RT9607/A
Dual Channel Synchronous-Rectified Buck MOSFET Driver
General Description
The RT9607/A is a dual power channel MOSFET driver
specifically designed to drive four power N-MOSFETs in a
synchronous-rectified buck converter topology. These
drivers combined with RichTek’ s series of Multi-Phase
Buck PWM controllers provide a complete core voltage
regulator solution for advanced microprocessors.
The RT9607/A can
provide flexible gate driving for both
high side and low side drivers. This gives more flexibility
of MOSFET selection.
The output drivers of the part are capble to driver a 3nF
load in 30/40ns rising/falling time with fast propagation
delay from input transition to the gate of the power
MOSFET. This device implements bootstrapping on the
upper gates with only a single external capacitor required
for each power channel. This reduces implementation
complexity and allows the use of higher performance, cost
effective, N-MOSFETs. Adaptive shoot-through protect-ion
is integrated to prevent both MOSFETs from conducting
simultaneously.
The
RT9607/A can detect high side MOSFET drain-to-
source electrical short at power on and pull the 12V power
by low side MOS and cause power supply to go into over
current shutdown to prevent damage of CPU.
RT9607 has longer UGATE/LGATE dead time which can
drive the MOSFETs with large gate RC value, avoiding
the shoot-through phenomenon. RT9607A is targeted to
drive small gate RC value MOSFETs and performs better
efficiency.
Note :
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
Drives Four N-MOSFETs
Adaptive Shoot-Through Protection
Propagation Delay 40ns
Support High Switching Frequency
Fast Output Rise Time
5V to 12V Gate-Drive Voltages for Optimal Efficiency
Tri-State Input for Bridge Shutdown
Supply Under-Voltage Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Core Voltage Supplies for motherboard/desktop PC
microprocessor core power
High Frequency Low Profile DC-DC Converters
High Current Low Voltage DC-DC Converters
Ordering Information
RT9607/A
Package Type
QV : VQFN-16L 3x3 (V-Type)
S : SOP-14
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Short Dead Time
Long Dead Time
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9607/A-07 April 2011
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1
RT9607/A
Pin Configurations
(TOP VIEW)
PHASE1
PWM2
PWM1
VCC
16 15 14 13
GND
LGATE1
NC
PGND
1
2
3
4
5
6
7
8
12
UGATE1
BOOT1
BOOT2
UGATE2
GND
17
11
10
9
PWM1
PWM2
GND
LGATE1
PVCC
PGND
LGATE2
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
PHASE1
UGATE1
BOOT1
BOOT2
UGATE2
PHASE2
LGATE2
PHASE2
PVCC
NC
SOP-14
VQFN-16L 3x3
Typical Application Circuit
Optional
12V
12V
11
BOOT1
12
13
14
VCC
PVCC
5
UGATE1
PHASE1 PWM1 1
RT9607/A
From Controller
PWM1
4
V
CORE
9
8
7
LGATE1
UGATE2
PHASE2
LGATE2
PWM2
2
From Controller
PWM2
GND
PGND
3
6
BOOT2
10
Optional
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DS9607/A-07 April 2011
RT9607/A
Timing Diagram
PWM
LGATE
t
pdlLGATE
90%
2V
t
pdlUGATE
2V
90%
2V
UGATE
t
pdhUGATE
t
pdhLGATE
2V
Functional Pin Description
Pin No.
RT9607/A
□
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
--
--
RT9607/A
□
QV
15
16
1
2
5
4
6
7
9
10
11
12
13
14
3, 8
Pin Name
PWM1
PWM2
GND
LGATE1
PVCC
PGND
LGATE2
PHASE2
UGATE2
BOOT2
BOOT1
UGATE1
PHASE1
VCC
NC
Channel 1 PWM Input.
Channel 2 PWM Input.
Ground Pin.
Lower Gate Drive of Channel 1.
Upper and Lower Gate Driver Power Rail.
Lower Gate Driver Ground Pin.
Lower Gate Drive of Channel 2.
Connect this pin to phase point of Channel 2.
Phase point is the connection point of high side MOSFET source
Upper Gate Drive of Channel 2.
Floating Bootstrap Supply Pin of Channel 2.
Floating Bootstrap Supply Pin of Channel 1.
Upper Gate Drive of Channel 1.
Connect this pin to phase point of Channel 1.
Phase point is the connection point of high side MOSFET source
Control Logic Power Supply.
No Connection.
The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Pin Function
Exposed Pad (17) GND
DS9607/A-07 April 2011
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RT9607/A
Function Block Diagram
VCC
PVCC
Internal
5V
BOOT1
Shoot-Through
Protection
UGATE1
R
PWM1
R
Shoot-Through
Protection
PGND
PVCC
Shoot-Through
Protection
R
PWM2
R
Power-On OVP
PVCC
Shoot-Through
Protection
PHASE2
Power-On OVP
PVCC
PHASE1
LGATE1
Internal
5V
Control
Logic
PGND
BOOT2
UGATE2
LGATE2
GND
PGND
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DS9607/A-07 April 2011
RT9607/A
Absolute Maximum Ratings
(Note 1)
15V
V
CC
+ 0.3V
15V
GND - 0.3V to 7V
Supply Voltage, V
CC
-------------------------------------------------------------------------------------
Supply Voltage, PV
CC
-----------------------------------------------------------------------------------
BOOT Voltage, V
BOOT
-V
PHASE
-------------------------------------------------------------------------
Input Voltage, V
PWM
--------------------------------------------------------------------------------------
PHASE to GND
DC ------------------------------------------------------------------------------------------------------------
< 200ns -----------------------------------------------------------------------------------------------------
BOOT to GND
DC ------------------------------------------------------------------------------------------------------------
< 200ns -----------------------------------------------------------------------------------------------------
UGATE ------------------------------------------------------------------------------------------------------
LGATE ------------------------------------------------------------------------------------------------------
< 200ns -----------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
VQFN−16L 3x3 --------------------------------------------------------------------------------------------
SOP-14 -----------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
VQFN−16L 3x3,
θ
JA
--------------------------------------------------------------------------------------
SOP-14,
θ
JA
-----------------------------------------------------------------------------------------------
Storage Temperature Range ---------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------
ESD Susceptibility (Note 3)
HBM (Human Body Mode) -----------------------------------------------------------------------------
MM (Machine Mode) -------------------------------------------------------------------------------------
−
5V to 15V
−
10V to 30V
−
0.3V to V
CC
+ 15V
−
0.3V to 42V
V
PHASE
- 0.3V to V
BOOT
+ 0.3V
GND - 0.3V to V
PVCC
+ 0.3V
−
2V to V
CC
+ 0.3V
1.471W
0.909W
68°C/W
110°C /W
−
40°C to 150°C
260°C
2kV
200V
Recommended Operating Conditions
(Note 4)
Supply Voltage, V
CC
------------------------------------------------------------------------------------- 12V
±10%
Junction Temperature Range --------------------------------------------------------------------------- 0°C to 125°C
Ambient Temperature Range
--------------------------------------------------------------------------- 0°C to 70°C
Electrical Characteristics
(Recommended Operating Conditions, T
A
= 25°C unless otherwise specified)
Parameter
VCC Supply Current
Bias Supply Current
Power Supply Current
Power-On Reset
V
CC
Rising Threshold
Hysteresis
Symbol
Test Conditions
Min
Typ
Max
Units
I
VCC
I
PVCC
f
PWM
= 250kHz, V
PVCC
= 12V,
C
BOOT
= 0.1μF, R
PHASE
= 20Ω
f
PWM
= 250kHz, V
PVCC
= 12V,
C
BOOT
= 0.1μF, R
PHASE
= 20Ω
--
--
5.5
5.5
8.0
10.0
mA
mA
--
--
8.0
1.0
--
--
V
V
To be continued
DS9607/A-07 April 2011
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5
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