AS7620B-BQFT

Overview

The AS7620B-BQFT is a high-voltage hysteretic step-down DC-DC converter manufactured by ams OSRAM AG. It operates in asynchronous mode with an input voltage range of 3.6V to 32V and provides a fixed positive output of 3.3V. The device supports up to 500mA output current and features low-power architecture for extended hold-up time. Key electrical parameters include a typical idle current of 30µA and shutdown current of 1µA. It offers 100% duty cycle capability for soft power fail behavior and includes output short-circuit protection and thermal shutdown.

Feature Summary

• Hysteretic control topology for high efficiency and simplified design
• High-voltage operation supporting industrial and medical systems
• Low quiescent current extending battery life in critical applications
• Integrated protection against short circuits and thermal overload

Applications

• Industrial systems requiring wide input voltage ranges
• Medical equipment demanding maximum up-time
• Battery-backed critical applications needing extended hold-up time
• Systems requiring soft power fail behavior

Procurement Notes

Verify component authenticity through authorized channels as the part status is listed as obsolete. Confirm package integrity upon receipt, specifically checking for damage to the 12-VQFN exposed pad. Review the latest Product Change Notification (PCN) or End-of-Life (EOL) notices from ams OSRAM AG for any manufacturing updates or final purchase deadlines. Ensure compatibility with existing PCB footprints before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring high-voltage input tolerance and asynchronous buck conversion. It is suitable where simplicity of hysteretic control outweighs the need for synchronous rectification. Consider the 3.3V fixed output constraint and 500mA current limit during circuit planning. Evaluate inductor selection carefully to optimize switching frequency and operating current based on specific load conditions.

Part Context

This device belongs to the AS7620 series of ultra-low ripple step-down DC/DC converters. It is designed for applications prioritizing reliability and efficiency over a wide input supply range. The series is optimized for 24V systems but supports higher voltages up to 32V. It represents a solution for maintaining system uptime in environments with fluctuating power supplies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.