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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7348D-1218RS4-7

Name: AP7348D-1218RS4-7
Brand: Diodes Incorporated
SKU: AP7348D-1218RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7348D-1218RS4-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7348D-1218RS4-7.pdf

Description:: IC REG LINEAR 1.2V/1.8V 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,863

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Product details

Overview

AP7348D-1218RS4-7 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 1.2V on Channel 1 & 3 and 1.8V on Channel 2 & 4, operating from 1.7V to 5.25V input, and is used in multi-rail power domains of compact wireless modules.

For engineers reviewing the AP7348D-1218RS4-7 datasheet, AP7348D-1218RS4-7 pinout, AP7348D-1218RS4-7 application, or AP7348D-1218RS4-7 equivalent, key selection criteria include per-channel enable independence, thermal shutdown per channel (155°C), auto-discharge capability, low quiescent current (160µA total), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7348D-1218RS4-7 integrates two independent voltage references and four CMOS-based LDO channels, each with foldback current limiting, dedicated resistor networks for fixed output setting, and individual overtemperature sensing. All four channels shut down simultaneously during thermal fault.

Enable logic is split: EN1 controls VOUT1 and VOUT3 (1.2V), while EN2 controls VOUT2 and VOUT4 (1.8V); each enabled channel features an internal N-channel discharge switch (10Ω typical) for rapid output ramp-down. Dropout voltage ranges from 0.25V to 0.80V depending on output voltage and load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Channels	4 independent LDOs: CH1/CH3 = 1.2V, CH2/CH4 = 1.8V
Max Output Current per Channel	300mA - supports simultaneous full-load operation across all rails if thermal limits permit
Output Voltage Accuracy	±1% at +25°C - ensures stable core/logic supply under varying line/load conditions
PSRR	75dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding VDD
Output Noise	60µV_rms (10Hz–100kHz) - suitable for noise-sensitive analog/RF circuitry like camera ISPs or RF transceivers
Total Quiescent Current	160µA typical - enables always-on subsystems in battery-powered IoT endpoints
Thermal Shutdown Threshold	+155°C with +25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design

Pinout & Package

The AP7348D-1218RS4-7 is housed in the X1-DFN1612-8 (Type B) package - a 1.6mm × 1.2mm, 0.4mm pitch, thermally enhanced DFN with exposed thermal pad. The pad must be soldered for thermal dissipation but may be left electrically floating or tied to GND.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Common ground reference for all channels and internal circuitry; requires low-impedance connection to PCB ground plane
2	VOUT3	1.2V regulated output for Channel 3; supplies auxiliary logic or sensor interface rail
3	VOUT4	1.8V regulated output for Channel 4; powers I/O interfaces or low-voltage peripherals
4	EN2	Enable input controlling VOUT2 (1.8V) and VOUT4 (1.8V); high = active, low = shutdown with auto-discharge
5	VOUT2	1.8V regulated output for Channel 2; typically used for memory or communication PHY supply
6	VDD	Main input supply (1.7V–5.25V); requires 4.7µF ceramic decoupling capacitor placed adjacent to pin
7	VOUT1	1.2V regulated output for Channel 1; commonly assigned to processor core or PLL supply
8	EN1	Enable input controlling VOUT1 (1.2V) and VOUT3 (1.2V); high = active, low = shutdown with auto-discharge

Key Features

Feature	Design Value
Per-channel thermal protection	Independent OTP sensing per LDO channel prevents single-point failure from propagating across rails
Auto-discharge on disable	10Ω internal N-channel switch rapidly discharges VOUT pins when ENx is pulled low, avoiding floating or back-powering issues
Low-noise, high-PSRR architecture	75dB PSRR + 60µV_rms noise enables clean power delivery to RF front-ends and high-speed ADCs without external filtering
Split enable control	EN1/EN2 separation allows staggered power-up/down sequencing between core (1.2V) and I/O (1.8V) domains
Ultra-low quiescent current	160µA total IQ supports >1-year battery life in always-on LPWAN sensor nodes with periodic wake-up

Applications

Smartphone Baseband Power

Wi-Fi 6 Module Supply

Use Scenario: Dual-rail power for application processor (1.2V core) and Wi-Fi co-processor (1.8V I/O).

IC Role / Device Role / Timing Role: Quad-LDO provides isolated, low-noise, sequenced voltage rails with independent enable control for power domain management.

Use Value: Eliminates need for discrete enable logic and external discharge FETs; reduces BOM count by 3 components versus dual-single-LDO solution.

Use Scenario: Powering 2.4GHz/5GHz RF transceiver IC and baseband controller in compact access point module.

IC Role / Device Role / Timing Role: Delivers ultra-low-noise 1.2V for RF synthesizer PLL and 1.8V for digital baseband, rejecting switching noise from shared 3.3V buck converter.

Use Value: 60µV_rms noise and 75dB PSRR meet EVM requirements for 1024-QAM modulation without additional LC filtering.

IoT Camera Sensor Hub

LPWAN Edge Node

Use Scenario: Simultaneous regulation for image sensor analog front-end (1.2V), MIPI interface (1.8V), and ISP core (1.2V).

IC Role / Device Role / Timing Role: Provides tightly regulated, low-noise, fast-transient-response rails with per-rail enable for dynamic power gating.

Use Value: Enables <50µs wake-up time from deep-sleep via EN1/EN2 control; 300mA per channel supports burst-mode image capture.

Use Scenario: Powering sub-GHz transceiver (1.8V), microcontroller (1.2V), and environmental sensor interface (1.2V) in battery-operated NB-IoT node.

IC Role / Device Role / Timing Role: Supplies multiple low-power domains with ultra-low IQ (160µA) and fast enable/disable response for duty-cycled operation.

Use Value: Extends battery life to 10+ years at 1-minute reporting interval; thermal shutdown protects against enclosure overheating in sealed deployments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6217D1218MR-G	Single enable pin for all channels; no per-group enable; 50µV_rms noise; 70dB PSRR	Lacks independent EN1/EN2 sequencing - unsuitable for staggered power-up of core/I/O domains	Select only if unified enable suffices and lower noise/PSRR are acceptable
Richtek RT9086A-1218GJ6F	300mA per channel; ±2% accuracy; 65dB PSRR; no auto-discharge; thermal shutdown shared across channels	No discharge FET - requires external circuitry to prevent back-powering; less robust thermal fault isolation	Choose when cost sensitivity outweighs need for auto-discharge and per-channel OTP

Compared with XC6217D1218MR-G and RT9086A-1218GJ6F, the AP7348D-1218RS4-7 uniquely delivers per-group enable control, auto-discharge, and independent thermal shutdown - critical for reliable power sequencing and fault containment in space-constrained wireless systems.

Availability

AP7348D-1218RS4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Wi-Fi 6 module supply, and LPWAN edge node designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7348D-1218RS4-7 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 automotive markets.

The AP7348 belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for multi-rail, battery-powered wireless and imaging applications where compact size, low IQ, and rail-specific sequencing are essential.

FAQ

What is the maximum allowable power dissipation for AP7348D-1218RS4-7?

The absolute maximum power dissipation is 600mW, as specified in the Absolute Maximum Ratings table. Exceeding this limit triggers thermal shutdown at +155°C. Designers must calculate worst-case power per channel (P_D = (V_IN − V_OUT) × I_OUT) and ensure θ_JA (160°C/W) and PCB layout keep junction temperature below 155°C under full load and ambient extremes.

Can AP7348D-1218RS4-7 operate with only one enable pin asserted?

Yes - asserting only EN1 enables VOUT1 and VOUT3 (1.2V), while VOUT2 and VOUT4 remain off. Similarly, asserting only EN2 enables VOUT2 and VOUT4 (1.8V). This allows independent power control of core and I/O domains, enabling flexible power-state management in SoC-based systems without requiring external logic.

Is an input capacitor required, and what value is recommended?

A minimum 4.7µF ceramic input capacitor between VDD and GND is mandatory per the datasheet to prevent input voltage droop during load transients and ensure stability. It must be placed as close as possible to pins 6 (VDD) and 1 (GND), using wide copper traces. Omitting or undersizing C_IN risks instability, increased noise coupling, and degraded line transient response.

Does AP7348D-1218RS4-7 support adjustable output voltages?

No - AP7348D-1218RS4-7 is a fixed-output device with factory-set voltages: 1.2V on Channels 1 and 3, and 1.8V on Channels 2 and 4. The "D" suffix and "1218" in the part number denote this specific dual-voltage configuration. Adjustable versions (e.g., with external feedback resistors) are not offered in the AP7348 family.

AP7348D-1218RS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-XFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 4

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 1.2V, 1.2V, 1.8V, 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.8V @ 300mA, 0.8V @ 300mA, 0.48V @ 300mA, 0.48V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 280 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: X1-DFN1612-8 (Type B)

AP7348D-1218RS4-7 FAQ

1.How can I place an order for AP7348D-1218RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7348D-1218RS4-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP7348D-1218RS4-7 reliable?

The price and inventory of AP7348D-1218RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7348D-1218RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7348D-1218RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7348D-1218RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7348D-1218RS4-7?

AP7348D-1218RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7348D-1218RS4-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP7348D-1218RS4-7?

For technical support, including AP7348D-1218RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7348D-1218RS4-7 requirements.

6.How does Aetrix verify that AP7348D-1218RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7348D-1218RS4-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7348D-1218RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7348D-1218RS4-7?

All AP7348D-1218RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7348D-1218RS4-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP7348D-1218RS4-7 part is unused and in its original packaging.

Return procedure for AP7348D-1218RS4-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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