LT3507AIUHF#TRPBF

Overview

The LT3507AIUHF#TRPBF is a monolithic switching regulator featuring three buck converters and one low-dropout linear regulator. It operates from an input voltage range of 4V to 36V with adjustable outputs. The device integrates a 2.5MHz fixed-frequency oscillator for the buck channels, while the LDO provides clean power. Output currents reach 2.7A for the primary buck channel and 1.8A for the secondary channels. It utilizes a 38-lead QFN package rated for operation between -40°C and +125°C.

Feature Summary

• Integrates three high-efficiency synchronous buck converters alongside a single low-noise LDO within a compact footprint.
• Features a fixed 2.5MHz switching frequency that minimizes external passive component size requirements.
• Includes internal soft-start circuitry to limit inrush current during startup sequences.
• Provides thermal shutdown protection to safeguard the device under excessive temperature conditions.

Applications

• Point-of-load regulation in industrial control systems
• Power distribution networks for embedded computing hardware
• Bias supply generation for communication equipment
• Multi-rail power sequencing in automotive electronics

Procurement Notes

Verify the specific suffix #TRPBF confirms tape and reel packaging when sourcing components. Confirm the 'A' grade designation matches required electrical tolerances and temperature ranges against the official datasheet specifications. Ensure the 38-QFN footprint aligns with the target PCB layout constraints before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring multiple regulated rails from a single unregulated source. The integrated LDO complements the switching regulators by providing noise-sensitive loads. Evaluate thermal performance based on the total power dissipation across all four output channels within the specified ambient temperature range.

Part Context

This part belongs to the LT3507A family of multi-output power management ICs designed by Analog Devices. It consolidates multiple voltage regulation functions into a single solution, reducing board space compared to discrete implementations. The series supports various package options including TSSOP and QFN variants for different thermal and spatial requirements.

Replacement Considerations

LT3507AHUHF#PBF

FAQ

What is the switching frequency of the buck converters?

The buck converters operate at a fixed frequency of 2.5MHz.

Does the device include overcurrent protection?

Yes, each channel features cycle-by-cycle current limiting to protect against short circuits.