Analog DC064B Pentium Processor Switching Regulator Power Module
High-efficiency 5V to 3.3V/3.5V switching regulator module for Intel Pentium VR/VRE processors featuring the LTC1266 and LT1431.
Overview
Demonstration Circuit 064B is a power supply module compliant with Intel specifications for powering Pentium processors, including VR and VRE versions. It operates from a 5.0V ±5% input and provides jumper-selectable output voltages of 3.30V, 3.383V (VR), and 3.525V (VRE). The circuit design utilizes the LTC1266 current-mode synchronous buck switching regulator controller and the LT1431 precision shunt regulator as a high-gain error amplifier and reference. This architecture enables tight static tolerances of 0.65% and fast transient response. The module uses all N-channel MOSFETs, operates at approximately 200kHz to minimize inductor size, and maintains efficiency above 90% across most of the load range. It is designed to interface via a standard 30-pin header.
Use Cases
- Powering Intel Pentium VR and VRE processors
- High-efficiency 5V step-down voltage regulation
- Intel-compliant power module design
- Synchronous buck regulator evaluation with N-channel MOSFETs
Topics
Referenced Parts
12065C104ZAT2A
AVX
C12 1 12065C104ZAT2A Cap., X7R, .1μF, 50V, 20% AVX
12065C501MAT2A
AVX
C14 1 12065C501MAT2A Cap., X7R, 500pF, 50V, 20% AVX
CR32-333J-T
AVX
R6 1 CR32-333J-T Res., SMT-1206, 33kΩ, 5% AVX
627V100
BI Technologies
R1 1 627V100 Res., Network BI TECH
CTX3-6-52
Coiltronics
L1 (Note 1) 1 CTX3-6-52 Inductor, Toroid, 3μH COILTRONICS
WSL-2512-0.015-1%
Dale
R2 1 WSL-2512-0.015-1% Res., SMT-2512, 0.015, 1W, 1% DALE
LT1431CS8
Linear Technology
U2 1 LT1431CS8 I.C., SO8, LT1431, Prog Ref LTC
LTC1266CS16
Linear Technology
U1 1 LTC1266CS16 I.C., SO16, LTC1266, Sw-Reg LTC
Si4410DY
Siliconix
Q1 1 Si4410DY Xistor, MOSFET, Si4410, SO-8 SILICONIX
Si9410DY
Siliconix
Q2 1 Si9410DY Xistor, MOSFET, Si9410, SO-8 SILICONIX
51-656
Gowanda Electronics
Note 1. Alternate source: Gowanda Electronics Part # 51-656.
10V
AVX
*Assumes 6 each, 100μF, 10V, AVX type TPS tantalum capacitors or equivalent and 10 each, 1μF 1206 ceramics at the load.
25V
AVX
C11,15 2 12063G105ZAT2A Cap., Y5V, 1μF, 25V AVX (803) 946-0362
2.0V
Maxim
amplifier output to its 2.0V maximum. In this configura-
| 12063G105ZAT2A | AVX | C11,15 2 12063G105ZAT2A Cap., Y5V, 1μF, 25V AVX |
| 12063G224ZAT2A | AVX | C10 1 12063G224ZAT2A Cap., Y5V, .22μF, 25V, 20% AVX |
| 12065A101KAT2A | AVX | C8 1 12065A101KAT2A Cap., NPO, 100pF, 50V, 10% AVX |
| 12065C102ZAT2A | AVX | C9 1 12065C102ZAT2A Cap., X7R, 1000pF, 50V, 20% AVX |
| 12065C332MAT2A | AVX | C13 1 12065C332MAT2A Cap., X7R, 3300pF, 50V, 20% AVX |
| TPSE227M010R0100 | AVX | C1-3 3 TPSE227M010R0100 Cap., Tantalum, 220μF, 10V, 20% AVX |
| TPSE337M006R0100 | AVX | C7 4 TPSE337M006R0100 Cap., Tantalum, 330μF, 6.3V, 20% AVX |
| MBR0520LT1 | Motorola | D1,D2 2 MBR0520LT1 Diode, Schottky, 20V, 0.5A MOTOROLA |
| MBRS130LT3 | Motorola | D3 1 MBRS130LT3 Diode, Schottky, 30V, 1A MOTOROLA |
| SNT-100-BK-T | Samtec | JP2 0 SNT-100-BK-T Shunt, .100cc, Optional SAMTEC |
| TSW-103-07-G-S | Samtec | JP2 1 TSW-103-07-G-S Jumper, 3-Pin, .100cc SAMTEC |
| 532956-5 | AMP | JP1 1 532956-5 Con., Recept, 30-Pin, 2-Row AMP |
| CR32-100J-T | AVX | R5 1 CR32-100J-T Res., SMT-1206, 10Ω, 5% AVX |
| CR32-101J-T | AVX | R3,R4 2 CR32-101J-T Res., SMT-1206, 100Ω, 5% AVX |
| 12065C104ZAT2A | AVX | C12 1 12065C104ZAT2A Cap., X7R, .1μF, 50V, 20% AVX |
| 12065C501MAT2A | AVX | C14 1 12065C501MAT2A Cap., X7R, 500pF, 50V, 20% AVX |
| CR32-333J-T | AVX | R6 1 CR32-333J-T Res., SMT-1206, 33kΩ, 5% AVX |
| 627V100 | BI Technologies | R1 1 627V100 Res., Network BI TECH |
| CTX3-6-52 | Coiltronics | L1 (Note 1) 1 CTX3-6-52 Inductor, Toroid, 3μH COILTRONICS |
| WSL-2512-0.015-1% | Dale | R2 1 WSL-2512-0.015-1% Res., SMT-2512, 0.015, 1W, 1% DALE |
| LT1431CS8 | Linear Technology | U2 1 LT1431CS8 I.C., SO8, LT1431, Prog Ref LTC |
| LTC1266CS16 | Linear Technology | U1 1 LTC1266CS16 I.C., SO16, LTC1266, Sw-Reg LTC |
| Si4410DY | Siliconix | Q1 1 Si4410DY Xistor, MOSFET, Si4410, SO-8 SILICONIX |
| Si9410DY | Siliconix | Q2 1 Si9410DY Xistor, MOSFET, Si9410, SO-8 SILICONIX |
| 51-656 | Gowanda Electronics | Note 1. Alternate source: Gowanda Electronics Part # 51-656. |
| 10V | AVX | *Assumes 6 each, 100μF, 10V, AVX type TPS tantalum capacitors or equivalent and 10 each, 1μF 1206 ceramics at the load. |
| 25V | AVX | C11,15 2 12063G105ZAT2A Cap., Y5V, 1μF, 25V AVX (803) 946-0362 |
| 2.0V | Maxim | amplifier output to its 2.0V maximum. In this configura- |