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Diodes Incorporated AP65550SP-13
- Part No.:
- AP65550SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP65550SP-13.pdf
- Description:
- IC REG BUCK ADJ 5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,135
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Product details
Overview
AP65550SP-13 from Diodes Incorporated is a synchronous step-down DC-DC converter IC with adaptive constant-on-time (aCOT) control, delivering 5A continuous output current at up to 18V input and 0.765V–6V adjustable output. It integrates 65mΩ high-side and 36mΩ low-side MOSFETs, operates at 650kHz pseudo-fixed frequency, and supports seamless CCM/DCM transition for high light-load efficiency in digital TV and monitor power rails.
For engineers reviewing the AP65550SP-13 datasheet, AP65550SP-13 pinout, AP65550SP-13 application, or AP65550SP-13 equivalent, key selection criteria include its adaptive on-time transient response, dual-package availability (SO-8EP), programmable soft-start timing, and compatibility with ultra-low-ESR ceramic and polymer capacitors.
Technical Context
The AP65550SP-13 implements an adaptive on-time control architecture that dynamically calculates per-cycle on-time based on VIN and VOUT - tON ∝ VOUT/VIN - enabling stable regulation across wide input/output ratios without external compensation. Its digital control logic includes valley-current sensing for OCP and a dedicated soft-start ramp generator referenced to the SS pin.
It features integrated thermal shutdown at +160°C with +30°C hysteresis, undervoltage lockout with 3.45V turn-on threshold and 320mV hysteresis, and pre-biased start-up capability. The internal 5V VREG5 rail powers gate drivers and supports external decoupling with a 1µF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports 5V, 12V, and 15V intermediate bus architectures without derating. |
| Output Voltage Range | 0.765V to 6V - adjustable via external resistor divider; 0.765V reference enables core voltage regulation for modern SoCs. |
| Continuous Output Current | 5A - sufficient for FPGA I/O banks, DDR memory termination, and GPU auxiliary rails. |
| Switching Frequency | 650kHz - balances EMI performance and inductor size; pseudo-constant due to adaptive on-time control. |
| HS/LS RDS(ON) | 65mΩ / 36mΩ - reduces conduction loss at full load; enables >90% peak efficiency at 12V→1.05V conversion. |
| Soft-Start Current | 6.0µA typical - sets ramp time with external SS capacitor; supports controlled inrush limiting during power-up. |
| Feedback Voltage Accuracy | ±1.5% over -40°C to +85°C - ensures tight output regulation under thermal stress without trimming. |
Pinout & Package
AP65550SP-13 is packaged in SO-8EP (exposed pad), offering enhanced thermal performance with θJA = 39.4°C/W and θJC = 8.6°C/W on standard 2"×2" FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Digital logic-level input; ≥1.9V enables regulator; internal pull-up not provided - requires 100kΩ to VIN for auto-start. |
| FB (Pin 2) | Feedback sensing node | Connects to resistive divider; regulates output by comparing VFB to 0.765V internal reference. |
| VREG5 (Pin 3) | Internal LDO output | Supplies 5V ±0.4V for gate drivers; requires 1µF ceramic capacitor to PGND for stability and noise suppression. |
| SS (Pin 4) | Soft-start timing control | Charged by 6µA current source; external capacitor to PGND sets output voltage ramp time (tSS ≈ 63·CSS). |
| GND (Pin 5) | Analog ground reference | Reference for error amplifier and internal logic; must be separated from PGND in layout to minimize noise coupling. |
| SW (Pin 6) | Power switching node | Drives external LC filter; connects to BST via 0.1µF bootstrap capacitor to sustain high-side gate drive. |
| BST (Pin 7) | Bootstrap supply terminal | Provides floating gate drive voltage for high-side NMOS; requires low-ESR 0.1µF capacitor between BST and SW. |
| VIN (Pin 8) | Main power input | Accepts 4.5–18V; requires local 10µF+ ceramic input capacitor to PGND for ripple suppression and surge handling. |
| PGND (Pin 9, Exposed Pad) | Power ground return | Primary return path for high-current switching loop; exposed pad must be soldered to large copper pour for thermal and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Constant-On-Time Control | Enables <10µs load transient recovery without external compensation components or loop tuning. |
| Synchronous Rectification | Integrated 65mΩ/36mΩ MOSFETs eliminate external diode losses and reduce thermal footprint in compact designs. |
| Capacitor Flexibility | Stable with ceramic, SP-CAP, and POSCAP outputs - no minimum ESR requirement simplifies BOM and layout. |
| Light-Load Efficiency Mode | Automatic DCM entry below ~1A load maintains >85% efficiency at 10mA, critical for standby power compliance. |
| Robust Protection Suite | Includes cycle-by-cycle OCP (6.4A typ), non-latching UVLO (3.45V/3.75V), and thermal shutdown with automatic recovery. |
Applications
| Flat Screen TV Power Rails | FPGA Core & I/O Supplies |
|---|---|
|
Use Scenario: Regulating 1.05V/1.2V/1.8V rails for LCD panel timing controllers and video processors in 4K UHD TVs. IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck regulator delivering tightly regulated, low-noise DC power synchronized to display refresh cycles. Use Value: Adaptive on-time control suppresses output voltage droop during rapid backlight dimming transitions, preventing visible image artifacts. |
Use Scenario: Supplying configurable core (VCCINT) and auxiliary (VCCAUX) voltages for Xilinx Artix-7 and Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: High-accuracy, fast-transient POL regulator meeting FPGA dynamic current slew rate requirements (up to 2A/µs). Use Value: 5A rating and 650kHz switching enable compact 2-layer PCB implementation while maintaining <±1% output deviation during configuration bursts. |
| Set-Top Box Mainboard | Network System ASIC Supplies |
|
Use Scenario: Generating 3.3V and 5V system rails for ARM-based media processors, HDMI transceivers, and USB PHYs in streaming devices. IC Role / Device Role / Timing Role: Dual-output capable primary regulator (with secondary LDOs) powering mixed-signal SoC subsystems with burst-mode traffic. Use Value: Pre-biased start-up prevents output voltage reversal during hot-plug events, ensuring reliable boot from USB-C PD sources. |
Use Scenario: Delivering 1.2V/1.8V to network switch ASICs (e.g., Broadcom BCM56xx) requiring sub-20mV ripple under 4A dynamic load steps. IC Role / Device Role / Timing Role: High-bandwidth POL regulator interfacing directly with ASIC's VRM interface for adaptive voltage scaling. Use Value: 0.765V reference and ±1.5% FB accuracy meet IEEE 802.3bt PoE++ controller tolerance specs for remote power negotiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z (Monolithic Power) | Fixed 500kHz frequency; 3.5A rating; no VREG5 pin; requires external bootstrap diode. | Limited to ≤3.5A loads; less flexible for multi-rail systems needing internal 5V bias. | Select when cost sensitivity outweighs need for adaptive transient response and 5A headroom. |
| TPS54560BQDDAQ1 (TI) | Adjustable frequency (100kHz–2.5MHz); 5A rating; integrated compensation; automotive AEC-Q100 Grade 1. | Higher BOM cost; larger solution size; qualified for automotive infotainment but over-specified for consumer displays. | Prefer for automotive-grade designs where extended temperature range and qualification supersede efficiency optimization. |
Compared with MP2315GJ-Z and TPS54560BQDDAQ1, AP65550SP-13 uniquely balances consumer-grade cost, 5A capability, adaptive transient performance, and capacitor-agnostic stability - making it optimal for space-constrained, high-volume display and set-top box power stages.
Availability
AP65550SP-13 is available at Aetrix Electronics and suitable for flat screen TV sets, gaming consoles, and FPGA power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP65550SP-13 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 solutions for consumer, industrial, and computing markets.
The AP65550 belongs to Diodes' high-performance synchronous buck converter product line, designed specifically for low-voltage, high-current POL applications in digital displays and multimedia equipment where transient response and thermal efficiency are critical.
FAQ
What package variants does AP65550SP-13 support?
AP65550SP-13 is the SO-8EP (exposed pad) variant only. The U-DFN3030-10 version is designated AP65550FN-13. Both share identical electrical specifications but differ in thermal resistance (SO-8EP: θJA = 39.4°C/W; U-DFN3030-10: θJA = 42°C/W) and pinout layout - SO-8EP uses standard 8-pin leadframe with exposed thermal pad, while U-DFN3030-10 is a 10-pin 3mm×3mm wettable flank package optimized for ultra-dense layouts.
Can AP65550SP-13 operate with ceramic output capacitors only?
Yes. AP65550SP-13's adaptive COT control architecture eliminates ESR dependency, enabling stable operation with ultra-low-ESR ceramic capacitors (e.g., 22µF X5R 0805). Unlike traditional voltage-mode controllers, it does not require minimum ESR for phase margin - verified across 1µF to 100µF ceramic values in Diodes' DS36336 Rev. 7 test data (Fig. 12–14).
How is soft-start time calculated for AP65550SP-13?
Soft-start time is determined by tSS ≈ 63 × CSS, where CSS is the capacitor value (in µF) connected between SS pin and PGND. For example, a 100nF capacitor yields ~6.3ms ramp time. This linear ramp is generated by a 6.0µA internal current source charging CSS, and directly controls output voltage rise to prevent inrush current exceeding 5A peak.
Does AP65550SP-13 support pre-biased output startup?
Yes. AP65550SP-13 includes true pre-biased start-up functionality: when EN is asserted, the internal high-side MOSFET remains off until the FB voltage falls below 0.765V, preventing reverse current flow into a pre-charged output rail. This avoids output voltage collapse or latch-up in systems with multiple cascaded regulators sharing a common output bus.
AP65550SP-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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:
- 5A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP65550SP-13 FAQ
1.How can I place an order for AP65550SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP65550SP-13 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 AP65550SP-13 reliable?
The price and inventory of AP65550SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65550SP-13 is usually 5 days.
3.What payment methods are accepted for AP65550SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65550SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP65550SP-13?
AP65550SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP65550SP-13 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 AP65550SP-13?
For technical support, including AP65550SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65550SP-13 requirements.
6.How does Aetrix verify that AP65550SP-13 is sourced from the original manufacturer or authorized distributors?
All AP65550SP-13 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 AP65550SP-13 meets industry standards.
7.What is the process for return or replacement of AP65550SP-13?
All AP65550SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP65550SP-13, 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 AP65550SP-13 part is unused and in its original packaging.
Return procedure for AP65550SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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