ISL6552_04 Datasheet, PDF (4/18 Pages) Intersil Corporation – Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller

Simplified Power System Diagram
ISL6552
VSEN
PWM 1
PWM 2
ISL6552
PWM 3
PWM 4
VID
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
MICROPROCESSOR
Functional Pin Description
ISL6552CB (20 LEAD SOIC)
VID3 1
VID2 2
VID1 3
VID0 4
VID25mV 5
COMP 6
FB 7
FS/DIS 8
GND 9
VSEN 10
20 VCC
19 _PGOOD
18 _PWM4
17 _ISEN4
16 _ISEN1
15 _PWM1
14 _PWM2
13 ISEN2
12 ISEN3
11 PWM3
ISL6552CR (20 LEAD 5x5 QFN)
20 19 18 17 16
VID1 1
VID0 2
VID25mV 3
COMP 4
FB 5
GND
15 ISEN4
14 ISEN1
13 PWM1
12 PWM2
11 ISEN2
6 7 8 9 10
4
VID3, VID2, VID1, VID0 and VID25mV
Voltage Identification inputs from microprocessor. These pins
respond to TTL and 3.3V logic signals. The ISL6552 decodes
VID bits to establish the output voltage. See Table 1.
COMP
Output of the internal error amplifier. Connect this pin to the
external feedback and compensation network.
FB
Inverting input of the internal error amplifier.
FS/DIS
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
Bias and reference ground. All signals are referenced to this
pin.
VSEN
Power good monitor input. Connect to the microprocessor-
CORE voltage.
PWM1, PWM2, PWM3 and PWM4
PWM outputs for each driven channel in use. Connect these
pins to the PWM input of a HIP6601, HIP6602, HIP6603
driver. For systems which use 3 channels, connect PWM4
high. Two channel systems connect PWM3 and PWM4 high.