A6727

Overview

The A6727 is a single-phase step-down controller with integrated high-current drivers, designed to realize general DC-DC converters in a compact SO-8 package. It supports power input (V_IN) as low as 1.5 V and device supply voltages from 5 V to 12 V. The device features a simple voltage mode control loop with an internal 0.8 V reference, ensuring ±1% output voltage accuracy over line and temperature variations. The oscillator is internally fixed at 300 kHz. Key protections include programmable overcurrent protection monitored across the low-side MOSFET R_DS(on), overvoltage/undervoltage protection, and FB disconnection protection. It also includes internal soft-start and a disable function.

Feature Summary

• Integrated high-current drivers for single-phase step-down conversion
• Sensorless and programmable overcurrent protection using low-side MOSFET R_DS(on)
• FB disconnection protection prevents excessive output voltages
• LS-less capability to manage pre-bias startup conditions

Applications

• Automotive applications requiring AEC-Q100 compliance
• General DC-DC converter implementations
• Systems requiring flexible power supply inputs from 5 V to 12 V

Procurement Notes

Verify the specific ordering suffix and revision level against the official STMicroelectronics datasheet before procurement. Confirm that the component meets the required AEC-Q100 grade if automotive qualification is necessary. Ensure the selected package variant matches the intended PCB layout constraints. Cross-reference the part number with current manufacturer availability status to avoid obsolescence risks during production planning.

Selection Notes

Select this controller when a compact solution for single-phase step-down conversion is required. It is suitable for designs needing input voltages as low as 1.5 V and supply rails between 5 V and 12 V. Choose this part if sensorless overcurrent protection via low-side MOSFET monitoring is preferred to save space and cost. Consider it for applications requiring precise voltage regulation with ±1% accuracy and built-in protections like FB disconnection and soft-start.

Part Context

The A6727 belongs to STMicroelectronics' portfolio of power management integrated circuits, specifically within the category of PWM controllers and DC-DC converters. It is designed to provide complete control logic, protection, and reference voltage functions in a small form factor. The component is part of a broader range of solutions aimed at simplifying system development through integrated features and compatibility with design aid utilities like eDesignSuite.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit designs if considering alternative components from other manufacturers or different ST product lines.