IR3504MPBF International Rectifier, IR3504MPBF Datasheet - Page 30

• Manufacturer Part Number: IR3504MPBF
• Description: IC CTRL XPHASE AMD SVID 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3504MPBF

• 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: *
• 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

No Load Offset Setting Resistor RFB11, RFB13, RTHERM1 and Adaptive Voltage Positioning Resistor
RDRP11 for Output1
Define R
offset voltage V
using the equation in the ELECTRICAL CHARACTERISTICS Table, the effective offset resistor value, R
be determined from (12).
Adaptive voltage positioning lowers the converter voltage by R
the converter. Pre-select feedback resistor R
Calculate the desired effective feedback resistor at the maximum temperature R
A negative temperature constant (NTC) thermistor R
stage for the inductor DCR thermal compensation. Pre-select the value of R
R
as the NTC thermistor resistance at maximum allowed temperature, T
Select the series resistor R
which has non-linear characteristics in the operational temperature range.
Use equation (17) to determine R
R
FB_R
FB
13
=
at room temperature but also bigger than R
Page 30
(
FB_R
R
THERM
as the effective offset resistor at room temperature equals to R
1
O_NLOFST
+
R
TMAX
1
)
2
R
−
R
(offset above the DAC voltage) and calculating the sink current from the FB1 pin I
TMAX
R
4
DRP
R
FB
( *
FB13
FB
R
1
_
R
FB
11
1
11
R
THERM
=
_
=
=
=
by using equation (16). R
FB11.
M
R
V
THERM
R
R
1
=
O
*
FB
FB
_
1
R
R
I
G
NLOFST
_
FB
TMAX
_
DRP
CS
R
1
R
1
−
*
∗
11
∗
1
EXP
R
−
R
R
n
∗
FB
L
FB
(
R
∗
R
L
_
13
O
_
THERM
MAX
[
and calculate the droop resistor RDRP,
R
B
ROOM
*
+
O
THERM
n
1
R
FB_M
1
THERM
−
*
THERM1
R
1
TMAX
G
( *
at the maximum allowed temperature. R
2
1
CS
T
1
L
* )
.
FB13
_
1
MAX
R
is required to sense the temperature of the power
O
FB
*I
_
O
is incorporated to linearize the NTC thermistor
R
−
*
where R
T
R
_
MAX.
FB
ROOM
1
_
M
/(
R
)]
R
O
THERM.
FB
TMAX1
is the required output impedance of
(17)
FB11
_
FB_M
R
(14)
−
R
//(R
(12)
is calculated from (15).
FB
(13)
R
using (14).
_
THERM
FB13
M
))
(15)
−
+R
(
July 28, 2009
R
must be bigger than
THERM1
THERM
TMAX1
1
+
IR3504
T
). Given the
TMAX
is defined
1
FB1,
)
(16)
can
FB1