RT9618A Datasheet | Richtek

Description The RT9618/A are high frequency, dual MOSFET drivers specifically designed to drive two power N-MOSFETs in a synchronous-rectified buck converter topology. The drivers bined with Richtek’ s series of Multi-Phase Buck PWM controller form a plete core-voltage regulator solution for advanced micro-processors. The RT9618/A drive 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. RT9618A has longer UGATE/LGATE deadtime which can drive the MOSFETs with large gate RC value, avoiding the shoot-through phenomenon. RT9618 is targeted to drive low gate RC MOSFETs and performs better efficiency. The output drivers in the RT9618/A can efficiently switch power MOSFETs at frequency up to 500k Hz. Switching frequency above 500k Hz has to take into account the thermal dissipation of the packages. RT9618/A are capable to drive a 3n F load with a 30ns rise time. RT9618/A implements bootstrapping on the upper gate with an external capacitor and an embedded diode. This reduces implementation plexity and allows the use of higher performance, cost effective N-MOSFETs. Adaptive shootthrough protection is integrated to prevent both MOSFETs from conducting simultaneously. Pin Configurations (TOP VIEW) BOOT 8 UGATE 7 PHASE 6 PGND 5 LGATE SOP-8 BOOT 1 8 UGATE PWM 2 OD 3 VCC 4 GND 9 7 PHASE 6 PGND 5 LGATE WDFN-8L 3x3 DS9618/A-06 April 2011 Features z Drives Two N-MOSFETs z Adaptive Shoot-Through Protection z Embedded Boot Strapped Diode z Support High Switching Frequency z Fast Output Rise Time z Small SOP-8 and 8-Lead WDFN Package z Tri-State Input for Bridge Shutdown z Supply Under Voltage Protection z Upper MOSFET Direct Shorted Protection z Ro HS pliant and 100% Lead (Pb)-Free Applications z Core Voltage Supplies for Desktop, Motherboard CPU z High Frequency Low Profile DC-DC...