AS7620B-BQFT-500

Overview

The AS7620B-BQFT-500 is a fixed-output synchronous buck switching regulator manufactured by ams OSRAM AG. It provides a stable 3.3V output with a maximum current capacity of 500mA. The device operates within an input voltage range of 3.6V to 32V, utilizing a hysteretic control topology for high efficiency up to 90%. Designed for surface-mount assembly, it is housed in a compact 12-VQFN package with a bare thermal pad, measuring 4x4 mm. The component supports an operating temperature range from -40°C to +85°C and includes integrated protection features such as thermal shutdown and output short-circuit protection.

Feature Summary

• Hysteretic step-down DC-DC converter architecture optimized for high efficiency and low-power operation
• Integrated thermal shutdown and output short-circuit protection mechanisms
• Ultra-low quiescent current consumption of 30µA during operation and 1µA in shutdown mode
• Supports 100% duty cycle operation for soft power fail behavior and extended hold-up time

Applications

• Industrial systems requiring wide input supply voltage ranges
• Medical equipment demanding maximum up-time and reliability
• Battery-backed critical applications needing extended hold-up time
• Systems requiring soft power fail behavior under varying load conditions

Procurement Notes

This component is officially listed as discontinued (EOL) by the manufacturer. Verification of final availability through authorized distributors is required. Designers should confirm end-of-life notices and transition timelines. Alternative sourcing may involve surplus markets or qualified substitute components. Ensure compliance with RoHS standards and check for any product change notifications affecting pin compatibility or electrical characteristics before procurement.

Selection Notes

Select this component for applications requiring a simple, high-efficiency solution with minimal external components. The fixed 3.3V output eliminates the need for feedback resistors. Consider the 32V maximum input rating for industrial environments. The 12-VQFN package requires adequate thermal management due to the bare pad design. Verify that the 500mA output current meets system peak demands, accounting for inductor saturation currents and thermal derating at elevated ambient temperatures.

Part Context

The AS7620 series represents a family of ultra-low ripple step-down DC/DC converters designed for ease of use and high performance. The AS7620B variant specifically targets applications where low idle current and high efficiency are paramount. Manufactured by ams OSRAM AG, these devices utilize asynchronous hysteretic control to minimize complexity while maintaining robust regulation across wide input voltage ranges, suitable for both industrial and medical sectors.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. As the AS7620B-BQFT-500 is discontinued, designers must evaluate alternative regulators based on input voltage range, output current, and package compatibility. Cross-reference tools suggest checking for compatible hysteretic buck converters with similar 3.3V fixed outputs and QFN packaging.