IR3084UMTRPBF International Rectifier, IR3084UMTRPBF Datasheet - Page 14

• Manufacturer Part Number: IR3084UMTRPBF
• Description: IC CTLR XPHASE 28-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase™r

Specifications of IR3084UMTRPBF

• Package / Case: 28-MLPQ
• Mounting Type: Surface Mount
• Current - Supply: 14mA
• Voltage - Supply: 9.5 V ~ 16 V
• Operating Temperature: 0°C ~ 100°C
• Applications: Processor
• Package: 28-Lead MLPQ
• Circuit: X-Phase Control IC
• Switch Freq (khz): 150kHz to 1.0MHz
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ENABLE
RMPOUT
VOSNS-
VBIAS
VIDSEL
IR3084U THEORY OF OPERATION
Block Diagram
VID Control
A 7-bit VID voltage compatible with VR10 (see Table 1) and VR11 (see Table 2) and Opteron/Athlon64 (see
Table 3) is available at the VDAC pin. The VIDSEL pin configures the DAC for VR10 if grounded, VR11 if
floating, and Opteron/Athlon64 if connected to GND via a 6.4K resistor. The VIDSEL pin is internally pulled-up to
2.4V through a 4.5Kohm resistor. The VID pins require an external bias voltage and should not be floated. The
VID input comparators, with 0.6V reference for VR10/VR11 and 1.24V for Opteron/Athlon64, monitor the VID
pins and control the 7-bit Digital-to-Analog Converter (DAC) whose output is sent to the VDAC buffer amplifier.
The output of the buffer amp is the VDAC pin. The VDAC voltage is post-package trimmed to compensate for
the input offsets of the Error Amp to provide a 0.5% system accuracy. The actual VDAC voltage does not
represent the system set point and has a wider tolerance.
SS/DEL
ROSC
INTEL
850mV
750mV
LGND
VCC
VID6
VID5
VID4
VID3
VID2
VID1
VID0
AMD
1.23V
1.17V
4.5K
2.4V
9.9V
9.1V
Page 14 of 47
+
-
+
-
100k
+
-
VID INPUT
COMPARATORS
(1 OF 9
SHOWN)
50%
DUTY
CYCLE
IHICCUP
DISCHARGE
6.5uA
INTEL: 0.6V
AMD: 1.24V
INTEL/AMD
VCC
COMPARATOR
-
+
2.0V
+
-
250ns
BLANKING
RAMP GENERATOR
+
-
UVLO
ICHG
70uA
VCHG
3.85V
VOSNS FLOAT
DETECT
-
+
ON
ENABLE
COMPARATOR
-
+
IROSC
IROSC
IROSC
IROSC
IROSC
IROSC
IROSC
IROSC
IROSC
DIGITAL TO
ANALOG
CONVERTER
"FAST"
VDAC
OFF
100mV
+
-
80mV
4.8V
0.9V
1.1V
OC
DISCHARGE
CURRENT
40uA
VBIAS
IROSC
IROSC
+
-
-
+
Figure 7 – IR3084U Block Diagram
0.215V
1.3us
BLANKING
DELAY
COMPARATOR
0.6V
VID = 1.1V BOOT
CURRENT
SOURCE
GENERATOR
ON
SS/DEL
DISCHARGE
DISCHARGE
COMPARATOR
+
-
-
+
+
-
6.9V
1.95V
-
+
-
+
VBIAS
REGULATOR
1.2V
NO_CPU
ROSC
BUFFER
AMP
+
-
INTL_MD
VCC
UVLO
VOSNS OPEN
DISABLE
OVER CURRENT
IROSC
+
-
3.1V
NO CPU
VID SAMPLE
DELAY COMPARATOR
IREGSET
ISOURCE
ISINK
VDAC
BUFFER
AMP
NO CPU LATCHED
-
+
SOFTSTART
CLAMP
+
-
S
R
COMPARATOR
1.3V
OC
VID
FAULT
LATCH
IOCSET
+
-
IROSC
FAULT
LATCH
S
R
0.6V
0.35V
IROSC
S
R
+
-
-
+
DISABLE
INTEL: IOFFSET
AMD: -IOFFSET
START
LATCH
-
+
+
-
+
+
-
IR3084U
BIAS
REGULATOR
ERROR AMP
ERROR
AMP
VDRP
AMP
S
R
9/14/2005
IIN
PRECONDITIONING
LATCH
INTL_MD
REGDRV
VSETPT
REGSET
OCSET
REGFB
VRRDY
EAOUT
VDRP
12.5K
VDAC
FB
IIN