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ISL6553 Datasheet(PDF) 3 Page - Intersil Corporation

Part No. ISL6553
Description  Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6553 Datasheet(HTML) 3 Page - Intersil Corporation

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Functional Pin Description
VID3
VID2
VID1
VID0
VID25mV
FS/DIS
VSEN
PGOOD
PWM1
PWM2
VCC
FB
ISEN1
COMP
ISEN2
GND
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
VID3 (Pin 1), VID2 (Pin 2), VID1 (Pin 3), VID0 (Pin 4)
and VID25mV (Pin 5)
Voltage Identification inputs from microprocessor. These pins
respond to TTL and 3.3V logic signals. The ISL6553 decodes
VID bits to establish the output voltage. See Table 1.
COMP (Pin 6)
Output of the internal error amplifier. Connect this pin to the
external feedback and compensation network.
FB (Pin 7)
Inverting input of the internal error amplifier.
FS/DIS (Pin 8)
Channel frequency, FSW, select and disable. A resistor from
this pin to ground sets the switching frequency of the
converter. Pulling this pin to ground disables the converter
and three states the PWM outputs. See Figure 10.
GND (Pin 9)
Bias and reference ground. All signals are referenced to this
pin.
VSEN (Pin 10)
Power good monitor input. Connect to the microprocessor-
CORE voltage.
ISEN2 (Pin 11) and ISEN1 (Pin 14)
Current sense inputs from the individual converter channel’s
phase nodes.
PWM2 (Pin 12) and PWM1 (Pin 13)
PWM outputs for each driven channel in use. Connect these
pins to the PWM input of a HIP6601/2/3 driver.
PGOOD (Pin 15)
Power good. This pin provides a logic-high signal when the
microprocessor CORE voltage (VSEN pin) is within specified
limits and Soft-Start has timed out.
VCC (Pin 16)
Bias supply. Connect this pin to a 5V supply.
Typical Application - Two Phase Converter Using HIP6601 Gate Drivers
MAIN
CONTROL
ISL6553
VID2
VID25mV
PGOOD
FB
+5V
COMP
PWM2
PWM1
ISEN2
ISEN1
VSEN
DRIVER
HIP6601
PWM
VCC
BOOT
UGATE
PHASE
LGATE
VIN = +5V
PVCC
PWM
VCC
BOOT
UGATE
PHASE
LGATE
VIN = +5V
DRIVER
HIP6601
PVCC
FS/DIS
GND
GND
GND
VCC
+VCORE
+12V
+12V
VID1
VID3
VID0
ISL6553


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