IR3503MTRPBF International Rectifier, IR3503MTRPBF Datasheet - Page 31

• 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

Thermistor R
The threshold voltage of VRHOT comparator is fixed at 1.6V, and a negative temperature coefficient (NTC)
thermistor R
thermistor resistance at allowed maximum temperature T
Select the series resistor R
operational temperature range. Then calculate R
from (28).
VCCL Capacitor C
driven. The linear regulator supplies the bias and gate drive current of the phase ICs. A 4.7uF normally ensures a
stable VCCL performance for Intel VR11.1 applications.
Current Monitor Filter
A filter is added to isolate the CPU from rapid changes in the load current and trigger false response. A filter with
300 µs time constant provides adequate delay for Intel VR11.1 response. A 1k resistor between IMON and local
ground helps equalize the source and sink current of the IMON pin.
The capacitor is selected based on the stability requirement of the linear regulator and the load current to be
Page 31 of 39
THERM
THERM
is required to sense the temperature of the power stage. If we pre-select R
VCCL
and Over Temperature Setting Resistors R
HOTSET2
R
TMAX
to linearize the NTC thermistor, which has non-linear characteristics in the
=
R
HOTSET
R
THERM
1
=
HOTSET1
*
(
R
EXP
TMAX
corresponding to the allowed maximum temperature T
[
MAX
+
B
R
THERM
HOTSET
is calculated from (27).
1
HOTSET1
( *
6 .
2
)
( *
T
L
VCCL
_
1
MAX
and R
−
−
. 1
HOTSET2
T
) 6
_
ROOM
1
February 12, 2010
)]
IR3503
THERM
, the NTC
(27)
(28)
MAX