Diodes Incorporated AP7348D-1828RS4-7

Overview

AP7348D-1828RS4-7 from Diodes Incorporated is a quad-channel, 300mA low-dropout linear regulator with independent enable control (EN1 for VOUT1/VOUT3, EN2 for VOUT2/VOUT4), ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It delivers fixed 1.8V on Channel 1 & 3 and 2.8V on Channel 2 & 4, operating from 1.7V to 5.25V input, and is optimized for RF supply in IoT/LPWAN modules where low noise and fast transient response are critical.

For engineers reviewing the AP7348D-1828RS4-7 datasheet, AP7348D-1828RS4-7 pinout, AP7348D-1828RS4-7 application, or AP7348D-1828RS4-7 equivalent, this device supports simultaneous dual-rail power delivery with per-channel thermal shutdown, foldback current limiting, and auto-discharge-key for battery-powered communication modules requiring stable, low-noise biasing of RF transceivers and baseband ICs.

Technical Context

The AP7348D-1828RS4-7 integrates two independent CMOS-based LDO regulators per enable domain: EN1 controls two 1.8V channels (VOUT1/VOUT3), EN2 controls two 2.8V channels (VOUT2/VOUT4). Each channel features its own error amplifier, foldback current limit (~55mA short-circuit clamp), and dedicated discharge FET (R_ON = 10Ω).

Thermal protection operates per channel with independent overtemperature sensing; all four outputs disable simultaneously upon fault. Input voltage range (1.7V–5.25V), ultra-low quiescent current (160µA total), and high PSRR (75dB @ 1kHz) reflect design intent for multi-rail, space-constrained portable electronics with stringent noise and efficiency requirements.

Key Specifications

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm, 0.4mm pitch, exposed thermal pad (electrically isolated, recommended grounded for thermal performance).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel LDO applications.

Compared with XC6216D1828MR-G and RT9080L-1828GJ6F, the AP7348D-1828RS4-7 uniquely combines dual independent enables, per-channel thermal shutdown, auto-discharge, and best-in-class 60µV_rms/75dB specs-making it optimal for RF-dense, battery-constrained designs demanding precise power sequencing and noise immunity.

Availability

AP7348D-1828RS4-7 is available at Aetrix Electronics and suitable for Wi-Fi 6 IoT sensor nodes, LPWAN cellular modems, and smartphone camera modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7348D-1828RS4-7 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 devices, with emphasis on power management, signal integrity, and connectivity solutions.

The AP7348 series belongs to Diodes' high-PSRR, low-noise LDO portfolio, engineered specifically for multi-rail power delivery in portable wireless and imaging applications where noise-sensitive analog circuits coexist with digital switching loads.

FAQ

What are the exact output voltages and channel assignments for AP7348D-1828RS4-7?

AP7348D-1828RS4-7 provides fixed 1.8V on Channel 1 (VOUT1) and Channel 3 (VOUT3), controlled by EN1; and fixed 2.8V on Channel 2 (VOUT2) and Channel 4 (VOUT4), controlled by EN2. This configuration is encoded in the part number suffix "1828", where "18" denotes 1.8V for CH1/CH3 and "28" denotes 2.8V for CH2/CH4.

Does AP7348D-1828RS4-7 support independent enable for each channel, or only grouped control?

It supports grouped control only: EN1 enables or disables both VOUT1 and VOUT3 simultaneously, while EN2 enables or disables both VOUT2 and VOUT4. There is no provision for individual channel enable-this dual-enable architecture simplifies power sequencing in dual-rail SoC systems without requiring four separate control signals.

How does the thermal shutdown function, and is it per-channel or global?

Thermal shutdown is per-channel: each of the four LDOs has its own temperature sensor. If any channel exceeds +155°C, all four outputs are disabled immediately. The hysteresis is +25°C, so outputs resume only after junction temperature falls below +130°C. This prevents localized overheating from compromising other functional rails.

What is the minimum input capacitance required, and why is it critical?

A minimum 4.7µF ceramic capacitor is required between VDD and GND. This input capacitor stabilizes the supply during large load transients and prevents input droop that could trigger dropout or instability. Placement within 2mm of the VDD and GND pins is mandatory to minimize parasitic inductance and ensure effective high-frequency decoupling.