ISL6562 Datasheet, PDF (1/5 Pages) Intersil Corporation – Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller

TM
Data Sheet
ISL6562
March 2001
File Number 9012
Microprocessor CORE Voltage Regulator
Two-Phase Buck PWM Controller
The ISL6562 two-phase current mode, PWM control IC
together with companion gate drivers, the HIP6601A,
HIP6602A, HIP6603A or HIP6604 and MOSFETs provides a
precision voltage regulation system for advanced
microprocessors. Two-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 two phase converter operating at
350kHz per phase 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 1.050V to 1.825V with an accuracy of ±0.8%.
Pull up currents on these VID pins eliminates the need for
external pull up resistors.
Another feature of this controller IC is the PWRGD monitor
circuit which is held low until the CORE voltage increases, to
within 18% of the programmed voltage. Over-voltage, 24%
above programmed CORE voltage, results in the PWRGD
output going low to indicate that the CORE is above the
specified limit. Under voltage is also detected and results in
PWRGD going low if the CORE voltage falls 18% below the
programmed level. Over-current protection folds back the
output voltage to 95mV, reducing the regulator dissipation.
These features provide monitoring and protection for the
microprocessor and power system.
Ordering Information
PART NUMBER TEMP. (^oC) PACKAGE PKG. NO.
ISL6562CB
0 to 70 16 Ld SOIC M16.15
ISL6562CB-T
16 Ld SOIC Tape and Reel
ISL6560/62EVAL1 Evaluation Platform
Features
• Two-Phase Power Conversion
• Precision Channel Current Sharing
• Precision CORE Voltage Regulation
- ±0.8% Accuracy
• Microprocessor Voltage Identification Input
- 5-Bit VID Input
- 1.050V to 1.825V in 25mV Steps
- Programmable “Droop” Voltage
• Fast Transient Recovery Time
• Over Current Protection
• High Ripple Frequency, (Channel Frequency
Times Number of Channels). . . . . . . . . . . . .100kHz to 2MHz
Applications
• VRM8.5 Modules
• Intel® Tualatin Processor Voltage Regulator
• Low Output Voltage, High Current DC/DC Converters
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Pinout
ISL6562 (SOIC)
TOP VIEW
VID3 1
VID2 2
VID1 3
VID0 4
VID25mV 5
COMP 6
FB 7
CT 8
16 VCC
15 REF
14 CS-
13 PWM1
12 PWM2
11 CS+
10 PWRGD
9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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