Diodes Incorporated AP7341D-28FS4-7

Overview

AP7341D-28FS4-7 from Diodes Incorporated is a 300mA, 2.8V fixed-output low-dropout (LDO) regulator in X2-DFN1010-4 package, featuring ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_RMS output noise (10Hz–100kHz), and 35µA quiescent current. It integrates enable control, short-circuit protection, and thermal shutdown, and is optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7341D-28FS4-7 datasheet, AP7341D-28FS4-7 pinout, AP7341D-28FS4-7 application, or AP7341D-28FS4-7 equivalent, key selection criteria include dropout voltage at 300mA (≤270mV @ V_OUT=2.8V), EN logic thresholds (V_IL ≤0.5V, V_IH ≥1.3V), thermal pad grounding guidance, and compatibility with 1µF ceramic C_IN/C_OUT.

Technical Context

The AP7341D-28FS4-7 employs a CMOS-based LDO architecture with internal voltage reference, error amplifier, and current-limit circuitry. Its enable input provides precise on/off control with <1.0µA standby current and defined logic thresholds-EN <0.5V disables regulation, EN >1.3V enables it.

Designed for high-PSRR, low-noise operation, it achieves 75dB ripple rejection at 1kHz and maintains stability with minimal 1µF ceramic output capacitance. The device includes fold-back short-circuit protection (≈55mA clamp) and thermal shutdown, with dropout voltage specified across temperature (−40°C to +85°C) and load (1mA–300mA).

Key Specifications

Pinout & Package

AP7341D-28FS4-7 uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm height) package with exposed thermal pad. PCB layout requires direct connection of the thermal pad to GND plane for optimal thermal dissipation and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6210B282MR-G, AP7341D-28FS4-7 uniquely combines 300mA capability, 60µV_RMS noise, and 1.0mm × 1.0mm thermally enhanced DFN - making it optimal for space-constrained, noise-sensitive RF and imaging applications where both current and spectral purity are critical.

Availability

AP7341D-28FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, wireless transceiver core supply, camera sensor rails, and portable media player audio codecs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7341D-28FS4-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The AP7341 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive analog and RF subsystems in battery-powered portable electronics.

FAQ

What is the minimum input voltage required for AP7341D-28FS4-7 to maintain regulation at 300mA?

The minimum input voltage is calculated as V_OUT + V_DROP = 2.8V + 0.27V = 3.07V at 300mA and 25°C. Per datasheet, dropout is guaranteed up to 0.27V across temperature and load, so 3.07V is the practical minimum for full 300mA delivery. Operation below this risks output droop or dropout.

Can the thermal pad of AP7341D-28FS4-7 be left unconnected in PCB layout?

No. The thermal pad must be connected to the PCB ground plane using multiple vias (≥4×0.3mm) to ensure adequate thermal dissipation and electrical stability. Leaving it unconnected degrades thermal resistance by >50%, increases junction temperature, and may trigger premature thermal shutdown under 300mA load.

Does AP7341D-28FS4-7 include automatic output discharge when disabled?

Yes. The "D" suffix in AP7341D-28FS4-7 denotes the discharge version: when EN is pulled low, an internal 30Ω NMOS connects VOUT to GND, discharging external capacitors rapidly. This prevents residual voltage from interfering with downstream logic sequencing or causing latch-up in powered-down sections.

Is AP7341D-28FS4-7 stable with 0.47µF ceramic output capacitance?

No. The datasheet specifies stability with ≥1.0µF ceramic output capacitance (X5R/X7R, ≤10mΩ ESR). Using 0.47µF violates the minimum C_OUT requirement and risks oscillation under transient load steps, especially above 100mA. Always use 1.0µF or higher per design guidelines.