Dual Output DC/DC Converter Solutions for Xilinx FPGA Based Systems
Design solutions for Xilinx FPGA power supplies using LTC3407, LTC3736, and LTC3708 regulators to provide dual outputs with tracking and sequencing capabilities.
Overview
This design document outlines high-efficiency dual-output DC/DC converter solutions tailored for Xilinx FPGA families, including Virtex-II Pro, Virtex-II, and Spartan-3. It details three primary solutions based on load requirements: the LTC3407 for 600mA applications, the LTC3736 for 5A loads using 2-phase operation to minimize input ripple, and the LTC3708 for high-current 15A systems. The document addresses critical FPGA power design challenges such as core and I/O voltage requirements, supply sequencing, and ratiometric or coincident voltage tracking. Full schematics are provided featuring components from Murata, Taiyo Yuden, Vishay, Renesas, and Sanyo.
Use Cases
- Powering Xilinx FPGA core and I/O rails
- High-efficiency buck regulation for multi-rail systems
- Supply sequencing and tracking in digital systems
- Point-of-load regulation for high-current FPGA applications
- Reducing input capacitor RMS current in dual-output designs
Topics
Referenced Parts
LTC3407
Linear Technology
New dual output DC/DC regulators from Linear Technology, the LTC3407
LTC3708
Linear Technology
The LTC3708-based dual output supply is an ideal choice
LTC3736
Linear Technology
The LTC3736 is a 2-phase dual synchronous step down DC/DC controller.
ETQP3H
Panasonic
L1, L2: PANASONIC ETQP3H
HAT2165
Renesas
M3, M4: RENESAS HAT2165
HAT2168
Renesas
M1, M2: RENESAS HAT2168
2R5TPD470M
Sanyo
COUT2: SANYO POSCAP 2R5TPD470M
JMK316BJ106ML
Taiyo Yuden
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
IHLP2525CZ-01
Vishay Dale
L1 1.5μH IHLP2525CZ-01
Si7540DP
Vishay Siliconix
Q2A Si7540DP Q2B Si7540DP Q1A Si7540DP Q1B Si7540DP
B340A
Diodes Incorporated
D1 B340A D2 B340A
JMK316BJ106ML
Taiyo Yuden
AN95 F01 C1, C2, C3: TAIYO YUDEN JMK316BJ106ML L1, L2: MURATA LQH32CN2R2M33
| LQH32CN2R2M33 | Murata | L1, L2: MURATA LQH32CN2R2M33 |
| 4TPD330M | Sanyo | COUT1: SANYO POSCAP 4TPD330M |
| CMDSH-3 | Central Semiconductor | CMDSH-3 |
| LQH32CN2R2M33 | Murata | AN95 F01 C1, C2, C3: TAIYO YUDEN JMK316BJ106ML L1, L2: MURATA LQH32CN2R2M33 |
| LTC3407 | Linear Technology | New dual output DC/DC regulators from Linear Technology, the LTC3407 |
| LTC3708 | Linear Technology | The LTC3708-based dual output supply is an ideal choice |
| LTC3736 | Linear Technology | The LTC3736 is a 2-phase dual synchronous step down DC/DC controller. |
| ETQP3H | Panasonic | L1, L2: PANASONIC ETQP3H |
| HAT2165 | Renesas | M3, M4: RENESAS HAT2165 |
| HAT2168 | Renesas | M1, M2: RENESAS HAT2168 |
| 2R5TPD470M | Sanyo | COUT2: SANYO POSCAP 2R5TPD470M |
| JMK316BJ106ML | Taiyo Yuden | C1, C2, C3: TAIYO YUDEN JMK316BJ106ML |
| IHLP2525CZ-01 | Vishay Dale | L1 1.5μH IHLP2525CZ-01 |
| Si7540DP | Vishay Siliconix | Q2A Si7540DP Q2B Si7540DP Q1A Si7540DP Q1B Si7540DP |
| B340A | Diodes Incorporated | D1 B340A D2 B340A |
| JMK316BJ106ML | Taiyo Yuden | AN95 F01 C1, C2, C3: TAIYO YUDEN JMK316BJ106ML L1, L2: MURATA LQH32CN2R2M33 |