IR3084 Datasheet, PDF (1/45 Pages) International Rectifier – XPHASETM VR 10/11 CONTROL IC

IR3084
Data Sheet No. PD94718
XPHASE^TM VR 10/11 CONTROL IC
DESCRIPTION
The IR3084 Control IC combined with an IR XPhase^TM Phase IC provides a full featured and flexible
way to implement a complete VR10 or VR11 power solution. The “Control” IC provides overall system
control and interfaces with any number of “Phase” ICs which each drive and monitor a single phase of a
multiphase converter. The XPhase^TM architecture results in a power supply that is smaller, less
expensive, and easier to design while providing higher efficiency than conventional approaches.
FEATURES
• 1 to X phase operation with matching Phase IC
• Supports both VR11 8-bit VID code and extended VR10 7-bit VID code
• 0.5% Overall System Setpoint Accuracy
• VID Select pin sets the DAC to either VR10 or VR11
• VID Select pin selects either VR11 or legacy VR10 type startups
• Programmable VID offset and Load Line output impedance
• Programmable VID offset function at the Error Amp’s non-inverting input allowing zero offset
• Programmable Dynamic VID Slew Rate
• ±300mV Differential Remote Sense
• Programmable 150kHz to 1MHz oscillator
• Enable Input with 0.85V threshold and 100mV of hysteresis
• VR Ready output provides indication of proper operation and avoids false triggering
• Phase IC Gate Driver Bias Regulator / VRHOT Comparator
• Operates from 12V input with 9.9V Under-Voltage Lockout
• 6.9V/6mA Bias Regulator provides System Reference Voltage
• Programmable Hiccup Over-Current Protection with Delay to prevent false triggering
• Small thermally enhanced 5mm x 5mm, 28 pin MLPQ package
TYPICAL APPLICATION CIRCUIT
VCC_SENSE
VSS_SENSE
RT2
R117
4.7K, B=4450 1.21K
RFB1
162
CFB
10nF
C1009
100pF
RFB
324
CCP1
100pF
RCP
2.49K
CCP
56nF
+5.0V
R137
2K
18
17
FB
EAOUT VRRDY ²⁷
IIN ¹⁵
RMPOUT ¹⁹
RDRP
787
VBIAS ²⁰
IR3084MTR
C134
0.1uF
EA
VREG_12V_FILTERED
VR_RDY
ISHARE
RMP
VBIAS
C89
100pF
R1331 Q4
1
CJD200
C204
0.1uF
OUTEN
VID0
VID1
VID2
VID3
VID4
VID5
VID6
VID7
VID_SEL
VREG_12V_FILTERED
R30
10
C130
0.1uF
16
28
9
8
7
6
5
4
3
2
1
21
26
CSS/DEL
0.1uF
VDRP
ENABLE
VID0
VID1
VID2
VID3
VID4
VID5
VID6
VID7
VIDSEL
VCC
SS/DEL
REGDRV
REGFB
REGSET
VSETPT
OCSET
VDAC
ROSC
VOSNS-- LGND
24
23
25
RVSETPT
124
14
ROCSET
13
15.8K
12
ROSC 30.1K
11
22
10
RVGDRV
97.6K
CVGDRV
10nF
RVDAC
3.5
VDAC
CVDAC
33nF
VGDRIVE
C135
1uF
Page 1 of 45
07/20/2005