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Diodes Incorporated AP65455FN-7
- Part No.:
- AP65455FN-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 10-UFDFN Exposed Pad
- Datasheet:
-
AP65455FN-7.pdf
- Description:
- IC REG BUCK ADJ 4A UDFN303010
- Quantity:
- Payment:
- Shipping:
Inventory:4,961
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Product details
Overview
AP65455FN-7 from Diodes Incorporated is a 4A, 18V-input, 650kHz adaptive constant-on-time (aCOT) synchronous buck converter in U-DFN3030-10 package. It delivers ±1.5% output voltage accuracy (0.76V–6V), supports CCM/DCM seamless transition, and integrates 90mΩ high-side and 57mΩ low-side MOSFETs for digital TV and monitor power rails.
For engineers reviewing the AP65455FN-7 datasheet, AP65455FN-7 pinout, AP65455FN-7 application, or AP65455FN-7 equivalent, key selection criteria include its adaptive on-time control architecture, programmable soft-start via external capacitor, power-good open-drain output, and compatibility with ultra-low-ESR ceramic and polymer capacitors.
Technical Context
The AP65455FN-7 implements adaptive constant-on-time (aCOT) control without an internal oscillator-on-time is dynamically calculated per cycle as tON ∝ VOUT/VIN, enabling pseudo-fixed 650kHz operation across 4.5–18V input. Its valley-current OCP senses low-side MOSFET RDS(ON) during OFF time with 4ppm/°C temperature compensation.
It features dual-mode operation: CCM at full load (4A) with fast transient response (<100µs load step recovery), and DCM at light load enabled by zero-current detection and minimum on-time clamping (150ns typ). The integrated VREG5 5V LDO powers internal circuitry and requires a 1µF local bypass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports 5V, 12V, and 15V intermediate bus rails without external regulators. |
| Output Voltage Range | 0.76V to 6V - adjustable via resistor divider; 0.765V feedback reference enables precise core voltage regulation. |
| Continuous Output Current | 4A - sustained delivery with thermal shutdown at 150°C and derating based on θJA = 45.87°C/W. |
| Switching Frequency | 650kHz - pseudo-constant frequency set by adaptive on-time; enables compact LC filter design (e.g., 1.5µH + 44µF). |
| High/Low-Side RDS(ON) | 90mΩ / 57mΩ - integrated synchronous FETs eliminate external diode, improving efficiency >92% at 1.05V/4A. |
| Protection Features | UVLO (3.45V), OVP (115–125% VOUT), OCP (4.6–6.9A valley limit), OTP (150°C), and PG indicator - full-system fault coverage. |
| Soft-Start Control | Programmable via external SS-to-PGND capacitor - sets ramp time (e.g., 100nF ≈ 6.3ms) to prevent inrush current. |
Pinout & Package
AP65455FN-7 is housed in a thermally enhanced U-DFN3030-10 package (3.0mm × 3.0mm × 0.55mm) with exposed thermal pad (Pin 11, PGND) requiring direct connection to PCB ground plane for optimal thermal performance (θJC = 6.91°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Digital logic-level input (VENH ≥ 1.25V); connects directly to VIN for automatic startup; pulls low to disable regulator and reduce ISHDN to 1–10µA. |
| FB (Pin 2) | Feedback sensing node | Monitors output via resistive divider; regulates VOUT to 0.765V reference with ±1.5% tolerance over -40°C to +85°C ambient. |
| VREG5 (Pin 3) | Internal 5V LDO output | Supplies internal bias; requires 1µF ceramic capacitor to PGND; inactive when EN = low; delivers up to 100mA source current. |
| SS (Pin 4) | Soft-start timing node | Charged by 6µA internal current source; external capacitor sets output ramp time; supports pre-biased start-up. |
| PG (Pin 5) | Power-good open-drain output | Asserts high-Z when VFB ≥ 90% of reference (≈0.689V); sinks 5mA when pulled low; used for system sequencing and fault indication. |
| SW (Pins 6,7) | Switching node | Drives external LC filter; connects to BST via 0.1µF bootstrap capacitor; handles peak currents up to 6.9A during OCP events. |
| BST (Pin 8) | Bootstrap supply | Provides gate drive voltage for high-side NMOS; requires 0.1µF capacitor between BST and SW; enables 100% duty cycle capability. |
| VIN (Pins 9,10) | Main power input | Accepts 4.5–18V; requires local 10µF+ ceramic input capacitor to PGND; supports dI/dt up to 4A/µs. |
| PGND (Pin 11, Exposed Pad) | Power ground return | Primary thermal and electrical ground path; must be soldered to large copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT control | Eliminates loop compensation components; stabilizes with ceramic, SP-CAP, or POSCAP output capacitors without ESR dependency. |
| Synchronous rectification | Integrated 90mΩ/57mΩ MOSFETs enable >92% efficiency at 1.05V/4A, reducing heat sink requirements in space-constrained TV/monitor PCBs. |
| CCM-to-DCM seamless transition | Maintains >85% efficiency at 100mA load via valley-current detection and minimum on-time clamping (150ns), avoiding audible switching noise. |
| Programmable soft-start | External capacitor (e.g., 100nF) sets controlled VOUT ramp (≈6.3ms), preventing overshoot and inrush into downstream logic or DDR memory rails. |
| Robust protection suite | Includes UVLO (3.45V), OVP (120% VOUT), valley-current OCP (5.6A typ), thermal shutdown (150°C), and PG status-reducing need for external supervisors. |
Applications
| Flat Screen TV Power Rails | Gaming Console Core Supplies |
|---|---|
|
Use Scenario: Regulating 1.05V/4A CPU core voltage in 4K UHD TV SoCs under dynamic video workloads. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with adaptive COT control ensuring <100µs transient response to frame-rate load steps. Use Value: Maintains stable core voltage during rapid scene changes, preventing GPU throttling or frame drops without external compensation. |
Use Scenario: Delivering 1.2V/3.5A to FPGA-based video processing units in next-gen gaming consoles. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with programmable soft-start for safe power-up sequencing with multi-rail PMICs. Use Value: Enables clean, pre-biased start-up and eliminates output undershoot during hot-plug events in modular console architectures. |
| Set-Top Box SoC Supplies | Home Audio DSP Power |
|
Use Scenario: Generating 3.3V/2A for ARM-based media processors in streaming set-top boxes with variable Wi-Fi/Bluetooth activity. IC Role / Device Role / Timing Role: Adaptive-frequency buck converter operating in DCM during standby to minimize no-load quiescent current (0.6mA typ). Use Value: Achieves Energy Star Tier 2 compliance by sustaining <15mW no-load power consumption without external disable circuitry. |
Use Scenario: Providing low-noise 1.8V/1.5A supply to high-fidelity audio DSPs in smart speakers and soundbars. IC Role / Device Role / Timing Role: Synchronous buck with ultra-low output ripple (<10mVPP) enabled by 57mΩ low-side switch and ceramic capacitor support. Use Value: Reduces audible noise floor by eliminating ESR-dependent ripple amplification, critical for 120dB SNR audio paths. |
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) | Fixed 500kHz frequency, 3.5A rating, no VREG5 LDO, requires external bootstrap diode. | Lacks integrated VREG5 and adaptive COT; less suitable for ceramic-capacitor-only designs requiring wide VIN/VOUT ratios. | Select when fixed-frequency EMI control is prioritized over transient response and when board space allows discrete bootstrap diode. |
| TPS54332DR (Texas Instruments) | Current-mode control, 3A rating, 2.95–6V input, external compensation required, no PG output. | Lower input voltage range and missing PG signal limit use in 12V-powered consumer electronics with strict sequencing needs. | Prefer for cost-sensitive industrial 3.3V/3A rails where external compensation tuning is acceptable and sequencing is handled elsewhere. |
Compared with MP2315DJ-LF-Z and TPS54332DR, the AP65455FN-7 offers higher current (4A), wider input (4.5–18V), integrated VREG5 and PG, and adaptive COT for capacitor-agnostic stability-making it optimal for consumer video SoC power where layout simplicity and transient robustness are critical.
Availability
AP65455FN-7 is available at Aetrix Electronics and suitable for flat screen TV sets, gaming consoles, and set-top boxes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP65455FN-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 power management, signal integrity, and protection solutions for high-volume consumer and industrial markets.
The AP65455FN-7 belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for low-voltage, high-current regulation in digital TV, monitors, and multimedia equipment with stringent efficiency and transient response requirements.
FAQ
What is the recommended input capacitor for AP65455FN-7 in a 12V input, 1.05V/4A application?
A 10µF X5R/X7R ceramic capacitor rated for ≥16V with low ESR (<10mΩ) is recommended at the VIN pin, placed adjacent to Pins 9/10 and PGND. This minimizes input ripple and handles RMS current up to 2A. For surge suppression, add a 47µF aluminum polymer capacitor in parallel if the input source has high impedance or long traces.
Can AP65455FN-7 operate with only ceramic output capacitors, and what is the minimum value?
Yes-its adaptive COT control ensures stability with ultra-low-ESR ceramic capacitors alone. Minimum recommended output capacitance is 22µF (e.g., two 10µF X5R 0805s in parallel), as verified in the typical application circuit (Figure 1) for 1.05V/4A operation with <10mVPP ripple.
How does the power-good (PG) signal behave during startup and fault conditions?
PG remains low (connected to PGND) until VFB reaches 90% of the 0.765V reference (~0.689V), then transitions to high-impedance state. During OVP, UVLO, or thermal shutdown, PG pulls low within 2ms. It supports open-drain wired-OR with other PG signals and requires a 10kΩ pull-up to VOUT or VCC.
Is AP65455FN-7 compatible with pre-biased outputs, and how is this enabled?
Yes-the device supports pre-biased start-up via internal circuitry that disables the low-side MOSFET during initial soft-start, preventing reverse current flow into a pre-charged output. This is enabled automatically when EN is asserted while VOUT > 0.76V; no external components or configuration are required.
AP65455FN-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 10-UFDFN 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):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 4A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN3030-10
AP65455FN-7 FAQ
1.How can I place an order for AP65455FN-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP65455FN-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 AP65455FN-7 reliable?
The price and inventory of AP65455FN-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65455FN-7 is usually 5 days.
3.What payment methods are accepted for AP65455FN-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65455FN-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP65455FN-7?
AP65455FN-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP65455FN-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 AP65455FN-7?
For technical support, including AP65455FN-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65455FN-7 requirements.
6.How does Aetrix verify that AP65455FN-7 is sourced from the original manufacturer or authorized distributors?
All AP65455FN-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 AP65455FN-7 meets industry standards.
7.What is the process for return or replacement of AP65455FN-7?
All AP65455FN-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP65455FN-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 AP65455FN-7 part is unused and in its original packaging.
Return procedure for AP65455FN-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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