The Diodes Incorporated AP1509-SG-13 is a 2A PWM step-down DC/DC converter with an integrated power switch, allowing it to drive loads up to 2A without an external power transistor. It uses voltage-mode nonsynchronous PWM control and is suitable for on-card regulators, power modules, and general step-down conversion.
The exact AP1509-SG-13 is the adjustable-output version, operating from a recommended 4.5V to 22V input range with an adjustable output from 1.23V to 18V. The typical feedback reference is approximately 1.23V.
The converter operates at a fixed 150kHz switching frequency and includes internal frequency compensation. As a nonsynchronous buck regulator, the application circuit requires an external catch diode, inductor, and input/output capacitors.
Integrated protection includes ON/OFF shutdown, current limiting, short-circuit frequency reduction, and thermal shutdown. Typical quiescent current is approximately 5mA, while shutdown current is about 70µA typical. The specified peak current-limit threshold is at least 3A.
The AP1509-SG-13 is supplied in an 8-pin SO-8 package. The G suffix identifies the Green version, while -13 denotes 13-inch tape-and-reel packaging with 2,500 devices per reel. Diodes Incorporated currently lists this exact adjustable version as NRND — Not Recommended for New Design.
Key Features:
- Manufacturer: Diodes Incorporated
- Part Number: AP1509-SG-13
- Device Type: PWM Buck DC/DC Converter
- Topology: Nonsynchronous Buck
- Output Type: Adjustable
- Input Voltage: 4.5V to 22V
- Output Voltage: 1.23V to 18V
- Output Current: Up to 2A
- Switching Frequency: 150kHz Typical
- Feedback Reference: Approx. 1.23V
- Maximum Duty Cycle: 100%
- Typical Quiescent Current: 5mA
- Typical Shutdown Current: 70µA
- Peak Current Limit: ≥3A
- ON/OFF Shutdown Control
- Current-Limit Protection
- Short-Circuit Frequency Reduction
- Thermal Shutdown
- Internal Frequency Compensation
- HBM ESD: 2kV
- Ambient Operating Temperature: -20°C to +85°C
- Junction Temperature: -40°C to +125°C
- Package: SO-8
- Packaging: 13-inch Tape & Reel
- Reel Quantity: 2,500 pcs
- Lead-Free / RoHS / Green
- Lifecycle Status: NRND.
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