IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 25

• Manufacturer Part Number: IR3503MTRPBF
• Description: IC CTRL XPHASE VR11.0/1 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3503MTRPBF

• Applications: Processor
• Current - Supply: 8mA
• Voltage - Supply: 4.75 V ~ 7.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: *
• Package: 32-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
• Other names: IR3503MTRPBFTR

VID Fault Codes
VID codes of 0000000X and 1111111X for VR11 will set the fault latch and disable the error amplifier. A 1.3 µs
delay is provided to prevent a fault condition from occurring during Dynamic VID changes. A VID FAULT condition is
latched with boot voltage and can only be cleared by cycling power to VCCL or re-issuing ENABLE.
Voltage Regulator Ready (VRRDY)
The VRRDY pin is an open-collector output and should be pulled up to a voltage source through a resistor. After the
soft start completion cycle, the VRRDY remains high until the output voltage is in regulation and SS/DEL is above
3.92 V. The VRRDY pin becomes low if the fault latch, over voltage latch, open sense line latch, or open daisy chain
is set. A high level at the VRRDY pin indicates that the converter is in operation and has no fault. The VRRDY stays
high as long as the output voltage is within 300 mV of the programmed VID. During start-up, it is pulled low with an
input voltage as low as 2 V. It stays low until the startup sequence has completed, and the output voltage has
moved to the programmed VID.
Open Voltage Loop Detection
The output voltage range of error amplifier is detected all the time to ensure the voltage loop is in regulation. If any
fault condition forces the error amplifier output above VCCL-1.08 V for 8 switching cycles, the fault latch is set. The
fault latch can only be cleared by cycling power to VCCL.
Open Remote Sense Line Protection
If either remote sense line VOSEN+ or VOSEN- or both are open, the output of remote sense amplifier (VO) drops.
The IR3503 monitors VO pin voltage continuously. If VO voltage is lower than 200 mV, two separate pulse currents
are applied to VOSEN+ and VOSEN- pins respectively to check if the sense lines are open. If VOSEN+ is open, a
voltage higher than 90 % of V(VCCL) will be present at VOSEN+ pin and the output of open line detect comparator
will be high. If VOSEN- is open, a voltage higher than 700 mV will be present at VOSEN- pin and the output of
open-line-detect comparator will be high. The open sense line fault latch is set, which pulls error amplifier output low
immediately and shut down the converter. The SS/DEL voltage is discharged and the fault latch can only be reset
by cycling VCCL power. During dynamic VID down, OVP may be triggered when output voltage can not follow
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OV
THRESHOLD
OUTPUT
VOLTAGE
(VO)
VID
(FAST
VDAC)
VDAC
NORMAL
OPERATION
Figure 16: Over voltage protection during dynamic VID transition
VDAC
VID DOWN
50mV
LOW VID
50mV
VID UP
NORMAL
OPERATION
February 12, 2010
1.73V
VDAC + 130mV
IR3503