CS5231-3GDPR5

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The CS5231-3GDPR5 is a fixed 3.3 V linear regulator with auxiliary control, manufactured by onsemi in the D2PAK-5 package. It provides a regulated output of 3.3 V ± 2.0% at up to 500 mA. The device features a composite PNP-NPN pass transistor for low dropout voltage and includes current limit protection, thermal shutdown with hysteresis, and reverse output current limitation. Designed for system power management, it manages two input supplies, switching between a main 5.0 V supply and a 3.3 V auxiliary source via an external PFET controlled by the AuxDrv pin.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Combines a three-terminal linear regulator with circuitry controlling an external PFET transistor to manage two input supplies.
• Provides glitch-free transition between main and auxiliary power sources to ensure uninterrupted load power.
• Includes internal current limit and thermal shutdown protection with hysteresis for fault safety.
• Designed for low reverse current to prevent excessive flow from output to input or ground.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Powering ASICs on PCI Network Interface Cards (NICs)
• Desktop computer power systems
• PCMCIA/PCI interface cards

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the ordering suffix 'R5' corresponds to the Tape & Reel packaging configuration as specified in the official datasheet. Confirm the manufacturer is onsemi (Semiconductor Components Industries, LLC). Ensure the component meets the required D2PAK-5 package dimensions and lead configuration for your PCB layout.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.3 V output with 500 mA capability is required alongside auxiliary power switching. It is suitable for applications needing compliance with ACPI standards for instantly available power. Consider the D2PAK-5 package for its thermal performance compared to smaller packages if heatsinking constraints allow.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the CS5231-3 series of linear regulators with auxiliary control. It is designed to meet Intel's Instantly Available power requirements following ACPI standards. The series includes variants in both D2PAK-5 and SOIC-8 packages, offering flexibility for different board space and thermal management needs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include CS5231-3GDP5 (same function, rail packaging) and CS5231-3 (generic series designation). Verify pin compatibility and thermal characteristics when replacing with other 3.3V linear regulators featuring auxiliary drive capabilities.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How does the CS5231-3 handle transitions between the main and auxiliary supplies?

It uses the AuxDrv pin to control an external PFET. When VIN drops below 4.5 V, AuxDrv activates the PFET, switching the load to the auxiliary supply without glitches.

What is the maximum input voltage for the CS5231-3?

The absolute maximum operating input voltage is 14 V, though the specification range is typically 4.75 V to 6.0 V.