ISL6557ACBZ Intersil, ISL6557ACBZ Datasheet - Page 5

• Manufacturer Part Number: ISL6557ACBZ
• Description: IC CTRLR PWM MULTIPHASE 24-SOIC
• Manufacturer: Intersil

Specifications of ISL6557ACBZ

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 250kHz
• Duty Cycle: 75%
• 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: 24-SOIC (7.5mm Width)
• Frequency-max: 250kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Specifications
NOTES:
Functional Pin Descriptions
VID4, VID3, VID2, VID1, VID0 (Pins 1, 2, 3, 4, 5)
These are the inputs to the internal DAC that provides the
reference voltage for output regulation. Connect these pins
to either open-drain or active-pull-up type outputs. Pulling
these pins above 2.9V can cause a reference offset
inaccuracy.
FB (Pin 7) and COMP (Pin 6)
The internal error amplifier’s inverting input and output
respectively. These pins are connected to an external R-C
network to compensate the regulator.
IOUT (Pin 8)
The current out of this pin is proportional to output current
and is used for load-line regulation and load sharing. The
scale factor is set by the ratio of the ISEN resistors
(connected to pins 14, 15, 18, and 19) to the lower MOSFET
r
VDIFF (Pin 9), VSEN (Pin 10), RGND (Pin 11)
VSEN and RGND are the inputs to the differential remote-
sense amplifier. VDIFF is the output and it serves as the
ISEN
Overcurrent Trip Level
PROTECTION and MONITOR
Overvoltage Threshold
Undervoltage Threshold
PGOOD Low Voltage
DS(ON)
2. These parts are designed and adjusted for accuracy within the system tolerance given in the Electrical Specifications. The system tolerance
3. VID input levels above 2.9V may produce an reference-voltage offset inaccuracy.
accounts for offsets in the differential and error amplifiers; reference-voltage inaccuracies; temperature drift; and the full DAC adjustment range.
.
PARAMETER
COMP
RGND
VDIFF
VSEN
IOUT
VID4
VID3
VID2
VID1
VID0
GND
FB
10
11
12
1
2
3
4
5
6
9
7
8
5
Operating Conditions: V
VSEN Rising
VSEN Falling
VSEN Rising
VSEN Falling
IPGOOD = 4mA
24
23
22
21
20
19
18
17
16
15
14
13
EN
FS
PGOOD
PWM4
ISEN4
ISEN1
PWM1
PWM2
ISEN2
ISEN3
PWM3
VCC
CC
= 5V, T
TEST CONDITIONS
ISL6557A
A
= 0
o
C to 70
input to the external regulation circuitry and the internal
protection circuitry. Connect VSEN and RGND to the sense
pins of the remote load.
GND (Pin 12)
Return for VCC and signal ground for the IC.
PWM3, PWM2, PWM1, PWM4 (Pins 13, 16, 17, 20)
Pulse-width modulation outputs. These logic outputs tell the
driver IC(s) when to turn the MOSFETs on and off.
ISEN3, ISEN2, ISEN1, ISEN4 (PINS 14, 15, 18, 19)
Current sense inputs. A resistor connected between these
pins and the respective phase nodes has a current
proportional to the current in the lower MOSFET during its
conduction interval. The current is used as a reference for
channel balancing, load sharing, protection, and load-line
regulation.
PGOOD (Pin 21)
PGOOD is an open-drain logic output that changes to a logic
low when the differential output voltage at VDIFF swings
below 90% of the DAC setting or above 2.1V.
FS (Pin 22)
This pin has two functions. A resistor placed from FS to
ground sets the switching frequency. There is an inverse
relationship between the value of the resistor and the
switching frequency. This pin can also be used to disable the
controller. To disable the controller, pull this pin below 1V.
EN (Pin 23)
This is the threshold-sensitive enable input for the controller.
To enable the controller, pull this pin above 1.23V.
VCC (Pin 24)
Bias supply voltage for the controller. Connect this pin to a
5V power supply.
o
C, Unless Otherwise Specified. (Continued)
2.04
MIN
-90
TYP
2.09
0.18
VID
-75
92
90
MAX
2.13
-60
0.4
UNITS
%VID
%VID
mV
μA
V
V