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  Richtek Technology Electronic Components Datasheet  

RT9605B Datasheet

Triple-Channel Synchronous-Rectified Buck MOSFET Driver

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RT9605B pdf
®
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


  Richtek Technology Electronic Components Datasheet  

RT9605B Datasheet

Triple-Channel Synchronous-Rectified Buck MOSFET Driver

No Preview Available !

RT9605B pdf
RT9605B
Typical Application Circuit
PHASE2
L1
0.5µH
12V
1µH
R19 2.2
C16
3.3µF
VIN
Q3
Q1 Q2
C1
33pF
Optional
R2 C2
C8
1000µF
5VSB
C4
4.7µF
C9
1µF
C10 to C13
1500µF x 4
D1
C15
C14
1µF
R18
0
1µF
12V
R20
0
17 19 21 20 3
R1
15k
C3
10nF
R3 3k
5 3 16 13
VID5
VID0
VID1
VID2
VID3
VID4
R4 110k
R5 56k
R6 27k
R7 13k
R8 6.8k
R9 3.3k
R10 5.1k
RDROOP 6 PI
2 DACQ
R11
1.8k
1 DACFB
9 PGOOD
R12
10k
RT8800
GND
3.3V
12V
R13 27k 4
R14
3k
78
R15
16k
PWM3 15
PWM2 14
ISP3 10
ISP2 11
R16
Optional
C5 1µF
12 Optional
C6
1µF
Optional
430
R17
R17
Optional
RICOMMON2
RICOMMON1
C7
1µF
VCORE
16 BOOT2
7 PWM3
PHASE3
5 PWM2
4 PWM1
2 BOOT1
R
RT9605B
GND
R25
LGATE3 14 0
PVCC3 15
C21
1µF
PHASE3 11 12V
UGATE3 10
R26
0
BOOT3
9
C22
1µF
D3
Q7 PHASE3
C23
3.3nF
Q8
R27
2.2
L2
0.5µH
Q9
VIN
PHASE2
R
PHASE1
R
1
C17
1µF
D2
24 22 23 8 R23 10
R21
0
12V C18
1µF
R22
0 C19 1µF
Q4 Q5
VIN
R24
2.2
C20
Q6
3.3nF
5VSB
PHASE1
L3
0.5µH
C24 to C35
1000µF x 12
C36 to C39
10µF x 4
VCORE
Functional Pin Description
UGATE1 (Pin 1), UGATE2 (Pin 17), UGATE3 (Pin 10)
Upper Gate Drive Output. Should be connected to the
upper MOSFET gate.
VDD (Pin 8)
Supply Input. Connect to +5V stand-by power. Place a
bypass capacitor between this pin and GND.
BOOT1 (Pin 2), BOOT2 (Pin 16), BOOT3 (Pin 9)
Floating bootstrap supply pin for the upper gate drive.
Connect the bootstrap capacitor between this pin and the
PHASE pin. The bootstrap capacitor provides the charge
to turn on the upper MOSFET.
NC (Pin 3)
No connected.
PHASE1 (Pin 24), PHASE2 (Pin 19), PHASE3 (Pin 11)
Upper driver return. Should be connected to the common
node of upper and lower MOSFETs. The PHASE voltage
is monitored for adaptive shoot-through protection.
LGATE1 (Pin 23), LGATE2 (Pin 20), LGATE3 (Pin 14)
Lower Gate Drive Output. Should be connected to the lower
MOSFET gate.
PWM1 (Pin 4), PWM2 (Pin 5), PWM3 (Pin 7)
PWM input control signal. Connect this pin to the PWM
output of the controller. If the PWM signal enters and
remains within the shutdown window, are both UGATE
and LGATE are drived low, disabling the output MOSFETs.
GND (Pin 6, 12, 13, 18 )
Chip power ground.
PVCC1 (Pin 22), PVCC2 (Pin 21), PVCC3 (Pin 15)
Supply Input. Connect to +12V supply. Place a bypass
capacitor between this pin and PGND.
Exposed Pad
Exposed pad should be soldered to PCB board and
connected to GND.
www.richtek.com
2
All brandname or trademark belong to their owner respectively
DS9605B-04 May 2014


Part Number RT9605B
Description Triple-Channel Synchronous-Rectified Buck MOSFET Driver
Maker Richtek Technology Corporation
Total Page 13 Pages
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