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IR3622MPBF

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

International Rectifier 

IR3622MPbF

Pin#

Pin Name

Description

1

2

3

4

5

6

7, 17

8,16

9

10, 14

11, 13

12

15

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

Rt

VSEN2

Fb2

Comp2

SS2/SD2/Mode

OCSet2

VcH2, VcH1

HDrv2, HDrv1

Enable

PGnd2, PGnd1

LDrv2 , LDrv1

VcL

Seq

OCSet1

SS1/SD1

Comp1

Fb1

VSEN1

Sync

PGood2

VP1

VP2

VREF

Gnd

PGood1

Vcc

Vout3

Track

Connecting a resistor from this pin to ground sets the switching frequency

(see figure 16 on page 17 for selecting resistor value)

Sense pin for OVP2 and Power Good2, Channel 2

Inverting input to the error amplifier2

Compensation pin for the error amplifier2

Soft start for channel 2, can be used as SD pin. Float this pin for current

share single output application

Current limit set point for channel2

Supply voltage for the high side output drivers. These are connected to

voltage that must be typically 6V higher than their bus voltages. A 0.1uF

high frequency capacitor must be connected from these pins to PGND to

provide peak drive current capability

Output drivers for the high side power MOSFETs

Enable pin, recycling this pin will reset OV, SS and Prebias latch

These pins serve as the separate grounds for MOSFET drivers and should

be connected to the system’s ground plane

Output drivers for the synchronous power MOSFETs

Supply voltage for the low side output drivers

Enable pin for tracking and sequencing. If this pin is not used

connect it to Vout3

Current limit set point for Channel 1

Soft start for Channel 1, can be used as SD pin

Compensation pin for the error amplifier1

Inverting input to the error amplifier1

Sense pin for OVP1 and Power Good1, Channel 1

External synchronization pin

Power Good pin output for channel 2, open collector. This pin needs to be

externally pulled high

Non inverting input of error amplifier1

Non inverting input of error amplifier2

Reference Voltage

IC’s Ground

Power Good pin output for Channel 1, open collector. This pin needs to be

externally pulled high

Supply voltage for the internal blocks of the IC. A 0.1uF high frequency

capacitor must be connected from this pin to Gnd.

Output of the internal regulator. A 0.1uF high frequency capacitor must be

connected from this pin to PGnd.

Sets the type of power up / down sequencing (ratiometric or

simultaneous). If this pin is not used connect it to Vout3

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