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Diodes Incorporated AP1506-33K5L-13
- Part No.:
- AP1506-33K5L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1506-33K5L-13.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,606
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Product details
Overview
AP1506-33K5L-13 from Diodes Incorporated is a fixed-output 3.3V, 3A monolithic PWM buck DC/DC converter in TO263-5 package with integrated 150kHz oscillator, internal compensation, thermal shutdown, and current-limit protection. It operates from 4.5V to 22V input, delivers ±4% output voltage tolerance at full load, and supports logic-level ON/OFF control via SD pin for low-power standby mode. Used in on-card switching regulators requiring compact, high-efficiency step-down conversion.
For engineers reviewing the AP1506-33K5L-13 datasheet, AP1506-33K5L-13 pinout, AP1506-33K5L-13 application, or AP1506-33K5L-13 equivalent, key selection criteria include guaranteed 3.3V ±4% output accuracy at 3A, 150kHz fixed-frequency operation enabling small external filter components, integrated switch transistor eliminating external FET, thermal shutdown and cycle-by-cycle current limiting, and TO263-5 package with exposed metal tab for enhanced thermal dissipation.
Technical Context
The AP1506-33K5L-13 implements voltage-mode non-synchronous PWM control with an internal 150kHz ±15% oscillator and built-in error amplifier with 1.23V reference. Feedback is sampled at the FB pin, where regulation is achieved by comparing a resistor-divided output voltage against the internal reference.
It features cycle-by-cycle current limiting triggered when peak switch current exceeds 3.6–5.5A, reducing switching frequency to ~10–50kHz under short-circuit conditions. Thermal shutdown activates at junction temperatures exceeding +125°C, and the SD pin provides TTL/CMOS-compatible enable/disable control with 0.6V low-threshold and 2.0V high-threshold logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% (3.168–3.432V) across 0.2–3A load and -20°C to +85°C ambient. |
| Switching Frequency | 150kHz ±15% (127–173kHz), enabling use of smaller inductors (e.g., 33µH) and output capacitors. |
| Max Output Current | 3A continuous load capability with integrated N-channel MOSFET switch and on-chip current sensing. |
| Input Voltage Range | 4.5V to 22V - supports wide industrial input rails including 5V, 12V, and 24V systems. |
| Efficiency | 75% typical at VIN=12V, VOUT=3.3V, IOUT=3A - optimized for mid-power buck conversion with minimal external parts. |
| Shutdown Quiescent Current | 70–150µA in standby mode (SD = high), enabling ultra-low power-off state for battery-sensitive designs. |
| Thermal Resistance (θJA) | 37°C/W (TO263-5, 3in² copper), allowing ~3A operation up to +85°C ambient with proper PCB layout. |
Pinout & Package
AP1506-33K5L-13 uses the TO263-5 surface-mount package with exposed metal tab (GND-connected) for thermal conduction. Recommended minimum PCB copper area: 0.8 in² (2 oz), ideally ≥2 in² for full 3A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Positive input supply | Accepts 4.5–22V DC; requires local ceramic bypass capacitor (≥100µF) to handle high di/dt switching currents. |
| 2 Output | Internal power switch drain | Swings between (VIN − VSAT ≈ 1.6V) and −0.5V; connects to inductor input - minimize copper area to reduce EMI coupling. |
| 3 GND | Power and signal ground | Common return for internal circuitry, feedback network, and thermal path via exposed tab soldered to PCB copper. |
| 4 FB | Voltage feedback input | Senses output via resistor divider; internal 1.23V reference enables precise regulation - no external compensation needed. |
| 5 SD | Shutdown control input | Logic-compatible enable: <0.6V = ON, >2.0V = OFF; pulls total supply current to ≤150µA in shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | On-die N-MOSFET eliminates need for external transistor - reduces BOM count and board space. |
| Internal compensation | Eliminates external compensation network - simplifies design and improves stability across line/load variations. |
| Current-limit protection | Peak current limit (3.6–5.5A) with automatic frequency foldback during overload - prevents damage without external sensing. |
| Thermal shutdown | Auto-recovery protection triggers at TJ > +125°C - ensures safe operation under sustained overload or poor heatsinking. |
| Lead-free & green compliance | Fully RoHS 3 compliant (≤900ppm Br/Cl, ≤1000ppm Sb); halogen- and antimony-free per Diodes' "Green" definition. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Local 3.3V rail generation from 12V vehicle battery for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 3.3V/3A output with thermal robustness for under-hood environments. Use Value: Eliminates need for external MOSFET and compensation components - reduces footprint and improves reliability over discrete solutions. |
Use Scenario: Compact 3.3V supply for infotainment system logic boards operating from 12V nominal automotive input. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering regulated power with built-in current limiting and thermal protection. Use Value: 75% efficiency at 3A load minimizes heat rise in confined enclosures; SD pin enables controlled power sequencing. |
| Industrial PLC I/O Module | Networking Equipment Board Power |
|
Use Scenario: On-card 3.3V supply for digital I/O drivers and isolation interface ICs in programmable logic controllers. IC Role / Device Role / Timing Role: High-current DC/DC regulator supporting transient-heavy loads with fast response due to internal compensation. Use Value: ±4% output tolerance ensures reliable logic-level compatibility; TO263-5 package allows direct thermal coupling to PCB plane. |
Use Scenario: Secondary 3.3V rail generation from intermediate 5V or 12V bus in Ethernet switch or router line cards. IC Role / Device Role / Timing Role: Efficient, low-noise buck converter powering FPGA configuration, PHY, and management MCU subsystems. Use Value: 150kHz fixed frequency avoids sensitive communication bands; low standby current (<150µA) supports energy-efficient sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z | 40V max input, 1.8–28V adjustable output, 3A, 1.5MHz switching frequency. | Higher frequency enables smaller magnetics but increases EMI sensitivity; no fixed 3.3V option - requires external resistors. | Select when higher input voltage range (>22V) or faster transient response is required; rework needed for fixed 3.3V. |
| LM2596S-3.3 | 40V max input, fixed 3.3V, 3A, 150kHz, but requires external compensation and has looser ±2% initial tolerance only at 25°C. | Lacks integrated current-limit foldback and thermal shutdown auto-recovery; lower efficiency (~70%) at full load. | Choose for cost-sensitive legacy designs where tighter output tolerance and robust protection are secondary priorities. |
Compared with MP1584EN-LF-Z and LM2596S-3.3, the AP1506-33K5L-13 offers superior output accuracy (±4% over full temp/load), guaranteed thermal shutdown recovery, and zero-compensation design - making it optimal for space-constrained industrial and automotive applications demanding predictable, maintenance-free operation.
Availability
AP1506-33K5L-13 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, networking line cards, and embedded computing systems requiring stable component supply with known lifecycle status.
Supply support for AP1506-33K5L-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, automotive, and consumer markets.
The AP1506 series belongs to Diodes' monolithic DC/DC converter product line, designed specifically for cost-effective, board-space-efficient buck regulation in applications where simplicity, thermal resilience, and minimal external component count are critical.
FAQ
What is the maximum recommended input voltage for AP1506-33K5L-13?
The absolute maximum input voltage is +24V, but the recommended operating range is 4.5V to 22V. Operation above 22V risks exceeding internal transistor breakdown limits and may trigger premature thermal shutdown. For 24V nominal systems, ensure transient clamping or pre-regulation to maintain VIN ≤22V under all conditions.
Does AP1506-33K5L-13 require external compensation components?
No - the AP1506-33K5L-13 integrates full compensation circuitry, eliminating the need for external RC networks. This simplifies layout, improves stability across temperature and load, and reduces bill-of-materials cost. Only input/output capacitors, inductor, and catch diode are required for basic operation.
How does the current-limit protection behave during overload?
When peak switch current exceeds 3.6–5.5A, the AP1506-33K5L-13 enters current-limit mode and reduces switching frequency from 150kHz to 10–50kHz. If FB voltage drops below 0.5V, frequency foldback activates to limit power dissipation - preventing thermal runaway while maintaining regulation under moderate overload.
Can AP1506-33K5L-13 be used in automotive applications?
While AP1506-33K5L-13 meets AEC-Q200 passive stress requirements and operates across -40°C to +125°C junction temperature, it is not AEC-Q100 qualified. For production automotive ECUs, Diodes recommends contacting their automotive team for PPAP-capable, IATF 16949-manufactured alternatives with full qualification documentation.
AP1506-33K5L-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
AP1506-33K5L-13 FAQ
1.How can I place an order for AP1506-33K5L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1506-33K5L-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 AP1506-33K5L-13 reliable?
The price and inventory of AP1506-33K5L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1506-33K5L-13 is usually 5 days.
3.What payment methods are accepted for AP1506-33K5L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1506-33K5L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1506-33K5L-13?
AP1506-33K5L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1506-33K5L-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 AP1506-33K5L-13?
For technical support, including AP1506-33K5L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1506-33K5L-13 requirements.
6.How does Aetrix verify that AP1506-33K5L-13 is sourced from the original manufacturer or authorized distributors?
All AP1506-33K5L-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 AP1506-33K5L-13 meets industry standards.
7.What is the process for return or replacement of AP1506-33K5L-13?
All AP1506-33K5L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1506-33K5L-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 AP1506-33K5L-13 part is unused and in its original packaging.
Return procedure for AP1506-33K5L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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