ISL6564CR-T Intersil, ISL6564CR-T Datasheet - Page 15

• Manufacturer Part Number: ISL6564CR-T
• Description: IC CTRLR PWM MULTIPHASE 40-QFN
• Manufacturer: Intersil

Specifications of ISL6564CR-T

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 1.5MHz
• Duty Cycle: 66.7%
• Voltage - Supply: 4.75 V ~ 5.25 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-VFQFN, 40-VFQFPN
• Frequency-max: 1.5MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The ISL6564 incorporates an internal differential remote-
sense amplifier in the feedback path. The amplifier removes
the voltage error encountered when measuring the output
voltage relative to the local controller ground reference point
resulting in a more accurate means of sensing output
voltage. Connect the microprocessor sense pins to the non-
inverting input, VSEN, and inverting input, RGND, of the
remote-sense amplifier. The remote-sense output, V
connected to the inverting input of the error amplifier through
an external resistor.
A digital to analog converter (DAC) generates a reference
voltage based on the state of logic signals at pins VID4
through VID12.5. The DAC decodes the a 6-bit logic signal
(VID) into one of the discrete voltages shown in Table 1.
Each VID input offers a 45µA pull-up to an internal 2.5V
source for use with open-drain outputs. The pull-up current
diminishes to zero above the logic threshold to protect
voltage-sensitive output devices. External pull-up resistors
can augment the pull-up current sources if case leakage into
the driving device is greater than 45µA.
Load-Line Regulation
Some microprocessor manufacturers require a precisely-
controlled output resistance. This dependence of output
voltage on load current is often termed “droop” or “load line”
regulation. By adding a well controlled output impedance,
the output voltage can effectively be level shifted in a
direction which works to achieve the load-line regulation
required by these manufacturers.
FIGURE 8. OUTPUT VOLTAGE AND LOAD-LINE
R
FB
V
V
EXTERNAL CIRCUIT
OUT
OUT
+
-
V
DROOP
C
R
REF
+
-
C
REGULATION WITH OFFSET ADJUSTMENT
R
C
REF
C
IDROOP
COMP
VDIFF
RGND
VSEN
DAC
REF
FB
15
ISL6564 INTERNAL CIRCUIT
I
AVG
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
ERROR AMPLIFIER
+
-
+
-
V
COMP
DIFF
, is
ISL6564
VID5
400
mV
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
TABLE 1. VOLTAGE IDENTIFICATION (VID) CODES
VID4
200
mV
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
VID3
100
mV
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
VID2
mv
50
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
mV
25
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
12.5
mV
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
December 27, 2004
1.3000V
1.2875V
1.2750V
1.2625V
1.2500V
1.2375V
1.2250V
1.2125V
1.2000V
1.1875V
1.1750V
1.1625V
1.1500V
1.1375V
1.1000V
1.0875V
1.0750V
1.0625V
1.0500V
1.0375V
1.0250V
1.0125V
1.0000V
0.9875V
0.9750V
0.9625V
0.9500V
0.9375V
0.9250V
0.9125V
0.9000V
0.8875V
0.8750V
1.1250v
1.1125V
VDAC
OFF
FN9156.2