140V, Low I

The LTC®7897 is a high performance, 100% duty cycle capable, synchronous step-down, DC/DC switching regulator controller that drives all N-channel synchronous silicon metal oxide field effect transistor (MOSFET) power stages. Synchronous rectification increases efficiency, reduces power loss, and simplifies the application design by reducing thermal requirements.

The wide input and output voltage ranges of the LTC7897 enable not only high step-down ratios but also a wide range of positive to negative voltage conversion. The gate drivers of the LTC7897 provide robustness with a 14V ABS MAX rating and flexibility with adjustable drive levels and dead times to optimize applications.

The gate drive voltage of the LTC7897 can optionally be adjusted from 5V to 10V to allow use of logic-level or standard threshold MOSFETs. The dead times of the LTC7897 can be optimized with external resistors for margin or to tailor the application for higher efficiency and allow for high frequency operation.

Applications

* Industrial Power Systems

* Military/Avionics

* Telecommunications Power Systems

* Wide VIN Range: 4V to 135V (140V ABS MAX)

* Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)

* Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 14V ABS MAX)

* Adjustable Driver Voltage UVLO

* Adaptive or Resistor Adjustable Dead Times

* Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths