IR3523MTRPBF International Rectifier, IR3523MTRPBF Datasheet - Page 22

• Manufacturer Part Number: IR3523MTRPBF
• Description: IC XPHASE3 CTLR VR11.1 40-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3523MTRPBF

• Applications: Processor
• Current - Supply: 10mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 40-MLPQ
• Ic Function: Dual Output Control IC
• Supply Voltage Range: 4.75V To 7.5V
• Operating Temperature Range: 0°C To +150°C
• Digital Ic Case Style: MLPQ
• No. Of Pins: 40
• Controller Type: XPhase
• Rohs Compliant: Yes
• Package: 40-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

Open Remote Sense Line Protection
If either remote sense line VOSEN
The IR3523 continuously monitors the VOUT
are applied to the VOSEN
higher than 90% of V(VCCL) will be present at VOSEN
be high. If VOSEN
Detect Comparator output will be high. With either sense line open, the Open Sense Line Fault Latch will be set to
force the error amplifier output low and immediately shut down the converter. SS/DEL
Open Sense Fault Latch can only be reset by cycling the power to VCCL.
Open Daisy Chain Protection
IR3523 checks the daisy chain every time it powers up. It starts a daisy chain pulse on the PHSOUT pin and
detects the feedback at PHSIN pin. If no pulse comes back after 32 CLKOUT pulses, the pulse is restarted again. If
the pulse fails to come back the second time, the open daisy chain fault is registered, and SS/DEL is not allowed to
charge. The fault latch can only be reset by cycling the power to VCCL.
After powering up, the IR3523 monitors PHSIN pin for a phase input pulse equal or less than the number of phases
detected. If PHSIN pulse does not return within the number of phases in the converter, another pulse is started on
PHSOUT pin. If the second started PHSOUT pulse does not return on PHSIN, an open daisy chain fault is
registered.
Phase Number Determination
After a daisy chain pulse is started, the IR3523 checks the timing of the input pulse at PHSIN pin to determine the
phase number.
Page 22 of 37
OV
THRESHOLD
OUTPUT
VOLTAGE
(VO)
VID
VDAC
X
- is open, a voltage higher than 400mV will be present at VOSEN
NORMAL
OPERATION
X
+ and VOSEN
Figure 15 - Over-voltage protection during dynamic VID
VDAC
X
VID DOWN
+ or VOSEN
X
- pins to check if the sense lines are open. If VOSEN
50mV
X
pin and if VOUT
X
LOW VID
- is open, the output of Remote Sense Amplifier (VOUT
50mV
X
+ pin and the output of Open Line Detect Comparator will
X
VID UP
is lower than 200 mV, two separate pulse currents
NORMAL
OPERATION
X
will be discharged and the
1.73V
X
- pin and the Open Line
VDAC + 130mV
June 20, 2008
X
+ is open, a voltage
IR3523
X
) drops.