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

Diodes Incorporated AP7348D-2818RS4-7

Name: AP7348D-2818RS4-7
Brand: Diodes Incorporated
SKU: AP7348D-2818RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7348D-2818RS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7348D-2818RS4-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7348D-2818RS4-7 from Diodes Incorporated is a quad-channel low-dropout linear regulator IC with independent enable control for dual channel pairs, ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It delivers 300mA per channel across a 1.7V–5.25V input range and is configured for fixed 2.8V on VOUT1/VOUT2 and 1.8V on VOUT3/VOUT4 - optimized for multi-rail power in compact wireless modules.

For engineers reviewing the AP7348D-2818RS4-7 datasheet, AP7348D-2818RS4-7 pinout, AP7348D-2818RS4-7 application, or AP7348D-2818RS4-7 equivalent, this device supports simultaneous low-noise biasing of RF transceivers and baseband processors while maintaining tight regulation under fast load transients and rejecting supply ripple in space-constrained IoT endpoints.

Technical Context

The AP7348D-2818RS4-7 integrates four independent CMOS-based LDO regulators sharing two precision voltage references and separate error amplifiers, foldback current limiting, and auto-discharge circuits. Each channel features dedicated thermal shutdown sensing (trip at +155°C) and independent resistor networks setting fixed outputs.

EN1 controls VOUT1 and VOUT3 (2.8V/1.8V), while EN2 controls VOUT2 and VOUT4 (2.8V/1.8V); both enables accept logic-level inputs (0–0.5V low, 1.3–5.25V high) and drive internal N-channel discharge switches (10Ω typical) during disable to rapidly collapse output voltages.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.8V (CH1 & CH2), 1.8V (CH3 & CH4); fixed via internal resistor network - eliminates external feedback components and ensures stable rail sequencing.
Max Output Current	300mA per channel; supports concurrent operation of multiple low-power subsystems without derating below ambient +85°C.
PSRR	75dB at 1kHz; suppresses switching noise from upstream DC-DC converters feeding VDD, critical for RF front-end stability.
Output Noise	60µV_rms (10Hz–100kHz); enables clean analog/RF supply without additional filtering, reducing BOM count in camera and Wi-Fi modules.
Quiescent Current	160µA total (all channels enabled); extends battery life in always-on sensor nodes and wearable devices.
Dropout Voltage	0.26V at 300mA (for 2.8V output); allows operation from single-cell Li-ion (3.0V min) with margin for voltage sag.
Thermal Shutdown	+155°C threshold with +25°C hysteresis; prevents latch-up during sustained overload and enables safe recovery after fault clearance.

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm, 0.4mm pitch, exposed thermal pad - enables ultra-dense PCB layouts in mobile and edge-node designs.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Primary return path for all four channels; must connect to low-impedance ground plane to maintain PSRR and transient response.
2 VOUT3	Channel 3 output	Delivers fixed 1.8V to subsystems requiring lower-voltage logic or analog circuitry; includes foldback current limit and auto-discharge.
3 VOUT4	Channel 4 output	Delivers fixed 1.8V; independently regulated and thermally monitored - supports isolated power domains in mixed-signal SoC interfaces.
4 EN2	Enable for CH2 & CH4	Logic-controlled input (0–0.5V = off, 1.3–5.25V = on); pulls associated outputs to ground via 10Ω switch when disabled.
5 VOUT2	Channel 2 output	Delivers fixed 2.8V; shares enable with VOUT4 but has independent regulation loop and thermal protection.
6 VDD	Main power input	Supplies all four channels; requires ≥4.7µF ceramic decoupling capacitor placed adjacent to pin to prevent instability during load steps.
7 VOUT1	Channel 1 output	Delivers fixed 2.8V; paired with VOUT3 under EN1 control - enables synchronized power-up of core processor and I/O rails.
8 EN1	Enable for CH1 & CH3	Logic-controlled input (0–0.5V = off, 1.3–5.25V = on); activates/disables VOUT1 and VOUT3 simultaneously for coordinated rail management.

Key Features

Feature	Design Value
Independent dual-enable architecture	EN1 and EN2 allow grouped control of non-adjacent channels (CH1+CH3, CH2+CH4), enabling flexible power sequencing without external logic.
Per-channel thermal shutdown	Each output disables independently upon local overtemperature detection - preserves functionality of remaining channels during localized faults.
Low-noise CMOS design	60µV_rms noise floor and 75dB PSRR meet stringent requirements for RF synthesizers and ADC reference supplies.
Auto-discharge on disable	Integrated 10Ω N-channel switch rapidly discharges VOUT pins to GND when EN is low - prevents floating rails and ensures deterministic reset behavior.
High-accuracy fixed outputs	±1% output voltage tolerance across -40°C to +85°C ensures reliable operation of voltage-sensitive peripherals like LPDDR I/O and PLLs.

Applications

Smartphone Baseband Power

Wi-Fi 6 Module Supply

Use Scenario: Powering application processor I/O banks and memory interfaces in compact smartphone mainboards.

IC Role / Device Role / Timing Role: Quad LDO providing isolated 2.8V (I/O) and 1.8V (memory) rails with synchronized enable control via EN1/EN2.

Use Value: Eliminates need for discrete regulators and sequencing ICs while maintaining <±1% rail accuracy under dynamic load changes up to 300mA/channel.

Use Scenario: Biasing 2.4GHz/5GHz RF transceivers and baseband processors in M.2-format Wi-Fi 6 modules.

IC Role / Device Role / Timing Role: Delivers ultra-low-noise 2.8V (PA bias) and 1.8V (digital core) from shared 3.3V input with >75dB supply ripple rejection.

Use Value: Reduces conducted EMI into RF sections by 10× versus standard LDOs, improving ACPR and receiver sensitivity without added ferrite beads.

IoT Edge Sensor Hub

Camera Module Power

Use Scenario: Powering BLE SoC, environmental sensors, and secure element in battery-operated industrial gateways.

IC Role / Device Role / Timing Role: Supplies 2.8V to radio subsystem and 1.8V to sensor interface logic, with independent enable control for duty-cycled operation.

Use Value: 160µA total quiescent current extends 10-year battery life; thermal shutdown prevents field failures during extended ambient temperature excursions.

Use Scenario: Providing regulated power to image signal processor (ISP), CIS analog front-end, and MIPI interface in smartphone camera modules.

IC Role / Device Role / Timing Role: Delivers tightly regulated 2.8V (AF motor driver) and 1.8V (MIPI PHY) with fast load transient response (<50µs settling).

Use Value: Maintains <10mV output deviation during 100mA load steps - prevents image artifacts and frame drops during burst capture sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6216D2818MR-G	Single enable pin controlling all four channels; no per-pair enable; PSRR 65dB @1kHz; 80µV_rms noise.	Lacks independent EN1/EN2 control - unsuitable for systems requiring staggered rail activation or fault isolation between channel groups.	Select only if simplified enable logic suffices and 10dB lower PSRR is acceptable for non-RF applications.
Ricoh RP517K2818B	Separate enable per channel (4 EN pins); higher quiescent current (220µA); 70dB PSRR; same 60µV_rms noise.	Enables granular per-rail control but increases GPIO count and layout complexity; less optimal for space-constrained modules.	Prefer when individual channel sequencing is mandatory and board area permits extra routing for four enable lines.

Compared with XC6216D2818MR-G and RP517K2818B, the AP7348D-2818RS4-7 uniquely balances dual-group enable flexibility, industry-leading 75dB PSRR, and minimal 160µA quiescent current in a 1.6mm × 1.2mm footprint - making it optimal for RF-sensitive, size-constrained multi-rail systems.

Availability

AP7348D-2818RS4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Wi-Fi 6 module supply, and IoT edge sensor hub applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7348D-2818RS4-7 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 solutions for power management, signal integrity, and connectivity applications.

The AP7348 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for multi-rail power delivery in portable wireless and imaging systems where compact size, precision regulation, and RF immunity are critical.

FAQ

What is the maximum allowable power dissipation for AP7348D-2818RS4-7?

The absolute maximum power dissipation is 600mW, as specified in the Absolute Maximum Ratings table. Exceeding this value triggers thermal shutdown at +155°C, causing all four channels to disable until junction temperature falls by +25°C hysteresis. Designers must calculate worst-case power (V_IN–V_OUT)×I_OUT per channel and ensure θ_JA = 160°C/W with proper PCB copper area does not exceed this limit.

Can AP7348D-2818RS4-7 operate with a 1.7V input voltage while delivering 2.8V output?

No. The minimum input voltage must exceed the desired output voltage by the dropout voltage - for 2.8V output at 300mA, dropout is 0.26V (typical), so V_IN must be ≥3.06V. At 1.7V input, only the 1.8V outputs can function reliably; the 2.8V channels will drop out and fail to regulate.

Is the thermal pad electrically connected internally?

No. The exposed thermal pad is not electrically connected to any internal node. It must be soldered to a PCB thermal plane for heat dissipation but may be left floating or tied to GND externally - it does not replace the functional connection required at Pin 1 (GND).

Does AP7348D-2818RS4-7 support ceramic output capacitors?

Yes. The device is explicitly characterized and stable with low-ESR ceramic capacitors as small as 1.0µF per channel. Diodes recommends placing each C_OUT within 2mm of its respective VOUT and GND pins to minimize loop inductance and preserve PSRR above 100kHz.

AP7348D-2818RS4-7 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):: 2.8V, 2.8V, 1.8V, 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.34V @ 300mA, 0.34V @ 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-2818RS4-7 FAQ

1.How can I place an order for AP7348D-2818RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7348D-2818RS4-7 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-2818RS4-7 reliable?

The price and inventory of AP7348D-2818RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7348D-2818RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7348D-2818RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7348D-2818RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7348D-2818RS4-7?

AP7348D-2818RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7348D-2818RS4-7 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-2818RS4-7?

For technical support, including AP7348D-2818RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7348D-2818RS4-7 requirements.

6.How does Aetrix verify that AP7348D-2818RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7348D-2818RS4-7 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-2818RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7348D-2818RS4-7?

All AP7348D-2818RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7348D-2818RS4-7, 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-2818RS4-7 part is unused and in its original packaging.

Return procedure for AP7348D-2818RS4-7:

1.Submit a request within 90 days.

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

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