®
RT9624A
Single Phase Synchronous Rectified Buck MOSFET Driver
General Description
The RT9624A is a high frequency, synchronous rectified,
single phase MOSFET driver designed for normal MOSFET
driving applications and high performance CPU VR driving
capabilities.
The RT9624A can be supplied from 4.5V to 13.2V. The
applicable power stage VIN range is from 5V to 24V. The
RT9624A also builds in an internal power switch to replace
external bootstrap diode.
The RT9624A can support switching frequency efficiently
up to 500kHz. The RT9624A has both the UGATE and
LGATE driving circuits for synchronous rectified DC/DC
converter applications. The shoot through protection
mechanism is designed to prevent shoot through between
high side and low side power MOSFETs. The RT9624A
has tri-state PWM input with shutdown and EN input
shutdown functions, which can force driver to output low
UGATE and LGATE signals.
The RT9624A comes in a small footprint with 8-pin
packages. The choice of package types includes SOP-8,
SOP-8 (Exposed Pad) and WDFN-8L 3x3.
Features
Drive Two N-MOSFETs
Shoot Through Protection
Embedded Bootstrap Diode
Support High Switching Frequency
Fast Output Rising Time
Tri-State PWM Input for Output Shutdown
Enable Control
Small SOP-8, SOP-8 (Exposed Pad) and 8-Lead
WDFN Packages
RoHS Compliant and Halogen Free
Applications
Core Voltage Supplies for Desktop, Motherboard CPU
High Frequency Low Profile DC/DC Converters
High Current Low Voltage DC/DC Converters
Core Voltage Supplies for GFX Card
Simplified Application Circuit
RT9624A
12V
R1
C1
UGATE
Chip Enable
PWM
Controller
EN
PWM
PHASE
+
VCC
BOOT
R2
C
BOOT
R3
Q1
V
IN
C5
C6
L1
V
OUT
R5
Q2
C2
R4
LGATE
GND
C3
C4
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9624A-07 July 2015
www.richtek.com
1
RT9624A
Ordering Information
RT9624A
Package Type
S : SOP-8
SP : SOP-8 (Exposed Pad-Option1)
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
Richtek products are :
½
Pin Configurations
(TOP VIEW)
BOOT
PWM
EN
VCC
2
3
4
8
7
6
5
UGATE
PHASE
GND
LGATE
SOP-8
BOOT
PWM
EN
VCC
2
3
4
8
UGATE
PHASE
GND
LGATE
GND
9
7
6
5
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.
½
SOP-8 (Exposed Pad)
BOOT
PWM
EN
VCC
UGATE
PHASE
GND
LGATE
1
2
3
4
8
GND
9
Marking Information
RT9624AZS
RT9624AZS : Product Number
7
6
5
WDFN-8L 3x3
RT9624A
ZSYMDNN
YMDNN : Date Code
RT9624AZSP
RT9624AZSP : Product Number
RT9624A
ZSPYMDNN
YMDNN : Date Code
RT9624AZQW
00 : Product Code
00 YM
DNN
YMDNN : Date Code
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9624A-07 July 2015
RT9624A
Function Pin Description
Pin No.
SOP-8
1
2
3
4
5
6
7
8
SOP-8 (Exposed Pad) /
WDFN-8L 3x3
1
2
3
4
5
6,
9 (Exposed Pad)
7
8
Pin Name
BOOT
PWM
EN
VCC
LGATE
GND
PHASE
UGATE
Pin Function
Bootstrap Supply for High Side Gate Drive.
PWM Signal Input. Connect this pin to the PWM output of the
controller.
Chip Enable (Active High). When this pin is low, both UGATE
and LGATE are driven to low.
Supply Voltage Input.
Low Side Gate Driver Output. Connect this pin to the Gate of
low side power N-MOSFET.
Ground. The exposed pad must be soldered to a large PCB
and connected to GND for maximum power dissipation.
Connect this pin to the Source of the high side N-MOSFET
and the Drain of the low side N-MOSFET.
High Side Gate Drive Output. Connect this pin to the Gate of
high side power N-MOSFET.
Function Block Diagram
EN
VCC
Internal
VDD
Enable
Detect
POR
Bootstrap
Control
BOOT
Shoot-Through
Protection
UGATE
PWM
Tri-State
Detect
Turn Off
Detection
VCC
Shoot-Through
Protection
PHASE
LGATE
GND
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9624A-07 July 2015
www.richtek.com
3
RT9624A
Operation
POR (Power On Reset)
POR block detects the voltage
the
VCC pin. When the
VCC pin voltage is higher than POR rising threshold, POR
block output is high. POR output is low when VCC is not
higher than POR rising threshold. When the POR block
output is high, UGATE and LGATE can be controlled by
PWM input voltage. If the POR block output is low, both
UGATE and LGATE will be pulled to low.
Enable Detect
When EN pin input voltage is higher/lower than EN rising
threshold, MOSFET driver is enabled/disabled. When the
EN input and POR output are high, UGATE and LGATE
can be controlled by PWM input voltage. When EN input
is low, both UGATE and LGATE are pulled to low.
Tri-State Detect
When both POR block output and EN pin voltages are
high, UGATE and LGATE can be controlled by PWM input.
There are three PWM input modes, which are high, low,
and shutdown state. If PWM input is within the shutdown
window, both UGATE and LGATE output are low. When
PWM input is higher than its rising threshold, UGATE is
high and LGATE is low. When PWM input is lower than
its falling threshold, UGATE is low and LGATE is high.
Bootstrap Control
Bootstrap control block controls the integrated bootstrap
switch. When LGATE is high (low side MOSFET is turned
on), the bootstrap switch is turned on to charge the
bootstrap capacitor connected to BOOT pin. When LGATE
is low (low side MOSFET is turned off), the bootstrap switch
is turned off to disconnect VCC pin and BOOT pin.
Turn-Off Detection
Turn-off detection block detects whether high side
MOSFET is turned off by monitoring PHASE pin voltage.
To avoid shoot through between high side and low side
MOSFETs, low side MOSFET can be turned on only after
high side MOSFET is effectively turned off.
Shoot-Through Protection
Shoot-through protection block implements the dead time
when both high side and low side MOSFETs are turned
off. With shoot-through protection block, high side and
low side MOSFET are never turned on simultaneously.
Thus, shoot through between high side and low side
MOSFETs is prevented.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9624A-07 July 2015
RT9624A
Absolute Maximum Ratings
(Note 1)
−0.3V
to 15V
−0.3V
to 15V
−0.3V
to 30V
−10V
to 35V
−0.3V
to (VCC + 0.3V)
Supply Voltage, VCC --------------------------------------------------------------------------------
BOOT to PHASE -------------------------------------------------------------------------------------
PHASE to GND
DC --------------------------------------------------------------------------------------------------------
< 100ns -------------------------------------------------------------------------------------------------
LGATE to GND
DC --------------------------------------------------------------------------------------------------------
< 100ns -------------------------------------------------------------------------------------------------
−2V
to (VCC + 0.3V)
UGATE to GND
DC -------------------------------------------------------------------------------------------------------- (V
PHASE
−
0.3V) to (V
BOOT
+ 0.3V)
< 100ns ------------------------------------------------------------------------------------------------- (V
PHASE
−
2V) to (V
BOOT
+ 0.3V)
EN, PWM to GND ------------------------------------------------------------------------------------
−0.3V
to 7V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 --------------------------------------------------------------------------------------------------- 0.833W
SOP-8 (Exposed Pad) ------------------------------------------------------------------------------ 1.333W
WDFN-8L 3x3 ----------------------------------------------------------------------------------------- 3.22W
Package Thermal Resistance (Note 2)
SOP-8,
θ
JA
--------------------------------------------------------------------------------------------- 120°C/W
SOP-8 (Exposed Pad),
θ
JA
------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad),
θ
JC
------------------------------------------------------------------------ 15°C/W
WDFN-8L 3x3,
θ
JA
------------------------------------------------------------------------------------ 31°C/W
WDFN-8L 3x3,
θ
JC
------------------------------------------------------------------------------------ 8°C/W
Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------- 260°C
Junction Temperature -------------------------------------------------------------------------------- 150°C
Storage Temperature Range -----------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
Supply Voltage, VCC -------------------------------------------------------------------------------- 4.5V to 13.2V
Input Voltage, (V
IN
+ VCC) ------------------------------------------------------------------------- < 35V
Junction Temperature Range -----------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range -----------------------------------------------------------------------
−40°C
to 85°C
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9624A-07 July 2015
www.richtek.com
5
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