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RT9624A 데이터시트 PDF




Richtek에서 제조한 전자 부품 RT9624A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 RT9624A 기능
기능 Single Phase Synchronous Rectified Buck MOSFET Driver
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RT9624A 데이터시트, 핀배열, 회로
®
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
R1
12V
C1
Chip Enable
PWM
Controller
RT9624A
VCC
BOOT
R2
UGATE
EN PHASE
PWM LGATE
GND
CBOOT
R3
R4
C5 C6
VIN
Q1
L1
VOUT
R5
Q2
C2
C3 C4
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9624A-06 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1




RT9624A pdf, 반도체, 판매, 대치품
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 ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS9624A-06 December 2013

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RT9624A 전자부품, 판매, 대치품
Typical Application Circuit
RT9624A
R1
RT9624A
R2
2.2
12V
VCC
C1
1µF
BOOT
1
CBOOT
1µF R3
2.2
UGATE
Chip Enable
PWM
Controller
EN PHASE
PWM LGATE
GND
R4
0
C5
1000µF
x3
Q1 L1
1µH
R5
2.2
Q2
C2
3.3nF
C6
10µF
x4
VIN
12V
C3
2200µF
x2
VOUT
C4
10µF
x2
Timing Diagram
PWM
LGATE
tLGATEpdl
90%
1.5V
UGATE
1.5V
tUGATEpdh
tUGATEpdl
1.5V
90%
1.5V
tLGATEpdh
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9624A-06 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
7

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