation or when EN is floating (which is prohibited).

Can AP7315D-28W5-7 operate with input voltage below 2.8V?

No-it cannot regulate at VIN < VOUT + dropout. With a 2.8V output and typical dropout of 210mV at 150mA, minimum functional VIN is 3.01V. At lighter loads (e.g., 1mA), dropout drops to ~100mV, allowing operation down to ~2.9V-but guaranteed regulation starts at 3.01V. Below that, output collapses linearly with input.