LM27262 Controller Datasheet

LM27262 Datasheet, PDF, Equivalent


Part Number

LM27262

Description

Intel CPU Core Voltage Regulator Controller

Manufacture

etcTI

Total Page 25 Pages
Datasheet
Download LM27262 Datasheet


LM27262
OBSOLETE
LM27262
www.ti.com
SNVS262C – MAY 2004 – REVISED SEPTEMBER 2011
LM27262 Intel CPU Core Voltage Regulator Controller for VRD10 Compatible PCs
Check for Samples: LM27262
FEATURES
1
234 Compatible with “VRD10 Voltage Regulation
Specification” for Intel Pentium 4 and Prescott
Processors
• Supports Intel SpeedStep™ Technology (
Geyserville-III™), which Enables Real-Time
Dynamic Switching of the CPU Core Voltage
and the CPU Clock Frequency
• Uses External Gate Drivers (LM2724) for
Maximum Layout Flexibility and Noise
Immunity
• Fixed Frequency PWM Architecture
• Pin Selectable Internal or 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
Range of 0.8375V through 1.6000V
• 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
APPLICATIONS
• Server and Desktop Computer CPU Core
Power Supplies Requiring a 2, 3- or 4-Phase
Voltage Regulator Delivering up to 100A
• Transportable Notebook Computers Using
Desktop CPUs
• Low Cost Transportable Notebook Computers
Using 2- or 3-Phase Designs
KEY SPECIFICATIONS
• Fast Transient Response to Minimize Output
Capacitor Requirements
• Shorter Design Cycles Through the Use of
External Gate Drivers for Reduced Power
Dissipation, Ease of PCB Layout and Reduced
Noise Sensitivity
• Fully Integrated Solution. All VRD-10 Control
Functions Provided by a Single Device
• Accurate Current Balancing Eliminates Need
to Over Design the Power Path
• Fixed Frequency PWM Minimizes EMI Issues
• Low Input Capacitor Requirements Due to
Multi-Phase Interleaving
• Fault Latching Allows Use of Smaller Power
Path Components and Minimizes the Chance
of Damage to the Load in the Event of a Fault
• Only Need to Buy as Many Drivers as the
Design Needs while Keeping Only One
Controller in Inventory
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Pentium is a trademark of Intel Corporation..
2
SpeedStep, Geyserville-III, Prescott are trademarks of dcl_owner.
3
All other trademarks are the property of their respective owners.
4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2011, Texas Instruments Incorporated

LM27262
LM27262
OBSOLETE
SNVS262C – MAY 2004 – REVISED SEPTEMBER 2011
www.ti.com
DESCRIPTION
The LM27262 is a versatile synchronous buck voltage regulator controller designed according to the Intel VRD10
Specification. It’s a fixed-frequency voltage-mode control PWM with average current modulation of the reference
voltage to achieve the desired output impedance. This approach imparts a pseudo current mode behavior to the
control loop. The part provides the control for a voltage regulator consisting of either 2-, 3- or 4-phases to provide
power to a desktop CPU. Pulse-by-pulse phase current balancing ensures accurate 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 “on the fly”.
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’s Pentium™4 and Prescott™
processors.
The LM27262 is available in a 48-lead TSSOP package and in a 48-lead WQFN package.
Typical Application Circuit
+V3.3S
R1
VRE
F
6.8k
C3
C1 C2
1 PF
1
3 1 PF 0.1 PF
2
CR2
LM27201 Optional External
Reference
C4
0.1 PF
U1
R4
1 PHASE
VRO 48
C7
1000 pF
R2
976_1%
17.4k_1%
2
309_1%
C9
10 nF
3
4
R3 5
R7 6
4.75k_1% 7
VR_VID
VR_0VID
VR_1VID
VR_2VID
VR_3VID
VR_4VID
5
8
9
10
11
12
13
14
S
IREF
VSTDO
VPSRO
NG
C
SLADI1
SLADI2
VID0
VID1
VID2
VID3
VID4
VID5
VDA
PWNRG 47
SOFDTCA 46
VIDPSLE 45
VIWDPG 44
DVIH 43
A
VILA
42
VIH 41
B
VILB
40
VIH 39
C
VILC
38
VIH 37
D
VILD
36
VF 35
15 NC
COBM 34
16 CN
VCOPR 33
17 CN
DEELA 32
18 CN
DYRV 31
19 CCLIMAD
DARV 30
R10
28.4k_1%
+V5
S
20 REFJIN
21
T
VCC5V
22 VRE
23 GFN
DBRV
DCRV
DN
CN
29
28
27
26
C6 24 ND
CN 25
1 PF
R15
C
LM2762MTD
C
147k_1% VRE
F
U2
C14
0.22 PF
2.2 R21
DR_
A
1S
2
W
HG
3 CBOO
4 PWTM_I
N
CCRM4 DSH-3- LM2724
NSR
C17
2.2 PF
GN
D
LC
VCC
SYNCE
N
+V5
S
8
7
6
5
R17 10k
1 Q1
2
3
4
8
7
6
5
S7392DY
1 Q4
2
3
4
8
7
6
5
S7356DY
Typical power stage. Include from 1 to
4 as application requires.
VR_O
VRN_PWRG
D
R9 750
VccVID_PG
DVIH
A
VILA
VIH
B
VILB
VIH
C
VILC
VIH
D
VILD
Vcore
DR_
DAR_
DBR_
C
DR_D
C10
0.01 PF
C12
470 pF
C11 R13 15k
12 nF
R12 1.5k
R11
C3
0.1 PF
1.5k
C13
1000 pF
Notes:
1. If external Reference is used, tie REFINT (pin 20) to ground.
2. Add output decoupling capacitors as required for transient response
and output ripple voltage requirements.
3. Connect Pin 1, "Phase" as required for the desired number of phases.
4 phase = float, 3 phase = gnd, 2 phase = 5V.
+V12D
C
1 Q2
2
3
4
8
7
6
5
S7392DY
1 Q7
2
3
4
8
7
6
5
S7356DY
C15 +
15 PF
C16
1.0 PF
L2
0.69 PH
R22
5.1
C18
680 pF
R19 Vcore
0.002_1%
R26 R29
+
1
1000 pF
1 C19
300 PF,
2V
C8 VILA
VIH
A
C20
22 PF
2 Submit Documentation Feedback
Product Folder Links: LM27262
Copyright © 2004–2011, Texas Instruments Incorporated


Features OBSOLETE LM27262 www.ti.com SNVS262C – MAY 2004 – REVISED SEPTEMBER 2011 LM27262 Intel CPU Core Voltage Regula tor Controller for VRD10 Compatible PCs Check for Samples: LM27262 FEATURES 1 •234 Compatible with “VRD10 Voltag e Regulation Specification” for Intel Pentium 4 and Prescott Processors • Supports Intel SpeedStep™ Technology ( Geyserville-III™), which Enables Re al-Time Dynamic Switching of the CPU Co re Voltage and the CPU Clock Frequency • Uses External Gate Drivers (LM2724) for Maximum Layout Flexibility and Noi se Immunity • Fixed Frequency PWM Arc hitecture • Pin Selectable Internal o r External Voltage Reference • 0.5% C ore Voltage Set-Point Accuracy when Usi ng External Voltage Reference • 0.9% Accurate Internal Bandgap Reference • 2-, 3- or 4-Phase Operation • Out-of -Phase Switching Reduces Input Ripple C urrent, Thereby Minimizing Input Capaci tor Requirements • VID-Code Programma ble Output Voltage Range of 0.8375V through 1.6000V • User Programmable, Low Loss, Load Line Sl.
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