TPS51285ARUKR

Overview

The TPS51285ARUKR is a dual synchronous step-down controller manufactured by Texas Instruments, designed for high-efficiency power conversion in compact form factors. It operates with a switching frequency range of 400 kHz to 475 kHz and supports output currents up to 20 A per channel. The device accepts input voltages from 4.5 V to 5.5 V and delivers regulated outputs within the same voltage window. Packaged in a WQFN-20 surface-mount footprint, it functions reliably across an operating temperature range of -40°C to +85°C, featuring low quiescent current consumption of 84 µA.

Feature Summary

• Dual synchronous buck architecture enabling independent regulation of two output channels
• Integrated ultra-low quiescent current operation for enhanced light-load efficiency
• Built-in soft-start functionality to limit inrush current during initialization
• Comprehensive protection features including overcurrent, thermal, and undervoltage lockout

Applications

• Portable computing devices requiring efficient multi-rail power distribution
• Industrial control systems needing reliable step-down voltage regulation
• Communication infrastructure equipment utilizing synchronous rectification
• Embedded systems demanding compact power management solutions

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package marking matches the specified WQFN-20 configuration. Check datasheet revisions for any updates to electrical characteristics or recommended operating conditions before integration into production designs.

Selection Notes

Evaluate thermal performance requirements against the WQFN-20 package capabilities when designing PCB layouts. Ensure input capacitor selection supports the 400 kHz to 475 kHz switching frequency range. Consider external component values for optimal transient response and stability margins based on load conditions.

Part Context

This component belongs to the TPS51285B series of dual synchronous step-down controllers. It shares architectural similarities with the TPS51285A variant but offers specific optimizations for ultra-low quiescent current applications. The family targets modern portable and industrial electronics requiring efficient power management in small footprints.

Replacement Considerations

• TPS51285BRUKT

FAQ

What is the maximum switching frequency supported by this controller?

The device supports a switching frequency range from 400 kHz to 475 kHz.

Does the TPS51285ARUKR include integrated LDO regulators?

No, this specific variant is a dual synchronous step-down controller without integrated LDOs, unlike some other variants in the broader family.