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Diodes Incorporated AP65450SP-13
- Part No.:
- AP65450SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP65450SP-13.pdf
- Description:
- IC REG BUCK ADJ 4A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,656
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Product details
Overview
AP65450SP-13 from Diodes Incorporated is a synchronous step-down DC-DC converter IC delivering 4A continuous output current, operating from 4.5V–18V input and regulating down to 0.76V–6V output with ±1.5% feedback voltage accuracy (0.765V typ). It uses adaptive constant-on-time (COT) control at 650kHz pseudo-fixed frequency, features integrated 65mΩ high-side and 36mΩ low-side MOSFETs, and targets low-voltage power rails in digital TV, monitors, and FPGA supplies.
For engineers reviewing the AP65450SP-13 datasheet, AP65450SP-13 pinout, AP65450SP-13 application, or AP65450SP-13 equivalent, key selection criteria include its adaptive COT transient response, SO-8EP thermal performance (θJA = 70°C/W), programmable soft-start via external capacitor, and seamless CCM-to-DCM transition for light-load efficiency.
Technical Context
The AP65450SP-13 implements adaptive COT control without an internal oscillator: on-time is dynamically calculated as tON ∝ VOUT/VIN, enabling stable operation across wide input/output ratios. Its error amplifier compares FB voltage (0.765V reference) against a ramp generated by SS pin current (6.0μA typ) during soft-start.
Over-current protection samples low-side MOSFET RDS(ON) voltage during OFF time, with temperature-compensated trip threshold and 16-cycle fault counter for hiccup-mode limiting. Thermal shutdown activates at +160°C with +30°C hysteresis, and UVLO engages below 3.45V with 320mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports 5V, 12V, and 15V intermediate bus architectures without pre-regulation. |
| Output Voltage Range | 0.76V to 6V - adjustable via resistor divider; 0.765V ±1.5% reference enables precise core voltage regulation for SoCs/FPGAs. |
| Continuous Output Current | 4A - sustained delivery with internal MOSFETs eliminates need for external power switches in compact designs. |
| Switching Frequency | 650kHz (pseudo-fixed) - balances EMI control, inductor size, and efficiency; no external clock required. |
| High-Side RDS(ON) | 75mΩ max - reduces conduction loss at 4A load; junction-to-ambient thermal resistance of 70°C/W requires minimal PCB copper. |
| Soft-Start Current | 6.0μA typ - sets ramp rate with external capacitor; enables controlled inrush current limiting during power-up. |
| Feedback Bias Current | ±0.1μA - minimizes resistor-divider error, supporting high-value feedback networks for low quiescent current. |
Pinout & Package
AP65450SP-13 is housed in an SO-8EP (exposed pad) package optimized for thermal dissipation in high-current DC-DC applications. The exposed thermal pad must be soldered to a PCB ground plane for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Digital logic-level input; high ≥1.9V enables regulator, low ≤0.6V disables it; internal pull-up not provided. |
| FB (Pin 2) | Feedback sensing node | Monitors output voltage via resistive divider; regulates output to 0.765V reference with ±1.5% tolerance. |
| VREG5 (Pin 3) | Internal LDO output | Supplies 5V (4.7–5.5V) bias for gate drivers; requires 1μF ceramic capacitor to GND for stability. |
| SS (Pin 4) | Soft-start timing node | Charged by 6.0μA current source; external capacitor sets linear output voltage ramp time. |
| GND (Pin 5) | Main power ground | Reference for switching node, feedback, and enable; connects directly to exposed thermal pad. |
| SW (Pin 6) | Power switch node | Drives external LC filter; connects to bootstrap capacitor and inductor; handles peak currents up to 6.9A. |
| BS (Pin 7) | Bootstrap supply terminal | Connects to SW via 0.1μF ceramic capacitor to generate gate drive voltage for high-side MOSFET. |
| VIN (Pin 8) | Main input supply | Accepts 4.5–18V; requires local 10μF+ ceramic capacitor to suppress high-frequency ripple and dI/dt noise. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT Control | Enables fast load transient response (<10μs recovery) and stable loop behavior with ceramic or polymer output capacitors. |
| Synchronous Rectification | Integrated 65mΩ/36mΩ MOSFETs eliminate external diode losses, achieving >92% efficiency at 4A/3.3V out from 12V in. |
| DCM Operation at Light Load | Automatic mode shift below ~0.5A maintains >85% efficiency at 10mA, reducing standby power in always-on systems. |
| Programmable Soft-Start | External capacitor on SS pin allows user-defined ramp time (e.g., 1ms with 167nF), preventing inrush-induced rail collapse. |
| Robust Protection Suite | Includes UVLO (3.45V trip), OCP with temperature-compensated threshold, and thermal shutdown (+160°C) with auto-recovery. |
Applications
| Gaming Console Power Rails | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Powering GPU memory and I/O banks in compact gaming consoles requiring tight voltage tolerance and rapid load transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.05V/4A with <10μs transient recovery to handle bursty GPU workloads. Use Value: Adaptive COT control ensures stable output during sudden current steps up to 3A/μs without external compensation. |
Use Scenario: Supplying configurable logic core voltage (e.g., 0.85V–1.2V) for Xilinx Artix-7 or Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: Adjustable low-noise DC-DC converter with ±1.5% output accuracy meeting FPGA VCCINT tolerance requirements. Use Value: Programmable soft-start prevents configuration failure during FPGA bitstream loading by controlling inrush slew rate. |
| Digital TV Mainboard SoC Supply | Set-Top Box DDR Memory Rail |
Use Scenario: Generating 1.1V/3A for ARM-based SoCs (e.g., Amlogic S905X) in 4K smart TVs with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 650kHz to avoid AM radio band interference while maintaining light-load efficiency. Use Value: SO-8EP thermal design supports 4A continuous load in confined TV mainboard layouts without heatsinks. |
Use Scenario: Providing 1.2V/2.5A to LPDDR3/DDR4 memory subsystems in cable/satellite set-top boxes with thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck regulator with DCM mode enabling <15mV p-p ripple at 100mA standby current. Use Value: Seamless CCM-to-DCM transition eliminates audible coil whine during channel-change idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | Fixed 650kHz frequency, 0.8V reference, 2A output rating, TSOT23-8 package | Limited to ≤2A loads; lacks adaptive COT and DCM mode - lower light-load efficiency and slower transient response | Select when board space is critical and load current remains ≤2A; verify loop stability with ceramic output caps. |
| TPS54332DR (Texas Instruments) | Adjustable frequency (100kHz–2.5MHz), 3.5A output, SOIC-8 package, external compensation | Requires external RC network for loop tuning; higher quiescent current (125μA vs. 0.9mA) impacts ultra-low-power standby | Prefer when frequency flexibility or tighter EMI filtering is needed; accept added BOM cost and layout complexity. |
Compared with MP2451DT-LF-Z and TPS54332DR, the AP65450SP-13 delivers higher output current (4A), superior light-load efficiency via DCM, and simpler design with no external compensation - making it optimal for space-constrained, high-transient consumer electronics.
Availability
AP65450SP-13 is available at Aetrix Electronics and suitable for digital TV mainboards, gaming console power modules, and FPGA development platforms requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP65450SP-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 power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The AP65450SP-13 belongs to Diodes' high-efficiency synchronous buck converter product line, engineered specifically for low-voltage, high-current point-of-load regulation in space-constrained consumer electronics with stringent transient and thermal requirements.
FAQ
What is the minimum recommended output capacitance for stable operation?
The AP65450SP-13 requires ≥22μF total ceramic output capacitance with ≤10mΩ ESR to ensure loop stability and limit output voltage ripple to <25mV p-p at 4A load. Using multiple parallel 10μF X7R 0805 capacitors achieves both low impedance and thermal derating margin.
Can the AP65450SP-13 operate with a 3.3V input supply?
No - the absolute minimum input voltage is 4.5V per the datasheet's recommended operating conditions. At 3.3V, the UVLO circuit prevents startup (trip threshold = 3.45V), and internal gate drivers cannot sustain proper high-side MOSFET enhancement.
How does the bootstrap capacitor value affect reliability?
A 0.1μF ceramic capacitor between BS and SW is mandatory for reliable high-side gate drive. Values <0.082μF risk insufficient charge hold during extended ON times, causing high-side dropout and thermal stress; values >0.22μF delay bootstrap recharge and may reduce maximum duty cycle.
Is pre-biased start-up supported, and how is it enabled?
Yes - pre-biased start-up is inherent to the AP65450SP-13's architecture and requires no external components. When EN is asserted while VOUT is already biased, the controller disables the low-side MOSFET until FB reaches 0.76V, preventing reverse current flow into the output rail.
AP65450SP-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:
- 4A
- 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
AP65450SP-13 FAQ
1.How can I place an order for AP65450SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP65450SP-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 AP65450SP-13 reliable?
The price and inventory of AP65450SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP65450SP-13 is usually 5 days.
3.What payment methods are accepted for AP65450SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP65450SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP65450SP-13?
AP65450SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP65450SP-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 AP65450SP-13?
For technical support, including AP65450SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP65450SP-13 requirements.
6.How does Aetrix verify that AP65450SP-13 is sourced from the original manufacturer or authorized distributors?
All AP65450SP-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 AP65450SP-13 meets industry standards.
7.What is the process for return or replacement of AP65450SP-13?
All AP65450SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP65450SP-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 AP65450SP-13 part is unused and in its original packaging.
Return procedure for AP65450SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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