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IR3622MPBF

HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING

International Rectifier 

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 180o

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 180o

• Programmable Over Current Protection

out of phase operation which reduces the

•

•

Hiccup Current Limit Using MOSFET Rds(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

PIN

PARTS

COUNT PER BAG

32

100

PARTS

PER REEL

-------

M

IR3622MTRPbF

32

--------

3000

T&R

ORIANTAION

Fig A

03/15/07

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