MOSFET Driver. RT9624D Datasheet

RT9624D Driver. Datasheet pdf. Equivalent

RT9624D Datasheet
Recommendation RT9624D Datasheet
Part RT9624D
Description Single Phase Synchronous Rectified Buck MOSFET Driver
Feature RT9624D; ® RT9624D Single Phase Synchronous Rectified Buck MOSFET Driver General Description The RT9624D is.
Manufacture Richtek
Datasheet
Download RT9624D Datasheet




Richtek RT9624D
®
RT9624D
Single Phase Synchronous Rectified Buck MOSFET Driver
General Description
The RT9624D is a high frequency, synchronous rectified,
single phase MOSFET driver designed for normal MOSFET
driving applications and high performance CPU VR driving
capabilities.
The RT9624D can be supplied from 4.5V to 13.2V. The
applicable power stage VIN range is from 5V to 24V. The
IC also builds in an internal power switch to replace
external bootstrap diode.
The RT9624D can support switching frequency efficiently
up to 500kHz. The IC 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 RT9624D has tri-state PWM
input with shutdown function, which can force driver to
output low UGATE and LGATE signals.
The RT9624D comes in a small footprint with
WDFN-8SL 2x2 package.
Features
Drive Two N-MOSFETs
Shoot-Through Protection
Embedded Bootstrap Switch
Support High Switching Frequency
Fast Output Rising Time
Tri-State PWM Input for Output Shutdown
Small 8-Lead WDFN Package
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
Marking Information
1B : Product Code
1BW
W : Date Code
Simplified Application Circuit
R1
12V
C1
PWM
Controller
RT9624D
VCC
BOOT
PWM
GND
UGATE
PHASE
LGATE
R2
CBOOT
R3
R4
C5 C6
VIN
Q1
L1
VOUT
R5
Q2
C2
C3 C4
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9624D-03 April 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9624D
RT9624D
Ordering Information
RT9624D
Package Type
QWA : WDFN-8SL 2x2 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Pin Configurations
(TOP VIEW)
BOOT 1
PWM 2
NC 3
VCC 4
8 UGATE
7 PHASE
6 GND
9 5 LGATE
WDFN-8SL 2x2
Function Pin Description
Pin No.
Pin Name
Pin Function
1 BOOT
2 PWM
3 NC
4 VCC
5 LGATE
6,
9 (Exposed Pad)
GND
7 PHASE
8 UGATE
Bootstrap Supply for High Side Gate Driver.
PWM Signal Input. Connect this pin to the PWM output of the controller.
No Internal Connection.
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 Driver Output. Connect this pin to the Gate of high side power
N-MOSFET.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9624D-03 April 2014



Richtek RT9624D
Function Block Diagram
VCC
RT9624D
Internal
VDD
POR
PWM
Tri-State
Detect
Bootstrap
Control
Shoot-Through
Protection
Turn Off
Detection
Shoot-Through
Protection
VCC
BOOT
UGATE
PHASE
LGATE
GND
Operation
POR (Power On Reset)
POR block detects the voltage at 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.
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 ©2014 Richtek Technology Corporation. All rights reserved.
DS9624D-03 April 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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