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Diodes Incorporated AP6503ASP-13
- Part No.:
- AP6503ASP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP6503ASP-13.pdf
- Description:
- IC REG BUCK ADJ 3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
AP6503ASP-13 from Diodes Incorporated is a 240 kHz, 4.75–23 V input, synchronous DC/DC buck converter with integrated 100 mΩ high-side and low-side MOSFETs, delivering up to 3 A continuous output current at 12 VIN/3.3 VOUT, 95% peak efficiency, and 0.925 V feedback reference voltage. It serves as a primary step-down regulator in distributed power systems for FPGA, DSP, and consumer electronics.
For engineers reviewing the AP6503ASP-13 datasheet, AP6503ASP-13 pinout, AP6503ASP-13 application, or AP6503ASP-13 equivalent, key selection considerations include its external compensation architecture, programmable soft-start (6 µA current source), current-mode control for fast transient response, and thermal shutdown at +160°C with hysteresis.
Technical Context
The AP6503ASP-13 implements fixed-frequency (240 kHz) current-mode control with slope compensation to suppress subharmonic oscillation. Its error amplifier features 800 V/V gain and 1000 µA/V transconductance, interfacing externally via the COMP pin for loop stabilization using an RC network.
It integrates dual N-channel MOSFETs (RDS(ON) = 100 mΩ each), supports adjustable output from 0.925 V to 20 V via resistive divider, and includes cycle-by-cycle OCP with valley current limit (0.9 A) and peak current limit (5.5 A), plus UVLO (4.05 V rising threshold) and overvoltage protection (1.1 V FB trip).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75 V to 23 V - Supports wide-input industrial and consumer rails including 5 V, 12 V, and 19 V adapters. |
| Output Current | 3 A continuous - Sustains full load at 12 VIN/3.3 VOUT with <95% efficiency; peak capability 5.5 A for short transients. |
| Switching Frequency | 240 kHz (±12.5 kHz) - Enables use of standard 10 µH inductors and balances EMI vs. efficiency trade-offs. |
| Feedback Reference | 0.925 V (±25 mV) - Sets output voltage accuracy; enables precise regulation down to sub-1 V for core supplies. |
| Thermal Shutdown | +160°C activation with ~40°C hysteresis - Protects die during sustained overload or poor PCB thermal design. |
| Soft-Start Current | 6 µA - Allows predictable 15 ms ramp time with 0.1 µF capacitor; resets on EN deassertion or thermal fault. |
| Oscillator Foldback | 80 kHz under overcurrent - Reduces switching losses and limits runaway current during fault conditions. |
Pinout & Package
AP6503ASP-13 is housed in a Green SO-8EP package with exposed thermal pad (EP), optimized for PCB heat dissipation (θJA = 74°C/W). The EP must be soldered to Pin 4 (GND) for electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | High-side gate drive boost supply | Requires ≥0.01 µF capacitor from SW to BST to sustain high-side MOSFET gate drive above VIN. |
| SW (Pin 2) | Power switching node | Connects to inductor input; carries high di/dt ripple; requires tight layout and low-inductance output filter. |
| GND (Pin 3) | Power and signal ground reference | Primary return path for power switches and analog circuitry; EP must connect directly to this pin. |
| FB (Pin 5) | Output voltage sensing input | Monitors resistive divider output; 0.925 V reference sets regulation point; sensitive to noise coupling. |
| COMP (Pin 6) | Error amplifier output compensation node | External RC network (e.g., 6.8 kΩ + 6.8 nF) shapes loop stability and transient response. |
| EN (Pin 7) | Enable control with lockout hysteresis | Turns regulator on above 2.5 V; disables below 1.98 V; internal 100 kΩ pull-up enables auto-start. |
| SS (Pin 8) | Soft-start timing control | Capacitor to GND sets ramp duration; floating disables soft-start; resets on fault or EN toggle. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Dual 100 mΩ N-MOSFETs eliminate external switch selection and reduce board area by >30% vs. controller-only solutions. |
| Current-Mode Control | Enables single-loop compensation, inherent line/load regulation, and >100 kHz bandwidth for <10 µs load-step recovery. |
| Programmable Soft-Start | 6 µA internal current source allows precise output voltage ramp control to prevent inrush and overshoot. |
| Fault Protection Suite | OCP (cycle-by-cycle + foldback), thermal shutdown (+160°C), UVLO (4.05 V), and OVP (1.1 V FB) ensure robust system-level reliability. |
| Green SO-8EP Package | RoHS-compliant, halogen-free, with exposed pad for direct thermal path to PCB-reduces junction-to-ambient rise by ~40%. |
Applications
| Gaming Console Power Rails | FPGA Core Supply |
|---|---|
|
Use Scenario: Regulating 12 V adapter input to 1.2 V/3 A for GPU memory interface in compact gaming consoles. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with current-mode loop for dynamic load handling during frame rendering bursts. Use Value: 95% efficiency minimizes thermal load in sealed enclosures; 240 kHz switching avoids audible noise while enabling small 3.3 µH inductors. |
Use Scenario: Generating stable 1.8 V/2.5 A core voltage for Xilinx Artix-7 FPGA in industrial control modules. IC Role / Device Role / Timing Role: Adjustable-output buck converter with 0.925 V reference and external compensation for tight ±2% output tolerance. Use Value: Programmable soft-start prevents configuration corruption during power-up; thermal shutdown protects against ambient +85°C operation. |
| Flat Panel TV Backlight Driver Bias | Set-Top Box SoC Supply |
|
Use Scenario: Providing 5 V/2 A bias rail for LED driver ICs in 4K LCD TV main boards with space-constrained layouts. IC Role / Device Role / Timing Role: High-integration buck converter reducing BOM count-replaces discrete MOSFETs, drivers, and compensation components. Use Value: SO-8EP package with exposed pad maintains <85°C junction temp under continuous load; 4.75–23 V input accommodates varied AC/DC adapters. |
Use Scenario: Delivering 3.3 V/3 A to Broadcom BCM72xx SoC in cable set-top boxes requiring low standby current and fast wake-up. IC Role / Device Role / Timing Role: Enable-controlled buck regulator supporting deep-sleep modes with 0.3 µA shutdown current. Use Value: EN pin lockout hysteresis (220 mV) prevents chatter near threshold; 240 kHz frequency eases EMI filtering for FCC Class B compliance. |
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) | 36 V max input, 0.8 V ref, 2 A continuous, no BST pin - uses bootstrap diode instead of capacitor. | Limited to ≤2 A loads; lacks programmable soft-start; lower VIN range unsuitable for 23 V systems. | Select only if input ≤36 V and load ≤2 A; verify bootstrap diode placement and thermal derating. |
| TPS54302DDCR (Texas Instruments) | 6 V min input, 3 A, 0.8 V ref, integrated compensation - no external COMP pin required. | Cannot operate below 6 V; fixed compensation reduces tuning flexibility for custom LC filters. | Prefer for 12 V-only systems where simplified layout outweighs need for adaptive loop tuning. |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the AP6503ASP-13 uniquely supports 4.75–23 V input, offers external COMP for precision loop shaping, and delivers 3 A with 5.5 A peak current-making it optimal for multi-rail consumer electronics where input variability and transient robustness are critical.
Availability
AP6503ASP-13 is available at Aetrix Electronics and suitable for gaming consoles, flat-panel TVs, and set-top boxes requiring stable component supply despite its obsolete status-inventory is secured through authorized channel redistribution and legacy program support.
Supply support for AP6503ASP-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 devices for high-volume industrial and consumer markets.
The AP6503A belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for space-constrained, thermally demanding applications in consumer electronics and distributed power architectures.
FAQ
Is AP6503ASP-13 still in production?
No-AP6503ASP-13 is officially discontinued per Diodes Incorporated's DS36000 Rev. 5-4 (July 2021). However, Aetrix Electronics maintains active inventory through authorized legacy distribution channels and provides full traceability, lot documentation, and extended lifecycle support for ongoing production programs.
What is the minimum input voltage for reliable startup?
The AP6503ASP-13 requires ≥4.75 V at the IN pin for normal operation, with undervoltage lockout releasing at 4.05 V (rising threshold). Startup is guaranteed only when input exceeds 4.75 V and EN is pulled above 2.5 V; below 4.05 V, both MOSFETs remain off.
Can the AP6503ASP-13 regulate output voltages below 1 V?
No-the feedback reference is fixed at 0.925 V, and the datasheet specifies a minimum output of 0.925 V. Output voltages below this value cannot be regulated; attempting to set VOUT < 0.925 V results in uncontrolled dropout or instability due to error amplifier saturation.
How does the BST capacitor affect high-side gate drive?
A ≥0.01 µF ceramic capacitor between BST and SW provides charge storage to maintain gate voltage above the source for the high-side MOSFET during conduction. Insufficient capacitance causes gate drive collapse, increased RDS(ON), and thermal failure-especially at high duty cycles or elevated temperatures.
AP6503ASP-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):
- 4.75V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.925V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3A
- Frequency - Switching:
- 240kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP6503ASP-13 FAQ
1.How can I place an order for AP6503ASP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP6503ASP-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 AP6503ASP-13 reliable?
The price and inventory of AP6503ASP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP6503ASP-13 is usually 5 days.
3.What payment methods are accepted for AP6503ASP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP6503ASP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP6503ASP-13?
AP6503ASP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP6503ASP-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 AP6503ASP-13?
For technical support, including AP6503ASP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP6503ASP-13 requirements.
6.How does Aetrix verify that AP6503ASP-13 is sourced from the original manufacturer or authorized distributors?
All AP6503ASP-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 AP6503ASP-13 meets industry standards.
7.What is the process for return or replacement of AP6503ASP-13?
All AP6503ASP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP6503ASP-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 AP6503ASP-13 part is unused and in its original packaging.
Return procedure for AP6503ASP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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