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Diodes Incorporated AP6503SP-13
- Part No.:
- AP6503SP-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AP6503SP-13.pdf
- Description:
- IC REG BUCK ADJ 3A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
AP6503SP-13 from Diodes Incorporated is a 340 kHz, 4.7–23 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 consumer electronics and FPGA/DSP supplies.
For engineers reviewing the AP6503SP-13 datasheet, AP6503SP-13 pinout, AP6503SP-13 application, or AP6503SP-13 equivalent, key selection considerations include its current-mode control architecture, programmable soft-start (6 µA internal current source), enable threshold (0.7–0.9 V rising), thermal shutdown at +160 °C, and SO-8EP package with exposed thermal pad.
Technical Context
The AP6503SP-13 implements fixed-frequency (340 kHz) current-mode control with slope compensation to suppress subharmonic oscillation, enabling fast transient response and stable loop design across wide duty cycles. Its error amplifier features 800 V/V gain and 1000 µA/V transconductance, interfacing externally via the COMP pin for pole-zero tuning.
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 at 3.3 VOUT), 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 | 4.7 V to 23 V - supports wide-input industrial and consumer rails including 12 V and 19 V adapters. |
| Output Current | 3 A continuous - sufficient for powering mid-power FPGAs, DSPs, and SoCs without external heatsinking under typical PCB layout. |
| Switching Frequency | 340 kHz (±12%) - balances EMI performance and inductor size; enables use of standard 10 µH shielded inductors. |
| Feedback Reference | 0.925 V (±25 mV) - sets output accuracy; allows precise regulation down to sub-1 V with minimal resistor tolerance impact. |
| RDS(ON) | 100 mΩ high-side & 100 mΩ low-side - minimizes conduction loss; enables >90% efficiency at 2 A load with 12 VIN/3.3 VOUT. |
| Thermal Shutdown | +160 °C with +40 °C hysteresis - protects die during overload or poor thermal design; re-enables after cooling to ~120 °C. |
| Soft-Start Current | 6 µA - sets ramp time with external capacitor (e.g., 0.1 µF → 15 ms); prevents inrush-induced input rail sag or output overshoot. |
Pinout & Package
AP6503SP-13 is housed in a Green SO-8EP package (5.0 mm × 6.0 mm × 1.75 mm) with exposed thermal pad (EP) electrically connected to Pin 4 (GND), enabling low θJA = 74 °C/W on 1″² 1 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | High-side gate drive bootstrap supply | Requires ≥0.01 µF ceramic capacitor from BST to SW to sustain high-side MOSFET turn-on; critical for duty cycle >70%. |
| IN (Pin 2) | Main power input | Accepts 4.7–23 V; must be bypassed with ≥22 µF low-ESR capacitor to GND to suppress switching noise and support peak current demands. |
| SW (Pin 3) | Power switching node | Connects to inductor input; carries high di/dt; requires short, low-inductance trace to minimize EMI and voltage spikes. |
| GND (Pin 4) | Power and signal ground | Primary return path; exposed EP must be soldered to large GND copper area for thermal and electrical integrity. |
| FB (Pin 5) | Output voltage feedback input | Senses resistive divider output; regulated to 0.925 V; bias current <60 nA ensures accuracy with high-value dividers. |
| COMP (Pin 6) | Error amplifier output / loop compensation node | Interfaces with external RC network (e.g., 6.8 kΩ + 6.8 nF) to set dominant pole and zero for stable 340 kHz operation. |
| EN (Pin 7) | Enable control input | Active-high logic interface; 0.7–0.9 V threshold enables startup; 2.2–2.7 V lockout range provides noise immunity. |
| SS (Pin 8) | Soft-start timing control | Internal 6 µA current charges external capacitor; floating disables soft-start; 0.1 µF yields 15 ms ramp to full output. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 100 mΩ HS + 100 mΩ LS - eliminates external switch selection, reduces BOM count, and simplifies layout for compact 3 A converters. |
| Current-mode control with slope compensation | Stabilizes loop across 0–90% duty cycle - avoids subharmonic oscillation at light loads and enables single-pole compensation design. |
| Programmable soft-start | 6 µA internal current source - allows precise control of output ramp rate via capacitor value, preventing inrush into downstream capacitance. |
| Comprehensive protection suite | OCP (cycle-by-cycle + foldback), thermal shutdown (+160 °C), UVLO (4.05 V), and OVP (1.1 V FB trip) - enables robust operation in unattended consumer systems. |
| SO-8EP thermal package | Exposed EP tied to GND - delivers 16 °C/W junction-to-case resistance, supporting 3 A continuous operation without forced air on standard 2-layer PCBs. |
Applications
| Gaming Console Power Rails | FPGA Core Supply |
|---|---|
|
Use Scenario: Regulating 12 V adapter input to 1.2 V or 1.8 V core voltage for GPU and CPU subsystems in compact gaming consoles. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with current-mode control ensuring fast load-step response during burst-mode graphics processing. Use Value: 3 A continuous capability and 95% peak efficiency reduce thermal load in sealed enclosures; SO-8EP package enables dense board layout. |
Use Scenario: Providing clean, tightly regulated 1.2 V or 2.5 V supply to Xilinx or Intel FPGA core banks with dynamic current demand up to 2.5 A. IC Role / Device Role / Timing Role: Adjustable-output buck converter with 0.925 V reference and low FB bias current enabling high-accuracy voltage setting using standard 1% resistors. Use Value: Programmable soft-start prevents configuration errors during FPGA configuration; COMP pin allows fine-tuning for optimal transient response under varying load profiles. |
| Flat Panel TV Backlight Driver Support | Distributed Audio System Rails |
|
Use Scenario: Generating 5 V or 12 V intermediate bus for LED backlight driver ICs in 4K UHD TVs, where space and thermal constraints are tight. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from main 23 V supply, delivering stable 5 V/3 A to boost controllers and PWM dimming circuits. Use Value: 23 V max input rating matches TV power architectures; 340 kHz switching frequency avoids audible noise while enabling small magnetics. |
Use Scenario: Powering digital audio processors, DACs, and Class-D amplifiers in multi-zone home audio systems requiring isolated, low-noise 3.3 V and 5 V rails. IC Role / Device Role / Timing Role: Synchronous buck regulator with low quiescent current (0.6 mA typ.) and EN pin enabling system-level power sequencing and standby mode control. Use Value: Thermal shutdown and OVP protect sensitive audio components from fault propagation; RoHS/Green compliance meets global consumer safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LSP5523 | Successor part: 500 kHz switching, 4.5–24 V input, 4 A continuous, RDS(ON) = 65 mΩ HS/45 mΩ LS, integrated soft-start timer. | Higher frequency enables smaller LC filter; higher current rating supports next-gen SoCs; not pin-compatible with AP6503SP-13. | Select LSP5523 for new designs requiring improved efficiency, smaller footprint, or higher output current; requires PCB redesign. |
| AP6502SP-13 | Lower-current variant: same 340 kHz, 4.7–23 V input, but rated for 2 A continuous output and 120 mΩ MOSFETs. | Reduced thermal margin and lower peak efficiency (92% vs. 95%) at 3 A; identical pinout and compensation scheme. | Consider AP6502SP-13 only for cost-sensitive, lower-load applications where 2 A suffices and thermal headroom is available. |
Compared with AP6503SP-13, LSP5523 offers higher frequency and current capability but requires layout changes, while AP6502SP-13 retains pin compatibility at reduced performance-making the original suitable only for legacy repair or exact form-fit replacement where obsolescence risk is managed.
Availability
AP6503SP-13 is available at Aetrix Electronics and suitable for gaming console power rails, FPGA core supplies, and flat-panel TV intermediate buses requiring stable component supply despite its obsolete status.
Supply support for AP6503SP-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-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP6503SP-13 belongs to Diodes' AP65xx synchronous buck converter family, designed specifically for space-constrained, high-efficiency DC/DC conversion in consumer electronics and distributed power architectures.
FAQ
Is AP6503SP-13 still in active production?
No-AP6503SP-13 is officially obsolete and discontinued by Diodes Incorporated as of December 2023. It is no longer manufactured, though limited legacy stock may be available through authorized distributors and Aetrix Electronics for last-time buys and repair fulfillment.
What is the recommended replacement for AP6503SP-13?
Diodes Incorporated recommends the LSP5523 as the direct functional successor. It offers higher switching frequency (500 kHz), increased output current (4 A), lower RDS(ON), and integrated soft-start timing-but requires PCB layout changes due to non-pin-compatibility and different compensation requirements.
Can AP6503SP-13 operate at 23 V input continuously?
Yes-the absolute maximum input voltage is +26 V, and the recommended operating range extends to 23 V. At 23 V input and 3.3 V output, it delivers 3 A continuously with thermal derating; SO-8EP's θJA = 74 °C/W requires adequate copper pour and airflow for sustained operation.
How does the AP6503SP-13 handle overcurrent conditions?
It employs cycle-by-cycle peak current limiting (5.5 A typical at 3.3 VOUT) and valley current limiting (0.9 A), with foldback frequency reduction to 100 kHz when FB drops to 0.3 V. This limits average power dissipation during sustained overload while maintaining safe thermal margins.
AP6503SP-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):
- 4.7V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 0.925V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO-EP
AP6503SP-13 FAQ
1.How can I place an order for AP6503SP-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP6503SP-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 AP6503SP-13 reliable?
The price and inventory of AP6503SP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP6503SP-13 is usually 5 days.
3.What payment methods are accepted for AP6503SP-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP6503SP-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP6503SP-13?
AP6503SP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP6503SP-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 AP6503SP-13?
For technical support, including AP6503SP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP6503SP-13 requirements.
6.How does Aetrix verify that AP6503SP-13 is sourced from the original manufacturer or authorized distributors?
All AP6503SP-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 AP6503SP-13 meets industry standards.
7.What is the process for return or replacement of AP6503SP-13?
All AP6503SP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP6503SP-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 AP6503SP-13 part is unused and in its original packaging.
Return procedure for AP6503SP-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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