ISL6553 Datasheet, PDF (3/15 Pages) Intersil Corporation – Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller

ISL6553
Functional Pin Description
VID3 1
VID2 2
VID1 3
VID0 4
VID25mV 5
COMP 6
FB 7
FS/DIS 8
16 VCC
15 PGOOD
14 ISEN1
13 PWM1
12 PWM2
11 ISEN2
10 VSEN
9 GND
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, F_SW, 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
+12V
PVCC
BOOT
UGATE
VCC
PHASE
DRIVER
+5V
PWM HIP6601 LGATE
GND
V_IN = +5V
+V_CORE
PGOOD
VID3
VID2
VID1
VID0
VID25mV
FB
VSEN
COMP
VCC
PWM2
ISEN2
MAIN
CONTROL
ISL6553
PWM1
FS/DIS
GND
ISEN1
+12V
BOOT
PVCC
VCC
PWM
DRIVER
HIP6601
UGATE
PHASE
LGATE
GND
V_IN = +5V
3