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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated AUR9718BGD

Name: AUR9718BGD
Brand: Diodes Incorporated
SKU: AUR9718BGD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AUR9718BGD

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-WDFN Exposed Pad

Datasheet:: AUR9718BGD.pdf

Description:: IC REG BUCK ADJ 2.5A 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,560

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Product details

Overview

AUR9718BGD from BCD Semiconductor Manufacturing Limited is a synchronous step-down DC-DC converter IC optimized for portable power regulation. It integrates PMOS/NMOS power switches (100 mΩ R_DS(ON) each), delivers up to 2.5 A output current, operates at a fixed 1.5 MHz switching frequency, and supports adjustable output voltage from 0.8 V to V_IN across a 2.7–5.5 V input range-enabling compact designs in LCD TV and notebook computer power rails.

For engineers reviewing the AUR9718BGD datasheet, AUR9718BGD pinout, AUR9718BGD application, or AUR9718BGD equivalent, key selection criteria include its integrated synchronous FETs, 0.8 V feedback reference, thermal shutdown (150 °C), input overvoltage protection (5.8–6.0 V), and DFN-3×3-6 package compatibility with high-density PCB layouts.

Technical Context

The AUR9718BGD employs peak-current mode control with built-in oscillator and timing circuitry, eliminating external frequency-setting components. Its dual-input architecture separates analog supply (VIN_A) from switch supply (VIN_SW), improving noise immunity and enabling independent biasing of control circuitry.

Functional integration includes soft-start (400 µs), under-voltage lockout (2.4 V rising threshold), short-circuit recovery via FB-pin monitoring, and 100% duty-cycle low-dropout operation-supporting seamless transition into LDO-like behavior during deep input-to-output differentials.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1.5 MHz ±20% - enables use of ≤3.3 µH inductors and <22 µF ceramic output capacitors for space-constrained portable designs.
Output Current	2.5 A continuous - supported by internal 100 mΩ PMOS and NMOS switches, with peak inductor current rating of 3.5 A.
Feedback Voltage	0.800 V ±2% - sets precise output regulation point; output voltage configured as V_OUT = 0.8 V × (1 + R1/R2).
Input Voltage Range	2.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), USB 5 V, and multi-cell alkaline/battery systems.
Thermal Shutdown	150 °C with 30 °C hysteresis - protects against sustained overload or poor PCB thermal design without requiring external sensing.
Input OVP Threshold	5.8–6.0 V - disables switching and forces shutdown if input exceeds safe operating range, preventing damage to internal MOSFETs.
Enable Threshold	V_{EN_H} = 1.5 V, V_{EN_L} = 0.4 V - provides clean logic-level control with 1 µA enable input current for low-power sequencing.

Pinout & Package

Package: DFN-3×3-6 with exposed thermal pad (pin 5), RoHS-compliant green finish. Thermal resistance θ_JA = 40.11 °C/W on standard 2-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 (FB)	Feedback input	Connects to resistor divider; senses output voltage and regulates to 0.8 V reference; high-impedance node requiring short, noise-immune trace routing.
2 (GND)	Analog and power ground	Common return for control circuitry and power stage; must be tied to exposed thermal pad for optimal thermal performance and noise rejection.
3 (SW)	Switch node	Drives external inductor; carries high di/dt square-wave current; requires minimal loop area and separation from sensitive analog nodes (e.g., FB).
4 (VIN_SW)	Power switch supply	Provides gate drive and conduction path for internal MOSFETs; requires local 4.7 µF low-ESR ceramic capacitor placed adjacent to pin.
5 (VIN_A)	Analog circuit supply	Powers error amplifier, oscillator, and logic; decoupled separately from VIN_SW to suppress switching noise coupling into control loop.
6 (EN)	Enable input	Active-high digital control; pulls device into shutdown mode (<1 µA quiescent current) when driven low; supports power sequencing with external MCU or supervisor.

Key Features

Feature	Design Value
Synchronous rectification	Integrated 100 mΩ PMOS + 100 mΩ NMOS switches eliminate external Schottky diode, reducing conduction loss and board area.
Fixed 1.5 MHz operation	No external timing components required; ensures predictable EMI profile and simplifies filter design for FCC/CE compliance.
100% duty cycle capability	Enables dropout operation down to V_OUT – V_IN ≈ 0 V, supporting ultra-low input-to-output differentials without regulation loss.
Input overvoltage protection	Auto-shutdown at 5.8–6.0 V prevents latch-up or avalanche failure during transient surges on shared 5 V rails.
Soft-start timing	400 µs internal ramp prevents inrush current and output overshoot during power-up, eliminating need for external RC networks.

Applications

LCD TV Power Rails

Set-Top Box Core Logic Supply

Use Scenario: Regulating 5 V input to 3.3 V or 1.2 V for TCON, MCU, and memory interfaces in slim-panel LCD TVs.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise core voltage with fast load transient response.

Use Value: 90%+ efficiency at 1.5 A load minimizes heat buildup in sealed enclosures; 1.5 MHz switching avoids audible noise in audio-sensitive zones.

Use Scenario: Generating 1.0 V or 1.2 V for ARM-based SoCs in cable/satellite set-top boxes with tight thermal constraints.

IC Role / Device Role / Timing Role: High-current, adjustable-output DC-DC converter providing tightly regulated SoC core voltage with dynamic voltage scaling support.

Use Value: 0.8 V feedback reference and ±3% output accuracy ensure reliable SoC boot and operation; EN pin enables firmware-controlled power gating.

Notebook Computer I/O Rail

PDA System-on-Module Supply

Use Scenario: Converting battery voltage (3.0–4.2 V) to 3.3 V for USB PHY, PCIe retimers, and display interface circuits.

IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter operating across full Li-ion voltage range with no external compensation.

Use Value: DFN-3×3-6 footprint saves >30% board area vs. SO-8 alternatives; thermal shutdown protects against sustained 2.5 A loads in confined chassis.

Use Scenario: Providing 1.8 V or 2.5 V for application processors and LPDDR memory in handheld PDAs with limited PCB real estate.

IC Role / Device Role / Timing Role: Integrated power solution replacing discrete buck controllers + MOSFETs, reducing BOM count and layout complexity.

Use Value: Built-in short-circuit recovery (via FB < 0.4 V detection) enables autonomous fault handling without host intervention during hot-plug events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z (Monolithic Power)	2.2 MHz switching, 3 A rating, 0.8 V reference, but requires external bootstrap capacitor and lacks input OVP.	Better suited for ultra-compact designs needing higher frequency; less robust in unregulated 5 V input environments.	Select when board space is critical and input rail is well-clamped; verify external bootstrap layout and thermal derating above 2 A.
TPS562201DDCR (Texas Instruments)	Adjustable 600 kHz–1.8 MHz, 2 A, 0.8 V reference, integrated compensation, but no dedicated VIN_A/VIN_SW separation.	Offers wider frequency tuning and simpler loop compensation; lower max current limits use in high-load PDA modules.	Prefer for cost-sensitive industrial designs where 2 A suffices and unified input supply simplifies layout.

Compared with MP2315DJ-LF-Z and TPS562201DDCR, the AUR9718BGD uniquely combines dual-input supply isolation, input OVP, and 2.5 A capability in a 3×3 mm DFN-making it optimal for consumer electronics with noisy or unregulated inputs and strict thermal envelopes.

Availability

AUR9718BGD is available at Aetrix Electronics and suitable for LCD TV power rails, set-top box core logic supplies, and notebook computer I/O rail designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AUR9718BGD 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

BCD Semiconductor Manufacturing Limited is a China-based fabless analog IC designer specializing in high-efficiency power management solutions for consumer, computing, and industrial markets.

The AUR9718B belongs to BCD's synchronous buck converter product line, engineered specifically for space-constrained portable devices demanding high current density, low quiescent power, and robust protection features without external components.

FAQ

What is the minimum recommended output capacitance for stable operation?

The datasheet specifies 22 µF ceramic output capacitance (X7R, 10 V rating) for 1.2 V output at 2.5 A. Lower values may cause instability or excessive ripple; ESR must remain below 10 mΩ. Layout must minimize trace inductance between COUT and GND/VOUT pins to maintain phase margin above 45°.

Can AUR9718BGD operate with only VIN_SW connected and VIN_A floating?

No. VIN_A must be connected to a clean 2.7–5.5 V supply independent of VIN_SW. Floating VIN_A causes undefined behavior in the error amplifier and oscillator, leading to erratic switching or complete failure. Both supplies are mandatory per Absolute Maximum Ratings and Functional Block Diagram.

How does the short-circuit protection recover after fault clearance?

When V_FB drops below 0.4 V due to output short, the IC enters soft-start mode. Recovery occurs automatically once V_FB rises above 0.4 V-typically after short removal and output capacitor recharge-without requiring EN toggling or power cycle.

Is the exposed thermal pad electrically connected internally?

Yes. The exposed pad (pin 5) is internally connected to GND. It must be soldered to a solid copper thermal plane on the PCB and tied directly to the main GND net to achieve specified θ_JA = 40.11 °C/W and prevent thermal shutdown under 2.5 A load.

AUR9718BGD Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-WDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 5.5V

Current - Output:: 2.5A

Frequency - Switching:: 1.5MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 80°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (3x3)

AUR9718BGD FAQ

1.How can I place an order for AUR9718BGD through Aetrix?

Please submit a Request for Quotation (RFQ) for AUR9718BGD 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 AUR9718BGD reliable?

The price and inventory of AUR9718BGD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AUR9718BGD is usually 5 days.

3.What payment methods are accepted for AUR9718BGD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AUR9718BGD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AUR9718BGD?

AUR9718BGD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AUR9718BGD 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 AUR9718BGD?

For technical support, including AUR9718BGD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AUR9718BGD requirements.

6.How does Aetrix verify that AUR9718BGD is sourced from the original manufacturer or authorized distributors?

All AUR9718BGD 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 AUR9718BGD meets industry standards.

7.What is the process for return or replacement of AUR9718BGD?

All AUR9718BGD units undergo pre-shipment inspection (PSI). If there is an issue with AUR9718BGD, 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 AUR9718BGD part is unused and in its original packaging.

Return procedure for AUR9718BGD:

1.Submit a request within 90 days.

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

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