LTC3807EFE#PBF

LTC3807 is a synchronous buck DC-DC switching controller adopting constant frequency current-mode topology. EFE stands for extended industrial temperature grade and 20-lead exposed-pad TSSOP surface mount package. #PBF refers to lead-free tape-and-reel packaging designed for continuous automated SMT mass production.

This high-voltage step-down controller drives two N-channel synchronous power MOSFETs to build high-efficiency step-down power supplies. It accepts an ultra-wide input voltage range from 4 V to 38 V, compatible with 12V automotive batteries, 24V industrial bus power and various multi-cell battery packs.

Output voltage can be precisely configured between 0.8 V and 24 V via external resistor divider based on the internal 0.8V precision voltage reference, supporting output current up to 25 A with peak conversion efficiency reaching 95%.

Switching frequency is programmable from 50 kHz to 900 kHz, and the internal PLL circuit enables synchronization with external clock signals ranging 75 kHz to 750 kHz. Three light-load working modes are optional through dedicated pin setting: continuous conduction mode, pulse-skipping mode and Burst Mode. Burst Mode cuts no-load quiescent current down to only 50 μA, greatly extending the runtime of battery-powered equipment; shutdown mode leakage current is merely 14 μA.

The built-in OPTI-LOOP adaptive loop compensation simplifies peripheral circuit design and delivers fast transient response against sudden load changes. The TRACK/SS pin realizes programmable soft-start to suppress power-on inrush current, and also supports output voltage tracking for multi-rail power supply systems.

Comprehensive protection functions are fully integrated: foldback current limiting prevents excessive heat accumulation during output short circuit, thermal shutdown with hysteresis avoids chip over-temperature damage, power good pin monitors output voltage status in real time, and maximum 99% duty cycle ensures stable low-dropout operation under low input voltage conditions. Two independent internal LDOs supply power for gate driving circuits, which can take power from input voltage or external auxiliary power rail flexibly. Both resistive sensing and inductor DCR lossless current sensing schemes are available for selection.

Encapsulated in 20-pin thermally enhanced TSSOP plastic package with a central exposed thermal pad. The exposed pad is connected to signal ground, which remarkably improves heat dissipation during high-current continuous operation and strengthens PCB grounding performance for switching power circuits. Moisture Sensitivity Level is MSL1, no waiting period is required for reflow soldering procedures after the vacuum sealed package is opened. Standard continuous tape reel feeding matches automatic component placement equipment perfectly to realize uninterrupted large-scale electronic assembly production.

The junction temperature operating range covers -40 °C to +125 °C, maintaining stable reliable operation in industrial control equipment, automotive electronic modules, communication power supplies and field portable devices under drastic temperature variation and complex electromagnetic interference environments. Manufactured with full lead-free halogen-free fabrication processes, the component complies with RoHS 3 global environmental directives. High integration reduces the quantity of external discrete components and simplifies high-input wide-range step-down power supply hardware design.

Automotive always-on standby electronic systems and vehicle interior power conversion modules

Industrial distributed bus power supply and factory automation equipment power rails

Battery-powered portable test instruments and field data acquisition terminals

Communication base station auxiliary intermediate voltage conversion power units

Robotics, heavy construction machinery on-board power management systems