IR3622MPBF Datasheet, PDF (1/31 Pages) International Rectifier – HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING

Data Sheet No.PD94722 revA
IR3622MPbF
HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP
DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
Features
Description
• Dual Synchronous Controller with 180^o
Out of Phase Operation
• Configurable to 2-Independent Outputs or Current
Shared Single Output
• Output Voltage Tracking
• Power up / down Sequencing
The IR3622 IC integrates a dual synchronous
Buck controller, providing a high performance and
flexible solution. The IR3622 can be configured
as 2-independent outputs or as current shared
single output. The current share configuration is
ideal for high current applications.
• Current Sharing Using Inductor’s DCR
The IR3622 enables output tracking and
• +/-1% Accurate Reference Voltage
sequencing of multiple rails in either ratiometric or
• Programmable Switching Frequency up 600kHz
simultaneous fashion. The IR3622 features 180^o
• Programmable Over Current Protection
out of phase operation which reduces the
•
•
Hiccup Current Limit Using MOSFET R_ds(on) sensing
Latched Overvoltage Protection
required input/output capacitance and
lower number of capacitors. The
results in
switching
• Dual Programmable Soft-Starts
• Programmable Enable Input
• Pre-Bias Start-up
• Dual Power Good Outputs
• On Board Regulator
frequency is programmable from 200kHz to
600kHz per phase using one external resistor. In
addition, IR3622 also allows the switching
frequency to be synchronized to an external clock
signal.
• External Frequency Synchronization
Other key features offered by this device include
• Thermal Protection
two independent programmable soft starts, two
• 32-Lead MLPQ Package
independent power good outputs, precision
enable input, and under voltage lockout function.
Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Computing Peripheral Voltage Regulators
• Graphics Cards
• General DC/DC Converters
The current limit is provided by sensing the lower
MOSFET's on-resistance for optimum cost and
performance. The output voltages are monitored
through dedicated pins to protect against open
circuit, and enhance faster response to an
overvoltage event.
Vin
Vo1
Vo1
Vout1
IR3622
Rt
HDrv1
Comp1
OCSet1
LDrv1
Comp2
PGnd1
SS1 / SD
Vin
SS2 / SD
Seq
Track
HDrv2
OCSet2
LDrv2
Gnd
PGnd2
Vo2
Vo2
Vout1
Ratiometric Powerup
Ratiometric Powerdown
Vout2
Vo1
Vo1
Vo2
Vo2
Simultaneous Powerup Simultaneous Powerdown
www.irf.com
ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
M
IR3622MPbF
M
IR3622MTRPbF
PIN
COUNT
32
32
PARTS
PER TUBE
73
--------
PARTS
PER REEL
-------
3000
T&R
ORIANTAION
Fig A
03/15/07