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

Diodes Incorporated AP7348D-1818RS4-7

Name: AP7348D-1818RS4-7
Brand: Diodes Incorporated
SKU: AP7348D-1818RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7348D-1818RS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7348D-1818RS4-7.pdf

Description:: LDO CMOS LOWCURR X1-DFN1612-8 T&

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Product details

Overview

AP7348D-1818RS4-7 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 outputs on all four channels and is designed for noise-sensitive RF and digital supply rails in compact portable electronics.

For engineers reviewing the AP7348D-1818RS4-7 datasheet, AP7348D-1818RS4-7 pinout, AP7348D-1818RS4-7 application, or AP7348D-1818RS4-7 equivalent, this device supports simultaneous dual-rail enable sequencing, thermal shutdown per channel, foldback current limiting, and auto-discharge functionality - critical for power integrity in multi-rail IoT sensor nodes and camera modules.

Technical Context

The AP7348D-1818RS4-7 integrates two independent voltage references and four CMOS-based LDO channels, each with dedicated error amplifiers, discharge circuits, and resistor networks to fix output at 1.8V. Over-temperature protection triggers individual channel disablement when junction temperature exceeds +155°C, with +25°C hysteresis.

It operates across a 1.7V–5.25V input range and maintains regulation down to 250mV dropout (at 300mA, VOUT = 3.0V). Each channel delivers up to 300mA while maintaining 60µV_rms noise and 75dB ripple rejection - enabling clean biasing of RF transceivers and high-speed ADCs without external filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8V per channel - eliminates external feedback resistors and ensures consistent rail matching across four domains.
Max Output Current	300mA per channel - supports simultaneous powering of multiple low-power ICs (e.g., Wi-Fi SoC core + I/O + RF front-end + sensor interface).
Output Accuracy	±1% at +25°C - guarantees stable operation of 1.8V-tolerant logic (e.g., MIPI D-PHY, LPDDR2 I/O) without margining overhead.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding the same PCB plane.
Output Noise	60µV_rms (10Hz–100kHz) - meets stringent noise floor requirements for RF synthesizers and precision analog front-ends.
Quiescent Current	160µA total (all channels enabled) - enables always-on subsystems in battery-powered edge devices with sub-µA sleep leakage.
Dropout Voltage	280mV typical at 300mA (VOUT = 2.0V) - allows operation from single-cell Li-ion (3.0V min) or buck converter outputs down to 2.08V.

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm, 0.4mm pitch, thermally enhanced with exposed thermal pad (electrically isolated or grounded).

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Power Ground Reference	Primary return path for all four channels; must connect to low-impedance ground plane to maintain PSRR and stability.
2 VOUT3	Channel 3 Output	1.8V regulated output; shares EN1 enable control with VOUT1 and includes internal discharge FET when disabled.
3 VOUT4	Channel 4 Output	1.8V regulated output; shares EN2 enable control with VOUT2 and includes internal discharge FET when disabled.
4 EN2	Enable Input (CH2 & CH4)	Active-high logic input (1.3V–5.25V); drives both VOUT2 and VOUT4 simultaneously; 1µA max leakage ensures low standby power.
5 VOUT2	Channel 2 Output	1.8V regulated output; shares EN2 enable control with VOUT4 and includes internal discharge FET when disabled.
6 VDD	Main Power Input	Input supply for all four regulators (1.7V–5.25V); requires ≥4.7µF ceramic capacitor placed adjacent to pin for transient immunity.
7 VOUT1	Channel 1 Output	1.8V regulated output; shares EN1 enable control with VOUT3 and includes internal discharge FET when disabled.
8 EN1	Enable Input (CH1 & CH3)	Active-high logic input (1.3V–5.25V); drives both VOUT1 and VOUT3 simultaneously; enables independent power sequencing of dual rail pairs.

Key Features

Feature	Design Value
Dual independent enable inputs	EN1 controls VOUT1/VOUT3; EN2 controls VOUT2/VOUT4 - enables staggered startup/shutdown for sequencing-critical systems like camera ISPs and RF transceivers.
Per-channel thermal shutdown	Each LDO disables independently at +155°C with +25°C hysteresis - prevents system-wide failure during localized overheating (e.g., RF PA burst mode).
Integrated auto-discharge	Internal 10Ω N-channel FET discharges output capacitors when disabled - eliminates hold-up voltage that could delay MCU reset or cause latch-up in downstream logic.
Foldback current limiting	Short-circuit current clamped to ~55mA - limits power dissipation during fault conditions without requiring external current-sense circuitry.
Low-noise CMOS architecture	60µV_rms noise (10Hz–100kHz) and 75dB PSRR - eliminates need for post-regulator LC filters in sensitive analog/RF supply paths.

Applications

Smartphone Camera Module

Wi-Fi 6 IoT Gateway

Use Scenario: Powering image signal processor (ISP), CIS sensor analog/digital rails, AF motor driver, and flash LED controller within tight board space.

IC Role / Device Role / Timing Role: Quad-rail LDO providing isolated, low-noise 1.8V supplies with independent enable sequencing to meet MIPI CSI-2 timing and ESD immunity requirements.

Use Value: Eliminates cross-rail coupling and enables fast power cycling of sensor subsystems without affecting baseband or connectivity rails.

Use Scenario: Supplying 1.8V rails for Wi-Fi 6 SoC I/O, RF transceiver bias, BLE coexistence controller, and secure element in compact residential gateway.

IC Role / Device Role / Timing Role: Single-package quad-LDO replacing four discrete regulators - reduces BOM count, layout area, and supply noise coupling between RF and digital domains.

Use Value: 75dB PSRR suppresses noise from 1MHz–3MHz switching converters used elsewhere on the board, improving Wi-Fi sensitivity by ≥2dB.

LPWAN Sensor Node

Industrial Camera Interface

Use Scenario: Powering ultra-low-power microcontroller, LoRa transceiver, environmental sensors (temp/humidity/pressure), and EEPROM in battery-operated field node.

IC Role / Device Role / Timing Role: Low-quiescent-current quad-LDO delivering stable 1.8V to mixed-signal peripherals while supporting deep-sleep wake-up via EN1/EN2 pulse control.

Use Value: 160µA total IQ enables >5-year battery life (CR2032) with 10-second wake cycles, while auto-discharge prevents false wake-ups from residual VOUT charge.

Use Scenario: Providing clean 1.8V supplies to industrial-grade global shutter CMOS sensor, FPGA I/O bank, serializer IC, and lens actuator driver in factory automation camera.

IC Role / Device Role / Timing Role: High-PSRR quad-LDO ensuring jitter-free pixel clock generation and minimizing bit errors in serialized video streams (e.g., SLVS-EC).

Use Value: 60µV_rms noise and <30mV load regulation (1mA–300mA) prevent image artifacts (fixed-pattern noise, banding) under dynamic lighting conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
R1524x-1818-A	Single enable input for all channels; no per-channel thermal shutdown; 90µV_rms noise; 65dB PSRR at 1kHz	Lacks independent enable control and thermal isolation - unsuitable for systems requiring staggered rail sequencing or fault containment.	Select only if board-level sequencing is handled externally and thermal derating is managed at system level.
TCKE801BGL	Three-channel LDO (1.8V/1.8V/3.3V); no discharge FET; 100µA IQ; 70dB PSRR at 1kHz	Missing fourth 1.8V rail and auto-discharge - requires external discharge resistors and additional regulator for full quad-rail support.	Use only when third rail voltage differs and discharge can be implemented discretely without compromising size or efficiency.

Compared with R1524x-1818-A and TCKE801BGL, the AP7348D-1818RS4-7 uniquely provides dual independent enables, per-channel thermal shutdown, and integrated discharge - making it the only option among the three that supports true fault-isolated, sequenced quad-1.8V operation in space-constrained designs.

Availability

AP7348D-1818RS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, Wi-Fi 6 IoT gateways, and LPWAN sensor nodes requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP7348D-1818RS4-7 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-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7348 series belongs to Diodes' high-PSRR, low-noise LDO portfolio - engineered specifically for noise-sensitive applications in portable communications, imaging, and wireless infrastructure where rail count, footprint, and power integrity are critical.

FAQ

What is the maximum allowable power dissipation for AP7348D-1818RS4-7?

The absolute maximum power dissipation is 600mW, derived from its X1-DFN1612-8 (Type B) package thermal resistance (θ_JA = 160°C/W). Exceeding this limit activates thermal shutdown at +155°C junction temperature. To stay within safe operating area, total output current across all channels must be limited based on input-output voltage differential - e.g., at VDD = 3.3V and VOUT = 1.8V, max combined load is ~400mA before reaching 600mW.

Can EN1 and EN2 be tied together for simultaneous four-channel control?

Yes - connecting EN1 and EN2 to the same logic signal enables or disables all four channels concurrently. However, doing so forfeits independent sequencing capability and per-channel fault isolation. The device remains fully functional, but thermal faults on one channel will still disable only its associated pair (VOUT1/VOUT3 or VOUT2/VOUT4), not all four outputs.

Is an external discharge resistor required when using AP7348D-1818RS4-7?

No - the device integrates an internal 10Ω N-channel discharge FET for each output, activated automatically when the corresponding enable pin is pulled low. This eliminates the need for external resistors, saves PCB area, and ensures consistent discharge time (typically <100µs for 1µF COUT), critical for reliable reset behavior in microcontroller-based systems.

What input and output capacitor values are recommended for stable operation?

A minimum 4.7µF ceramic capacitor is required between VDD and GND; 1.0µF ceramic capacitors are recommended for each VOUT pin. All capacitors must be placed as close as possible to their respective pins, with low-impedance ground connections. For high-dynamic-load applications (e.g., burst-mode RF transmission), adding parallel bulk capacitance (e.g., 10µF tantalum) improves transient response without compromising stability.

AP7348D-1818RS4-7 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):: 1.8V, 1.8V, 1.8V, 1.8V

Voltage - Output (Max):: -

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

Current - Output:: 300mA, 300mA, 300mA, 300mA

Current - Quiescent (Iq):: 280 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Short Circuit

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-1818RS4-7 FAQ

1.How can I place an order for AP7348D-1818RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7348D-1818RS4-7 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-1818RS4-7 reliable?

The price and inventory of AP7348D-1818RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7348D-1818RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7348D-1818RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7348D-1818RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7348D-1818RS4-7?

AP7348D-1818RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7348D-1818RS4-7 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-1818RS4-7?

For technical support, including AP7348D-1818RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7348D-1818RS4-7 requirements.

6.How does Aetrix verify that AP7348D-1818RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7348D-1818RS4-7 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-1818RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7348D-1818RS4-7?

All AP7348D-1818RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7348D-1818RS4-7, 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-1818RS4-7 part is unused and in its original packaging.

Return procedure for AP7348D-1818RS4-7:

1.Submit a request within 90 days.

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

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