Diodes Incorporated AP7315-285FS4-7B

Overview

AP7315-285FS4-7B from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 2.85V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in compact portable devices.

For engineers reviewing the AP7315-285FS4-7B datasheet, AP7315-285FS4-7B pinout, AP7315-285FS4-7B application, or AP7315-285FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (max 290mV), enable threshold compatibility (EN high ≥1.3V), thermal performance in X2-DFN1010-4, and stability with 0.47µF ceramic output capacitance.

Technical Context

The AP7315-285FS4-7B employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge configuration avoids active VOUT pull-down during shutdown, preserving downstream capacitor charge.

It operates across 1.7V–5.25V input range and delivers stable 2.85V output up to 150mA load while maintaining ≤0.29V dropout (at 2.8V ≤ VOUT ≤ 3.3V). The EN pin provides precise on/off control with 0–0.5V low threshold and 1.3–5.25V high threshold, enabling direct interface with 1.8V/3.3V logic.

Key Specifications

Pinout & Package

AP7315-285FS4-7B is housed in a 1.0mm × 1.0mm, 0.4mm pitch X2-DFN1010-4 package with wettable flank leads for automated optical inspection. Thermal pad is exposed on bottom and must be connected to PCB ground plane for optimal thermal dissipation (θ_JA = 220°C/W on JEDEC High-K board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6206P282MR-G, the AP7315-285FS4-7B uniquely balances 2.85V precision, 75dB PSRR, 60µV_rms noise, and 35µA IQ in a 1.0×1.0mm DFN - making it optimal for RF and imaging subsystems where all four parameters are simultaneously critical.

Availability

AP7315-285FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier supply, camera sensor bias, wireless adapter core logic, and portable media player audio codec applications requiring stable component supply, long-term manufacturability, and RoHS-compliant green packaging.

Supply support for AP7315-285FS4-7B 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 high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7315 series belongs to Diodes' precision LDO portfolio, engineered specifically for noise-sensitive portable electronics - emphasizing low noise, high PSRR, and ultra-small footprint to meet stringent RF and imaging subsystem requirements.

FAQ

What is the maximum allowable input voltage for AP7315-285FS4-7B?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating safe operating area limits and may trigger internal protection or cause permanent damage. For 2.85V output, minimum functional VIN is 3.14V (2.85V + 290mV dropout), ensuring regulation across full load and temperature range.

Does AP7315-285FS4-7B include output discharge functionality?

No - the "-" (no suffix after voltage code) in AP7315-285FS4-7B indicates the non-discharge variant. During shutdown (EN = low), the output remains floating and retains charge on downstream capacitors. For active discharge, the part number would be AP7315D-285FS4-7B, which integrates an NMOS switch between VOUT and GND.

Can AP7315-285FS4-7B operate with ceramic output capacitors smaller than 0.47µF?

The datasheet specifies 0.47µF as the minimum recommended value for guaranteed stability and transient response. While some designs may function with 0.22µF, doing so risks instability under load step conditions or elevated temperature, especially with ESR <10mΩ. Always verify phase margin via bench testing if deviating from the recommended 0.47µF X7R/X5R ceramic.

How is thermal performance affected if the thermal pad is left unconnected?

Leaving the thermal pad (exposed copper on package underside) unconnected degrades θ_JA by >100°C/W, raising junction temperature significantly under 150mA load. At ambient 60°C, this can push T_J beyond 125°C - triggering thermal shutdown or accelerating parametric drift. Diodes recommends connecting the pad to a ≥25mm² GND copper pour using ≥4 thermal vias.