The LTC7891 is a high performance, step-down, dc-to-dc switching regulator controller that drives all N-channel synchronous GaN FET power stages from input voltages up to 100 V. The LTC7891 solves many of the challenges traditionally faced when using GaN FETs.
The gate drive voltage of LTC7891can be precisely adjusted from 4 V to 5.5 V, making it suitable for low-voltage GaN and logic-level silicon FETs.
LTC7891 handles GaN gate‑drive challenges by:
- Using a smart bootstrap switch to prevent over‑voltage on the high‑side GaN gate.
- Automatically adjusting gate timing to achieve near‑zero dead time for higher efficiency.
- Allowing dead‑time tuning with external resistors for flexibility.
This eliminates the need for external clamping components while maintaining stable operation—even during extended dead times or negative switch-node spikes.
DC DC Switching Controllers | Power Management (PMIC) |DigiKey
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