MOSFET Driver. RT9624C Datasheet

RT9624C Driver. Datasheet pdf. Equivalent

RT9624C Datasheet
Recommendation RT9624C Datasheet
Part RT9624C
Description Single Phase Synchronous Rectified Buck MOSFET Driver
Feature RT9624C; .
Manufacture Richtek
Datasheet
Download RT9624C Datasheet




Richtek RT9624C
®
RT9624C
Single Phase Synchronous Rectified Buck MOSFET Driver
General Description
The RT9624C is a high frequency, synchronous rectified,
single phase MOSFET driver designed for normal MOSFET
driving applications and high performance CPU VR driving
capabilities.
The RT9624C can be supplied from 4.5V to 13.2V. The
applicable power stage VIN range is from 5V to 24V. The
RT9624C also builds in an internal power switch to replace
external bootstrap diode.
The RT9624C can support switching frequency efficiently
up to 500kHz. The RT9624C 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 RT9624C
has tri-state PWM input with shutdown and EN input
shutdown functions, which can force driver to output low
UGATE and LGATE signals.
The RT9624C 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
Enable Control
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
1C : Product Code
1CW
W : Date Code
Simplified Application Circuit
R1
12V
C1
Chip Enable
PWM
Controller
RT9624C
VCC
BOOT
R2
UGATE
EN PHASE
PWM LGATE
GND
CBOOT
R3
R4
C5 C6
VIN
Q1
L1
VOUT
R5
Q2
C2
C3 C4
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9624C-04 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9624C
RT9624C
Ordering Information
RT9624C
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
PWM
EN
VCC
1
2
3
4
8 UGATE
7 PHASE
6 GND
9 5 LGATE
WDFN-8SL 2x2
Function Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap Supply for High Side Gate Driver.
2
PWM
PWM Signal Input. Connect this pin to the PWM output of the controller.
3 EN
Chip Enable (Active High). When this pin is low, both UGATE and LGATE are
driven to low.
4 VCC Supply Voltage Input.
5 LGATE
6,
9 (Exposed Pad)
GND
7 PHASE
8 UGATE
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 ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9624C-04 July 2015



Richtek RT9624C
Function Block Diagram
EN VCC
RT9624C
Internal
VDD
Enable
Detect
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.
Enable Detect
When EN pin input voltage is higher than EN rising
threshold, MOSFET driver is enabled. 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.
DS9624C-04 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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