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RT9618A Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9618A Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 12 page  RT9618/A 1 DS9618/A-06 April 2011 www.richtek.com Features Drives Two N-MOSFETs Adaptive Shoot-Through Protection Embedded Boot Strapped Diode Support High Switching Frequency Fast Output Rise Time Small SOP-8 and 8-Lead WDFN Package Tri-State Input for Bridge Shutdown Supply Under Voltage Protection Upper MOSFET Direct Shorted Protection RoHS Compliant and 100% Lead (Pb)-Free Applications Core Voltage Supplies for Desktop, Motherboard CPU High Frequency Low Profile DC-DC Converters High Current Low Voltage DC-DC Converters Synchronous-Rectified Buck MOSFET Drivers General 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 combined with Richtek ’ s series of Multi-Phase Buck PWM controller form a complete 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 500kHz. Switching frequency above 500kHz has to take into account the thermal dissipation of the packages. RT9618/A are capable to drive a 3nF 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 complexity and allows the use of higher performance, cost effective N-MOSFETs. Adaptive shoot- through protection is integrated to prevent both MOSFETs from conducting simultaneously. Pin Configurations (TOP VIEW) SOP-8 Ordering Information 2 3 4 5 8 7 6 BOOT VCC OD PWM UGATE LGATE PGND PHASE Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. WDFN-8L 3x3 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. BOOT VCC PWM OD 7 6 5 1 2 3 4 8 GND 9 UGATE LGATE PGND PHASE RT9618/A Package Type S : SOP-8 QW : WDFN-8L 3x3 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Long Dead Time Short Dead Time |
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