ISL6223 Datasheet, PDF (1/15 Pages) Intersil Corporation – Mobile Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller

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Data Sheet
February 2003
ISL6223
FN9013
Mobile Microprocessor CORE Voltage
Regulator Multi-Phase Buck PWM
Controller
The ISL6223 multi-phase PWM control IC together with its
companion gate drivers, the HIP6601, HIP6602 or HIP6603
and Intersil MOSFETs provides a precision voltage
regulation system for advanced mobile microprocessors. A
single-stage regulator that directly converts a battery voltage
to a microprocessor core voltage can be designed when high
voltage drivers are employed. Multiphase 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, result 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 two phase converter
operating at 350kHz will have a ripple frequency of 700kHz.
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 0.925V to 2.00V 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 0.9V. Overvoltage, the
CORE voltage going above 2.35V, 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
below 0.9V. Overcurrent protection reduces the regulator
current to less than 25% of the programmed trip value. An
external capacitor connected to the DACOUT pin and
ground slows down the transition of the DAC output to avoid
triggering the overcurrent protection when the VID code
changes. These features provide monitoring and protection
for the microprocessor and power system.
Features
• Mobile VID Compatible Multi-Phase Power Conversion
• Precision Channel Current Sharing
- Loss Less Current Sampling - Uses r_DS(ON)
• Precision CORE Voltage Regulation
- ±1% System Accuracy Over Temperature
• Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 1.30V to 2.00V in 50mV Steps
- 0.925V to 1.275V in 25mV Steps
- Programmable “Droop” Voltage
• Fast Transient Recovery Time
• Over Current Protection
• High Ripple Frequency (Channel Frequency Times
Number of Channels, Two). . . . . . . . . . . .100kHz to 3MHz
Ordering Information
PART NUMBER TEMP. (^oC) PACKAGE PKG. NO.
ISL6223CA
0 to 70 20 Ld SSOP M20.15
ISL6223CA-T
20 Ld SSOP Tape and Reel
ISL6223EVAL1
Evaluation Platform
ISL6223EVAL2
Evaluation Platform
Pinout
ISL6223 (SSOP)
TOP VIEW
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
FS/DIS 8
GND 9
VSEN 10
20 V_CC
19 _PGOOD
18 _NC
17 _NC
16 _ISEN1
15 _PWM1
14 _PWM2
13 ISEN2
12 NC
11 DACOUT
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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