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

Diodes Incorporated AP7343-28FS4-7B

Name: AP7343-28FS4-7B
Brand: Diodes Incorporated
SKU: AP7343-28FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7343-28FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7343-28FS4-7B.pdf

Description:: IC REG LINEAR 2.8V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7343-28FS4-7B from Diodes Incorporated is a 300mA, 2.8V fixed-output low-dropout linear regulator (LDO) in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - optimized for RF supply rails in compact portable devices.

For engineers reviewing the AP7343-28FS4-7B datasheet, AP7343-28FS4-7B pinout, AP7343-28FS4-7B application, or AP7343-28FS4-7B equivalent, key selection criteria include dropout voltage (≤390mV at 300mA for V_OUT=2.8V), enable-controlled shutdown (EN input threshold: 0–0.5V low, 1.3–5.25V high), thermal shutdown at +150°C, and compatibility with 1µF ceramic input/output capacitors.

Technical Context

The AP7343-28FS4-7B implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection. Its fixed 2.8V output is set by an internal resistor network, eliminating external feedback components.

It supports wide input range (1.7V to 5.25V), delivers guaranteed 300mA output current, and maintains stability with low-ESR ceramic capacitors as small as 1µF on both input and output. The EN pin provides precise on/off control without floating-state risk.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% at +25°C; ensures stable bias for RF transceivers and camera sensors without calibration.
Max Output Current	300mA continuous; sufficient for powering baseband processors or dual-band RF front-ends in handheld devices.
Dropout Voltage	≤390mV at 300mA (V_OUT=2.8V); enables operation from single-cell Li-ion (3.0V min) with margin.
PSRR	75dB at 1kHz; suppresses switching noise from adjacent DC/DC converters feeding noisy power domains.
Output Noise	60µV_rms (10Hz–100kHz); meets low-noise requirements for analog RF sections and precision ADC references.
I_Q	35µA typical; extends battery life in always-on sensor or standby communication modules.
Enable Threshold	V_IL ≤ 0.5V, V_IH ≥ 1.3V; compatible with 1.8V/3.3V GPIOs without level-shifting.

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed thermal pad (EP) - requires PCB copper area connected to GND for optimal thermal dissipation (R_θJA = 237°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 (VOUT)	Regulated Power Output	Delivers clean 2.8V to load; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin.
2 (GND)	Ground Reference	Primary return path for load current and internal circuits; connects to EP for thermal conduction.
3 (EN)	Enable Control Input	Active-high logic input; drives regulator ON when ≥1.3V, OFF when ≤0.5V; must not float.
4 (VIN)	Unregulated Input Supply	Accepts 1.7–5.25V; requires ≥0.47µF ceramic capacitor close to pin to suppress supply transients.
EP	Exposed Thermal Pad	Not electrically functional; soldered to large GND copper pour to reduce junction temperature rise.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz enables co-location with noisy DC/DC converters without filtering overhead.
Ultra-Low Noise	60µV_rms (10Hz–100kHz) preserves signal integrity in RF receiver chains and audio codecs.
Low Quiescent Current	35µA typical allows >1-year battery life in always-on IoT sensor nodes with 200mAh cells.
Thermal Protection	+150°C shutdown with +20°C hysteresis prevents latch-up during sustained overload or poor heatsinking.
Small Footprint	X2-DFN1010-4 (1.0×1.0mm) reduces PCB area by >60% vs. SOT25, enabling ultra-dense mobile layouts.

Applications

RF Transceiver Power

Camera Sensor Bias

Use Scenario: Powering 2.4GHz/5GHz Wi-Fi/BT combo ICs in smartphones and wearables.

IC Role / Device Role / Timing Role: Provides ultra-low-noise 2.8V VDDIO rail for RF synthesizers and PA drivers.

Use Value: 75dB PSRR and 60µV_rms noise prevent EVM degradation and adjacent-channel leakage in 802.11ac/ax systems.

Use Scenario: Supplying image sensor analog core and PLL in smartphone rear cameras.

IC Role / Device Role / Timing Role: Delivers stable 2.8V bias to CIS pixel arrays and timing generators.

Use Value: ±1% accuracy and <390mV dropout ensure consistent exposure control and low fixed-pattern noise across battery discharge.

Portable Media Player Audio

Wireless Adapter Core Logic

Use Scenario: Powering DACs, headphone amplifiers, and codec analog sections in DAPs.

IC Role / Device Role / Timing Role: Low-noise 2.8V rail for audio signal chain reference and biasing.

Use Value: 60µV_rms noise contributes <0.001% THD+N, preserving dynamic range in 24-bit playback.

Use Scenario: Supplying 2.8V to USB-to-WiFi bridge controllers and flash memory interfaces.

IC Role / Device Role / Timing Role: Regulates power for high-speed serial logic (USB 2.0, SDIO) with fast load transient response.

Use Value: 300mA capability and <100µs turn-on time support burst-mode data transfers without brownout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703-2802E/MB	300mA, 2.8V, ±2% accuracy, 65dB PSRR @ 1kHz, 40µA I_Q, SOT23-5 package (2.9×1.6mm)	Larger footprint, lower PSRR, higher dropout (500mV @ 300mA) - less suitable for Li-ion headroom-constrained designs	Prefer when board space permits larger package and PSRR >70dB is not required.
Torex XC6219B282MR-G	300mA, 2.8V, ±2% accuracy, 70dB PSRR @ 1kHz, 1.5µA I_Q, SOT25 package (2.9×1.6mm)	Lower I_Q but higher dropout (450mV @ 300mA), no EN pin - lacks active control for power sequencing	Choose only for ultra-low-power always-on functions where enable control is unnecessary.

Compared with MCP1703-2802E/MB and XC6219B282MR-G, the AP7343-28FS4-7B offers superior PSRR (75dB), tighter accuracy (±1%), smaller footprint (1.0×1.0mm), and integrated enable - making it optimal for space- and noise-sensitive RF and imaging subsystems.

Availability

AP7343-28FS4-7B is available at Aetrix Electronics and suitable for RF transceiver power, camera sensor bias, and portable media player audio requiring stable component supply, full RoHS compliance, and automotive-grade traceability (via AP7343Q variant).

Supply support for AP7343-28FS4-7B 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive portable electronics where battery efficiency, small size, and RF performance are critical.

FAQ

What is the minimum input voltage required for stable 2.8V output at 300mA?

The AP7343-28FS4-7B requires VIN ≥ 3.19V (2.8V + 390mV max dropout) to maintain regulation at full 300mA load. At room temperature and typical conditions, dropout is 300mV, so 3.1V input suffices. Below 1.7V, the device ceases regulation entirely per absolute maximum ratings.

Can the EN pin be left unconnected if always-on operation is desired?

No - the EN pin must never be left floating. For permanent enable, tie EN directly to VIN. This ensures the input remains above the 1.3V high-threshold across all operating conditions, avoiding unintended shutdown due to noise or leakage.

Is an output capacitor mandatory, and what value is recommended?

Yes - a minimum 1µF ceramic capacitor is mandatory at VOUT for stability and transient response. Diodes specifies stability with X5R/X7R types; ESR should be <100mΩ. Larger values (e.g., 4.7µF) improve load-step recovery but are not required for basic operation.

Does AP7343-28FS4-7B include short-circuit protection?

Yes - it features fold-back current limiting that clamps output current to ~55mA during VOUT-to-GND short, preventing thermal runaway. Combined with +150°C thermal shutdown and +20°C hysteresis, this protects against sustained faults without external circuitry.

AP7343-28FS4-7B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-XDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7343-28FS4-7B FAQ

1.How can I place an order for AP7343-28FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343-28FS4-7B 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 AP7343-28FS4-7B reliable?

The price and inventory of AP7343-28FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343-28FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7343-28FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343-28FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343-28FS4-7B?

AP7343-28FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343-28FS4-7B 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 AP7343-28FS4-7B?

For technical support, including AP7343-28FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343-28FS4-7B requirements.

6.How does Aetrix verify that AP7343-28FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7343-28FS4-7B 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 AP7343-28FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7343-28FS4-7B?

All AP7343-28FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343-28FS4-7B, 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 AP7343-28FS4-7B part is unused and in its original packaging.

Return procedure for AP7343-28FS4-7B:

1.Submit a request within 90 days.

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

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