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Diodes Incorporated AP1506-33K5G-13
- Part No.:
- AP1506-33K5G-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1506-33K5G-13.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
AP1506-33K5G-13 from Diodes Incorporated is a monolithic 150kHz, 3A non-synchronous PWM buck DC/DC converter with fixed 3.3V output, integrated power switch, internal compensation, and thermal/current-limit protection. It operates from 4.5V to 22V input, delivers ±4% output voltage tolerance at 3.3V/3A, and uses a TO263-5 package for high-power density in industrial power supplies and embedded systems.
For engineers reviewing the AP1506-33K5G-13 datasheet, AP1506-33K5G-13 pinout, AP1506-33K5G-13 application, or AP1506-33K5G-13 equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for step-down regulator design and BOM continuity planning.
Technical Context
The AP1506-33K5G-13 implements voltage-mode PWM control with a fixed 150kHz ±15% oscillator, enabling compact LC filter design using standard 33µH inductors and low-ESR output capacitors. Its internal 3A N-channel MOSFET switch eliminates external transistor requirements.
Feedback is regulated via a precision 1.23V reference and FB pin sensing; shutdown is logic-controlled via the SD pin (0.6V threshold low, 2.0V+ high), reducing quiescent current to 70–150µA in standby. Thermal shutdown activates at +125°C junction temperature, and current limit triggers at 3.6–5.5A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% (3.168–3.432V) under 5.5–22V input and 0.2–3A load - ensures stable logic rail generation without external resistor network. |
| Switching Frequency | 150kHz ±15% (127–173kHz) - enables use of cost-effective, low-profile 33µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Max Output Current | 3A continuous - supports single-rail powering of microcontrollers, FPGAs, and peripheral ICs without external current boosting. |
| Input Voltage Range | 4.5V to 22V - accommodates wide-input industrial 12V/24V bus systems and battery-backed applications with brown-out margin. |
| Efficiency | 75% typical at VIN=12V, VOUT=3.3V, IOUT=3A - balances thermal performance and conversion loss in thermally constrained PCB layouts. |
| Shutdown Quiescent Current | 70–150µA at VIN=22V, SD=5V - enables ultra-low-power system sleep modes without auxiliary LDOs or discrete enable circuitry. |
| Thermal Resistance (θJA) | 37°C/W (TO263-5, 3in² copper) - defines minimum PCB copper area required to maintain TJ ≤125°C at full 3A load in still-air environments. |
Pinout & Package
AP1506-33K5G-13 uses the TO263-5 surface-mount package with exposed metal tab soldered to PCB ground plane for thermal conduction. The tab is electrically connected to GND (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply rail | Accepts 4.5–22V DC; requires local 100µF low-ESR input capacitor to suppress switching transients and supply peak currents. |
| 2 (Output) | Internal power switch drain | Swings between (VIN − VSAT ≈ 1.6V) and −0.5V; connects to inductor input - minimal copper area recommended to reduce EMI coupling. |
| 3 (GND) | Power and signal reference | Common return for internal circuits, feedback divider, and thermal path via exposed tab - must be low-impedance connection to PCB ground plane. |
| 4 (FB) | Output voltage feedback | Senses regulated 3.3V output via internal resistor divider; not user-accessible on fixed-output version - no external components required. |
| 5 (SD) | Logic-level shutdown control | Drives regulator ON when ≤0.6V (typ), OFF when ≥2.0V (typ); compatible with 3.3V/5V GPIOs - pulls to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A power switch | Eliminates external MOSFET and gate driver, reducing BOM count by ≥4 components and simplifying layout for space-constrained designs. |
| Internal compensation network | Enables stable regulation with only input/output capacitors and inductor - no external compensation components or stability analysis required. |
| Thermal shutdown + current limit | Protects against sustained overload and ambient overheating; current limit reduces switching frequency to 10–50kHz during fault, limiting power dissipation. |
| Logic-compatible shutdown (SD) | Supports direct interfacing with MCU GPIOs or system PMICs for coordinated power sequencing and low-power sleep states. |
| RoHS-compliant & halogen-free | Meets EU Directive 2011/65/EU and Diodes' "Green" standard (<900ppm Br/Cl, <1000ppm Sb) - suitable for automotive and industrial environmental compliance. |
Applications
| Industrial PLC Power Rails | Embedded Microcontroller Boards |
|---|---|
|
Use Scenario: Providing clean 3.3V power to ARM Cortex-M4/M7 MCUs, CAN transceivers, and ADCs in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V at up to 3A with tight line/load regulation and thermal robustness in sealed enclosures. Use Value: Enables single-stage conversion from 24V to 3.3V without intermediate 5V stage, reducing component count and improving overall system efficiency by ~8% versus two-stage solutions. |
Use Scenario: Powering SoC-based edge AI modules (e.g., NXP i.MX8M Mini) requiring stable 3.3V core I/O rails in fanless IoT gateways deployed in ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: High-current buck regulator with logic-controlled shutdown for dynamic power gating of peripheral subsystems during idle cycles. Use Value: Achieves 75% efficiency at full 3A load while maintaining junction temperature ≤115°C on 2oz copper PCB - avoids need for heatsinks or forced airflow. |
| Point-of-Load Converters | Legacy System Voltage Translation |
|
Use Scenario: Generating localized 3.3V supplies for FPGA I/O banks or high-speed SerDes interfaces on dense backplane cards where board space is limited. IC Role / Device Role / Timing Role: Compact, self-contained buck converter minimizing trace inductance and noise coupling through integrated switch and optimized pinout. Use Value: TO263-5 package with GND-tab thermal path achieves 37°C/W θJA - allows 3A operation with <20°C temperature rise over ambient on standard 4-layer boards. |
Use Scenario: Replacing aging linear regulators (e.g., LM393) in legacy test equipment requiring efficient 3.3V conversion from existing 12V internal rails. IC Role / Device Role / Timing Role: Drop-in replacement for inefficient 12V→3.3V linear solutions, reducing heat sink size and enabling higher channel density. Use Value: Reduces power dissipation from >25W (linear) to <3W (switching) at 3A - eliminates thermal derating and enables retrofit into space- and airflow-constrained chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 40V max input, 1.5MHz switching, adjustable-only output - requires external resistors for 3.3V setting; higher frequency enables smaller magnetics but increases EMI filtering complexity. | Preferred for high-input-voltage (>24V) or space-critical designs needing sub-3mm inductors; unsuitable for noise-sensitive analog sections without added filtering. | Select when input exceeds 22V or board area is constrained; verify FB divider accuracy and loop stability with external compensation. |
| LM2678SX-3.3/NOPB (Texas Instruments) | 40V max input, 260kHz fixed frequency, 5A rating, TO263-5 package - higher current capability and wider VIN range, but larger thermal footprint and no integrated SD logic interface. | Better suited for 5A peak loads or 36V industrial inputs; lacks dedicated shutdown pin - requires external transistor or level shifter for MCU control. | Choose for higher current headroom or extended input range; add discrete enable circuitry and re-evaluate thermal layout due to higher θJA (42°C/W). |
Compared with MP1584EN-LF-Z and LM2678SX-3.3/NOPB, the AP1506-33K5G-13 offers optimal balance of integration (fixed 3.3V, built-in SD), thermal performance (37°C/W), and compatibility with legacy 12V/24V systems - making it ideal for cost-sensitive, thermally constrained industrial power designs where simplicity and reliability are prioritized over ultra-high frequency or extreme input range.
Availability
AP1506-33K5G-13 is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller boards, and point-of-load converters requiring stable component supply with long-term lifecycle support and traceable green sourcing.
Supply support for AP1506-33K5G-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-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1506 series belongs to Diodes' monolithic DC/DC converter product line, designed specifically for cost-effective, high-current step-down regulation in space- and thermal-constrained industrial and embedded applications - emphasizing integration, ruggedness, and ease of use.
FAQ
What is the maximum recommended input voltage for AP1506-33K5G-13?
The absolute maximum input voltage is +24V, but the recommended operating range is 4.5V to 22V per the datasheet. Operation above 22V risks exceeding internal transistor breakdown limits and invalidates guaranteed performance specs like output voltage tolerance and efficiency. For 24V nominal systems, ensure transient suppression or pre-regulation to keep steady-state VIN ≤22V.
Can AP1506-33K5G-13 be used in adjustable-output configurations?
No - the AP1506-33K5G-13 is a factory-trimmed fixed 3.3V output variant. Its FB pin is internally connected to a precision resistor divider; external feedback components cannot modify the output voltage. For adjustable operation, select AP1506-K5G-13 (ADJ version), which exposes the FB node for external resistor programming.
What thermal considerations apply to the TO263-5 package in continuous 3A operation?
With 3A load and 12V input, the TO263-5 package requires ≥3in² of 2oz copper connected to the GND tab to maintain junction temperature ≤125°C in still air. Derating is necessary above +60°C ambient; adding airflow or doubling copper area reduces θJA to ~28°C/W. Avoid large copper pours on the Output (Pin 2) to minimize EMI coupling.
Is AP1506-33K5G-13 pin-compatible with other AP1506 variants in TO263-5?
Yes - all AP1506 versions (3.3V, 5V, 12V, ADJ) in TO263-5 share identical pinout, package dimensions, and thermal pad layout. This enables drop-in replacement across output voltages during prototyping or BOM optimization, provided input voltage and load requirements remain within each variant's specified operating conditions.
AP1506-33K5G-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1506-33K5G-13 FAQ
1.How can I place an order for AP1506-33K5G-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1506-33K5G-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 AP1506-33K5G-13 reliable?
The price and inventory of AP1506-33K5G-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1506-33K5G-13 is usually 5 days.
3.What payment methods are accepted for AP1506-33K5G-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1506-33K5G-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1506-33K5G-13?
AP1506-33K5G-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1506-33K5G-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 AP1506-33K5G-13?
For technical support, including AP1506-33K5G-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1506-33K5G-13 requirements.
6.How does Aetrix verify that AP1506-33K5G-13 is sourced from the original manufacturer or authorized distributors?
All AP1506-33K5G-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 AP1506-33K5G-13 meets industry standards.
7.What is the process for return or replacement of AP1506-33K5G-13?
All AP1506-33K5G-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1506-33K5G-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 AP1506-33K5G-13 part is unused and in its original packaging.
Return procedure for AP1506-33K5G-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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