ISL6218CV Intersil, ISL6218CV Datasheet - Page 9

• 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

The choice of value for soft-start capacitor is determined by
the maximum slew rate required for the application. An
example calculation is shown in Equation 1. Using the I1
current source on the SOFT pin as 130µA, and the slew rate
of (10mV/μs), the SOFT capacitor is calculated in Equation 1:
Gate Drive Signals
The ISL6218 provides internal gate drive for a single
channel, Synchronous Buck, Core Regulator.
The ISL6218 was designed with a 4A, low side gate current
sink ability, and a 2A, low-side gate current source ability to
efficiently drive the latest, high performance MOSFETs. This
feature will provide the system designer with flexibility in
MOSFET selection as well as optimum efficiency during all
modes of operation.
Frequency Setting
The power channel switching frequency is set up by a
resistor from the FSET pin to ground. The choice of FSET
resistance for a desired switching frequency can be
approximated using Figure 3. The switching frequency is
designed to operate between 250kHz and 500kHz per
phase.
CORE Voltage Programming
The voltage identification pins (VID0, VID1, VID2, VID3,
VID4 and VID5) set the DAC output voltage. These pins do
not have internal pull-up or pull-down capability. These pins
will recognize 1.0V, 3.3V or 5.0V CMOS logic. Table 1 shows
the command voltage, V
The IC responds to VID code changes as shown in Figure 5.
PGOOD is masked between these transitions.
C
SOFT
FIGURE 3. CHANNEL SWITCHING FREQUENCY vs R
250
200
150
100
50
0
250k
=
SlewRate
I
SOURCE
CHANNEL SWITCHING FREQUENCY, f
=
130
500k
µA
DAC
⋅
10
for the 6 bit VID codes.
1
µs
9
mV
≈
. 0
012
750k
µF
SW
(Hz)
FSET
(EQ. 1)
1M
ISL6218
SOFT
FIGURE 4. SOFT-START TRACKING CIRCUITRY SHOWING
VID5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VID4
C
TABLE 1. INTEL IMPV-IV VID CODES
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
SOFT
INTERNAL CURRENT SOURCES AND “DROOP”
FOR ACTIVE, DEEP AND DEEPER SLEEP
MODES OF OPERATION
+ V
R
DROOP
DROOP
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
I
DROOP
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
EA+
ISL6218
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
+
AMPLIFIER
VID0
ERROR
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
August 6, 2007
VDAC
1.708
1.692
1.676
1.660
1.644
1.628
1.612
1.596
1.580
1.564
1.548
1.532
1.516
1.500
1.484
1.468
1.452
1.436
1.420
1.404
FN9101.6