LT3070IUFD#PBF

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

The LT3070IUFD#PBF is a low voltage, UltraFast transient response linear regulator from Analog Devices. It supplies up to 5A of output current with a typical dropout voltage of 85mV. The device features digitally programmable output voltage selectable in 50mV increments over a range of 0.8V to 1.8V. It incorporates a unique tracking function via the VIOC pin to control a preceding buck regulator, maintaining input voltage at VOUT + 300mV to minimize power dissipation. Internal protections include UVLO, reverse-current protection, precision current limiting with power foldback, and thermal shutdown.

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

• Digitally programmable output voltage allows selection in 50mV increments across a 0.8V to 1.8V range.
• Integrated VIOC tracking function controls upstream buck regulators to optimize efficiency and minimize power dissipation.
• Low output noise performance achieved with a reference bypass capacitor, suitable for sensitive communication applications.
• Comprehensive internal protection mechanisms including precision current limiting with foldback, thermal shutdown, and reverse-current protection.

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

• FPGA and DSP Supplies
• ASIC and Microprocessor Supplies
• Servers and Storage Devices
• Post Buck Regulation and Supply Isolation

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

Verify the specific suffix #PBF indicates lead-free finish and RoHS compliance when sourcing. Confirm the package type matches the required 28-lead QFN footprint for PCB layout. Ensure the operating temperature range aligns with system requirements, as this variant supports -40°C to 125°C. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

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

Select this component for high-performance digital loads requiring precise voltage regulation and fast transient response. The digital margining capability allows system-level voltage adjustments without external resistors. Consider the thermal performance of the QFN package and ensure adequate PCB copper area for heat dissipation. Verify that the input voltage range and bias supply requirements are met by the system design.

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

This part belongs to the LT3070 series of low dropout regulators designed for high current applications. The IUFD designation specifies the industrial temperature grade and the plastic QFN package. It is manufactured by Analog Devices Inc., formerly Linear Technology, known for precision analog circuits. The series is optimized for powering sensitive digital logic where low noise and tight regulation are critical.

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

LT3070EUFD#PBF

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

How does the VIOC pin improve system efficiency?

The VIOC pin drives an upstream buck regulator to maintain the LT3070's input voltage at VOUT + 300mV. This minimizes the voltage differential across the LDO, thereby reducing power dissipation and maximizing overall system efficiency.

What is the purpose of the SENSE pin?

The SENSE pin serves as the Kelvin sense connection for the OUT pins. Connecting it to the load side of the output capacitors ensures optimum regulation by compensating for any voltage drop in the PCB traces between the regulator and the load.