A6727TR

Overview

The A6727TR is a single-phase step-down switching controller from STMicroelectronics, designed for automotive applications. It operates with a fixed internal oscillator frequency of 300 kHz and supports an adjustable output voltage with ±1% accuracy. The device features a flexible power supply range of 5 V to 12 V and accepts power input as low as 1.5 V. It utilizes a compact SO-8 package and includes integrated high-current drivers. Key protection mechanisms include programmable overcurrent protection via low-side MOSFET RDS(on) monitoring, overvoltage/undervoltage protection, and FB disconnection protection.

Feature Summary

• Sensorless and programmable overcurrent protection utilizing low-side MOSFET RDS(on) monitoring
• FB disconnection protection prevents excessive output voltages when the feedback pin floats
• LS-less startup capability manages pre-bias conditions without requiring a low-side MOSFET
• Internal soft-start function reduces inrush current during initialization

Applications

• Automotive DC-DC converters
• General-purpose buck converter designs
• Systems requiring sensorless current sensing

Procurement Notes

Verify component status carefully as the A6727 series may be designated as Not Recommended for New Designs (NRND). Confirm that the TR suffix corresponds to the required reel packaging format for your assembly line. Ensure compatibility with AEC-Q100 qualification requirements if deploying in automotive environments. Cross-reference datasheet revisions to confirm feature consistency before finalizing procurement orders.

Selection Notes

Select this controller for applications requiring a simple voltage mode control loop with high integration. It is suitable where minimizing external sense resistors is critical for cost and space reduction. Consider the 300 kHz fixed frequency for EMI management and component sizing. Verify that the 8-SOIC package fits the thermal and spatial constraints of the target PCB layout.

Part Context

The A6727 belongs to STMicroelectronics' portfolio of single-phase PWM controllers. It shares architectural similarities with the L6726A but differs in oscillator frequency and specific protection implementations. Both devices utilize the SO-8 package and target similar DC-DC conversion needs, though the A6727 offers distinct timing characteristics and driver capabilities tailored for specific automotive and industrial power management scenarios.

Replacement Considerations

The L6726A is a related single-phase step-down controller from the same manufacturer. While it shares the SO-8 package and basic buck topology, it operates at a fixed 270 kHz frequency. Engineers must evaluate differences in error amplifier type and protection logic when substituting between these models.