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LM27262MTD
Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
LM27262
Intel CPU Core Voltage Regulator Controller for VRD10
Compatible PCs
General DescriptionThe LM27262isa versatile synchronous buck voltage regu-
lator controller designed accordingtothe Intel VRD10 Speci-
fication.It’sa fixed-frequency voltage-mode control PWM
with average current modulationof the reference voltageto
achieve the desired output impedance. This approach im-
partsa pseudo current mode behaviorto the control loop.
The part providesthe controlfora voltage regulator consist-
ingof either2-,3-or 4-phasesto provide powertoa desktop
CPU. Pulse-by-pulse phase current balancing ensures ac-
curate current sharing. CPU core currentsof over 90A can supported without requiring significant over designofthe
power path. The LM27262 containsa precision 6-bit digital-
to-analog converter (DAC) that usesa VID-code providedby
the CPUto program the desired CPU core voltage. The
regulator output voltage canbe dynamically adjustedby
changingthe VID-code “onthe fly”.
The partis intendedto provideallthe specified functions laid
outin the VRD-10 specification, makingitas simpleas
possiblefor the userto realizea fully compliant CPU core
supplyfor Intel’s Pentium™4 and Prescott™ processors.
The LM27262is availableina 48-lead TSSOP package anda 48-lead LLP package.
Features Compatible with “VRD10 Voltage Regulation
Specification”for Intel Pentium4 and Prescott
Processors Supports Intel SpeedStep™ technology
(Geyserville-III™), which enables real-time dynamic
switchingof the CPU core voltage andthe CPU clock
frequency Uses external gate drivers (LM2724)for maximum
layout flexibility and noise immunity Fixed frequency PWM architecture Pin selectable internalor external voltage reference 0.5% core voltage set-point accuracy when using
external voltage reference 0.9% accurate internal bandgap reference 2-,3-or 4-phase operation Out-of-phase switching reduces input ripple current,
thereby minimizing input capacitor requirements VID-code programmable output voltage rangeof
0.8375V through 1.6000V User programmable, low loss, load line slope User programmable Standard VID offset User programmable VCORE slew rate5V powerrail Under Voltage Lock Out (UVLO) Over Voltage Protection (OVP), Under Voltage
Protection (UVP), and Over Current Protection (OCP)to
defend against potentially catastrophic events User programmable fault latch that canbe usedto
disablethe regulatorin the eventa power system fault Very fast transient response VID-transition masked PWRGOOD output True-differential current sensingfor each phase ensures
accurate load current sharing User programmable cycle-by-cycle current limit
Key Specifications Fast transient responseto minimize output capacitor
requirements Shorter design cycles through the useof external gate
driversfor reduced power dissipation, easeof PCB
layout and reduced noise sensitivity Fully integrated solution.All VRD-10 control functions
providedbya single device Accurate current balancing eliminates needto over
designthe power path Fixed frequency PWM minimizes EMI issues Low input capacitor requirements dueto multi-phase
interleaving Fault latching allows useof smaller power path
components and minimizesthe chanceof damageto
the loadinthe eventofa fault Only needto buyas many driversas the design needs
while keeping only one controllerin inventory
Applications Server and desktop computer CPU core power supplies
requiringa2,3-or 4-phase voltage regulator deliveringto 100A Transportable notebook computers using desktop CPUs Low cost transportable notebook computers using2-or
3-phase designs
October 2004
LM27262
Intel
CPU
Core
oltage
Regulator
Controller
for
VRD10
Compatible
PCs
