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Diodes Incorporated AP65355FN-7
- Part No.:
- AP65355FN-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 10-UFDFN Exposed Pad
- Datasheet:
-
AP65355FN-7.pdf
- Description:
- IC REG BUCK ADJ 3A UDFN303010
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
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Product details
Overview
AP65355FN-7 from Diodes Incorporated is a synchronous step-down DC-DC converter IC delivering 3A continuous output current with adaptive constant-on-time (aCOT) control, 650kHz pseudo-fixed switching frequency, and 0.76V to 6V adjustable output voltage across 4.5–18V input range. It integrates 90mΩ high-side and 57mΩ low-side NMOS switches, supports ceramic/SP-CAP/POSCAP output capacitors, and targets power regulation in flat-panel TV, gaming consoles, and set-top boxes.
For engineers reviewing the AP65355FN-7 datasheet, AP65355FN-7 pinout, AP65355FN-7 application, or AP65355FN-7 equivalent, key selection considerations include its adaptive COT transient response, programmable soft-start via external capacitor, power-good open-drain output, and thermal shutdown at 150°C - all validated for consumer-grade ambient operation up to +85°C.
Technical Context
The AP65355FN-7 implements adaptive on-time control without an internal oscillator: on-time is dynamically calculated per cycle as tON ∝ VOUT/VIN, enabling pseudo-constant 650kHz operation across wide VIN/VOUT ratios. Its valley-current OCP senses low-side MOSFET conduction during DCM, with temperature-compensated trip threshold (4ppm/°C).
It transitions seamlessly between CCM and DCM using zero-current detection on the low-side switch, maintaining >85% efficiency at 10mA load. The internal 5V VREG5 rail powers bias circuitry and requires a 1µF local ceramic capacitor; PG output asserts high-impedance when FB reaches ≥90% of 0.765V reference.
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 LDO pre-regulation. |
| Output Voltage Range | 0.76V to 6V - adjustable via resistor divider; 0.765V ±12mV reference ensures ≤±1.5% DC accuracy over -40°C to +85°C. |
| Continuous Output Current | 3A - sustained with U-DFN3030-10 package and θJA = 45.87°C/W on 1"×1" 2oz copper PCB. |
| Switching Frequency | 650kHz - pseudo-fixed via adaptive on-time; enables compact LC filter design with ≤2.2µH inductors. |
| High/Low-Side RDS(ON) | 90mΩ / 57mΩ - reduces conduction loss at full load; combined ~147mΩ total path resistance limits I²R loss to <1.3W at 3A. |
| Soft-Start Time | Programmable - ISS source current 6.0µA typical; 100nF SS-to-PGND yields ~63ms ramp (tSS = 63 × 10³ × CSS). |
| Thermal Shutdown | 150°C with 25°C hysteresis - disables both MOSFETs and initiates soft-start recovery at 130°C junction temperature. |
Pinout & Package
AP65355FN-7 is housed in a thermally enhanced U-DFN3030-10 package (3.0mm × 3.0mm × 0.55mm) with exposed PGND pad (Pin 11) requiring direct connection to large 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; high ≥1.25V enables regulator; can be tied directly to VIN for automatic startup. |
| FB (Pin 2) | Feedback sensing node | Monitors output via resistive divider; regulates VOUT to 0.765V reference; bias current ±0.1μA minimizes divider error. |
| VREG5 (Pin 3) | Internal 5V bias rail | Supplies gate drivers and control logic; requires 1μF ceramic cap to PGND; inactive when EN = low. |
| SS (Pin 4) | Soft-start timing node | Charged by 6.0μA current source; external capacitor sets output ramp time; discharges during OCP fault recovery. |
| PG (Pin 5) | Power-good indicator | Open-drain output; high-Z when VFB ≥90% of reference; sinks 5mA max when asserted low. |
| SW (Pins 6,7) | Switching node | Connects to inductor and bootstrap capacitor; carries high di/dt; requires low-inductance layout to minimize ringing. |
| BST (Pin 8) | Bootstrap supply | Drives high-side gate; requires 0.1μF ceramic cap between BST and SW; critical for NMOS gate turn-on above VIN. |
| VIN (Pins 9,10) | Main power input | Accepts 4.5–18V; requires bulk capacitance to PGND; dual pins reduce IR drop and improve thermal spreading. |
| PGND (Pin 11) | Power ground | Exposed thermal pad; must be soldered to ≥1cm² solid PGND plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT Control | Enables <10µs load transient recovery without external compensation components; stabilizes with ceramic output caps ≥20µF. |
| Synchronous Rectification | Integrated 90mΩ/57mΩ MOSFETs eliminate external Schottky loss; achieves >92% peak efficiency at 12V→1.05V/3A. |
| Light-Load Efficiency Mode | Automatic DCM entry below ~300mA load; reduces switching frequency and fixes tON(min) to maintain <25mV output ripple. |
| Comprehensive Protection | Includes UVLO (3.65V start, 3.45V stop), OVP (VIN >20V clamp), OTP (150°C shutdown), OCP (valley-current limit at 4.5A typ), and pre-biased startup. |
| Green Compliance | Fully RoHS-compliant, lead-free, halogen-free (<900ppm Br+Cl), antimony-free - meets Diodes Inc.'s "Green" definition. |
Applications
| Gaming Console Core Power | Flat-Panel TV SoC Supply |
|---|---|
|
Use Scenario: Regulating 1.05V core voltage for ARM-based application processors in handheld and console platforms. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering 3A continuous current with fast transient response to CPU DVFS events. Use Value: Adaptive COT control maintains <±15mV output deviation during 0→3A 100ns load steps, preventing processor brownouts. |
Use Scenario: Generating 3.3V/2.5V auxiliary rails for display interface ICs and audio DACs in 4K UHD TVs. IC Role / Device Role / Timing Role: Secondary buck regulator with programmable soft-start to sequence power-up after main 12V rail. Use Value: PG output coordinates system reset timing; VREG5 powers local level-shifters, eliminating need for discrete LDO. |
| Set-Top Box Memory Rail | Home Audio DSP Supply |
|
Use Scenario: Providing 1.2V DDR3 memory termination voltage in cable/satellite STBs with tight space constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter operating in forced CCM to minimize output ripple noise coupling into video paths. Use Value: U-DFN3030-10 footprint (9mm²) and ceramic-cap compatibility enable <3mm board height; 650kHz switching avoids AM radio band. |
Use Scenario: Delivering clean 1.8V supply to low-noise audio DSPs in smart speakers and soundbars. IC Role / Device Role / Timing Role: Low-ESR optimized regulator supporting POSCAP/SP-CAP output caps to suppress 100kHz–1MHz switching artifacts. Use Value: Stable loop with <0.5mV RMS output noise at 3A enables SNR >110dB in 24-bit audio conversion 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; no adaptive COT; 2.5A rated; requires external bootstrap diode. | Lacks seamless CCM/DCM transition; slower transient response (>20µs); lower max current limits use in 3A designs. | Select only if fixed-frequency EMI profile is mandatory and load current stays ≤2.5A. |
| RT7297BZSP (Richtek) | 600kHz fixed frequency; integrated boot diode; 3A rating; no VREG5 rail or PG output. | Missing power-good signaling and dedicated bias rail complicates system sequencing and peripheral powering. | Prefer where board space is constrained but system-level power sequencing is handled externally. |
Compared with MP2315DJ-LF-Z and RT7297BZSP, the AP65355FN-7 uniquely combines adaptive COT transient performance, integrated VREG5/PG, and full protection suite in a 3A-rated U-DFN package - making it optimal for consumer electronics requiring robust, low-noise, sequenced multi-rail power.
Availability
AP65355FN-7 is available at Aetrix Electronics and suitable for flat-screen TV sets and monitors, gaming consoles, and set-top boxes requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-qualified alternatives.
Supply support for AP65355FN-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 consumer, industrial, and computing markets.
The AP65355 belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained consumer electronics demanding fast transient response and simplified layout without external compensation.
FAQ
Is AP65355FN-7 still in active production?
No - Diodes Incorporated officially discontinued the AP65355FN-7 (OBSOLETE status per DS37875 Rev. 3-4, March 2021). Aetrix Electronics maintains limited legacy stock for ongoing production support and offers engineering-guided migration paths to functionally aligned replacements with validated pinout and performance equivalence.
Can AP65355FN-7 operate with only ceramic output capacitors?
Yes - its adaptive COT control and proprietary stability circuitry explicitly support ultra-low-ESR ceramic capacitors (≥20µF), SP-CAP, and POSCAP types without requiring series resistance or external compensation. This eliminates ESR-dependent loop instability common in traditional voltage-mode controllers.
What is the minimum recommended input capacitance for AP65355FN-7?
A minimum 10µF X5R/X7R ceramic capacitor placed near VIN and PGND pins is required. For 12V input at 3A, a 22µF/25V ceramic plus 10µF tantalum (or 47µF polymer) is recommended to handle RMS input ripple current ≥1.5A and suppress high-frequency switching noise.
How does the AP65355FN-7 handle pre-biased outputs during startup?
It supports pre-biased start-up via internal circuitry that disables the low-side MOSFET until the FB voltage rises above 0.76V, preventing reverse current flow into a pre-charged output. This avoids output voltage overshoot and protects downstream loads in hot-swap or multi-rail sequencing scenarios.
AP65355FN-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:
- 3A
- 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
AP65355FN-7 FAQ
1.How can I place an order for AP65355FN-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP65355FN-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 AP65355FN-7 reliable?
The price and inventory of AP65355FN-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65355FN-7 is usually 5 days.
3.What payment methods are accepted for AP65355FN-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65355FN-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP65355FN-7?
AP65355FN-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP65355FN-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 AP65355FN-7?
For technical support, including AP65355FN-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65355FN-7 requirements.
6.How does Aetrix verify that AP65355FN-7 is sourced from the original manufacturer or authorized distributors?
All AP65355FN-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 AP65355FN-7 meets industry standards.
7.What is the process for return or replacement of AP65355FN-7?
All AP65355FN-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP65355FN-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 AP65355FN-7 part is unused and in its original packaging.
Return procedure for AP65355FN-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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