Analog DevicesLTC7892AUJM#WTRPBFControladores de CC a CC

The LTC7893/LTC7892 are high-performance, step-up DC-to-DC switching regulator controllers that drive all N-channel synchronous gallium nitride (GaN) field-effect transistor (FET) power stages from output voltages of up to 100V.

The LTC7893/LTC7892 solves many of the challenges traditionally faced when using GaN FETs. It simplifies the application design while requiring no protection diodes and no other additional external components compared to a silicon metal-oxide-semiconductor field effect transistor (MOSFET) solution.

The Internal smart bootstrap switches prevent overcharging of the BOOSTx pin to the SWx pin the high-side driver supplies during dead times, protecting the gate of the top GaN FET. The dead times of the LTC7893/LTC7892 can optionally be optimized with external resistors for margin or to tailor the application for higher efficiency and allowing for high-frequency operation.

The gate drive voltage of the LTC7893/LTC7892 can be precisely adjusted from 4V to 5.5V to optimize performance and allow the use of different GaN FETs or even logic-level MOSFETs. When biased from the boost converter regulator output, the LTC7893/LTC7892 can operate from an input supply as low as 1V after start-up.

Key Features and Benefits

• •  GaN Drive Technology fully Optimized for GaN FETs
• •  Output Voltage up to 100V
• •  Wide V_IN Range: 4V to 60V and Operates Down to 1V After Start-Up
• •  No Catch, Clamp, or Bootstrap Diodes Needed
• •  Internal Smart Bootstrap Switches Prevent Overcharging of High-Side Driver Supplies
• •  Resistor Adjustable Dead Times
• •  Split Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths
• •  Accurate Adjustable Driver Voltage and UVLO
• •  Low Operating I_Q: 15μA
• •  Programmable Frequency (100kHz to 3MHz)
• •  Synchronizable Frequency (100kHz to 3MHz)
• •  Spread Spectrum Frequency Modulation
• •  28-Lead (4mm × 5mm), Side Wettable, QFN Package (LTC7893)
• •  40-Lead (6mm × 6mm), Side Wettable, QFN Package (LTC7892)
• •  AEC-Q100 Qualified for Automotive Applications

Applications

• •  Automotive and Industrial Power Systems
• •  Military Avionics and Medical Systems
• •  Telecommunications Power Systems

Evaluation Board

The LTC7893/LTC7892 can be evaluated with the EVAL-LTC7893-AZ and the EVAL-LTC7892-BZ, respectively.

Block Diagrams and Tables