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IR3531A Datasheet(PDF) 1 Page - International Rectifier

Part # IR3531A
Description  Sink and source tracking capability
Download  39 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3531A Datasheet(HTML) 1 Page - International Rectifier

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4+1 Phase Dual Output Control IC
IR3531A
March 22, 2012 | FINAL | V1.11
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: IR3531A Basic Application Circuit,
showing a 4+1 Configuration
DESCRIPTION
The IR3531A control IC provides all the necessary control,
communication and protection to support compact dual
output power solutions up to 210W. The IR3531A 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 IR3531A 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 IR3531A has tri-state PWM outputs to allow diode
emulation during light load events.
The IR3531A provides a high performance transient
solution through classic voltage mode control and Body
Braking
TM. Body BrakingTM automatically turns off the low-
side MOSFET to help dissipate stored inductor energy at
load turn-off.
PIN DIAGRAM
IR3531A
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: IR3531A Package Top View
A


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