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Diodes Incorporated AP1507-12D5L-U
- Part No.:
- AP1507-12D5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-6, DPAK (5 Leads + Tab)
- Datasheet:
-
AP1507-12D5L-U.pdf
- Description:
- IC REG BUCK 12V 3A TO252-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,653
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Product details
Overview
AP1507-12D5L-U from Diodes Incorporated is a monolithic 150 kHz fixed-frequency PWM buck DC/DC converter with integrated 3A switch, delivering a regulated 12 V output from 15–22 V input. It features internal compensation, thermal shutdown, current-limit protection, and logic-level ON/OFF control. Used in industrial power supplies and embedded systems requiring compact, high-current step-down regulation.
For engineers reviewing the AP1507-12D5L-U datasheet, AP1507-12D5L-U pinout, AP1507-12D5L-U application, or AP1507-12D5L-U equivalent, this page provides verified technical context, package mapping, real-world design meaning for key specs, and validated alternative options for 12 V, 3 A buck conversion.
Technical Context
The AP1507-12D5L-U implements voltage-mode non-synchronous PWM control with a fixed 150 kHz oscillator (±15%), enabling use of smaller external inductors and capacitors. Its internal 1.235 V reference and feedback amplifier compare FB voltage to regulate output without external compensation components.
Thermal shutdown activates at junction temperatures exceeding +125 °C; current limit triggers at 3.6–5.5 A peak switch current, reducing switching frequency to 10–50 kHz when VFB drops below 0.5 V. The SD pin accepts 0–18 V logic-level signals to enable/disable regulation with standby current as low as 70 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% (11.52–12.48 V) under 15–22 V input and 0.2–3 A load - ensures stable rail for microcontrollers and peripherals. |
| Switching Frequency | 150 kHz ±15% (127–173 kHz) - enables use of ≤47 µH inductors and reduces EMI compared to lower-frequency buck regulators. |
| Output Current | 3 A continuous - supports single-rail power for FPGA I/O banks or motor drivers without external MOSFETs. |
| Input Voltage Range | 15–22 V operating range - compatible with 18 V nominal industrial bus rails and 24 V systems with derating. |
| Efficiency | 89% at VIN = 16 V, IOUT = 3 A - minimizes thermal load on TO-252-5L package with 50 °C/W θJA on standard PCB copper. |
| Feedback Threshold | 1.23 V reference (typical) - sets output via internal resistor divider; no external resistors required for fixed 12 V version. |
| Shutdown Quiescent Current | 70–200 µA - enables ultra-low-power sleep modes in battery-backed or energy-conscious systems. |
Pinout & Package
AP1507-12D5L-U is housed in a lead-free, RoHS-compliant TO-252-5L (DPAK) surface-mount package with exposed metal tab for thermal conduction to PCB copper. The tab is electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Positive input supply | Accepts 15–22 V DC; requires local 10–100 µF input capacitor to suppress switching transients and supply peak currents. |
| 2 Output | Internal power switch drain | Swings between ~0 V and (VIN – 1.6 V); connects to inductor and Schottky catch diode anode - keep trace short and minimize copper area to reduce EMI. |
| 3 GND | Ground reference | Common return for internal circuitry, feedback amplifier, and thermal path; must be tied directly to large PCB ground plane. |
| 4 FB | Output voltage feedback | Monitors regulated output via internal 1.23 V reference; unused in fixed 12 V version - leave unconnected or tie to GND per datasheet guidance. |
| 5 SD | Shutdown control input | Logic-compatible enable: <1.3 V = ON, >2.0 V = OFF; pull to GND for always-on operation or drive with MCU GPIO for dynamic power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 A power switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and layout complexity in space-constrained designs. |
| Fixed 12 V output with ±4% tolerance | Meets tight regulation requirements for industrial sensors and analog front-ends without trimming or external feedback resistors. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient temperature rise beyond +85 °C ambient - prevents latch-up or permanent damage during fault conditions. |
| 150 kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across production batches - avoids variable-frequency jitter seen in hysteretic controllers. |
| ON/OFF logic control (SD pin) | Supports power-state coordination with host processors - allows synchronized wake-up/sleep transitions in multi-rail systems. |
Applications
| Industrial PLC Power Supply | Embedded Controller Core Rail |
|---|---|
|
Use Scenario: Providing clean 12 V power to I/O modules and communication interfaces in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V bus to isolated 12 V rail; operates continuously with thermal management via PCB copper pour. Use Value: 89% efficiency at full load reduces heat buildup inside sealed enclosures; TO-252-5L package allows direct mounting to heatsinked ground planes. |
Use Scenario: Generating stable 12 V supply for ARM-based industrial gateways handling Modbus TCP and CAN FD interfaces. IC Role / Device Role / Timing Role: Main system power IC enabling fast startup and controlled power sequencing via SD pin driven by microcontroller GPIO. Use Value: 70 µA standby current extends backup runtime during brownout events; fixed output eliminates calibration overhead in production test. |
| Test Equipment Auxiliary Rail | Motor Drive Logic Supply |
|
Use Scenario: Delivering regulated 12 V to op-amp signal conditioning stages and ADC reference buffers in portable benchtop analyzers. IC Role / Device Role / Timing Role: Low-noise auxiliary regulator decoupled from main SMPS; uses minimal external components to preserve board area. Use Value: Internal compensation and 150 kHz switching yield predictable ripple (<50 mVpp) without iterative loop tuning or external compensation networks. |
Use Scenario: Powering gate driver ICs and isolation logic in 24 V brushless DC motor drives with intermittent high-current bursts. IC Role / Device Role / Timing Role: Robust intermediate rail generator surviving repeated current-limit events during motor stall conditions. Use Value: Current-limit foldback (reduced frequency mode) maintains regulation during overloads instead of hard shutdown - avoids system resets during transient stalls. |
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 |
|---|---|---|---|
| LM2576HVS-12 | 5-pin TO-220; 52 kHz switching; external diode required; higher dropout voltage (3.5 V min VIN–VOUT). | Lower frequency demands larger L/C; less suitable for compact layouts but offers wider input range (4–60 V). | Choose for high-input-voltage (>40 V) industrial inputs where size is secondary to ruggedness. |
| MP1584EN-LF-Z | 8-pin SOIC-EP; 1.5 MHz switching; adjustable/fixed versions; requires external feedback resistors even for fixed 12 V. | Higher frequency enables tiny 2.2 µH inductors but increases EMI sensitivity and gate drive losses at 3 A. | Choose when board space is critical and thermal budget allows higher switching losses; verify layout EMI compliance. |
Compared with LM2576HVS-12 and MP1584EN-LF-Z, AP1507-12D5L-U delivers optimal balance of integration (no external diode), thermal performance (TO-252-5L with GND tab), and predictable 150 kHz operation - making it ideal for cost-sensitive, medium-power industrial converters where reliability and layout simplicity are prioritized over ultra-small size or ultra-wide VIN.
Availability
AP1507-12D5L-U is available at Aetrix Electronics and suitable for industrial PLCs, embedded gateways, test equipment power supplies, and motor drive logic rails requiring stable component supply and long-term manufacturability.
Supply support for AP1507-12D5L-U 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-effective, high-current DC/DC conversion in space-constrained industrial applications - emphasizing integration, thermal robustness, and simplified design with minimal external components.
FAQ
What is the minimum input voltage required for AP1507-12D5L-U to regulate properly?
The AP1507-12D5L-U requires a minimum input voltage of 15 V to maintain 12 V output regulation across its full 3 A load range, as specified in the Recommended Operating Conditions table. Below 15 V, dropout occurs due to internal switch saturation voltage (~1.6 V) and feedback headroom constraints - operation below this threshold results in unregulated output or shutdown.
Can the FB pin be used to adjust the output voltage of the AP1507-12D5L-U?
No - the AP1507-12D5L-U is a fixed 12 V output variant with internal resistor divider; the FB pin is not connected to the internal feedback network and must be left floating or tied to GND per datasheet guidance. Only the AP1507-ADJ version supports external adjustment using R1/R2 resistors to set VOUT = 1.23 V × (1 + R2/R1).
How should the TO-252-5L thermal pad be connected on the PCB?
The metal tab (pin 2 "Output" and pin 3 "GND") on the TO-252-5L package must be soldered to a minimum 0.8 in² copper pour tied directly to the system ground plane. For optimal thermal performance, use ≥2 in² of 2 oz. copper with multiple thermal vias to inner ground layers - this achieves the rated 50 °C/W θJA and prevents junction temperature exceedance at full 3 A load.
Does AP1507-12D5L-U require an external catch diode?
Yes - the AP1507-12D5L-U is a non-synchronous buck controller with an integrated high-side switch only. A Schottky diode (e.g., SB560, 60 V, ≥3 A avg.) must be placed between the Output pin and GND, with cathode to Output and anode to GND, to provide the freewheeling path during switch off-time. Omitting this diode causes catastrophic failure.
AP1507-12D5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-6, DPAK (5 Leads + Tab)
- Packaging:
- Tube
- 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):
- 12V
- 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
AP1507-12D5L-U FAQ
1.How can I place an order for AP1507-12D5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1507-12D5L-U 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 AP1507-12D5L-U reliable?
The price and inventory of AP1507-12D5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1507-12D5L-U is usually 5 days.
3.What payment methods are accepted for AP1507-12D5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1507-12D5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1507-12D5L-U?
AP1507-12D5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1507-12D5L-U 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 AP1507-12D5L-U?
For technical support, including AP1507-12D5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1507-12D5L-U requirements.
6.How does Aetrix verify that AP1507-12D5L-U is sourced from the original manufacturer or authorized distributors?
All AP1507-12D5L-U 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 AP1507-12D5L-U meets industry standards.
7.What is the process for return or replacement of AP1507-12D5L-U?
All AP1507-12D5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1507-12D5L-U, 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 AP1507-12D5L-U part is unused and in its original packaging.
Return procedure for AP1507-12D5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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