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LM27262LQ Datasheet

  • LM27262LQ

  • National Semiconductor [Intel CPU Core Voltage Regulator Co...

  • NSC

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LM27262 Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
October 2004
LM27262
Intel CPU Core Voltage Regulator Controller for VRD10
Compatible PCs
General Description
The LM27262 is a versatile synchronous buck voltage regu-
lator controller designed according to the Intel VRD10 Speci-
fication. It鈥檚 a fixed-frequency voltage-mode control PWM
with average current modulation of the reference voltage to
achieve the desired output impedance. This approach im-
parts a pseudo current mode behavior to the control loop.
The part provides the control for a voltage regulator consist-
ing of either 2-, 3- or 4-phases to provide power to a desktop
CPU. Pulse-by-pulse phase current balancing ensures ac-
curate current sharing. CPU core currents of over 90A can
be supported without requiring significant over design of the
power path. The LM27262 contains a precision 6-bit digital-
to-analog converter (DAC) that uses a VID-code provided by
the CPU to program the desired CPU core voltage. The
regulator output voltage can be dynamically adjusted by
changing the VID-code 鈥渙n the fly鈥?
The part is intended to provide all the specified functions laid
out in the VRD-10 specification, making it as simple as
possible for the user to realize a fully compliant CPU core
supply for Intel鈥檚 Pentium
鈩?/div>
4 and Prescott
鈩?/div>
processors.
The LM27262 is available in a 48-lead TSSOP package and
in a 48-lead LLP package.
n
n
n
n
n
User programmable, low loss, load line slope
User programmable Standard VID offset
User programmable VCORE slew rate
5V power rail 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 can be used to
disable the regulator in the event a power system fault
Very fast transient response
VID-transition masked PWRGOOD output
True-differential current sensing for each phase ensures
accurate load current sharing
User programmable cycle-by-cycle current limit
n
n
n
n
n
Key Specifications
n
Fast transient response to minimize output capacitor
requirements
n
Shorter design cycles through the use of external gate
drivers for reduced power dissipation, ease of PCB
layout and reduced noise sensitivity
n
Fully integrated solution. All VRD-10 control functions
provided by a single device
n
Accurate current balancing eliminates need to over
design the power path
n
Fixed frequency PWM minimizes EMI issues
n
Low input capacitor requirements due to multi-phase
interleaving
n
Fault latching allows use of smaller power path
components and minimizes the chance of damage to
the load in the event of a fault
n
Only need to buy as many drivers as the design needs
while keeping only one controller in inventory
Features
n
Compatible with 鈥淰RD10 Voltage Regulation
Specification鈥?for Intel Pentium 4 and Prescott
Processors
n
Supports Intel SpeedStep
鈩?/div>
technology
(Geyserville-III
鈩?/div>
), which enables real-time dynamic
switching of the CPU core voltage and the CPU clock
frequency
n
Uses external gate drivers (LM2724) for maximum
layout flexibility and noise immunity
n
Fixed frequency PWM architecture
n
Pin selectable internal or external voltage reference
n
0.5% core voltage set-point accuracy when using
external voltage reference
n
0.9% accurate internal bandgap reference
n
2-, 3- or 4-phase operation
n
Out-of-phase switching reduces input ripple current,
thereby minimizing input capacitor requirements
n
VID-code programmable output voltage range of
0.8375V through 1.6000V
Applications
n
Server and desktop computer CPU core power supplies
requiring a 2, 3- or 4-phase voltage regulator delivering
up to 100A
n
Transportable notebook computers using desktop CPUs
n
Low cost transportable notebook computers using 2- or
3-phase designs
Pentium
鈩?/div>
is a trademark of Intel Corporation.
漏 2005 National Semiconductor Corporation
DS200834
www.national.com

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