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Diodes Incorporated AP1509-33SG-13
- Part No.:
- AP1509-33SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-33SG-13.pdf
- Description:
- IC REG BUCK 3.3V 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,673
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Product details
Overview
AP1509-33SG-13 from Diodes Incorporated is a monolithic 150 kHz, 2A non-synchronous PWM buck DC-DC converter with fixed 3.3 V output, integrated power switch, internal compensation, and thermal/current protection. It operates from 4.75–22 V input, delivers ±4% output voltage accuracy at 2 A load, and uses an SO-8 package for space-constrained industrial power rails.
For engineers reviewing the AP1509-33SG-13 datasheet, AP1509-33SG-13 pinout, AP1509-33SG-13 application, or AP1509-33SG-13 equivalent, key selection criteria include its fixed 3.3 V output, 150 kHz switching frequency, ON/OFF shutdown control, thermal shutdown behavior, and SO-8 thermal resistance (θJA = 70 °C/W).
Technical Context
The AP1509-33SG-13 implements voltage-mode PWM control with a built-in 1.235 V reference and 150 kHz oscillator. Its feedback loop compares output voltage against this reference via the FB pin, adjusting duty cycle to maintain regulation without external compensation components.
It integrates a 2 A N-channel MOSFET switch with 1.25–1.4 V saturation voltage at full load, and features logic-level shutdown (SD pin) with 1.3 V threshold. Protection includes current limiting (3 A peak) and thermal shutdown triggered above +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over 0.2–2 A load and -20 to +85 °C ambient - ensures stable logic rail supply without external resistor network. |
| Switching Frequency | 150 kHz ±15% - enables use of compact 47 µH inductors and reduces EMI compared to lower-frequency buck regulators. |
| Max Output Current | 2 A continuous - supports mid-power applications like microcontroller cores, FPGA I/O banks, and sensor interfaces. |
| Input Voltage Range | 4.75 V to 22 V - accommodates 5 V, 12 V, and 19 V nominal supplies while maintaining regulation during brownout or automotive transients. |
| Shutdown Quiescent Current | 70–150 µA - minimizes system standby power when SD pin is pulled high, critical for battery-backed or energy-sensitive designs. |
| Thermal Shutdown Threshold | +125 °C junction temperature - prevents permanent damage during overload or poor heatsinking; auto-recovery on cooldown. |
| Feedback Reference Voltage | 1.23 V typical - used internally to regulate output; not accessible externally on fixed-output variants like AP1509-33SG-13. |
Pinout & Package
AP1509-33SG-13 is housed in a standard SO-8 (S) package with exposed pad thermal performance optimized for PCB copper area. Pin 1 is VIN; pins 2, 4, 6, and 7 are GND; pin 3 is FB (internally connected to 1.23 V reference for fixed 3.3 V version); pin 5 is Output (switch node); pin 8 is SD (shutdown control).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input Supply | Accepts 4.75–22 V DC; requires local 100 µF low-ESR input capacitor to suppress switching transients and supply peak currents. |
| GND (Pins 2, 4, 6, 7) | Ground Reference | Four dedicated ground pins reduce impedance and improve thermal dissipation; must be tied to a low-inductance ground plane. |
| FB (Pin 3) | Feedback Input | Internally connected to 1.23 V reference; no external resistors needed for 3.3 V output - simplifies layout and eliminates resistor tolerance errors. |
| Output (Pin 5) | Switch Node | Drives external Schottky diode and LC filter; high dv/dt node - minimize PCB copper area to reduce EMI coupling. |
| SD (Pin 8) | Shutdown Control | Logic-compatible input: <1.3 V = ON, >2.0 V = OFF; pulls regulator into 150 µA standby mode - enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 A Power Switch | Eliminates need for external MOSFET and gate driver - reduces BOM count, board area, and layout complexity in cost-sensitive buck designs. |
| Internal Compensation Network | Enables stable regulation with only input/output capacitors and inductor - removes requirement for external compensation components and tuning effort. |
| Thermal Shutdown + Current Limit | Protects IC under overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure and supports robust field operation. |
| SO-8 Green Package | Lead-free, halogen-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb) - meets global environmental compliance requirements for industrial and consumer products. |
| 150 kHz Fixed Oscillator | Provides predictable EMI profile and consistent inductor sizing - avoids frequency variation issues seen in current-mode or variable-frequency controllers. |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
Use Scenario: Providing clean 3.3 V supply to digital I/O circuits in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Primary step-down regulator converting 12 V backplane supply to isolated 3.3 V logic rail with ripple rejection and transient immunity. Use Value: Delivers 2 A at ±4% accuracy across -20 to +85 °C, enabling reliable communication with sensors and actuators without external LDO post-regulation. | Use Scenario: Powering ARM Cortex-M series MCUs and associated peripherals in edge-node IoT gateways with limited PCB real estate. IC Role / Device Role / Timing Role: Main DC-DC converter supplying core voltage to MCU and flash memory, synchronized to system clock domain via fixed 150 kHz switching. Use Value: Integrated switch and compensation reduce component count by ≥4 vs. controller+MOSFET solutions, accelerating time-to-market for compact designs. |
| Automotive Body Control Modules | Point-of-Load Converters in Test Equipment |
Use Scenario: Generating 3.3 V for CAN transceivers and LIN interface ICs in non-safety-critical automotive body electronics. IC Role / Device Role / Timing Role: Secondary regulator downstream of 5 V pre-regulator, handling load steps up to 2 A during window motor activation or lighting bursts. Use Value: Thermal shutdown and current limit protect against wiring faults or connector shorts common in vehicle harnesses - improves field reliability. | Use Scenario: Local 3.3 V supply for ADC front-ends and FPGA configuration circuitry in benchtop signal analyzers requiring low-noise analog performance. IC Role / Device Role / Timing Role: Isolated buck stage decoupled from main 24 V supply, minimizing switching noise injection into sensitive analog signal paths. Use Value: Fixed 3.3 V output eliminates resistor divider drift, ensuring measurement accuracy stability over temperature and time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 40 V max input, 3 A output, 1.8 MHz switching, adjustable output only | Requires external feedback resistors; higher frequency demands smaller inductors but increases EMI filtering burden | Select when wider input range or higher current is required; rework needed for fixed 3.3 V output. |
| LM2596S-3.3 (Texas Instruments) | 40 V max input, 3 A output, 150 kHz, fixed 3.3 V, TO-263-5 package | Larger thermally enhanced package; higher θJA (~65 °C/W) but better heat spreading with exposed tab | Prefer for high-ambient-temperature environments where SO-8 thermal limits may be exceeded. |
Compared with MP1584EN-LF-Z and LM2596S-3.3, AP1509-33SG-13 offers lowest BOM count for fixed 3.3 V conversion at 2 A, optimal for space-constrained industrial boards where 22 V input ceiling and SO-8 footprint are acceptable constraints.
Availability
AP1509-33SG-13 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded microcontroller power rails, and point-of-load converters requiring stable component supply, long-lifecycle support, and RoHS 3 compliance.
Supply support for AP1509-33SG-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, computing, and automotive markets.
The AP1509 series belongs to Diodes' standard DC-DC converter product line, designed specifically for cost-sensitive, medium-current step-down applications where integration, thermal robustness, and regulatory compliance are prioritized over ultra-high efficiency or wide-input flexibility.
FAQ
What is the minimum input voltage required for AP1509-33SG-13 to regulate at full 2 A load?
The AP1509-33SG-13 requires a minimum input voltage of 4.75 V to maintain 3.3 V regulation across its full 0–2 A load range and -20 to +85 °C ambient temperature. Below this, dropout occurs and output voltage collapses proportionally to input reduction.
Can the AP1509-33SG-13 be used without an external Schottky diode?
No - the AP1509-33SG-13 is a non-synchronous buck converter and requires an external Schottky diode (e.g., SB560 or equivalent) between the Output pin and GND to provide the freewheeling path during switch-off periods. Omitting it causes catastrophic failure.
How does the SD pin behave during power-up, and is a pull-up or pull-down required?
The SD pin defaults to regulator enable (ON) when left unconnected due to internal bias; however, Diodes recommends tying it directly to GND if shutdown is unused. A pull-up is not required and may cause unintended disable if leakage or noise exceeds 1.3 V threshold.
Is AP1509-33SG-13 qualified for automotive applications per AEC-Q100?
No - AP1509-33SG-13 is not AEC-Q100 qualified. While Diodes offers automotive-grade versions of other regulators, this specific part is rated for industrial temperature range (-20 to +85 °C ambient) and lacks PPAP documentation, stress testing, or IATF 16949 manufacturing certification.
AP1509-33SG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 2A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
AP1509-33SG-13 FAQ
1.How can I place an order for AP1509-33SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-33SG-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 AP1509-33SG-13 reliable?
The price and inventory of AP1509-33SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1509-33SG-13 is usually 5 days.
3.What payment methods are accepted for AP1509-33SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-33SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-33SG-13?
AP1509-33SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-33SG-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 AP1509-33SG-13?
For technical support, including AP1509-33SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-33SG-13 requirements.
6.How does Aetrix verify that AP1509-33SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-33SG-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 AP1509-33SG-13 meets industry standards.
7.What is the process for return or replacement of AP1509-33SG-13?
All AP1509-33SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-33SG-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 AP1509-33SG-13 part is unused and in its original packaging.
Return procedure for AP1509-33SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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