IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 9

• 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

SYSTEM THEORY OF OPERATION
Description:
The system consists of one control IC and scalable number of phase IC’s depending upon the number of converter
phases. The control IC communicates with the phase ICs using three digital buses, i.e., CLOCK, PHSIN, PHSOUT and
three analog buses, i.e., VDAC, EA, IIN. The digital buses are responsible for switching frequency determination and
accurate phase timing control without any external component. The analog buses are used for PWM control and
current sharing among interleaved phases. The control IC incorporates all the system functions, i.e., VID, CLOCK
signals, error amplifier, fault protections, current monitor, etc. The Phase IC implements the functions required by each
phase of the converter, i.e., the gate drivers, PWM comparator and latch, over-voltage protection, Phase disable
circuit, current sensing and sharing, etc. In addition to these functions, the control IC also implements PSI# (Power
System Indicator) functionality to improve the efficiency of the voltage regulator at light loads.
Page 9 of 39
IVSETPT
NO. OF ACTIVE PHASES MONITOR
VDRP
AMP
CONTROL IC
CLOCK GENERATOR
+
-
REMOTE SENSE
AMPLIFIER
IROSC
+
-
ERROR
AMPLIFIER
Compensation
Thermal
VDAC
VDAC
+
-
VN
VSETPT
IMON
VDRP
IIN
PHSOUT
PHSIN
SHIFT
PSI
VO
VDAC
LGND
EAOUT
FB
CLKOUT
RVSETPT
RTHRM
RCOMP
CCOMP
RFB1
CFB1
RDRP1
CDRP
RFB
RDRP
GATE DRIVE
VOLTAGE
Figure 3: System Block Diagram
PHSOUT
PHSOUT
PHSIN
ISHARE
CLKIN
DACIN
ISHARE
DACIN
EAIN
CLKIN
EAIN
PHSIN
ILL
ILL
CLK
D
CLK
D
SHARE ADJUST
VID6
SHARE ADJUST
VID6
Q
Q
1
1
AMPLIFIER
AMPLIFIER
VID6
VID6
VID6
VID6
2
2
VID6
PWM COMPARATOR
VID6
VID6
VID6
PWM COMPARATOR
VID6
VID6
LATCH
LATCH
PHASE IC
VID6
PHASE IC
VID6
&
&
VID6 VID6
VID6
VID6
VID6
BRAKING
BODY
BRAKING
BODY
VID6
VID6
VID6
VID6
VID6
VID6
VID6
VID6
VID6
VID6
GENERATION
VID6
VID6
GENERATION
SHIFT
PULSE
+
SHIFT
PULSE
+
VID6
+
+
PSI# COMPARATOR
8 COUNT DELAY
VID6
PSI# COMPARATOR
8 COUNT DELAY
&
&
AMPLIFIER
AMPLIFIER
VID6
CURRENT
VID6
CURRENT
SENSE
VID6
SENSE
VID6
OFF
OFF
OFF
OFF
VID6
VID6
VID6
VID6
VID6
VID6
VID6
VID6
CSIN+
CSIN-
VCC
VCCH
GATEH
SW
VCCL
GATEL
PGND
PSI
SHIFT
VCCH
VCCL
GATEL
PSI
CSIN+
CSIN-
VCC
SW
PGND
SHIFT
GATEH
February 12, 2010
CCS
CCS
RCS
RCS
CBST
CBST
IR3503
COUT
PSI#
SHIFT
VIN
VOSNS+
VOUT
GND
VOSNS-