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International Rectifier Electronic Components Datasheet

IR3081A Datasheet

XPHASETM VR 10 CONTROL IC

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IR3081A
DATA SHEET
XPHASETM VR 10 CONTROL IC
DESCRIPTION
The IR3081A Control IC combined with an IR XPhaseTM Phase IC provides a full featured and flexible way
to implement a complete VR 10 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 XPhaseTM architecture results in a power supply that is smaller, less expensive, and easier
to design while providing higher efficiency than conventional approaches. The IR3081A is intended for
www.DataSheet4U.com VRD 10 or VRM/EVRD 10 applications that use external VCCVID/VTT circuits.
The IR3081A is functionally equivalent to the IR3081, but incorporates the following modifications:
Under Voltage Lockout start threshold increased from 9.1V to 9.7V (typical) and hysteresis increased
from 200mV to 800mV (typical).
Hysteresis (52mV typical) added to the SS/DEL comparator to prevent Power Good output chatter.
Over current discharge current increased from 6uA to 40uA (typical) to reduce the over current delay
time.
IIN pin precondition circuit added to disable current sharing in the phase ICs during soft start.
FEATURES
6 bit VR 10 compatible VID with 0.5% overall system accuracy
1 to X phases operation with matching phase ICs
Programmable Dynamic VID Slew Rate
No Discharge of output capacitors during Dynamic VID step-down (can be disabled)
+/-300mV Differential Remote Sense
Programmable 150kHz to 1MHz oscillator
Programmable VID Offset and Load Line output impedance
Programmable Softstart
Programmable Hiccup Over-Current Protection with Delay to prevent false triggering
Simplified Powergood provides indication of proper operation and avoids false triggering
Operates from 12V input with 9.1V Under-Voltage Lockout
6.8V/5mA Bias Regulator provides System Reference Voltage
Enable Input
Small thermally enhanced 28L MLPQ package
Page 1 of 39
1/31/05


International Rectifier Electronic Components Datasheet

IR3081A Datasheet

XPHASETM VR 10 CONTROL IC

No Preview Available !

APPLICATION CIRCUIT
12V
POWERGOOD
ENABLE
www.DataSheet4U.com
VID5
VID0
VID1
VID2
VID3
VID4
RVCC
10 ohm
CVCC
0.1uF
1 OSCDS
2 VID5
3 VID0
4 VID1
5 VID2
6 VID3
7 VID4
IR3081A
CONTROL
IC
VBIAS
BBFB
EAOUT
FB
VDRP
IIN
OCSET
21
20
19
18
17
16
15
0.1uF
RCP
CCP
RDRP1 CDRP
RDRP
CCP1
ROSC
ROCSET
RVDAC
CVDAC
CFB
RFB1 RFB
IR3081A
RMPOUT
VBIAS
EA
5 Wire Analog Bus
to Phase ICs
ISHARE
VDAC
VOSENSE+
VOSENSE-
Remote Sense
ORDERING INFORMATION
Device
IR3081AMTR
IR3081AM
Order Quantity
3000 per reel
100 piece strips
Page 2 of 39
1/31/05


Part Number IR3081A
Description XPHASETM VR 10 CONTROL IC
Maker International Rectifier
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IR3081A Datasheet PDF






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