APM81815KNBJTR

Overview

The APM81815KNBJTR is a synchronous buck DC-DC regulator from Allegro MicroSystems, designed for high-voltage input applications. It operates with an input voltage range of 5 V to 72 V and delivers up to 1.5 A output current. The device supports fixed output voltages including 3.3 V, 5 V, 5.35 V, and 12 V. Key electrical parameters include a quiescent current of 24 uA during operation and 28 uA in standby, with a switching frequency of 2.15 MHz. It functions within a temperature range of -40°C to +150°C and is housed in a QFN-24 package.

Feature Summary

• Integrated synchronous buck topology for efficient power conversion
• Wide input voltage capability suitable for 48V systems
• Ultralow quiescent current for enhanced energy efficiency
• High operating junction temperature rating for robust thermal performance

Applications

• Dual-voltage hybrid electric vehicle power distribution
• Industrial automation control systems
• Telecommunications infrastructure power supplies
• Automotive infotainment and body electronics modules

Procurement Notes

Verify the complete part number against official Allegro MicroSystems documentation to ensure correct suffix alignment. Confirm that the specific output voltage variant matches the design requirement, as the series offers multiple fixed options. Check moisture sensitivity levels and reflow soldering profiles prior to assembly to maintain component integrity during manufacturing processes.

Selection Notes

Select this component when a wide input voltage range up to 72 V is required alongside moderate current delivery. The fixed 2.15 MHz switching frequency allows for optimized passive component sizing compared to lower-frequency alternatives. Ensure the application environment supports the specified operating temperature range and that the QFN-24 package footprint aligns with the PCB layout constraints.

Part Context

This regulator belongs to the APM81815 series, which targets automotive and industrial markets requiring reliable power management under harsh conditions. The series emphasizes EMI performance and efficiency in high-voltage environments. It complements other Allegro PMIC solutions by providing a dedicated step-down regulation path for subsystems needing stable voltage from variable or high-input sources.

Replacement Considerations

Direct pin-to-pin replacements are not explicitly confirmed in public datasheets for this specific suffix. Evaluate alternative Allegro buck regulators with similar input ranges and current capabilities, ensuring compatibility with the existing control loop and thermal design requirements before substitution.