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Diodes Incorporated AP1512-33K5L-U
- Part No.:
- AP1512-33K5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512-33K5L-U.pdf
- Description:
- IC REG BUCK 3.3V 2A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
AP1512-33K5L-U from Diodes Incorporated is a monolithic 50 kHz non-synchronous PWM buck DC/DC converter with fixed 3.3 V output, integrated 2 A switch, 4.5–60 V input range, and thermal/current protection. It operates in TO263-5L package and delivers stable regulation for industrial power rails requiring compact, low-component-count step-down conversion.
For engineers reviewing the AP1512-33K5L-U datasheet, AP1512-33K5L-U pinout, AP1512-33K5L-U application, or AP1512-33K5L-U equivalent, key selection criteria include its 3.3 V ±4% output tolerance, 50 kHz ±15% oscillator, ON/OFF logic-controlled shutdown, internal compensation, and thermal shutdown at 125 °C junction temperature.
Technical Context
The AP1512-33K5L-U implements voltage-mode PWM control with a built-in 2 A N-channel MOSFET switch and internal 1.235 V reference. Feedback is taken directly from the FB pin to regulate output via external resistor divider (not required for fixed 3.3 V version).
It features fixed 50 kHz switching frequency enabling use of smaller passive components, and integrates current-limit protection (2.5–5.5 A peak), thermal shutdown, and logic-level shutdown (SD pin threshold: 1.3 V). No external compensation network is needed due to internal frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% under 0.2–2 A load and 10–60 V input - ensures stable rail for microcontrollers and logic interfaces. |
| Switching Frequency | 50 kHz ±15% - enables use of standard, cost-effective 33–47 µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-input industrial, automotive, and telecom power systems without pre-regulation. |
| Output Current | 2 A continuous - sufficient for powering FPGA I/O banks, sensor signal chains, or dual-core MCU subsystems. |
| Shutdown Quiescent Current | 350 µA at VIN = 60 V - enables ultra-low-power standby in battery-backed or energy-conscious systems. |
| Thermal Protection | Junction shutdown at ~125 °C - prevents latch-up or permanent damage during overload or poor heatsinking conditions. |
| Feedback Reference | Internal 1.235 V bandgap - eliminates need for external reference in adjustable versions; unused in fixed 3.3 V variant. |
Pinout & Package
AP1512-33K5L-U is housed in a surface-mount TO263-5L package with exposed metal tab (GND-connected) for thermal conduction to PCB copper. The 5-pin layout supports high-current switching with minimal parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–60 V; requires local 1 µF ceramic bypass to suppress switching transients and supply peak currents. |
| OUTPUT (Pin 2) | Switching node | Drives external catch diode and inductor; voltage swings between (VIN – 1.5 V) and –0.5 V; minimize copper area to reduce EMI coupling. |
| GND (Pin 3) | Power and signal ground | Common return for internal circuitry, switch source, and thermal tab; must connect to large PCB copper pour for heat dissipation. |
| FB (Pin 4) | Feedback input | Internally tied to 3.3 V divider; not user-accessible in fixed-output version - no external resistors required. |
| SD (Pin 5) | Shutdown control | Logic-level input: ≤1.3 V = ON, ≥2.0 V = OFF; draws <10 µA; can be grounded or left floating for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 A power switch | Eliminates external MOSFET and gate driver, reducing BOM count and board area by >30% vs discrete buck solutions. |
| Internal compensation | Enables stable loop response across line/load/temperature without external RC networks - simplifies design validation. |
| Logic-compatible shutdown | Direct interface with MCU GPIO or system supervisor ICs; supports coordinated power sequencing and low-power sleep modes. |
| Thermal + current limiting | Dual-protection architecture prevents failure during short-circuit, overtemperature, or startup surge events - improves field reliability. |
| Lead-free TO263-5L package | RoHS-compliant surface-mount package with GND-tab thermal path; supports reflow soldering and meets IPC-J-STD-020 moisture sensitivity level 3. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing isolated 3.3 V rail for digital I/O expansion cards in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24 V to clean 3.3 V for microcontroller peripherals and optocoupler drivers. Use Value: Delivers 2 A with <±4% output accuracy and withstands 60 V transients per ISO 7637-2, eliminating need for upstream TVS or LDO post-regulation. |
Use Scenario: Powering CAN transceiver, EEPROM, and wake-up controller in body control modules supplied from 12 V battery with load-dump spikes. IC Role / Device Role / Timing Role: Main 3.3 V supply with shutdown controlled by vehicle ignition signal to enable zero-current sleep state. Use Value: 350 µA standby current extends battery life during parking; 60 V max input handles load-dump surges without derating. |
| Point-of-Load Telecom Supply | Medical Sensor Signal Chain |
|
Use Scenario: Generating 3.3 V for FPGA configuration memory and SerDes bias in small-form-factor telecom line cards powered from 48 V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing multi-chip discrete designs to meet space-constrained 1U chassis requirements. Use Value: TO263-5L package with GND tab provides 3.5 °C/W θJC, enabling 2 A operation at 85 °C ambient without heatsink. |
Use Scenario: Powering low-noise analog front-end (AFE), ADC, and wireless BLE SoC in portable patient monitors with 9 V alkaline or Li-ion input. IC Role / Device Role / Timing Role: Primary regulated supply ensuring <10 mV p-p ripple on 3.3 V rail for 16-bit ADC reference stability. Use Value: Fixed 3.3 V version avoids feedback resistor tolerance errors; 50 kHz switching allows use of shielded 33 µH inductors to minimize magnetic coupling. |
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 |
|---|---|---|---|
| LM2575HVS-3.3 | 52 kHz switching, 1 A output, requires external diode and compensation; wider input (4–60 V), but lower current rating. | Suitable only for ≤1 A loads; lacks integrated switch saturation voltage optimization and thermal shutdown hysteresis. | Select when legacy design reuse or MIL-PRF-19500 screening is required; avoid for new 2 A designs. |
| MP1584EN-LF-Z | 1.5 MHz switching, 3 A output, synchronous rectification, adjustable-only; requires external feedback resistors and compensation. | Better efficiency above 12 V input but generates higher EMI; needs careful layout for 1.5 MHz operation. | Prefer for high-density boards needing >85% efficiency at light loads; not drop-in due to pinout and feedback architecture. |
Compared with LM2575HVS-3.3 and MP1584EN-LF-Z, AP1512-33K5L-U offers verified 2 A capability in a fixed-output, fully integrated TO263 package with no external compensation - ideal for cost-sensitive, thermally constrained industrial applications where 50 kHz EMI profile is acceptable.
Availability
AP1512-33K5L-U is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and point-of-load telecom converters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AP1512-33K5L-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.
The AP1512 series belongs to Diodes' high-voltage buck regulator product line, designed specifically for robust, low-BOM-count DC/DC conversion in industrial, automotive, and telecom infrastructure where input voltages exceed 40 V.
FAQ
Is AP1512-33K5L-U pin-compatible with AP1512-50K5L-U?
Yes - both share identical TO263-5L pinout and electrical interface. Only the internal feedback divider differs to set 3.3 V or 5.0 V output. No PCB redesign is needed when swapping between fixed-output variants, provided output capacitor and inductor ratings remain appropriate for the new voltage/current combination.
What is the minimum recommended PCB copper area for thermal performance?
Diodes specifies a minimum of 0.4 in² (≈2.6 cm²) of 2 oz copper connected to the GND tab. For full 2 A operation at 85 °C ambient, ≥2 in² is strongly recommended. Thermal resistance drops from 23 °C/W (θJA) at 0.4 in² to ~12 °C/W with 4 in², significantly improving sustained output current capability.
Can AP1512-33K5L-U operate with input voltage below 4.5 V?
No - the absolute minimum operating input voltage is 4.5 V per datasheet Recommended Operating Conditions. Below this, internal bias circuits fail to start or sustain regulation. Startup may occur at ~4.2 V under ideal lab conditions, but it is not guaranteed or characterized across temperature and process variation.
Does the SD pin require a pull-up or pull-down resistor for reliable operation?
No external resistor is required. When unused, SD can be left floating or tied directly to GND - both configurations force ON state. If interfacing with open-drain logic, a 10 kΩ pull-up to VIN is acceptable, but not necessary. Input leakage is <10 µA, so drive strength requirements are minimal.
AP1512-33K5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1512-33K5L-U FAQ
1.How can I place an order for AP1512-33K5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512-33K5L-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 AP1512-33K5L-U reliable?
The price and inventory of AP1512-33K5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1512-33K5L-U is usually 5 days.
3.What payment methods are accepted for AP1512-33K5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512-33K5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512-33K5L-U?
AP1512-33K5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512-33K5L-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 AP1512-33K5L-U?
For technical support, including AP1512-33K5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512-33K5L-U requirements.
6.How does Aetrix verify that AP1512-33K5L-U is sourced from the original manufacturer or authorized distributors?
All AP1512-33K5L-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 AP1512-33K5L-U meets industry standards.
7.What is the process for return or replacement of AP1512-33K5L-U?
All AP1512-33K5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1512-33K5L-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 AP1512-33K5L-U part is unused and in its original packaging.
Return procedure for AP1512-33K5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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