IR3521MTRPBF International Rectifier, IR3521MTRPBF Datasheet - Page 37

• Manufacturer Part Number: IR3521MTRPBF
• Description: IC CTRL XPHASE3 SVID 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3521MTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 250kHz to 1.5MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DESIGN EXAMPLE – AMD FIVE + ONE PHASE DUAL OUTPUT CONVERTER (FIGURE 17)
SPECIFICATIONS
Input Voltage: V
DAC Voltage: V
No Load Output Voltage Offset for output1: V
Output1 Current: I
Output2 Current: I
Output1 Over Current Limit: I
Output2 Over Current Limit: I
Output Impedance: R
Dynamic VID Slew Rate: SR=3.25mV/uS
Over Temperature Threshold: T
POWER STAGE
Phase Number: n1=5, n2=1
Switching Frequency: f
Output Inductors: L1=120 nH, L2=220 nH, R
Output Capacitors: POSCAPs, C=470uF, R
IR3500 EXTERNAL COMPONENTS
Oscillator Resistor R
Once the switching frequency is chosen, R
520kHz per phase, choose R
Soft Start Capacitor C
Determine the soft start capacitor from the required soft start time.
The soft start delay time is
The PGOOD delay time is
The maximum over current fault latch delay time is
TD
TD
C
t
OCDEL
SS
1
3
/
DEL



C
C

SS
C
SS
TD
/
I
SS
/
DEL
DEL
CHG
/
I
Vboot
DEL
DISCHG
2
DAC
I
1 *
=12 V
( *
*
O1
O1
*
I
1 .
. 3
=1.2 V
CHG
. 0
=95 ADC
=20 ADC
I
92
O1
CHG

12
ROSC
SW
SS/DEL
=0.3 mΩ
0


1 .

=520 kHz
V
2
50
*
boot
0
*
limit1
limit2
OSC
10
1 .
*
10
10

*
47
MAX


6
=23.2kΩ.
10
=115 ADC
= 25 ADC
1
3

1 *
1
) 1 .
*
6
*
=110 ºC

0 .
10
6
50
1 .

*

*

. 0
6
0
10
12
2
1 .
2 .
C

*
L1
ROSC
= 8mΩ, Number Cn1=9, Cn2=5
O_NLOFST
6
mS

10
= 0.52mΩ, R

. 0

0
6
50
638
1 .
can be determined from Figure 2. For switching frequency of
( *
uF
*
Page 37
. 3
mS
10
=15 mV
92

6

L2
1
= 0.47mΩ

1
) 1 .

3
6 .
mS
IR3521
V3.03