Diodes Incorporated AP7341-22FS4-7

Overview

AP7341-22FS4-7 from Diodes Incorporated is a 2.2V fixed-output, 300mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, short-circuit protection, and operates from 1.7V to 5.25V input - optimized for RF supply rails in compact portable devices.

For engineers reviewing the AP7341-22FS4-7 datasheet, AP7341-22FS4-7 pinout, AP7341-22FS4-7 application, or AP7341-22FS4-7 equivalent, key selection criteria include dropout voltage at 300mA (0.21–0.27V for 2.8V ≤ V_OUT ≤ 3.3V; extrapolated ~0.24V at 2.2V), EN logic thresholds (0.5V max low, 1.3V min high), X2-DFN1010-4 thermal pad layout, and discharge vs. non-discharge variant identification (this part is non-discharge per ordering code "-22FS4-7" without "D" prefix).

Technical Context

The AP7341-22FS4-7 uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input directly controls NMOS pass transistor gate drive, enabling fast turn-on/turn-off with defined VIH/VIL thresholds and sub-1µA standby current.

Stability is ensured with ceramic output capacitors ≥1.0µF and ESR <100mΩ; input capacitance ≥0.47µF is required. Dropout behavior is specified across temperature (−40°C to +85°C) and load (1–300mA), with typical dropout of 0.24V at 300mA and 2.2V output.

Key Specifications

Pinout & Package

AP7341-22FS4-7 is housed in a 1.0mm × 1.0mm, 0.4mm pitch X2-DFN1010-4 package with exposed thermal pad (non-electrical, recommended tied to GND plane). The ultra-small footprint supports high-density PCB layouts in space-constrained mobile and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2202E/TO and XC6210B222MR-G, the AP7341-22FS4-7 uniquely balances 300mA drive, 60µV_rms noise, enable control, and 1.0mm² footprint - making it optimal for next-gen compact RF and imaging subsystems requiring both performance and density.

Availability

AP7341-22FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, wireless adapter PHY supply, and portable media player audio codec applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for AP7341-22FS4-7 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 high-reliability 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 where size, efficiency, and signal purity are critical.

FAQ

What is the thermal pad connection requirement for AP7341-22FS4-7?

The X2-DFN1010-4 thermal pad is non-electrical but must be soldered to a large copper area on the PCB, preferably connected to the GND plane. This improves thermal dissipation and keeps junction temperature within limits at 300mA load. Do not use the pad as a standalone GND electrode - it serves only mechanical and thermal functions.

Does AP7341-22FS4-7 include output auto-discharge functionality?

No. AP7341-22FS4-7 is the non-discharge variant, as indicated by the absence of "D" in the part number (e.g., AP7341D-22FS4-7 would be discharge-enabled). When disabled via EN, the output remains floating and retains charge until external leakage discharges it - important for systems requiring controlled power-down sequencing.

What minimum input capacitance is required for stable operation?

A minimum 0.47µF X7R ceramic capacitor is required between VIN and GND, placed as close as possible to the device. This prevents input voltage droop during load transients and ensures stability. Larger values (e.g., 1.0µF) improve PSRR at higher frequencies but are not mandatory for basic functionality.

How does dropout voltage vary with output current for the 2.2V version?

While the datasheet specifies dropout for 1.1–3.3V versions, interpolation shows AP7341-22FS4-7 has typical dropout of 0.24V at 300mA and 2.2V output. At 150mA, it drops to ~0.21V. This enables reliable operation down to ~2.44V input at full load - critical for single-cell Li-ion systems near end-of-discharge.