RT9605B_14 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – Triple-Channel Synchronous-Rectified Buck MOSFET Driver

®
RT9605B
Triple-Channel Synchronous-Rectified Buck MOSFET Driver
General Description
The RT9605B 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 RT9605B can
efficiently switch power MOSFETs at frequency 300kHz
typically. Operating in higher frequency should consider
the thermal dissipation carefully. Each driver of RT9605B
is capable to drive a 3nF load in 30/40ns rising/falling
time with little propagation delay from input transition to
the gate of the power MOSFET. 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 RT9605B also detects the fault
condition during initial start-up prior to the multi-phase
PWM controller takes control. As a result, the input supply
will latch into the shutdown state. The RT9605B comes
to a small footprint package with VQFN-24L 4x4 package.
Ordering Information
RT9605B
Package Type
QV : VQFN-24L 4x4 (V-Type)
(Exposed Pad-Option 1)
Note :
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Features
 Drive Six N-MOSFETs for 3-Phase Buck PWM Control
 Adaptive Shoot-Through Protection
 Support High Switching Frequency
 Fast Output Rising/Falling Time
 Propagation Delay 40ns
 Tri-State Input for Bridge Shutdown
 Upper MOSFET Direct Short Protection
 Small 24-Lead VQFN Package
 RoHS Compliant and 100% Lead (Pb)-Free
Applications
 CPU Core Voltage Supplies on Motherboard
 High Frequency Low Profile DC/DC Converters
 High Current Low Voltage DC/DC Converters
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
UGATE1 1
18 GND
BOOT1 2
17 UGATE2
NC 3
PWM1 4
GND
16 BOOT2
15 PVCC3
PWM2 5
14 LGATE3
GND 6
13 GND
7 8 9 10 11 12
VQFN-24L 4x4
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9605B-04 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1