Diodes Incorporated AP7315-26FS4-7B

Overview

AP7315-26FS4-7B from Diodes Incorporated is a 2.6V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features CMOS-based architecture, enable control, and is optimized for RF supply and portable media applications requiring stable, low-noise biasing.

For engineers reviewing the AP7315-26FS4-7B datasheet, AP7315-26FS4-7B pinout, AP7315-26FS4-7B application, or AP7315-26FS4-7B equivalent, key selection criteria include dropout voltage (210mV @ 150mA), thermal performance in X2-DFN1010-4 package, EN logic thresholds (0.5V low / 1.3V high), and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7315-26FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - enabling fast load transient response (<100µs) and stable regulation across –40°C to +85°C ambient. Its non-discharge architecture avoids output discharge during shutdown, preserving downstream capacitor charge.

Designed for low-power handheld systems, it operates from 1.7V to 5.25V input, delivers 2.6V ±1% output up to 150mA, and maintains 75dB ripple rejection at 1kHz while consuming only 35µA quiescent current under light load - critical for battery longevity in portable devices.

Key Specifications

Pinout & Package

X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) exposes four terminals and a thermal pad. The package enables ultra-compact PCB layouts with minimal footprint and enhanced thermal dissipation via exposed pad connection to GND plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2602E/TO and XC6219B262MR-G, the AP7315-26FS4-7B uniquely combines 75dB PSRR, 210mV dropout, and EN control in a 1.0mm² DFN - making it optimal for space-constrained, noise-critical RF and imaging subsystems where both performance and footprint matter.

Availability

AP7315-26FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera sensor core supply, wireless adapter SoC core regulation, and portable media player audio codec powering requiring stable component supply across production lifecycles.

Supply support for AP7315-26FS4-7B 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for battery-powered portable electronics demanding precision voltage regulation with minimal power loss and electromagnetic interference.

FAQ

What is the maximum allowable input voltage for AP7315-26FS4-7B?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may trigger internal protection or degrade long-term reliability. For 5V USB-supplied designs, the 5.25V upper limit provides 250mV headroom against ripple and tolerance.

Does AP7315-26FS4-7B include output discharge functionality?

No - AP7315-26FS4-7B is the non-discharge variant (indicated by absence of "D" in part number). When disabled via EN pin, the output remains floating and retains charge on external capacitors. For active discharge, select AP7315D-26FS4-7B, which integrates a 30Ω NMOS discharge path.

Can AP7315-26FS4-7B operate with ceramic output capacitors smaller than 0.47µF?

No - the datasheet specifies 0.47µF minimum for stability across all operating conditions. Lower values risk oscillation due to insufficient phase margin, especially under load transients. Use X5R/X7R 0402 or 0603 ceramics placed within 1mm of VOUT/GND pins.

How does thermal performance differ between X2-DFN1010-4 and SOT23 packages?

X2-DFN1010-4 offers superior thermal resistance (θ_JA ≈ 220°C/W on JEDEC 2-layer board) versus SOT23 (θ_JA ≈ 280°C/W) due to its exposed thermal pad. At 150mA and 2.81V input, junction temperature rise is ~33°C in DFN vs. ~46°C in SOT23 - enabling higher ambient operation or longer continuous duty cycles.