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The RT9619/A is a high frequency, dual MOSFET driver specifically designed to drive two power N-Channel MOSFETs in a synchronous-rectified buck converter topology. This driver combined with Richtek's series of Multi-Phase Buck PWM controller form a complete core-voltage regulator solution for advanced micro-processors.
The RT9619/A drives both the lower/upper gate in a synchronous-rectifier bridge with 12V. This drive-voltage flexibility provides the advantage of optimizing applications involving trade-offs between switching losses and conduction losses.
RT9619A has longer UGATE/LGATE deadtime which can drive the MOSFETs with large gate RC value, avoiding the shoot-through phenomenon. RT9619 is targeted to drive low gate RC MOSFETs and performs better efficiency.
The output drivers in the RT9619/A can efficiently switch power MOSFETs at frequency up to 500kHz. Switching frequency above 500kHz has to take into account the thermal dissipation of SOP-8 package. RT9619/A is capable to drive a 3nF load with a 30ns rise time. RT9619/A implements bootstrapping on the upper gate with an external capacitor and an embedded diode. This reduces implementation complexity and allows the use of higher performance, cost effective N-Channel MOSFETs. Adaptive shoot-through protection is integrated to prevent both MOSFETs from conducting simultaneously.
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  • Drives Two N-Channel MOSFETs
  • Adaptive Shoot-Through Protection
  • Embedded Boot Strapped Diode
  • Supports High Switching Frequency
  • Fast Output Rise Time
  • Small SOP-8 Package
  • Tri-State Input for Bridge Shutdown
  • Supply Under Voltage Protection
  • RoHS Compliant and 100% Lead (Pb)-Free
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Core Voltage Supplies for Desktop, Motherboard CPU<br />High Frequency Low Profile DC-DC Converters<br />High Current Low Voltage DC-DC Converters
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