IR3513ZMTRPBF International Rectifier, IR3513ZMTRPBF Datasheet - Page 27

• Manufacturer Part Number: IR3513ZMTRPBF
• Description: IC CTRL XPHASE3 POL 32-MLPQ
• Manufacturer: International Rectifier
• Series: XPhase3™r

Specifications of IR3513ZMTRPBF

• Applications: Processor
• Current - Supply: 3mA
• Voltage - Supply: 8 V ~ 16 V
• Operating Temperature: 0°C ~ 125°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

Over Current Setting Resistor R
The inductor DC resistance is utilized to sense the inductor current. The copper wire of the inductor has a
constant temperature coefficient of 3850 ppm/°C, and therefore the maximum inductor DCR can be calculated
from (5). R
temperature (T_
The total input offset voltage (V
(V
sense resistor R
The over-current limit is set by the external resistor, R
current limit. I
determined by equation (9). G
to peak ripple of the net inductor current is much smaller than the stand alone phase due to interleaving. The ratio
of the peak to average current in this case can be approximated using (8).
Where
Vout Programming Resistor R
The Feedback pin (FB) is connected to an external resistor divider to set the output voltage. The error amplifier
has a 0.8 V reference (Typical) and the output voltage is determined by selecting resistor divider values (See
Figure 1).
CS_OFST)
Page 27
of the amplifier itself and that created by the amplifier input bias current flowing through the current
L_MAX
OCSET,
ROOM),
CS
.
and R
the bias current of OCSET pin, changes with switching frequency set by resistor R
respectively.
I
n=Number of phases
K
G
I
D=Vo/V
m=Maximum integer that doesn’t exceed (n*D)
V
K
R
R
Iocset
LIMIT
OCSET
R
CS
P
OCSET
CS
L
P
L_ROOM
=Ratio of the peak to average current for the inductor
FB
_
=
=Maximum over current limit
_
=Gain of the current sense amplifier
MAX
TOFST
3
⎡
⎢
⎣
= Determined by the ROSC and given (9)
CS
V
=
=
I
=
I
FB1
⋅
=
Vout
CS_TOFST
[
is the gain of the current sense amplifier. In a multiphase architecture the peak
D
(
R
OCSET
I
I
Rosc
R
=
LIMIT
LIMIT
are the inductor DCR value at maximum temperature (T
⋅
FB
and R
REPLACEMENT PRODUCT – IR3513ZMTRPBF
L
1 (
V
n
_
1
CS
NOT RECOMMENDED FOR NEW DESIGNS
−
600
ROOM
*
−
/
D
(
_
n
∗
0
K
0
OFST
)
)
R
8 .
⋅
FB3
8 .
⋅
) of current sense amplifier in phase ICs is the sum of input offset
Ω
L
L
n
∗
_
⋅
⋅
)
1 [
(
MAX
+
f
D
sw
+
I
−
⋅
CSIN
3850
2
∗
m
n
⋅
1 (
D
)
+
⋅
+
⋅
(
∗
*
1 (
m
K
10
R
OCSET,
n
−
P
+
CS
)
D
−
1
6
+
−
)
∗
V
D
CS
(
T
)
as defined in (7), where I
⎤
⎥
⎦
L
_
_
TOFST
MAX
]
−
∗
T
G
ROOM
CS
/
I
OCSET
)]
LIMIT
(10)
(5)
(6)
(7)
(8)
(9)
May 11, 2008
is the required over
L_MAX
IR3513
) and room
OSC
and is