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Diodes Incorporated AP1509-SG-13
- Part No.:
- AP1509-SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-SG-13.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,692
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Product details
Overview
AP1509-SG-13 from Diodes Incorporated is a monolithic 150 kHz, 2A non-synchronous PWM buck DC-DC converter with integrated high-side switch, fixed internal compensation, and adjustable output voltage (1.23 V to 18 V). It operates from 4.5 V to 22 V input, delivers ±4% output voltage tolerance at 2 A load, and includes thermal shutdown and current-limit protection. Used in compact on-card power supplies requiring minimal external components.
For engineers reviewing the AP1509-SG-13 datasheet, AP1509-SG-13 pinout, AP1509-SG-13 application, or AP1509-SG-13 equivalent, this page provides verified technical context, SO-8 package layout, feedback-based regulation details, and validated alternatives for adjustable-output buck conversion in industrial and embedded systems.
Technical Context
The AP1509-SG-13 implements voltage-mode PWM control with a fixed 150 kHz oscillator (±15%), internal 1.23 V reference, and built-in 2 A N-channel MOSFET switch. Feedback is sensed at the FB pin to regulate output via external resistor divider, enabling precise output programming across 1.23 V–18 V range.
It features logic-level ON/OFF shutdown (SD pin), automatic frequency reduction during overcurrent events (VFB < 0.5 V), and thermal shutdown at ~150 °C. The device uses internal compensation-no external loop components required-and maintains stable line/load regulation without external design effort.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 150 kHz ±15% - enables use of smaller inductors (e.g., 39–47 µH) and reduces EMI compared to lower-frequency buck regulators |
| Output Current | 2 A continuous - supports mid-power applications without external pass transistor or heatsink under typical conditions |
| Feedback Reference | 1.23 V ±2.5% - sets output voltage via R1/R2 divider; enables accurate adjustable regulation from 1.23 V to 18 V |
| Input Voltage Range | 4.5 V to 22 V - compatible with 5 V, 12 V, and 24 V rail systems; withstands transient surges up to +24 V absolute max |
| Efficiency | Up to 83% at 5 V/2 A (VIN = 12 V) - balances switching loss and conduction loss for cost-sensitive industrial power rails |
| Shutdown Quiescent Current | 70–150 µA - minimizes system standby power; SD pin accepts logic-level control (VIH > 2.0 V turns OFF) |
| Thermal Protection | Junction shutdown at ~150 °C - prevents permanent damage during overload or poor PCB thermal design |
Pinout & Package
AP1509-SG-13 is housed in an SO-8 (Small Outline-8) package with exposed pad not electrically connected. Thermal resistance is θJA = 70 °C/W (typ.) and θJC = 15 °C/W (typ.), requiring adequate copper pour for 2 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Positive input supply | Accepts 4.5–22 V DC; requires local ceramic bypass capacitor (≥10 µF) to suppress switching transients |
| GND | Ground reference | Four pins (2, 3, 6, 7) tied internally and externally to minimize ground impedance and noise coupling |
| Output | Internal switch drain | Swings between VIN–VSAT (~1.4 V drop) and ~−0.5 V; connects to inductor; avoid large copper area to reduce EMI |
| FB | Feedback input | Senses output via resistor divider; bias current ≤ −50 nA ensures minimal divider error at high resistance values |
| SD | Shutdown control | Logic-compatible input: <1.3 V = ON, >2.0 V = OFF; pulls to GND if unused; draws <0.1 µA in active state |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 A switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and board area in space-constrained designs |
| Fixed internal compensation | Removes requirement for external compensation network-simplifies design validation and improves production consistency |
| Adjustable output (1.23–18 V) | Supports flexible system-level voltage scaling using only two resistors; avoids stocking multiple fixed-output variants |
| Thermal + current-limit protection | Self-protecting under fault conditions: reduces switching frequency during overload and shuts down above junction temperature limit |
| SO-8 Green package | Lead-free, halogen-free, RoHS 3 compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb); qualified for industrial ambient (−20 °C to +85 °C) |
Applications
| Industrial Sensor Node Power | Embedded Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering 3.3 V or 5 V microcontrollers and analog sensors in factory-floor IoT nodes with 12 V or 24 V input rails. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 2 A output; regulates core voltage independent of input rail fluctuations. Use Value: Internal compensation and fixed 150 kHz frequency simplify layout and reduce component count-critical for small-form-factor sensor modules. |
Use Scenario: Generating clean 3.3 V supply for ARM Cortex-M or RISC-V SoCs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Non-synchronous buck converter providing regulated core voltage; SD pin enables firmware-controlled power sequencing. Use Value: 70–150 µA standby current supports low-power sleep modes; ±4% output tolerance ensures reliable CPU operation across temperature. |
| POS Terminal DC-DC Stage | Test Equipment Auxiliary Rail |
|
Use Scenario: Converting 12 V battery or adapter input to 5 V for payment interface, display backlight, and USB peripherals. IC Role / Device Role / Timing Role: Main DC-DC stage with ON/OFF control for system-level power management; handles dynamic load steps up to 2 A. Use Value: Built-in current limit and thermal shutdown prevent field failures during short-circuit or overheating events in unventilated enclosures. |
Use Scenario: Providing isolated 12 V or adjustable auxiliary voltage for op-amp biasing, DAC references, or FPGA I/O banks in bench instruments. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured via precision resistor divider; supports multiple test configurations from one BOM item. Use Value: 1.23 V reference accuracy and low FB bias current (<50 nA) enable tight output tolerance without trimming-reducing calibration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 340 kHz switching frequency, 3 A rating, external compensation required | Better efficiency at light loads; higher frequency allows smaller magnetics but increases EMI filtering complexity | Select when higher current headroom or tighter light-load regulation is needed; requires loop compensation design |
| LM2596S-ADJ (Texas Instruments) | 150 kHz frequency, 3 A rating, no internal soft-start, wider input range (4–40 V) | Higher input voltage capability suits 24 V/36 V industrial systems; lacks SD pin and has looser output tolerance (±4% vs ±2%) | Choose for legacy compatibility or higher VIN applications; verify thermal performance at 2 A with SO-220 package |
Compared with MP1584EN-LF-Z and LM2596S-ADJ, AP1509-SG-13 offers simpler implementation via internal compensation and logic-level shutdown, making it optimal for cost-sensitive, medium-power designs where layout area and design cycle time are critical constraints.
Availability
AP1509-SG-13 is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded microcontroller power supplies, and point-of-sale terminal DC-DC stages requiring stable component supply and long-term manufacturability.
Supply support for AP1509-SG-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 ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1509 series belongs to Diodes' standard DC-DC converter product line, designed for cost-effective, board-space-efficient buck regulation in non-automotive industrial and embedded applications-prioritizing simplicity, reliability, and ease of qualification.
FAQ
What is the minimum input voltage required for AP1509-SG-13 to regulate a 3.3 V output?
The AP1509-SG-13 requires a minimum input voltage of 4.5 V to maintain regulation at any output voltage, including 3.3 V. This is specified in the Recommended Operating Conditions table (VOP min = 4.5 V). Below this, dropout behavior occurs and output voltage drops linearly with input.
Can AP1509-SG-13 be used in a negative-output configuration?
Yes-the AP1509-SG-13 can be configured as a positive-to-negative buck-boost (inverting) regulator per the "Positive to Negative Converter" application note in its datasheet. It requires repositioning the inductor and diode, with FB referenced to the negative output rail; efficiency and ripple performance differ from standard buck mode.
Is the SD pin internally pulled up or down when left unconnected?
The SD pin has no internal pull-up or pull-down. If left floating, its voltage is undefined and may cause erratic ON/OFF behavior. Diodes Incorporated recommends tying SD directly to GND for always-on operation or to a controlled logic source; never leave it unconnected.
Does AP1509-SG-13 support synchronous rectification?
No-AP1509-SG-13 is a non-synchronous buck converter. It integrates only a high-side N-channel MOSFET switch and requires an external Schottky catch diode (e.g., D1 in typical application circuits). Synchronous operation would require a second actively driven switch, which this IC does not provide or control.
AP1509-SG-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 18V
- 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-SG-13 FAQ
1.How can I place an order for AP1509-SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-SG-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-SG-13 reliable?
The price and inventory of AP1509-SG-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-SG-13 is usually 5 days.
3.What payment methods are accepted for AP1509-SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-SG-13?
AP1509-SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-SG-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-SG-13?
For technical support, including AP1509-SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-SG-13 requirements.
6.How does Aetrix verify that AP1509-SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-SG-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-SG-13 meets industry standards.
7.What is the process for return or replacement of AP1509-SG-13?
All AP1509-SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-SG-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-SG-13 part is unused and in its original packaging.
Return procedure for AP1509-SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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