IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 32

• Manufacturer Part Number: IR3503MTRPBF
• Description: IC CTRL XPHASE VR11.0/1 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3503MTRPBF

• Applications: Processor
• Current - Supply: 8mA
• 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
• Other names: IR3503MTRPBFTR

DESIGN EXAMPLE
SPECIFICATIONS
Input Voltage: V
DAC Voltage: V
No Load Output Voltage Offset: V
Continuous Output Current: I
Current for Gain Setting for IMON: I
Current Report Gain = 0.95 V represents I
Output Impedance: R
Soft Start Delay Time: TD1 = 0-5 ms
Soft Start Time: TD2 = 0.05 ms - 10 ms
VID Sample Delay Time: TD3 = 0.05-3 ms
VID Rise Time: TD4 = 0 - 3.5 ms
VR Ready Delay Time: TD5 = 0.05 - 3 ms
Maximum Over Current Delay Time: t
Dynamic VID Up-Slope Slew Rate: SR
Over Temperature Threshold: T
POWER STAGE
Phase Number: n = 5
Switching Frequency: f
Output Inductors: L = 150 nH, R
Output Capacitors: Ceramic: C = 22µF, Number N
IR3503 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
Once the switching frequency is chosen, R
For a switching frequency of 400 kHz per phase, choose R
µA. This will also be the bias current for the VSETPT pin.
Soft Start Capacitor C
Determine the soft start capacitor to meet the specifications of the delay time.
Choose C
The soft start time is
The VID sample delay time is
TD
TD
TD
3
1
2
=
=
=
C
C
C
SS
Page 32 of 39
SS
SS
SS/DEL
/
DEL
/
I
I
DEL
/
CHG
DEL
CHG
*
I
DAC
1 *
3 (
IN
CHG
= 0.1µF. The soft start delay time is
1 *
2 .
=12 V
4 .
SP
1 .
−
= 1.2 V
1
O
=
4 .
=
SW
= 0.8 m
SS/DEL
0
−
. 0
1 .
52
1
= 400 kHz
52
* 1
) 1 .
*
: C = 470 µF, Number N
5 .
OTDC
10
5 .
10
=
*
*
−
MAX
L
10
. 0
−
6
10
6
= 0.29 m
52
O_NLOFST
* 1
1 *
= 110 A
−
1 *
−
O, PEAK
5 .
6
10
= 100 ºC
6
4 .
OCDEL
1 .
*
up
−
10
6
=
=
*
= 10 mV/µs
−
. 2
O, PEAK
0
6
2
=180 A
7 .
OSC
1 .
= 10 mV
67
< 2.5 ms
mS
=
mS
. 1
can be determined from the curve in Figure 6 of this data sheet.
33
C
mS
= 50
SP
= 4
OSC
= 30.1 k . The reference current is given by 19.9
February 12, 2010
IR3503