LP2995LQEVAL

User's Guide SNVA056B – August 2002 – Revised May 2013 AN-1241 LP2995 Evaluation Board 1 Introduction The LP2995 evaluation board is designed to provide the design engineer with a fully functional prototype system in which to evaluate the LP2995 in both a static environment and with a complete memory system. There are two versions of the board, while identical in functionality they differ in the package implemented, either an SO-8 or LLP-16 LP2995 is used. This document contains information regarding the evaluation board. For more information regarding the LP2995, see the device-specific data sheet. 2 Schematic The following schematic was used to create the layout. Figure 1. Schematic Table 1. Bill Of Materials (BOM) Name Value U1 Description Manufacturer Model Number LP2995 DDR Linear Regulator Texas Instruments LP2995M or LP2995LQ C1 0.1 µF 1206 Ceramic Capacitor X7R 25V Vishay Vitrammon VJ1206Y104KXXAT C2 330 µF 6.3 V Electrolytic Radial FC Series Panasonic EEU-FC0J331S C3 330 µF 6.3 V Electrolytic Radial FC Series Panasonic EEU-FC0J331S Panasonic EEU-FC0J680 C4 C5 Not Connected 68 µF 6.3 V Electrolytic Radial FC series All trademarks are the property of their respective owners. SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated AN-1241 LP2995 Evaluation Board 1 Application 3 www.ti.com Application The LP2995 evaluation board can be used immediately in either a static test environment to check functionality or in a memory termination scheme on a motherboard. In either implementation the following steps should be taken to ensure correct operation: 1. Connect leads from the evaluation board. The board layout has been designed to allow banana jack sockets to be directly soldered. 2. VIN should be connected to a 2.5 V power supply. This pad connects both the AVIN and PVIN pins of the LP2995. 3. Two GND pads have been provided for ease of use. Either is sufficient for grounding of the board. 4. The VDDQ input provides the internal divide by two reference voltage. Both VREF and VTT will track this internal voltage, nominally a 2.5V will be applied. 5. The VREFOUT pad is the output for the VREF from the LP2995 after being bypassed by a ceramic capacitor. This can be connected either to a multimeter for confirmation or directly to the memory controller and DIMMS. 6. The remaining two pads are for the force and sense leads of the VTT output. These should be connected directly to the termination plane or a multimeter if interested in verification. The output will be regulated where the VSENSE leads connect to the VTT leads permitting the connection to a motherboard without suffering from large resistance drops. 2 AN-1241 LP2995 Evaluation Board SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Performance www.ti.com 4 Performance The following series of scope plots shows the performance of the LP2995 evaluation board when it is subjected to various load tests. On each of the six scope plots there are two traces. The upper trace is the VTT output voltage that has been AC coupled with a scale of 20 mV per division. The lower trace is the output current with a scale of 500 mA per division. All the load transients begin from an initial condition of zero current and show magnitude. Please refer to the title to determine whether the current flow is into (sinking) or out of (sourcing) the VTT pin. The time scale for all the plots is 2mS per division. 0.5A Load Transient (Sourcing) 1A Load Transient (Sourcing) 1.5A Load Transient (Sourcing) 0.5A Load Transient (Sinking) 1A Load Transient (Sinking) 1.5A Load Transient (Sinking) SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated AN-1241 LP2995 Evaluation Board 3 Board Layout www.ti.com The LP2995 has been designed to accommodate several different capacitor options to allow the designer to optimize the solution for the specific application. For most desktop systems large aluminum electrolytic capacitors will be used for their low cost. However, in height limited situations such as laptops fewer high performance capacitors might be implemented such as specialty polymers. The table below lists some of the capacitors that can be used and a vendor that offers that product line. Capacitor Series 5 Vendor Vendor Phone Number Oscon Vishay (207) 324-4140 SP Panasonic (714) 373-7857 MLCC Taiyo Yuden (800)-348-2496 Aluminum Panasonic (714) 373-7857 Board Layout Figure 2. LLP Top Side 4 AN-1241 LP2995 Evaluation Board SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Board Layout www.ti.com Figure 3. LLP Bottom Side Figure 4. SO-8 Top Side SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated AN-1241 LP2995 Evaluation Board 5 Board Layout www.ti.com Figure 5. SO-8 Bottom Side 6 AN-1241 LP2995 Evaluation Board SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Board Layout www.ti.com Information SO-8 Board Board Material Size Board Thickness Layers Copper Thickness Plating Thermal Vias Thermal Vias Size Board Thickness LLP-16 Board FR4 FR4 0.9 x 1.1 inches 0.9 x 1.1 inches 0.062 inch 0.062 inch 2 2 1 oz 1 oz HASL HASL 3 6 25 mil 10 mil 0.062 inch 0.062 inch SNVA056B – August 2002 – Revised May 2013 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated AN-1241 LP2995 Evaluation Board 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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