IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 11

• 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

During power up, the control IC sends out clock signals from both CLKOUT and PHSOUT pins and detects the
feedback at PHSIN pin to determine the phase number and monitor any fault in the daisy chain loop. Figure 5 shows
the phase timing for a four phase converter. The switching frequency is set by the resistor ROSC. The clock frequency
equals the number of phase times the switching frequency.
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Control IC CLKOUT
(Phase IC CLKIN)
Control IC PHSOUT
(Phase IC1 PHSIN)
Phase IC1
PWM Latch SET
Phase IC 1 PHSOUT
(Phase IC2 PHSIN)
Phase IC 2 PHSOUT
(Phase IC3 PHSIN)
Phase IC 3 PHSOUT
(Phase IC4 PHSIN)
Phase IC4 PHSOUT
(Control IC PHSIN)
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
5
10
Figure 6: PHSOUT Frequency vs RROSC chart
Figure 5: Four Phase Oscillator Waveforms
15
PHSOUT FREQUENCY vs. RROSC
20
25
RROSC (KOhm)
30
35
40
45
February 12, 2010
50
IR3503
55