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PDF RT9618A Data sheet ( Hoja de datos )
| Número de pieza | RT9618A | |
| Descripción | Synchronous-Rectified Buck MOSFET Drivers | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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RT9618/A
Synchronous-Rectified Buck MOSFET Drivers
General Description
The RT9618/A is a high frequency, dual MOSFET driver
specifically designed to drive two power N-Channel
MOSFETs in a synchronous-rectified buck converter
topology. This driver combined with Richtek’ s series of
Multi-Phase Buck PWM controller form a complete core-
www.DataSvheoeltta4gUe.coremgulator solution for advanced micro-processors.
The RT9618/A drives both the lower/upper gate in a
synchronous-rectifier bridge with 12V. This drive-voltage
flexibility provides the advantage of optimizing applications
involving trade-offs between switching losses and
conduction losses.
RT9618A has longer UGATE/LGATE deadtime which can
drive the MOSFETs with large gate RC value, avoiding the
shoot-through phenomenon. RT9618 is targeted to drive
low gate RC MOSFETs and performs better efficiency.
The output drivers in the RT9618/A can efficiently switch
power MOSFETs at frequency up to 500kHz. Switching
frequency above 500kHz has to take into account the
thermal dissipation of SOP-8 package. RT9618/A is
capable to drive a 3nF load with a 30ns rise time. RT9618/
A implements bootstrapping on the upper gate with an
external capacitor and an embedded diode. This reduces
implementation complexity and allows the use of higher
performance, cost effective N-Channel MOSFETs. Adaptive
shoot-through protection is integrated to prevent both
MOSFETs from conducting simultaneously.
Pin Configurations
(TOP VIEW)
BOOT
PWM
OD
VCC
2
3
4
8 UGATE
7 PHASE
6 PGND
5 LGATE
Features
z Drives Two N-Channel MOSFETs
z Adaptive Shoot-Through Protection
z Embedded Boot Strapped Diode
z Support High Switching Frequency
z Fast Output Rise Time
z Small SOP-8 Package
z Tri-State Input for Bridge Shutdown
z Supply Under Voltage Protection
z Upper MOSFET Direct Shorted Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Core Voltage Supplies for Desktop, Motherboard CPU
z High Frequency Low Profile DC-DC Converters
z High Current Low Voltage DC-DC Converters
Ordering Information
RT9618/A
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Long Dead Time
Short Dead Time
Note :
RichTek Pb-free and Green 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.
`100% matte tin (Sn) plating.
SOP-8
DS9618/A-04 March 2007
www.richtek.com
1
1 page  
RT9618/A
Parameter
PWM Input
Maximum Input Current
PWM Floating Voltage
PWM Rising Threshold
PWM Falling Threshold
Output Disable Input
www.DataSheOeDt4UR.cisoming Threshold
OD Hysteresis
Timing
UGATE Rise Time
UGATE Fall Time
LGATE Rise Time
LGATE Fall Time
Propagation Delay
Output
UGATE Drive Source
UGATE Drive Sink
LGATE Drive Source
LGATE Drive Sink
Symbol
IPWM
VPWMfl
VPWMrth
VPWMfth
VODrth
VODhys
trUGATE
tfUGATE
trLGATE
tfLGATE
RT9618
tpdhUGATE
RT9618A
tpdlUGATE
RT9618/A tpdhLGATE
tpdlLGATE
RUGATEsr
RUGATEsk
RLGATEsr
RLGATEsk
Test Conditions
PWM = 0V or 5V
VCC = 12V
VCC = 12V, 3nF load
VCC = 12V, 3nF load
VCC = 12V, 3nF load
VCC = 12V, 3nF load
VBOOT − VPHASE= 12V
See Timing Diagram
See Timing Diagram
VBOOT − VPHASE= 12V
VBOOT − VPHASE= 12V
VCC = 12V
VCC = 12V
Min Typ Max Units
-- 300 --
-- 2.4 --
3.2 3.6 3.9
1.1 1.3 1.5
μA
V
V
V
1.5 1.8 2.1
-- 0.5 --
V
V
-- 27 35 ns
-- 32 45 ns
-- 35 45 ns
-- 27 38 ns
-- 20 --
-- 90 --
-- 15 -- ns
-- 20 --
-- 8 --
-- 1.9 3
-- 1.4 3
-- 1.9 3
-- 1.1 2.2
Ω
Ω
Ω
Ω
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may
remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
DS9618/A-04 March 2007
www.richtek.com
5
5 Page 
L1
VIN
12V
1.2uH
C1
1000uF
VCORE
C3
1500uF
Q1
L2
2uH
Q2
D1
C2 1
1uF
CB
BOOT
1uF
8 UGATE
7 PHASE
PHB83N03LT
4
VCC
2
VIN
3
OD
PHB95N03LT 5 LGATE
PGND 6
R1
C4 10
1uF
PWM
5V
12V
Figure 6. Two-Phase Synchronous Buck Converter Circuit
www.DataSheet4U.com
When layout the PCB, it should be very careful. The power-
circuit section is the most critical one. If not configured
properly, it will generate a large amount of EMI. The junction
of Q1, Q2, L2 should be very close.
Next, the trace from UGATE, and LGATE should also be
short to decrease the noise of the driver output signals.
PHASE signals from the junction of the power MOSFET,
carrying the large gate drive current pulses, should be as
heavy as the gate drive trace. The bypass capacitor C4
should be connected to PGND directly. Furthermore, the
bootstrap capacitors (CB) should always be placed as close
to the pins of the IC as possible.
RT9618/A
DS9618/A-04 March 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9618A.PDF ] | |
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