IR3531 datasheet(1/39 Pages) IRF

Part #	IR3531

Description	Sink and source tracking capability

PDF	39 Pages

Scroll/Zoom	100%

Manufacturer	IRF [International Rectifier]

Direct Link	http://www.irf.com

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1 / 39 page

4+1 Phase Dual Output Control IC

IR3531

March 22, 2012 | FINAL | V2.27

1

FEATURES

 Integrated 6.8V/0.8A Buck Regulator provides

bias to Control and Driver IC(s)

 Adjustable switching frequency from 250 KHz up

to 1.5MHz per phase based on the synchronization

SCLK input

 Sink and source tracking capability

 Margining via SVID for both rails

 Pre-bias compatible

 Soft Stop capability

 0.5% overall system set point accuracy

 Voltage Mode Modulation for excellent transient

performance

 Single NTC thermistor for current reporting, OC

Threshold, and Load Line thermal compensation

 Complete protection including over-current,

over-voltage, over-temperature, open remote

sense and open control loop

 Thermally enhanced 48L 7mm x 7mm MLPQ

package

 RoHS compliant

BASIC APPLICATION CIRCUIT

Figure 1: IR3531 Basic Application Circuit,

showing a 4+1 Configuration

DESCRIPTION

The IR3531 control IC provides all the necessary control,

communication and protection to support compact dual

output power solutions up to 210W. The IR3531 can be

combined with either discrete IR3535 driver ICs and Direct

Fets

TM or our IR35XX family of footprint compatible and

scalable PowIRstages

TM which integrate the MOSFETs and

driver into the same package.

The IR3531 provides overall system control and current

sharing while the Driver IC or power stages senses per-

phase current locally and communicates it to the Control

IC. The IR3531 has tri-state PWM outputs to allow diode

emulation during light load events.

The IR3531 provides a high performance transient solution

through classic voltage mode control and our non-linear

transient solutions, Turbo

TM and Body BrakingTM. TurboTM

automatically turns on all phases to minimize load turn-on

transients while Body Braking

TM automatically turns off the

low-side MOSFET to help dissipate stored inductor energy

at load turn-off.

PIN DIAGRAM

IR3531

48 Pin 7 x 7 MLPQ

Top View

49 GND

48

47

46

45

44

43

42

41

40

39

EN

VRHOT#

VRRDY1

VRRDY

VCC

SW

V12V

ALERT#

VCLK

VDIO

PHSSHED

IMON_R1

1

2

3

4

5

6

7

8

9

10

11

12

BBR1#

PWM4

PWM3

TSENS

ROSC/OVP

ADDR

ICCP

SCLK

PWM2

PWM1

BBR#

TRACK

36

35

34

33

32

31

30

29

28

27

26

25

38

37

13

14

15

16

17

18

19

20

21

22

23

24

Figure 2: IR3531 Package Top View

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