RT9605A Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – Triple-Channel Synchronous-Rectified Buck MOSFET Driver

Preliminary
RT9605A
Triple-Channel Synchronous-Rectified Buck MOSFET Driver
General Description
The RT9605A 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 RT9605A can
efficiently switch power MOSFETs at frequency 300kHz
typically. Operating in higher frequency should consider
the thermal dissipation carefully. Each driver of RT9605A
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 RT9605A 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 RT9605A comes
to a small footprint package with VQFN-24L 4x4 package.
Ordering Information
RT9605A
Package Type
QV : VQFN-24L 4x4 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free and Green 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.
`100% matte tin (Sn) plating.
Features
z Drive Six N-MOSFETs for 3-Phase Buck PWM Control
z Adaptive Shoot-Through Protection
z Support High Switching Frequency
z Fast Output Rise/Fall Time
z Propagation Delay 40ns
z Tri-State Input for Bridge Shutdown
z Upper MOSFET Direct Short Protection
z Small 24-Lead VQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z CPU Core Voltage Supplies on Motherboard
z High Frequency Low Profile DC-DC Converters
z 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, otherwise visit our website for detail.
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
GND 6
14 LGATE3
25 _{13 GND}
7 8 9 10 11 12
VQFN-24L 4x4
DS9605A-05 August 2007
All brandname or trademark belong to their owner respectively
www.richtek.com
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