My Inquiry
My Account
Diodes Incorporated AP1509-12SG-13
- Part No.:
- AP1509-12SG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1509-12SG-13.pdf
- Description:
- IC REG BUCK 12V 2A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,797
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP1509-12SG-13 from Diodes Incorporated is a monolithic 150 kHz, 2A non-synchronous PWM buck DC-DC converter with fixed 12 V output, integrated power switch, internal compensation, and thermal/current protection. It operates from 4.5 V to 22 V input, delivers ±4% output voltage accuracy at 2 A load, and uses an SO-8 package for compact board-level power conversion in industrial and embedded systems.
For engineers reviewing the AP1509-12SG-13 datasheet, AP1509-12SG-13 pinout, AP1509-12SG-13 application, or AP1509-12SG-13 equivalent, key selection criteria include its fixed 12 V output, 150 kHz switching frequency enabling small external inductors, ON/OFF logic-controlled shutdown, built-in current limit (3 A peak), and thermal shutdown behavior under sustained overload.
Technical Context
The AP1509-12SG-13 implements voltage-mode PWM control with a 1.23 V internal reference and feedback amplifier. Its oscillator runs at 150 kHz ±15%, and under short-circuit conditions where VFB drops below 0.5 V, switching frequency reduces to 10–50 kHz for foldback protection.
It integrates a 2 A N-channel MOSFET switch with 1.25–1.4 V saturation voltage at full load, supports logic-level shutdown (VIL = 0.6 V, VIH = 2.0 V), and features internal compensation eliminating need for external loop components - enabling stable regulation across 0–2 A load and 4.5–22 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% (11.52–12.48 V) at 0.2–2 A load and 15–22 V input - ensures stable rail for downstream logic or analog circuitry without external resistor divider. |
| Switching Frequency | 150 kHz ±15% (127–173 kHz) - enables use of compact 39–47 µH inductors and reduces EMI compared to lower-frequency buck converters. |
| Max Output Current | 2 A continuous DC load - sufficient for powering microcontrollers, sensors, or interface ICs without external pass devices. |
| Input Voltage Range | 4.5 V to 22 V - supports wide-input industrial supplies, automotive battery-derived rails (with pre-regulation), and universal AC/DC adapter outputs. |
| Efficiency | 90% typical at VIN = 15 V, VOUT = 12 V, IOUT = 2 A - minimizes thermal dissipation in space-constrained applications. |
| Shutdown Quiescent Current | 70–150 µA - enables ultra-low-power standby mode when SD pin is pulled high, critical for battery-backed systems. |
| Thermal Protection | Active junction temperature shutdown at TJ ≥ 125 °C - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
AP1509-12SG-13 is housed in a standard SO-8 (Small Outline-8) package with exposed pad not electrically connected. The package measures 4.90 mm × 6.00 mm × 1.45 mm (L × W × H) and features gull-wing leads on 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–22 V DC; requires local 10–100 µF low-ESR input capacitor to handle pulsed switch current and suppress transients. |
| GND (Pins 2, 4, 5, 7) | Power and signal ground | Four dedicated GND pins minimize ground impedance and improve thermal conduction; must be tied to a solid PCB ground plane. |
| FB (Pin 3) | Feedback input | Monitors output via internal 1.23 V reference; unused in fixed 12 V version but internally connected to setpoint - no external resistors required. |
| SD (Pin 6) | Shutdown control | Logic-compatible enable/disable: ≤0.6 V = ON, ≥2.0 V = OFF; sinking <0.1 µA allows direct MCU GPIO drive without level-shifting. |
| Output (Pin 8) | Internal switch drain | Swings between ~0 V and (VIN – 1.4 V); connects to external Schottky catch diode and LC filter - trace area must be minimized to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 A power switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout complexity in 12 V point-of-load designs. |
| Internal compensation network | Enables stable operation with only input/output capacitors and inductor - no external compensation components required for standard configurations. |
| Thermal shutdown + current limit | Provides dual-layer protection: current limit triggers frequency foldback (10–50 kHz) at >3 A peak; thermal shutdown activates above 125 °C junction temperature. |
| Logic-level ON/OFF control | SD pin accepts 0–5 V logic signals directly from MCUs or PMICs, enabling precise sequencing and system-level power management without external biasing. |
| SO-8 package with RoHS/Green compliance | Standard footprint compatible with automated assembly; lead-free, halogen-free, and antimony-free construction meets global environmental regulations. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Providing regulated 12 V rail to digital isolators, CAN transceivers, and sensor interfaces within modular PLC backplanes. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V bus to isolated 12 V domain, with shutdown synchronized to system sleep states. Use Value: Delivers 2 A at 90% efficiency with minimal external components, reducing heat generation and board area versus discrete solutions. |
Use Scenario: Generating 12 V supply for microcontroller peripherals, LED drivers, and LIN transceivers in non-safety-critical BCU modules. IC Role / Device Role / Timing Role: Non-synchronous step-down regulator operating from vehicle battery (9–16 V nominal), with thermal protection during engine cranking transients. Use Value: Tolerates up to 22 V input and includes foldback current limiting - maintains functionality during load-dump events without latch-off. |
| Point-of-Load for FPGA Core Logic | Smart Home Hub Power Management |
|
Use Scenario: Local 12 V supply for FPGA configuration memory, clock buffers, and auxiliary I/O banks in edge computing gateways. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 15 V rail; provides clean, well-regulated 12 V with fast transient response. Use Value: Fixed-output accuracy (±4%) and internal compensation ensure stable voltage under dynamic FPGA core loading without tuning. |
Use Scenario: Centralized 12 V rail powering Zigbee/Thread radio modules, touch controllers, and status LEDs in battery-assisted smart hubs. IC Role / Device Role / Timing Role: Main DC-DC converter enabled/disabled via host MCU GPIO to extend battery life during idle periods. Use Value: 70–150 µA shutdown current enables multi-week standby operation; SO-8 footprint simplifies rework and volume manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter 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. | Better suited for higher-input or higher-current designs; lacks fixed 12 V option and requires compensation tuning. | Select if input exceeds 22 V or 2 A load margin is insufficient; avoid if fixed 12 V and minimal BOM are priorities. |
| LM2596S-12 (Texas Instruments) | 40 V max input, 3 A output, 150 kHz, fixed 12 V, but requires external compensation and has higher quiescent current (5 mA vs. 150 µA). | Higher standby power limits battery use; less integrated than AP1509 - needs external compensation capacitor and diode. | Choose for legacy compatibility or TI ecosystem preference; not recommended for low-quiescent or space-constrained designs. |
Compared with MP1584EN-LF-Z and LM2596S-12, AP1509-12SG-13 offers the lowest BOM count for fixed 12 V applications, smallest footprint among SO-8 buck regulators, and lowest shutdown current - making it optimal for cost-sensitive, space-limited, and battery-aware systems where 22 V input ceiling is acceptable.
Availability
AP1509-12SG-13 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, FPGA power domains, and smart home hubs requiring stable component supply and long-term manufacturability.
Supply support for AP1509-12SG-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, headquartered in Plano, Texas, with design, manufacturing, and distribution operations across Asia, Europe, and the Americas.
The AP1509 series belongs to Diodes' power management portfolio, designed specifically for cost-effective, high-efficiency DC-DC conversion in industrial, consumer, and automotive applications where integration, reliability, and regulatory compliance are essential.
FAQ
What is the maximum allowable input voltage for AP1509-12SG-13?
The absolute maximum input voltage is +24 V, but the recommended operating range is 4.5 V to 22 V. Operation above 22 V risks exceeding safe junction temperature or violating SO-8 thermal limits, especially at full 2 A load and elevated ambient temperatures.
Can AP1509-12SG-13 be used without an external Schottky diode?
No - the AP1509-12SG-13 is a non-synchronous buck converter and requires an external Schottky catch diode (e.g., SB560, SS34) connected from Output (Pin 8) to GND. Omitting it causes catastrophic failure due to lack of freewheeling path during switch off-time.
Does AP1509-12SG-13 support adjustable output voltage?
No - AP1509-12SG-13 is factory-trimmed for fixed 12 V output. Only the AP1509-SG-13 (ADJ) variant supports external resistor programming from 1.23 V to 18 V. Attempting to modify feedback on the -12SG-13 version will result in incorrect or unstable regulation.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches approximately 125 °C, thermal shutdown disables the internal switch, dropping output to zero. After cooling below ~110 °C hysteresis, the device automatically recovers and resumes regulation - no manual reset is required.
AP1509-12SG-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:
- 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:
- 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
AP1509-12SG-13 FAQ
1.How can I place an order for AP1509-12SG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1509-12SG-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 AP1509-12SG-13 reliable?
The price and inventory of AP1509-12SG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1509-12SG-13 is usually 5 days.
3.What payment methods are accepted for AP1509-12SG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1509-12SG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1509-12SG-13?
AP1509-12SG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1509-12SG-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 AP1509-12SG-13?
For technical support, including AP1509-12SG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1509-12SG-13 requirements.
6.How does Aetrix verify that AP1509-12SG-13 is sourced from the original manufacturer or authorized distributors?
All AP1509-12SG-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 AP1509-12SG-13 meets industry standards.
7.What is the process for return or replacement of AP1509-12SG-13?
All AP1509-12SG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1509-12SG-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 AP1509-12SG-13 part is unused and in its original packaging.
Return procedure for AP1509-12SG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP1509-12SG-13 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
