Microprocessor CORE Voltage Regulator
Multi-Phase Buck PWM Controller
The ISL6552 multi-phase PWM control IC together with its
companion gate drivers, the HIP6601, HIP6602 or HIP6603
and external Intersil MOSFETs provides a precision voltage
regulation system for advanced microprocessors.
Multi-phase power conversion is a marked departure from
earlier single phase converter configurations previously
employed to satisfy the ever increasing current demands of
modern microprocessors. Multi-phase converters, by
distributing the power and load current results in smaller and
lower cost transistors with fewer input and output capacitors.
These reductions accrue from the higher effective
conversion frequency with higher frequency ripple current
due to the phase interleaving process of this topology. For
example, a three phase converter operating at 350kHz will
have a ripple frequency of 1.05MHz. Moreover, greater
converter bandwidth of this design results in faster response
to load transients.
Outstanding features of this controller IC include
programmable VID codes from the microprocessor that
range from 1.05V to 1.825V with a system accuracy of ±1%.
Pull up currents on these VID pins eliminates the need for
external pull up resistors. In addition “droop” compensation,
used to reduce the overshoot or undershoot of the CORE
voltage, is easily programmed with a single resistor.
Another feature of this controller IC is the PGOOD monitor
circuit which is held low until the CORE voltage increases,
during its Soft-Start sequence, to within 10% of the
programmed voltage. Over-voltage, 15% above
programmed CORE voltage, results in the converter shutting
down and turning the lower MOSFETs ON to clamp and
protect the microprocessor. Under voltage is also detected
and results in PGOOD low if the CORE voltage falls 10%
below the programmed level. Over-current protection
reduces the regulator RMS output current to 41% of the
programmed over-current trip value. These features provide
monitoring and protection for the microprocessor and power
• Multi-Phase Power Conversion
• Precision Channel Current Sharing
- Loss Less Current Sampling - Uses rDS(ON)
• Precision CORE Voltage Regulation
- ±1% System Accuracy Over Temperature
• Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 1.05V to 1.825V in 25mV Steps
- Programmable “Droop” Voltage
• Fast Transient Recovery Time
• Over Current Protection
• Automatic Selection of 2, 3, or 4 Phase Operation
• High Ripple Frequency (Channel Frequency) Times
Number Channels . . . . . . . . . . . . . . . . . .100kHz to 6MHz
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
PART NUMBER TEMP. (oC) PACKAGE PKG. DWG. #
0 to 70 20 Ld SOIC M20.3
20 Ld SOIC Tape and Reel
0 to 70 20 Ld 5x5 QFN L20.5x5
20 Ld QFN Tape and Reel
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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