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IR3621 Datasheet(PDF) 1 Page - International Rectifier

Part No. IR3621
Description  2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IR3621 Datasheet(HTML) 1 Page - International Rectifier

 
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IR3621&(PbF)
1
www.irf.com
Data Sheet No.PD60231 revA
DESCRIPTION
The IR3621 IC combines a dual synchronous buck control-
ler and drivers, providing a cost-effective, high performance
and flexible solution. The IR3621 operates in 2-Phase mode
to produce either 2-independent output voltages or current
share single output for high current application. The 180
!
out-of-phase operation allows the reduction of input and
output capacitance.
Other key features include two independently programmable
soft-start functions to allow system level sequencing of out-
put voltages in various configurations. The pre-bias protec-
tion feature prevents the discharge of the output voltage and
possible damage to the load during start-up when a pre-
existing voltage is present at the output. Programmable
switching frequency up to 500KHz per phase allows flexibil-
ity to tune the operation of the IC to meet system level re-
quirements, and synchronization allows the simplification
of system level filter design. Protection features such as
selectable hiccup or latched current limit, and under voltage
lock-out are provided to give required system level security
in the event of a fault condition.
FEATURES
2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH
OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
Figure 1 - Typical application of IR3621 in current share single output and 2-independent output voltage configuration
APPLICATIONS
Embedded Networking & Telecom Systems
Distributed Point-of-Load Power Architectures
2-Phase Power Supply
Graphics Card
DDR Memory Applications
Dual Synchronous Controller with 180
!
Out of Phase Operation
Configurable to 2-Independent Outputs or
Current Share Single Output
Voltage Mode Control
Current Sharing Using Inductor's DCR
Selectable Hiccup or Latched Current
Limit using MOSFET's RDS(on) sensing
Latched Over-Voltage Protection
Pre-Bias Start Up
Programmable Switching Frequency up to 500KHz
Two Independent Soft-Starts/Shutdowns
Precision Reference Voltage 0.8V
Power Good Output
External Frequency Synchronization
Thermal Protection
Vin
Vout
PGnd1
LDrv1
HDrv1
LDrv2
HDrv2
Gnd
Comp2
Comp1
SS1 / SD
IR3621
Rt
SS2 / SD
PGnd2
OCSet2
OCSet1
Vin
Vin
Vout1
PGnd1
LDrv1
HDrv1
LDrv2
HDrv2
Gnd
Comp2
Comp1
SS1 / SD
IR3621
Rt
SS2 / SD
PGnd2
OCSet2
OCSet1
Vin
Vout2
Current share, single output configuration
2-independent output voltage configuration
PKG
DESIG
M
M
F
F
PART
LEADFREE
NUMBER
PART NUMBER
IR3621M
IR3621MPbF
IR3621MTR
IR3621MTRPbF
IR3621F
N/A
IR3621FTR
N/A
PARTS
PER TUBE
73
------
50
------
PARTS
PER REEL
------
6000
------
2500
ORDERING INFORMATION
PIN
COUNT
32
32
28
28
T & R
Orientation
Fig A


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