ADP3806JRUZ125R7

Overview

The ADP3806JRUZ125R7 is a synchronous buck controller from Analog Devices, designed for high-efficiency power conversion in demanding applications. It features an integrated 125V N-channel power MOSFET driver and supports input voltages up to 125V. The device operates with a fixed switching frequency of 400kHz, adjustable via an external resistor. It includes comprehensive protection mechanisms such as over-current, over-voltage, and thermal shutdown. The controller utilizes current-mode control for fast transient response and stability. Packaged in a thermally enhanced 28-lead TSSOP, it ensures reliable operation in compact designs requiring robust voltage regulation.

Feature Summary

• Integrated high-side and low-side gate drivers for synchronous buck topology
• Current-mode control architecture for improved line and load regulation
• Comprehensive protection suite including over-current, over-voltage, and thermal shutdown
• Fixed 400kHz switching frequency with external synchronization capability

Applications

• Industrial motor drives and controllers
• Telecommunications power systems
• Uninterruptible power supplies (UPS)
• High-power density DC-DC converters

Procurement Notes

Verify the exact suffix '125R7' against official Analog Devices documentation to confirm reel quantity and tape-and-reel specifications. Ensure the ordering part number matches the specific package variant and temperature range required for your design. Cross-reference with the latest datasheet revision to confirm pinout compatibility and electrical characteristics before finalizing procurement.

Selection Notes

Select this component when designing synchronous buck converters requiring input voltages up to 125V. It is suitable for applications needing high efficiency and fast transient response due to its current-mode control. Consider the 28-lead TSSOP package for thermal performance and board space constraints. Evaluate the fixed 400kHz frequency against EMI requirements and inductor size trade-offs.

Part Context

The ADP3806 belongs to Analog Devices' family of high-voltage synchronous buck controllers. It is engineered for industrial and telecom markets where reliability and efficiency are critical. The JRUZ125R7 designation specifies the lead-free, RoHS-compliant version in a tape-and-reel format. This series integrates power stage drivers to reduce external component count and simplify PCB layout.

Replacement Considerations

Check Analog Devices' official replacement guide for direct pin-to-pin compatible alternatives. Verify that any substitute maintains the 125V input rating and 400kHz switching frequency. Ensure thermal performance and protection features match the original design requirements before substitution.

FAQ

What is the maximum input voltage supported by the ADP3806?

The ADP3806 supports input voltages up to 125V.

Is the switching frequency adjustable on the ADP3806?

The ADP3806 operates at a fixed switching frequency of 400kHz, which can be set using an external resistor.