RT9629B Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Triple-Channel Synchronous Rectified Buck MOSFET Driver

®
RT9629B
Triple-Channel Synchronous Rectified Buck MOSFET
Driver
General Description
The RT9629B is a high frequency, triple-channel
synchronous rectified buck MOSFET driver specifically
designed to drive six power N-MOSFETs. The part is
promoted to pair with Richtek's multiphase buck PWM
controller family for high-density power supply
implementation. The output drivers of RT9629B can
efficiently switch power MOSFETs at frequency 300kHz
typically. Operating in higher frequency should consider
the thermal dissipation carefully. The device implements
bootstrapping on the upper gate with only an external
capacitor and a diode required. This reduces circuit
complexity and allows the use of higher performance, cost
effective N-MOSFETs. All drivers incorporate adaptive
shoot-through protection to prevent upper and lower
MOSFETs from conducting simultaneously and shorting
the input supply. The RT9629B has also detected the fault
condition during initial start-up before the multi-phase PWM
controller takes control. As a result, the input supply will
latch into the shutdown state. The RT9629B comes in a
small footprint package with WQFN-24L 5x5 package.
Features
z Drive Six N-MOSFETs for 3-Phase Buck PWM Control
z Shoot Through Protection
z Embedded Bootstrap Diode
z Support High Switching Frequency
z Fast Output Rising Time
z Tri-State PWM Input for Output Shutdown
z Small 24-Lead WQFN Package
z RoHS Compliant and Halogen 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
z Core Voltage Supplies for GFX Card
Marking Information
RT9629B
ZQW
YMDNN
RT9629BZQW : Product Number
YMDNN : Date Code
Simplified Application Circuit
12V
PWM1
PWM2
PWM3
VCCx
RT9629B
PHASE1
PWM1
PHASE2
PWM2
PWM3 PHASE3
GND
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9629B-03 October 2012
V_IN
L1
V_OUT
L2
L3
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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