The Diodes Incorporated AP1501A-50K5G-13 is a 5V fixed-output, 5A step-down DC/DC switching regulator from the AP1501A family. The device integrates its power switch and is designed to drive loads of up to 5A without an additional power transistor. Diodes Incorporated currently places the AP1501A family in its inactive datasheet archive with NRND — Not Recommended for New Design status.
The AP1501A operates from a 4.5V to 40V input supply and uses a fixed 150kHz switching frequency. The -50 version provides a fixed 5V output, while the family also included 3.3V, 12V, and adjustable-output variants.
An integrated ON/OFF shutdown input allows the regulator to enter a low-power standby state. Pulling the SD input above its approximately 1.3V threshold disables the regulator, reducing total input current to approximately 150µA.
Integrated protection includes current limiting and thermal shutdown. The official application information specifies thermal shutdown at approximately 150°C typical, while the design guidance recommends keeping maximum junction temperature at or below 125°C during normal operation. As a nonsynchronous buck regulator, the application circuit requires an external Schottky catch diode, inductor, and filtering capacitors.
The AP1501A family is available in a 5-lead TO-263 surface-mount package, which Diodes Incorporated lists in its official package database for the AP1501A. Adequate PCB copper area and thermal design are important when operating near the 5A load rating.
Key Features:
- Manufacturer: Diodes Incorporated
- Part Number: AP1501A-50K5G-13
- Family: AP1501A
- Device Type: Step-Down Switching Regulator
- Topology: Nonsynchronous Buck
- Fixed Output Voltage: 5V
- Maximum Load Current: 5A
- Input Voltage Range: 4.5V to 40V
- Switching Frequency: 150kHz
- Integrated Power Switch
- External Catch Diode Required
- ON/OFF Shutdown Control
- Shutdown Current: Approx. 150µA
- Shutdown Threshold: Approx. 1.3V
- Current-Limit Protection
- Thermal Shutdown Protection
- Typical Thermal Shutdown: Approx. 150°C
- Recommended Maximum Junction Temperature: 125°C
- Package: TO-263-5
- Mounting Type: Surface Mount
- Lifecycle Status: NRND.
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