ISL6218CV Intersil, ISL6218CV Datasheet - Page 15

• Manufacturer Part Number: ISL6218CV
• Description: IC CTRLR INTEL PENT M 38-TSSOP
• Manufacturer: Intersil

Specifications of ISL6218CV

• Applications: Processor
• Current - Supply: 1.4mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -10°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

approximately ½ of the I
Diagram” on page 7. The Droop current is sourced out of the
SOFT pin through the Droop resistor and returns through the
EA+ pin. This creates a “Droop” voltage V
subtracts from the IMVP-IV
generate the voltage setpoint for the CORE regulator.
Full load current for the Intel IMVP-IV
specification is 25A. Knowing that the Droop Current,
sourced out of the SOFT pin will be ½ of the I
resistor, R
voltage “Droop” required at full load. The selection of this
resistor is explained “Selection of RDROOP” on page 15.
SELECTION OF R
Figure 11 shows a static “Droop” load line for the 1.484V
Active Mode. The ISL6218, as previously mentioned, allows
the programming of the load line slope by the selection of
the R
As per the Intel IMVP-IV
Droop = 0.003 (Ω). Therefore, 25A of full load current
equates to a 0.075V Droop output voltage from the VID
setpoint. R
calculated through Equation 3, r
the “Block Diagram” on page 7 or Equation 6:
V DROOP
R
FIGURE 10. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6218 VOLTAGE AND CURRENT CONTROL LOOPS FOR THE SINGLE CHANNEL
DROOP
DROOP
+
_
C SOFT
=
DROOP
SOFT
DROOP
R DROOP
2
EA+
resistor.
3 .
REGULATOR.
⋅
, can be selected to provide the amount of
(
Droop
can be selected based on R
DROOP
ISL6218
FB
I DROOP
)
IMVP IV
REFERENCE
AMPLIFIER
SEN
™
⋅
ERROR
r
-
+
and IMVP-IV+
(
R
DSON
™
, as shown in the “Block
ISEN
R2
M
15
reference voltage on SOFT to
C2
V ERROR1
(DS(ON)
)
C1
(
Ω
)
™
COMP
Thin and Light
COMPARATOR
and Droop, as per
R1
™
DROOP
specification,
-
+
SEN
ISEN
, that
, a “Droop”
which is
(EQ. 6)
C DCPL
I
I
OCSET
SEN
ISL6218
OVER-UNDER
VOLTAGE
CURRENT
CIRCUIT
SENSING
CURRENT
PWM
OVER
I
SEN
VSEN
Component Selection Guidelines
Output Capacitor Selection
Output capacitors are required to filter the output inductor
current ripple, and supply the transient load current. The
filtering requirements are a function of the channel switching
frequency and the output ripple current. The load transient
requirements are a function of the slew rate (di/dt) and the
magnitude of the transient load current.
The microprocessor used for IMVP-IV
load rates as high as 30A/ns. High frequency ceramic
capacitors are used to supply the initial transient current, and
slow the rate-of-change seen by the bulk capacitors. Bulk filter
capacitor values are generally determined by the ESR
(Effective Series Resistance) and voltage rating requirements,
rather than actual capacitance requirements. To meet the
stringent requirements of IMVP-IV
Chip” high frequency, ceramic capacitors are placed very close
’
-3m
LOAD LINE
V OUT, NOM
FIGURE 11. IMVP-IV
V OUT, LO
V OUT, HI
UG1
ISEN1
LG1
I
SEN1
I OUT, NL
(0A, 1.506V)
+
V rDS(ON)
R ISEN
STATIC TOLERANCE BANDS
NOMINAL "DROOP" LOAD LINE
™
Q2
ACTIVE MODE STATIC LOAD LINE
(0A, 1.484V)
V IN
-
Q1
V rDS(ON)
-
+
I OUT, MID
PHASE
(0A, 1.462V)
™
L 01
, (15) 2.2µF, 0612 “Flip
I L1
™
will produce transient
V CORE
C OUT
I OUT, MAX
(25A, 1.409V)
(25A, 1.387V)
(25A, 1.431V)
August 6, 2007
R LOAD
FN9101.6