ISL6553 Intersil Corporation, ISL6553 Datasheet - Page 3

• Manufacturer Part Number: ISL6553
• Description: Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
• Manufacturer: Intersil Corporation

Functional Pin Description
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)
Typical Application - Two Phase Converter Using HIP6601 Gate Drivers
PGOOD
VID25mV
VID3
VID2
VID1
VID0
VID25mV
FS/DIS
COMP
VID3
VID2
VID1
VID0
VSEN
FS/DIS
FB
FB
CONTROL
ISL6553
1
2
3
4
5
6
7
8
GND
MAIN
COMP
3
PWM2
PWM1
ISEN2
ISEN1
VCC
16
15
14
13
12
11
10
9
+5V
VCC
PGOOD
ISEN1
PWM1
PWM2
ISEN2
VSEN
GND
+12V
+12V
PWM
PWM
VCC
VCC
PVCC
PVCC
DRIVER
HIP6601
DRIVER
HIP6601
ISL6553
BOOT
BOOT
Channel frequency, F
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.
UGATE
PHASE
LGATE
GND
UGATE
PHASE
LGATE
GND
SW
V
V
, select and disable. A resistor from
IN
IN
= +5V
= +5V
+V
CORE