RT9619_11 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Synchronous-Rectified Buck MOSFET Drivers

RT9619/A
Synchronous-Rectified Buck MOSFET Drivers
General Description
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.
Pin Configurations
(TOP VIEW)
BOOT
PWM
NC
VCC
8
2
7
3
6
4
5
SOP-8
UGATE
PHASE
PGND
LGATE
Features
z Drives Two N-Channel MOSFETs
z Adaptive Shoot-Through Protection
z Embedded Boot Strapped Diode
z Supports High Switching Frequency
z Fast Output Rise Time
z Small SOP-8 Package
z Tri-State Input for Bridge Shutdown
z Supply Under Voltage Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Core Voltage Supplies for Desktop, Motherboard CPU
z High Frequency Low Profile DC-DC Converters
z High Current Low Voltage DC-DC Converters
Ordering Information
RT9619/A
Package Type
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Long Dead Time
Short Dead Time
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.
DS9619/A-06 April 2011
www.richtek.com
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