RT6256BHGQUF

Overview

The RT6256BHGQUF is a synchronous step-down converter with an integrated 3.3V LDO, manufactured by Richtek USA Inc. It operates within an input voltage range of 4.5 V to 23 V and delivers up to 6 A output current at a fixed 3.3 V level. The device features a switching frequency of 500 kHz and a typical quiescent current of 100 uA. It is housed in a 12-UQFN-HL package and supports operating temperatures from -40°C to +125°C.

Feature Summary

• Integrates a high-current synchronous buck converter with a dedicated low-dropout regulator for dual power rail generation.
• Operates with a wide input voltage range suitable for various system power distribution architectures.
• Features compact surface-mount packaging designed for space-constrained printed circuit board layouts.

Applications

• Industrial control systems requiring stable multi-voltage power supplies
• Consumer electronics utilizing single-rail input power sources
• Embedded computing modules needing efficient DC-DC conversion

Procurement Notes

Verify the specific suffix HGQUF against the manufacturer's datasheet to confirm pinout compatibility and thermal pad requirements. Ensure that the ordering documentation explicitly references the RT6256B variant rather than the CH variant, as internal specifications differ. Confirm moisture sensitivity level handling procedures during assembly to prevent package damage.

Selection Notes

Select this component when a combined buck and LDO solution is required to reduce bill of materials count. The fixed 3.3V output simplifies design compared to adjustable regulators. Consider the 500 kHz switching frequency for balancing efficiency and external component size. Verify that the 6A current rating meets peak load demands without exceeding thermal limits in the UQFN-HL package.

Part Context

This part belongs to the RT6256 family of power management ICs from Richtek. It is distinct from the RT6256CHGQUF, which utilizes a 750 kHz switching frequency and may have different electrical characteristics. The B variant specifically integrates a 3.3V LDO, whereas other variants might offer different LDO outputs or configurations.

Replacement Considerations

The RT6256BHFN-B is listed as an alias for this part number. Direct substitution with the RT6256CHGQUF requires verification of switching frequency differences and potential layout adjustments due to varying electrical parameters between the B and C series.

FAQ

What is the fixed output voltage of the integrated LDO?

The integrated LDO provides a fixed 3.3 V output voltage.

Does the RT6256BHGQUF support adjustable output voltages?

No, the primary buck converter output is fixed at 3.3 V; it does not support external resistor adjustment.