MOSFET Driver. RT9624F Datasheet

RT9624F Driver. Datasheet pdf. Equivalent

RT9624F Datasheet
Recommendation RT9624F Datasheet
Part RT9624F
Description Single Phase Synchronous Rectified Buck MOSFET Driver
Feature RT9624F; ® RT9624F Single Phase Synchronous Rectified Buck MOSFET Driver General Description The RT9624F is.
Manufacture Richtek
Datasheet
Download RT9624F Datasheet




Richtek RT9624F
®
RT9624F
Single Phase Synchronous Rectified Buck MOSFET Driver
General Description
The RT9624F is a high frequency, synchronous rectified,
single phase MOSFET driver designed for normal MOSFET
driving applications and high performance CPU VR driving
capabilities.
The RT9624F 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 RT9624F can support switching frequency efficiently
up to 500kHz. The IC has both 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 RT9624F has tri-state
PWM input with shutdown function, which can force driver
to output low UGATE and LGATE signals.
The RT9624F is available in a small footprint WDFN-8L
3x3 package.
Marking Information
4P=YM
DNN
4P= : Product Code
YMDNN : Date Code
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
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
Ordering Information
RT9624F
Package Type
QW : WDFN-8L 3x3 (W-Type)
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.
Simplified Application Circuit
R1
12V
C1
PWM
Controller
RT9624F
VCC
BOOT
PWM
GND
UGATE
PHASE
LGATE
R2
CBOOT
R3
R4
C5 C6
VIN
Q1
L1
VOUT
R5
Q2
C2
C3 C4
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9624F-02 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9624F
RT9624F
Pin Configurations
(TOP VIEW)
PWM 1
GND 2
NC 3
VCC 4
8 BOOT
7 UGATE
6 PHASE
9 5 LGATE
WDFN-8L 3x3
Function Pin Description
Pin No.
Pin Name
Pin Function
1
PWM
PWM Signal Input. Connect this pin to the PWM output of the controller.
2,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
3 NC No Internal Connection.
4
VCC
Supply Voltage Input.
5
LGATE
Low-Side Gate Driver Output. Connect this pin to the Gate of low-side power
N-MOSFET.
6
PHASE
Connect this pin to the Source of the high-side N-MOSFET and the Drain of the
low-side N-MOSFET.
7
UGATE
High-Side Gate Drive Output. Connect this pin to the Gate of high-side power
N-MOSFET.
8
BOOT
Bootstrap Supply for High-Side Gate Drive.
Function Block Diagram
VCC
Internal
VDD
POR
PWM
Tri-State
Detect
Bootstrap
Control
Shoot-Through
Protection
Turn Off
Detection
Shoot-Through
Protection
VCC
BOOT
UGATE
PHASE
LGATE
GND
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9624F-02 July 2015



Richtek RT9624F
Operation
POR (Power On Reset)
The POR block detects the voltage the VCC pin. When
the VCC pin voltage is higher than POR rising threshold,
the POR block output is high. The POR output is low
when VCC is not less 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
The 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.
RT9624F
Turn-Off Detection
The turn-off detection block detects whether high-side
MOSFET is turned off by monitoring the 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
The 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.
DS9624F-02 July 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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