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Diodes Incorporated AP1512A-33K5L-13
- Part No.:
- AP1512A-33K5L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- -
- Datasheet:
-
AP1512A-33K5L-13.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
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Inventory:927
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Product details
Overview
AP1512A-33K5L-13 from Diodes Incorporated is a monolithic 50 kHz non-synchronous PWM buck DC/DC converter in TO263-5L package, delivering up to 3 A output current at fixed 3.3 V with ±4% output voltage tolerance and integrated thermal shutdown/current limit protection. It operates from 4.5 V to 60 V input, supports logic-level ON/OFF control, and requires minimal external components for high-efficiency step-down regulation in industrial power supplies.
For engineers reviewing the AP1512A-33K5L-13 datasheet, AP1512A-33K5L-13 pinout, AP1512A-33K5L-13 application, or AP1512A-33K5L-13 equivalent, key selection criteria include its 3 A continuous load capability, 50 kHz fixed-frequency operation enabling compact filter design, internal compensation eliminating external loop components, and TO263-5L thermal performance with θJC = 3.5 °C/W.
Technical Context
The AP1512A-33K5L-13 implements voltage-mode PWM control with an internal 50 kHz oscillator (±15%), 1.235 V reference, and built-in 3 A peak-current-limited N-channel DMOS switch. Feedback is via resistive divider to the FB pin, with internal error amplifier and frequency compensation network ensuring stable regulation without external components.
Thermal shutdown activates above TJ ≈ 150 °C; current limit is internally set to 3.2–6 A (typ–max) and decreases slightly with rising temperature. The SD pin accepts 0–40 V logic-level signals, with turn-on threshold at ≤0.6 V and turn-off at ≥2.0 V, enabling direct microcontroller interface without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over 0.2–3 A load and 10–60 V input ensures stable rail for MCU cores and I/O. |
| Switching Frequency | 50 kHz ±15% enables use of low-cost, high-inductance chokes (e.g., 33–47 µH) and reduces EMI filtering burden. |
| Max Output Current | 3 A continuous (AP1512A variant) supports higher-power embedded systems without external MOSFETs. |
| Input Voltage Range | 4.5 V to 60 V accommodates wide-input industrial, automotive, and telecom power buses. |
| Quiescent Current | 5–10 mA active, 350 µA standby - enables low-power sleep modes in battery-backed systems. |
| Thermal Resistance | θJC = 3.5 °C/W (TO263-5L) allows >2 W dissipation with modest PCB copper area (≥3 in² recommended). |
| Protection Features | Integrated thermal shutdown and cycle-by-cycle current limiting prevent damage during overload or ambient rise. |
Pinout & Package
AP1512A-33K5L-13 uses the TO263-5L surface-mount package with exposed metal tab (GND-connected) for thermal conduction. Pin 1 (VIN) accepts 4.5–60 V input; Pin 2 (OUTPUT) drives the external inductor; Pin 3 (GND) is power ground; Pin 4 (FB) senses output voltage via resistor divider; Pin 5 (SD) controls ON/OFF state with logic-level input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply rail | Accepts 4.5–60 V; requires local 1 µF ceramic bypass capacitor to suppress switching transients. |
| OUTPUT (Pin 2) | Internal switch drain | Drives external inductor; voltage swings between VIN–VSAT (~1.3 V drop) and –0.5 V; minimize copper area to reduce EMI coupling. |
| GND (Pin 3) | Power and signal reference | Common return for internal circuitry, thermal tab, and external catch diode; must connect to large PCB copper pour. |
| FB (Pin 4) | Feedback input | Senses output via resistor divider; internal 1.235 V reference sets regulated voltage; bias current <10 µA minimizes divider loss. |
| SD (Pin 5) | Shutdown control | Logic-compatible input: <0.6 V = ON, >2.0 V = OFF; draws <10 µA; open or grounded = always ON. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 3 A switch | Eliminates need for external high-side MOSFET and gate driver, reducing BOM count and layout complexity. |
| Internal compensation | Enables stable loop response across line/load/temperature without external compensation components. |
| Logic-level shutdown | Direct interface with 3.3 V/5 V MCUs or GPIOs-no level shifter required for power sequencing control. |
| Wide input range (4.5–60 V) | Supports unregulated 12 V, 24 V, and 48 V industrial rails, including automotive cold-crank scenarios down to 4.5 V. |
| Lead-free & RoHS compliant | Meets EU Directive 2002/95/EC with exemption documentation; suitable for environmentally regulated production. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing clean 3.3 V rail for ARM Cortex-M microcontrollers and CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V DC bus to isolated 3.3 V logic supply with thermal robustness for cabinet-mounted enclosures. Use Value: 3 A rating handles peak current surges during Ethernet packet bursts; 60 V max input withstands load-dump transients. |
Use Scenario: Generating 3.3 V for infotainment head-unit microprocessors and sensor interfaces in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Non-isolated step-down converter operating from battery (9–16 V nominal) with cold-crank support down to 4.5 V. Use Value: Internal current limit prevents latch-up during short-circuit events on downstream USB ports; SD pin enables MCU-controlled power gating. |
| Telecom Remote Radio Unit | Factory Automation I/O Module |
Use Scenario: Delivering 3.3 V to FPGA configuration memory and RF front-end bias circuits in outdoor base station radios. IC Role / Device Role / Timing Role: High-reliability buck regulator operating from 48 V PoE-derived supply with extended temperature range support. Use Value: TO263-5L package with θJC = 3.5 °C/W enables passive cooling in sealed enclosures; 50 kHz switching avoids sensitive RF bands. |
Use Scenario: Powering digital isolators, ADCs, and fieldbus PHYs in DIN-rail mounted I/O terminals with 24 V input. IC Role / Device Role / Timing Role: Compact, low-component-count DC/DC stage replacing linear regulators to improve efficiency and reduce heat buildup. Use Value: Fixed 3.3 V output eliminates feedback resistor selection errors; internal compensation accelerates design validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-3.3/NOPB | 3 A, 150 kHz fixed-frequency, requires external compensation; wider VIN (4.5–40 V); no integrated thermal shutdown. | Lacks 60 V input support and internal thermal protection; better suited for cost-sensitive consumer designs with lower input voltage. | Choose if 150 kHz switching is preferred for smaller magnetics and board space is constrained. |
| MP1584EN-LF-Z | 3 A, 1.5 MHz adjustable-frequency, requires external compensation; VIN = 4.5–28 V; includes soft-start and remote sensing. | Not rated for >28 V input; unsuitable for 48 V telecom or industrial bus applications. | Select when high-frequency operation (1.5 MHz) is needed to shrink inductor size and avoid audio-band noise. |
Compared with LM2596T-3.3/NOPB and MP1584EN-LF-Z, AP1512A-33K5L-13 uniquely combines 60 V input capability, internal thermal/current protection, and 50 kHz operation optimized for high-voltage, high-reliability industrial use-without requiring external loop compensation.
Availability
AP1512A-33K5L-13 is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom remote radio units, and factory automation I/O modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for AP1512A-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 computing markets.
AP1512A belongs to Diodes' monolithic DC/DC converter product line, designed specifically for rugged, low-component-count buck regulation in harsh environments where input voltage variation, thermal stress, and long-term reliability are critical.
FAQ
What is the maximum allowable input voltage for AP1512A-33K5L-13?
The absolute maximum input voltage is +63 V, but the recommended operating range is +4.5 V to +60 V. Operation above 60 V risks exceeding safe junction temperature under load due to increased power dissipation in the internal switch. Sustained operation at 60 V requires adequate PCB copper area (≥3 in²) and ambient temperature below 85 °C.
Can AP1512A-33K5L-13 be used in adjustable-output configurations?
No - AP1512A-33K5L-13 is factory-trimmed for fixed 3.3 V output. Only part numbers ending in "ADJ" (e.g., AP1512A-ADJK5L-13) support adjustable output via external resistor divider on the FB pin. Attempting to modify the feedback network on this fixed-version device will not yield stable regulation and may cause output deviation beyond ±4%.
How does the SD pin behave when left unconnected?
When the SD pin is left floating or tied directly to GND, the regulator remains permanently enabled (ON). The internal pull-down ensures reliable turn-on without external biasing. This behavior simplifies designs where shutdown functionality is unused, eliminating the need for pull-up resistors or control logic.
What thermal derating applies above 85 °C ambient temperature?
Derating begins at TA > 85 °C per the Recommended Operating Conditions table. With standard 3 in² 2 oz copper, output current must be reduced by ~150 mA per 10 °C rise above 85 °C to maintain TJ ≤ 125 °C. For operation up to 125 °C ambient, double-sided boards with thermal vias and forced airflow are required to sustain 3 A output.
AP1512A-33K5L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AP1512A-33K5L-13 FAQ
1.How can I place an order for AP1512A-33K5L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512A-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 AP1512A-33K5L-13 reliable?
The price and inventory of AP1512A-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 AP1512A-33K5L-13 is usually 5 days.
3.What payment methods are accepted for AP1512A-33K5L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512A-33K5L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512A-33K5L-13?
AP1512A-33K5L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512A-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 AP1512A-33K5L-13?
For technical support, including AP1512A-33K5L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512A-33K5L-13 requirements.
6.How does Aetrix verify that AP1512A-33K5L-13 is sourced from the original manufacturer or authorized distributors?
All AP1512A-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 AP1512A-33K5L-13 meets industry standards.
7.What is the process for return or replacement of AP1512A-33K5L-13?
All AP1512A-33K5L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1512A-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 AP1512A-33K5L-13 part is unused and in its original packaging.
Return procedure for AP1512A-33K5L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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