ISL6334BCRZ Intersil, ISL6334BCRZ Datasheet - Page 16

• Manufacturer Part Number: ISL6334BCRZ
• Description: IC CTRLR PWM SYNC BUCK 40-QFN
• Manufacturer: Intersil

Specifications of ISL6334BCRZ

• Applications: Controller, Intel VR11.1
• Voltage - Input: 3 ~ 12 V
• Number Of Outputs: 1
• Voltage - Output: 0.5 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 40-VFQFN, 40-VFQFPN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

total load current. Channel current balance is achieved by
comparing the sensed current of each channel to the
average current to make an appropriate adjustment to the
PWM duty cycle of each channel with Intersil’s patented
current-balance method.
Channel current balance is essential in achieving the
thermal advantage of multiphase operation. With good
current balance, the power loss is equally dissipated over
multiple devices and a greater area.
Voltage Regulation
The compensation network shown in Figure 6 assures that
the steady-state error in the output voltage is limited only to
the error in the reference voltage (output of the DAC) and
offset errors in the OFS current source, remote-sense and
error amplifiers. Intersil specifies the guaranteed tolerance of
the ISL6334B, ISL6334C to include the combined tolerances
of each of these elements.
The sensed average current I
This current will develop voltage drop across the resistor
between FB and VDIFF pins for droop control. ISL6334B,
ISL6334C can not be used for non-droop applications.
The output of the error amplifier, V
sawtooth waveforms to generate the PWM signals. The
PWM signals control the timing of the Intersil MOSFET
drivers and regulate the converter output to the specified
reference voltage. The internal and external circuitry, which
control voltage regulation, are illustrated in Figure 6.
The ISL6334B, ISL6334C 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
FIGURE 6. OUTPUT VOLTAGE AND LOAD-LINE
R
FB
V
V
OUT
OUT
+
-
EXTERNAL CIRCUIT ISL6334B, ISL6334C
V
DROOP
C
R
REF
+
-
C
REGULATION WITH OFFSET ADJUSTMENT
R
C
REF
C
COMP
VDIFF
RGND
VSEN
DAC
REF
FB
16
AVG
I
AVG
is tied to FB internally.
COMP
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
ERROR AMPLIFIER
+
-
, is compared to
+
-
V
COMP
ISL6334B, ISL6334C
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
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 VID7
through VID0. The DAC decodes the eight 6-bit logic signal
(VID) into one of the discrete voltages shown in Table 2. All
VID pins have no internal pull-up current sources until after
t
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 in case leakage into the driving device is greater
than 30µA.
D3
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
. After t
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
, each VID input offers a minimum 30µA pull-up
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
TABLE 2. VR11 VID 8-BIT
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
DIFF
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
, is connected to the inverting
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
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
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
August 31, 2010
1.60000
1.59375
1.58750
1.58125
1.57500
1.56875
1.56250
1.55625
1.55000
1.54375
1.53750
1.53125
1.52500
1.51875
1.51250
1.50625
1.50000
1.49375
1.48750
1.48125
1.47500
1.46875
1.46250
1.45625
OFF
OFF
FN6689.2