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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Diodes Incorporated AP7368D-28RS4-7

Name: AP7368D-28RS4-7
Brand: Diodes Incorporated
SKU: AP7368D-28RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7368D-28RS4-7

Manufacturer:: Diodes Incorporated

Category:: Special Purpose Regulators

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7368D-28RS4-7.pdf

Description:: LDO CMOS HiCurr X1-DFN1612-8 T&R

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7368D-28RS4-7 from Diodes Incorporated is a 500mA/1A low-noise RF LDO regulator in X1-DFN1612-8 (Type B) package, delivering fixed 2.8V output with ±1% accuracy, 80dB PSRR at 1kHz, and 16µV_rms output noise (10Hz–100kHz). It supports dual current-limit selection (LCON pin), features enable control, thermal shutdown, and foldback short-circuit protection, and is optimized for RF supply rails in portable wireless devices.

For engineers reviewing the AP7368D-28RS4-7 datasheet, AP7368D-28RS4-7 pinout, AP7368D-28RS4-7 application, or AP7368D-28RS4-7 equivalent, key selection criteria include output noise performance, PSRR vs. frequency, dropout voltage at 1A load, LCON-configurable current limit, and thermal resistance (θ_JA = 55.5°C/W) in ultra-small DFN packaging.

Technical Context

The AP7368D-28RS4-7 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit circuitry to maintain stable 2.8V output across 1.7V–5.5V input range. Its architecture enables fast line/load transient response and supports auto-discharge via internal N-channel MOSFET (R_ON = 30Ω) when disabled.

LCON pin logic directly configures output current limit: logic high selects 1A, logic low selects 500mA with 300mA inrush limiting and 60mA foldback short-circuit current. EN pin provides precise on/off control with 0–0.4V low threshold and 1–5.5V high threshold, ensuring robust digital interface compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% over −40°C to +85°C - ensures stable RF biasing without external feedback network
Max Output Current	Selectable: 500mA (LCON=L) or 1A (LCON=H) - enables flexible power delivery for varying RF stage loads
PSRR	80dB at 1kHz (VOUT ≥ 1.8V) - suppresses switching noise from adjacent DC/DC converters feeding RF circuits
Output Noise	16µV_rms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and LNAs
Quiescent Current	110µA typical - extends battery life in always-on RF receivers and sensor nodes
Dropout Voltage	70mV at 500mA (2.8V out); 145mV at 1A (2.8V out) - enables operation from single-cell Li-ion or Li-poly batteries
Thermal Shutdown	150°C threshold with 20°C hysteresis - protects against sustained overload in compact PCB layouts

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm footprint, 0.4mm pitch, exposed thermal pad (EP) for enhanced heat dissipation. Recommended PCB layout uses large copper area connected to GND under EP.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 VOUT	Regulated output node	Dual-pin configuration reduces IR drop and improves current sharing for 1A operation
3 LCON	Current limit select input	Logic level sets output current limit: "H" = 1A, "L" = 500mA - enables dynamic power scaling
4 VFB	Feedback reference point	Internally tied to fixed 2.8V divider - no external resistors required for this variant
5 GND	Power ground reference	Low-impedance return path critical for noise suppression and stability
6 EN	Enable control input	Active-high logic: drives regulator ON/OFF; must not float - supports system-level power sequencing
7, 8 VDD	Input power supply	Dual-pin configuration lowers input impedance and improves high-frequency decoupling
EP	Exposed thermal pad	Connected to PCB GND plane for θ_JA = 55.5°C/W - essential for thermal reliability at 1A load

Key Features

Feature	Design Value
Low output noise	16µV_rms (10Hz–100kHz) - preserves signal integrity in sensitive RF front-end stages
High PSRR	80dB @ 1kHz - rejects ripple from noisy switchers powering baseband ICs
Configurable current limit	500mA/1A via LCON pin - matches load requirements without redesigning power tree
Auto-discharge function	30Ω internal N-MOSFET - rapidly discharges output capacitor on shutdown to prevent hold-up voltage issues
Thermal foldback protection	60mA short-circuit clamp (LCON=L) - prevents thermal runaway during fault conditions

Applications

Smartphone RF Front-End

Wi-Fi 6/6E Transceiver Supply

Use Scenario: Powering PA driver stages and LNA bias rails in multi-band smartphone RF modules.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO providing clean 2.8V bias to minimize AM-to-PM distortion and phase noise.

Use Value: 16µV_rms noise and 80dB PSRR directly improve EVM and ACLR performance in 5G NR uplink transmission.

Use Scenario: Supplying voltage-controlled oscillators and mixer cores in dual-band Wi-Fi 6E access point SoCs.

IC Role / Device Role / Timing Role: Stable 2.8V rail generator with fast load transient response for frequency-agile RF synthesis.

Use Value: 70mV dropout at 500mA enables operation from shared 3.3V PMIC rail while maintaining margin for 2.4GHz/5GHz/6GHz band switching.

Bluetooth LE Audio Earbud Codec

UWB Impulse Radio Receiver

Use Scenario: Biasing low-power audio codecs and DSPs in true wireless stereo earbuds with tight battery constraints.

IC Role / Device Role / Timing Role: Ultra-low-I_Q (110µA) LDO enabling always-on voice wake-up functionality.

Use Value: 110µA quiescent current extends standby time beyond 7 days on a 50mAh cell, meeting Bluetooth SIG LE Audio requirements.

Use Scenario: Powering ultra-wideband (UWB) impulse radio receiver chains requiring sub-nanosecond timing stability.

IC Role / Device Role / Timing Role: Low-jitter, low-noise 2.8V supply for time-of-flight measurement circuits.

Use Value: 16µV_rms noise floor ensures <±5cm ranging accuracy in indoor UWB localization systems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6217B282MR-G	Fixed 2.8V, 500mA, 25µV_rms noise, no LCON current-select feature	Lacks configurable current limit and auto-discharge; lower PSRR (70dB @ 1kHz)	Choose when cost sensitivity outweighs need for 1A capability or RF-grade noise performance
Richtek RT9080A-28PU5	Fixed 2.8V, 1A, 20µV_rms noise, 75dB PSRR @ 1kHz, no LCON pin	Higher noise and lower PSRR than AP7368; lacks inrush limiting and foldback protection	Prefer when board space allows larger SOT-23-5 and thermal design accommodates higher θ_JA

Compared with XC6217B282MR-G and RT9080A-28PU5, the AP7368D-28RS4-7 uniquely combines dual-current-limit selection, industry-leading 16µV_rms noise, and integrated auto-discharge-making it optimal for space-constrained, noise-sensitive RF applications where dynamic load management is required.

Availability

AP7368D-28RS4-7 is available at Aetrix Electronics and suitable for smartphone RF front-end modules, Wi-Fi 6E transceiver supplies, and Bluetooth LE audio earbud designs requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7368D-28RS4-7 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 communications markets.

The AP7368 series belongs to Diodes' precision low-noise LDO portfolio, engineered specifically for RF and high-speed digital applications demanding ultra-low noise, high PSRR, and minimal dropout in miniature packages.

FAQ

What is the minimum input voltage required for stable 2.8V output at 1A load?

The AP7368D-28RS4-7 requires VIN ≥ 2.945V to maintain regulated 2.8V output at 1A load, based on maximum dropout voltage of 145mV (typical 125mV) at 2.8V output. Below this, output voltage drops linearly with input; operation below 1.7V input is prohibited per absolute maximum ratings.

Does the LCON pin require external pull-up or pull-down resistors?

No external resistors are required: LCON has internal pull-down current ≤0.3µA and specified logic thresholds (≤0.4V low, ≥1V high). Driving LCON directly from GPIO or open-drain logic is sufficient; floating LCON defaults to "L" (500mA mode) but is not recommended for production due to noise susceptibility.

How does the auto-discharge function operate, and what is its effective resistance?

When EN is pulled low, an internal N-channel MOSFET connects VOUT to GND through a nominal 30Ω path, discharging output capacitance. This occurs only during shutdown and is independent of LCON state. The 30Ω value ensures rapid discharge (τ ≈ 30Ω × C_OUT) without excessive peak current.

Can the AP7368D-28RS4-7 be used in automotive applications?

The AP7368D-28RS4-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7368Q series) with PPAP support, IATF 16949 manufacturing, and extended temperature validation. For automotive use, contact Diodes' automotive sales team to obtain qualified alternatives with full change control documentation.

AP7368D-28RS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-XFDFN Exposed Pad

Packaging:: Bulk

Product Status:: Active

Applications:: LDO, Cameras, Wireless Devices

Voltage - Input:: 5.5V

Number of Outputs:: 1

Voltage - Output:: 2.8V

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

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

AP7368D-28RS4-7 FAQ

1.How can I place an order for AP7368D-28RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7368D-28RS4-7 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 AP7368D-28RS4-7 reliable?

The price and inventory of AP7368D-28RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7368D-28RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7368D-28RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7368D-28RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7368D-28RS4-7?

AP7368D-28RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7368D-28RS4-7 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 AP7368D-28RS4-7?

For technical support, including AP7368D-28RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7368D-28RS4-7 requirements.

6.How does Aetrix verify that AP7368D-28RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7368D-28RS4-7 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 AP7368D-28RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7368D-28RS4-7?

All AP7368D-28RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7368D-28RS4-7, 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 AP7368D-28RS4-7 part is unused and in its original packaging.

Return procedure for AP7368D-28RS4-7:

1.Submit a request within 90 days.

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

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