IR3552

40A Integrated PowIRstage

®

www.irf.com | © 2014 International Rectifier

February 19, 2014 | FINAL

4

PIN DESCRIPTIONS

PIN #

PIN NAME

PIN DESCRIPTION

1

VCC

Connect this pin to a +5V bias supply. Place a 0.1uF high quality low ESR ceramic

capacitor from this pin to the LGND pin.

2

VDRV

Connect this pin to a separate supply voltage between 5V and 12V to vary the drive

voltage on both control and synchronous MOSFETs. Place a 1uF high quality low ESR

ceramic capacitor from this pin to GND. Note that on the control MOSFET, the gate drive

voltage is VDRV less the bootstrap diode voltage drop.

3

BOOST

Floating bootstrap supply pin for the upper gate drive. Connect the bootstrap capacitor

between this pin and the SW pin. The bootstrap capacitor provides the charge to turn on

the control MOSFET. Connect a 0.22uF capacitor from BOOST to SW pin.

4, 12, 13, 24

PGND

High current power ground. Note all pads are internally connected in the package. Provide

low resistance connections to the ground plane and respective output capacitors.

5, 25

GATEL

Gate connection of the synchronous MOSFET.

6-11

SW

High current switch node output.

14-16

VIN

High current input supply pads. Provide low resistance connections to the supply rail.

Ensure proper bypass capacitor values and layouts to the PGND pads.

17

VIN_DIV

Output containing divided VIN analog information, (VIN-LGND)/14 with respect to LGND.

The internal resistor divider is disconnected from VIN when EN is low. An active pull-down

is provided for phase fault communication.

18

TFAULT

Over temperature fault output. TFAULT will pull to 3.3V when the driver exceeds 150ºC

and will remain high until 130ºC. It

has a 25kΩ pull-down resistor to ground.

19

NC

No Connect.

20

EN

Enable input. Grounding EN places the device in low quiescent mode.

It has a 500kΩ pull-

down resistor to ground.

21

LGND

Bias and reference ground. All control signals are referenced to this pin.

22

PWM

The PWM signal is the control input for the first driver from either an IR ATL compatible

source or an industry standard Tristate PWM source. Connect this pin to the PWM output

of the controller.

23

MODE

The MODE pin is used to select between IR ATL mode PWM or standard tristate PWM

inputs. It should be tied to LGND or VCC and is sensed at EN enable rising edge or when

VCC UVLO is cleared. High = IR ATL mode, and Low = Standard tristate 3.3V and 5V TTL

level PWM mode.