IR3080M International Rectifier, IR3080M Datasheet - Page 12

• Manufacturer Part Number: IR3080M
• Description: IC PHASE CONTROLLER 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3080M

• Applications: Processor
• Current - Supply: 11mA
• Voltage - Supply: 9.5 V ~ 14 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-MLPQ
• Package: 32-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 150kHz to 1.0MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IR3080M

IR3080 THEORY OF OPERATION
Block Diagram
The Block diagram of the IR3080 is shown in Figure 6, and specific features are discussed in the following sections.
VID Control
A 6-bit VID voltage compatible with VR 10, as shown in Table 1, is available at the VDAC pin. A detailed block
diagram of the VID control circuitry can be found in Figure 7. The VID pins are internally pulled up to VIDPWR pin
through 700Ω resistors. The VID input comparators, with 0.6V reference, monitor the VID pins and control the 6 bit
Digital-to-Analog Converter (DAC) whose output is sent to the VDAC buffer amplifier. The output of the buffer
amplifier is the VDAC pin. The VDAC voltage is post-package trimmed to compensate for the input offsets of the
Error Amplifier to provide a 0.5% system set-point accuracy. The actual VDAC voltage does not determine the
system accuracy and has a wider tolerance.
VIDDEL
SS/DEL
VIDPWR
VOSNS-
RMPOUT
VBIAS
ROSC
VCC
VID5
VID0
VID1
VID2
VID3
VID4
BBFB
Page 12 of 41
ICHG
70uA
9.1V
8.9V
IDISCHG
+
-
OFF
6uA
50%
DUTY
CYCLE
IVTTDEL
IROSC
IROSC
IROSC
IROSC
IROSC
IROSC
VCC
COMPARATOR
VID
CONTROL
-
START
STOP
+
66uA
IROSC
IROSC
IROSC
IROSC
RAMP GENERATOR
UVLO
ON
VID = 11111X
VID STEP-DOWN
VID DAC OUTPUT
VID DELAY
COMPARATOR
+
-
4V
90mV
SS/DEL
DISCHARGE
5.0V
1.0V
Figure 6. IR3080 Block Diagram
VBIAS
IROSC
+
-
DELAY
COMPARATOR
CURRENT
SOURCE
GENERATOR
1.2V
0.2V
-
+
+
-
-
+
DISCHARGE
COMPARATOR
ROSC
BUFFER
AMP
1.1V
OVER
CURRENT
VBIAS
REGULATOR
+
-
+
-
VCCVID
COMPARATOR
VCCVID
REGULATOR
+
-
-
+
+
-
1.3V
6.85V
+
-
IROSC
OVER-CURRENT
COMPARATOR
SOFTSTART
CLAMP
VOLTAGE
PROPORTIONAL
TO ABSOLUTE
TEMPERATURE
FAULT
LATCH
S
R
IOCSET
+
-
+
-
IROSC
DISABLE
IFB
+
+
-
VRHOT
COMPARATOR
ERROR
AMP
START
STOP
-
+
-
+
VDRP
AMP
9
/30/04
IR3080
PWRGD
VIDPGD
VDRP
IIN
OCSET
EAOUT
FB
VCCVID
VIDFB
VDAC
LGND
VRHOT
HOTSET