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Diodes Incorporated AP1507-33D5L-13
- Part No.:
- AP1507-33D5L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-6, DPAK (5 Leads + Tab)
- Datasheet:
-
AP1507-33D5L-13.pdf
- Description:
- IC REG BUCK 3.3V 3A TO252-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
AP1507-33D5L-13 from Diodes Incorporated is a fixed-output 3.3V, 3A non-synchronous PWM buck DC/DC converter in TO-252-5L package, integrating a power switch and internal compensation. It operates at 150kHz (±15%), delivers ±4% output voltage accuracy under load and input variation, and includes thermal shutdown, current limiting, and logic-level ON/OFF control. Used in embedded power rails requiring compact, low-component-count 3.3V regulation from 5.5–22V inputs.
For engineers reviewing the AP1507-33D5L-13 datasheet, AP1507-33D5L-13 pinout, AP1507-33D5L-13 application, or AP1507-33D5L-13 equivalent, key selection criteria include fixed 3.3V output tolerance, 3A continuous load capability, TO-252 thermal performance with 50°C/W θJA, and shutdown quiescent current of 70–200µA.
Technical Context
The AP1507-33D5L-13 implements voltage-mode PWM control with an internal 1.235V reference and 150kHz oscillator. Its feedback loop uses a single-resistor divider (not required for fixed 3.3V version) and relies on built-in compensation to achieve ±0.5% line regulation and ±1% load regulation across temperature.
Protection functions include cycle-by-cycle current limiting (trip threshold 3.6–5.5A), thermal shutdown at ~150°C junction temperature, and reduced switching frequency (10–50kHz) during overload to limit power dissipation. The SD pin accepts 0–18V logic-level signals to enable/disable regulation with <200nA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 0.2–3A load and 5.5–22V input; ensures stable logic rail without external resistor network. |
| Switching Frequency | 150kHz ±15%; enables use of smaller 33µH inductors and reduces EMI compared to lower-frequency buck regulators. |
| Continuous Output Current | 3A; supports microcontroller cores, FPGAs, and interface ICs without external MOSFET or heatsink under typical PCB copper area. |
| Input Voltage Range | 4.5V to 22V; compatible with 5V, 12V, and 24V industrial bus supplies while maintaining regulation down to 5.5V for 3.3V output. |
| Efficiency | 75% at VIN=12V, IOUT=3A; balances thermal performance and conversion loss in space-constrained applications. |
| Shutdown Quiescent Current | 70–200µA; minimizes standby power in battery-backed or energy-sensitive systems. |
| Thermal Resistance | θJA = 50°C/W (TO-252-5L on 2cm² 2oz copper); defines maximum power dissipation before thermal shutdown under ambient conditions. |
Pinout & Package
AP1507-33D5L-13 is housed in a lead-free, RoHS-compliant TO-252-5L surface-mount package with exposed metal tab (Pin 2) connected to GND for thermal conduction. The 5-pin layout supports high-current switching with minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 4.5–22V DC; requires local 100µF+ ceramic + bulk capacitor to handle 3A switching transients. |
| 2 (Output) | Switch Node | Drives external Schottky diode and inductor; voltage swings between (VIN – 1.6V) and –0.5V; minimize copper area to reduce EMI coupling. |
| 3 (GND) | Power Ground | Common return for internal circuitry and thermal path; must be tied directly to large copper pour under package tab. |
| 4 (FB) | Feedback Input | Internally connected to 3.3V divider; unused in fixed-output version but must remain unconnected or grounded per datasheet guidance. |
| 5 (SD) | Shutdown Control | Logic-compatible enable: <1.3V = ON, >2.0V = OFF; draws <0.1µA in active state and <200nA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch | On-chip 3A DMOS transistor eliminates need for external high-side switch, reducing BOM count and layout complexity. |
| Internal Compensation | Single-pole compensation network enables stable operation with standard output capacitors-no external RC network required. |
| Thermal Shutdown Protection | Activates at ~150°C junction temperature and holds regulator off until die cools by ~20°C, preventing permanent damage. |
| Current Limit with Frequency Foldback | Reduces switching frequency to 10–50kHz when VFB drops below 0.5V, lowering average power during sustained overload. |
| Low Standby Current | 70–200µA supply current in shutdown mode enables long-term battery operation in always-on monitoring systems. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Regulating 3.3V for ARM Cortex-M4 microcontrollers and CAN transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12V vehicle or 24V industrial bus to clean 3.3V logic supply. Use Value: Delivers 3A continuously with 75% efficiency at 12V input, enabling compact design without forced air cooling. |
Use Scenario: Powering door module MCUs and LIN transceivers in 12V automotive subsystems. IC Role / Device Role / Timing Role: Non-isolated buck converter providing robust 3.3V rail tolerant to load dump and cold-crank conditions. Use Value: Withstands 22V max input and features thermal shutdown, ensuring reliability in under-hood temperature extremes. |
| Point-of-Load Telecom Board | Medical Diagnostic Sensor Interface |
|
Use Scenario: Generating 3.3V for FPGA configuration and Ethernet PHYs on telecom line cards with limited board space. IC Role / Device Role / Timing Role: High-current POL regulator replacing discrete buck solutions to meet density targets. Use Value: TO-252-5L package with 50°C/W θJA allows 3A delivery using only 2cm² copper, eliminating need for heatsinks. |
Use Scenario: Supplying low-noise 3.3V to analog front-end ADCs and sensor signal conditioners in portable diagnostic tools. IC Role / Device Role / Timing Role: Main DC/DC converter feeding LDO post-regulators for precision analog circuits. Use Value: Fixed 3.3V ±4% output and 150kHz switching enable predictable filtering with small LC components, minimizing board footprint. |
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 |
|---|---|---|---|
| LM2596-3.3 | 150kHz fixed frequency, 3A rating, but requires external compensation and has ±2% output tolerance. | Larger solution size due to external compensation network and higher dropout voltage limits minimum input to 6.5V. | Select when legacy design reuse or TI ecosystem compatibility is prioritized over board area reduction. |
| MP1584EN-LF-Z | 1.5MHz switching, 3A, adjustable/fixed versions; ±1.5% output accuracy and integrated soft-start. | Higher frequency enables smaller magnetics but increases EMI sensitivity and reduces efficiency at 3A load vs. 150kHz. | Prefer for space-constrained designs where 1.5MHz operation and soft-start justify trade-offs in thermal performance. |
Compared with LM2596-3.3 and MP1584EN-LF-Z, AP1507-33D5L-13 offers the smallest BOM count (no compensation parts), best thermal behavior at full 3A load in TO-252, and lowest cost-per-watt for 12V-to-3.3V conversion in industrial environments.
Availability
AP1507-33D5L-13 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and point-of-load telecom boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP1507-33D5L-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 and automotive markets.
The AP1507 series targets cost-sensitive, high-volume DC/DC conversion applications where integration, thermal robustness, and minimal external components are critical-especially in space-constrained industrial and automotive power rails.
FAQ
What is the minimum input voltage required for AP1507-33D5L-13 to regulate 3.3V at 3A?
The datasheet specifies a minimum operating voltage of 4.5V, but stable 3.3V regulation at full 3A load requires ≥5.5V input due to dropout constraints from the internal switch saturation voltage (1.4–1.7V). Below 5.5V, output voltage sags and regulation is lost.
Can AP1507-33D5L-13 be used without an external Schottky diode?
No. The AP1507-33D5L-13 is a non-synchronous buck controller with an integrated high-side switch only. An external Schottky diode (e.g., SB560) is mandatory for the freewheeling path; omitting it causes catastrophic failure due to lack of current recirculation during switch-off.
How does the SD pin behave when left unconnected?
The SD pin has no internal pull-up or pull-down. If left floating, its voltage is undefined and may drift near the 1.3V threshold, causing erratic ON/OFF behavior. The datasheet explicitly requires tying SD to GND for guaranteed enable operation or to VIN for guaranteed disable-never leave it open.
Is AP1507-33D5L-13 qualified for automotive AEC-Q100?
No. AP1507-33D5L-13 is not AEC-Q100 qualified. It is rated for –40°C to +85°C ambient operation and intended for industrial and commercial applications. For automotive use, Diodes Incorporated offers the AEC-Q100 qualified AP6320x series as a functional replacement.
AP1507-33D5L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-6, DPAK (5 Leads + Tab)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-252-5
AP1507-33D5L-13 FAQ
1.How can I place an order for AP1507-33D5L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1507-33D5L-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 AP1507-33D5L-13 reliable?
The price and inventory of AP1507-33D5L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1507-33D5L-13 is usually 5 days.
3.What payment methods are accepted for AP1507-33D5L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1507-33D5L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1507-33D5L-13?
AP1507-33D5L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1507-33D5L-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 AP1507-33D5L-13?
For technical support, including AP1507-33D5L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1507-33D5L-13 requirements.
6.How does Aetrix verify that AP1507-33D5L-13 is sourced from the original manufacturer or authorized distributors?
All AP1507-33D5L-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 AP1507-33D5L-13 meets industry standards.
7.What is the process for return or replacement of AP1507-33D5L-13?
All AP1507-33D5L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1507-33D5L-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 AP1507-33D5L-13 part is unused and in its original packaging.
Return procedure for AP1507-33D5L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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