MIC5165YMM Evaluation Board Dual Regulator Controller for DDR3, GDDR3/4/5 Memory Termination Power Good Signal General Description The MIC5165 is a dual regulator controller for high-speed bus termination that offers a simple, low-cost JEDECcompliant solution for terminating high-speed, low-voltage digital buses (i.e., DDR, DDR2, DDR3, SCSI, GTL, SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc) and features a Power Good output (PG) and an Enable input (EN). The MIC5165 controls two external N-Channel MOSFETs to form a current source/sink circuit that responds adaptively for active high-speed bus termination. The output voltage VTT is programmed by external voltage VDDQ, where VTT = ½ VDDQ. The evaluation board includes a MIC5165YMM, and a MIC22950YML buck regulator that provides the 1.2V high current termination source. Data sheets and support documentation are found on the Micrel web site: www.micrel.com. Requirements The MIC5165YMM EV requires two input supply voltages and a test load. The input voltages are VIN of 3.0V to 5.5V (typically 5V, 5A minimum) to power the ICs and the termination bus, and a VDDQ supply of 0.75V to 6.0V from which the VTT regulation reference is derived. The load can be active (electronic load), or passive (resistor). Precautions There is no reverse input protection on this board, when connecting supplies and signals ensure that correct polarities are observed. Getting Started 1. VIN Supply With the Enable input (EN) connected to GND, connect the VIN supply (3.0V to 5.5V) across the VIN and GND terminals; typically, VIN = 5.0V. Monitor VIN at the test board input terminals with a voltmeter. VIN powers both the MIC22950 and the MIC5165. The MIC22950 steps down VIN to generate the 1.2V that the MIC5165 further regulates to VTT. 2. VDDQ Supply Connect the VDDQ supply (0.75V to 6.0V) across the VDDQ and GND terminals. Typically, VDDQ = 1.2V. The MIC5165 regulates VTT to ½VDDQ. 3. Output Load Connect the load across the VTT and GND terminals. Monitor VTT with a voltmeter at the VTT and GND terminals. 4. Enable the Circuit Release the enable input (EN is pulled up to VIN through a 1kΩ resistor). When the active high enable input EN is above 1.2V the output voltage VTT regulates to ½VDDQ. When EN is below 0.3V the MIC5165 is disabled and draws only microamps. Ordering Information Part Number Description MIC5165YMM EVB Evaluation Board for the MIC5165YMM Ramp Control is a trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2011 M9999-011411-A Micrel, Inc. MIC5165 Evaluation Board Evaluation Board Features MIC22950 Control and Monitor Signals Note: See the MIC22950YML datasheet for detailed explanations of these functions. MIC5165 Control and Monitor Signals Note: See the MIC5165YMM datasheet for detailed explanations of these functions. Enable/Delay (EN/DLY) Allows delayed turn on of the buck regulator. Increase the value of capacitor C13 to increase the start-up delay of the MIC22950. Enable (EN) The MIC5165 features an active high enable input, EN. Enable is pulled up to VIN through a 1kΩ resistor. With EN low, supply currents are reduced to microamperes. The enable input has thresholds compatible with TTL/CMOS for simple logic interfacing, with thresholds of 0.3V and 1.2V. Shutdown (SHDN) SHDN allows enable/disable of the buck regulator. SHDN is pulled to GND through a 100kΩ resistor. When SHDN is low the buck regulator operates normally. Force SHDN high to disable the buck regulator. Power Good (PG) MIC5165 features a Power Good (PG) output. PG is an open drain, active high signal, and is connected to VIN through a 10kΩ resistor. PG pulls low if VTT is more than 10% above or below ½VDDQ. Delay (DELAY) DELAY allows a delayed buck regulator Power Good (PG) indication. Install capacitor C11 to increase the Power Good delay timing of the MIC22950. DELAY also delays the ramp down of the MIC22950 output at turn-off. Ramp Control (RC) Ramp control allows slowing the slew rate of the MIC22950 output. Increase the value of capacitor C12 to reduce the slew rate. Power-On-Reset/Power Good (POR/PG) Open drain output POR/PG pulls low when the output voltage of the MIC22950 is out of specification. POR/PG is pulled up to VIN by a 47.5kΩ resistor. January 2011 2 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Typical Characteristics January 2011 3 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Evaluation Board Schematic MIC5165 as a DDR3 Memory Termination Device for 3.5A Application (VDDQ and MOSFET Input are Separate Supplies) January 2011 4 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Bill of Materials Item C1, C2, C3, C4 Part Number GRM21BR60J226ME39L 08056D226MAT2A (3) 06036D106MAT2A GRM1885C1H390JA01D C6 C7 C8 C9, C10 4 10µF, 6.3V, Ceramic Capacitor, X5R, 0603 1 (1) Murata TDK (2) (3) AVX Murata(1) (2) TDK 06035C101MAT2A AVX(3) GRM31CR60J476ME19L 22µF, 6.3V, Ceramic Capacitor, X5R, 0805 AVX C1608C0G1H390J GRM188R71H391KA01D Qty. Murata TDK(2) C1608X5R0J106M Description (1) C2012X5R0J226M GRM188R60J106ME47D C5 Manufacturer 39pF, 50V, Ceramic Capacitor, NPO, 0603 1 39pF, 25V, Ceramic Capacitor, NPO, 0603 (1) Murata 100pF, 50V, Ceramic Capacitor, X7R, 0603 1 390pF, 50V, Ceramic Capacitor, X7R, 0603 1 47µF, 6.3V, Ceramic Capacitor, X5R, 1206 2 (1) Murata C3216X5R0J476M TDK(2) 12066D476MAT2A (3) AVX C13 GRM188R71H102KA01D Murata(1) 1nF, 50V, Ceramic Capacitor, X7R, 0603 1 C14 GRM188R71H103KA01D Murata(1) 10nF, 50V, Ceramic Capacitor, X7R, 0603 1 1µF, 10V, Ceramic Capacitor, X5R, 0603 2 C22, C28 C23, C12 C27 C26 (3) 0603ZD105KAT2A AVX GRM188R61A105K Murata VJ0603A121JXACW1BC Vishay(4) 06033A121JAT2A VJ0603Y221KXACW1BC (1) 120pF, 25V, Ceramic Capacitor, NPO, 0603 Vishay(4) 220pF, 50V, Ceramic Capacitor, X7R, 0603 (3) 06033C221JAT2A AVX 220pF, 25V, Ceramic Capacitor, X7R, 0603 TCJB107M006R0070 AVX(3) 100µF, 6.3V, Tantalum Capacitor, 1210 C24, C11 1 1 N.U. (Not Used) 0603 Ceramic Capacitor C30, C32, C21 C4532X5R0J107M C31 Open (2SEPC2700M) CIN 2 AVX(3) EEE-FPA122UAP TDK(2) Sanyo(5) Panasonic (6) (7) L1 CDEP105ME-1R2MC Sumida Q1 2N7002E(SOT-23) Vishay(4) Q21, Q22 SUD50N02-06P Vishay (4) 100µF, 6.3V, Ceramic Capacitor, X5R, 1812 3 2700µF, 2.5V Oscon Capacitor 1 1200µF, 10V, Electrolytic Capacitor, SMD, 10x10.2-case 1 1.2µH, 21A, Inductor, 10.4mmX10.4mm 1 Signal MOSFET, SOT-23-6 1 Low VGS(th) N-Channel 20-V (D-S) 2 Notes: 1. Murata: www.murata.com. 2. TDK: www.tdk.com. 3. AVX: www.avx.com. 4. Vishay: www.vishay.com. 5. Sanyo: www.sanyo.com. 6. Panasonic.: www.panasonic.com. 7. Sumida: www.sumida.com. January 2011 5 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Bill of Materials (Continued) Item Part Number Manufacturer Description Qty. (4) 510Ω, Resistor, 1%, 0603 1 698Ω, Resistor, 1%, 0603 1 R1 CRCW0603510RFRT1 Vishay Dale R2 CRCW0603698RFRT1 Vishay Dale(4) CRCW06032002FRT1 Vishay Dale (4) 20K, Resistor, 1%, 0603 1 Vishay Dale (4) 47.5K, Resistor, 1%, 0603 1 (4) R3 R4 CRCW06034752FRT1 R5 CRCW06031003FRT1 Vishay Dale 100K, Resistor, 1%, 0603 1 R21 CRCW0805510RFKTA Vishay Dale(4) 510Ω, Resistor, 1%, 0805 1 R23, R24 CRCW06031K00FKTA Vishay Dale(4) 1K, Resistor, 1%, 0603 2 R22 CRCW06030000FKTA (4) Vishay Dale 0Ω, Resistor, 1%, 0603 1 R25 CRCW06031002FRT1 Vishay Dale(4) 10K, Resistor, 1%, 0603 1 U1 MIC22950YML Micrel(8) Buck Regulator 10A, 0.4MHz-2MHz Synchronous Buck Regulator 1 U2 MIC5165YMM Micrel(8) Dual Regulator Controller for DDR3 1 Note: 8. Micrel, Inc.: www.micrel.com. January 2011 6 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Evaluation Board PCB Layout Top Silk Top Layer January 2011 7 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Evaluation Board PCB Layout (Continued) Middle Layer 1 Middle Layer 2 January 2011 8 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board Evaluation Board PCB Layout (Continued) Bottom Silk Bottom Layer January 2011 9 M9999-011411-A Micrel, Inc. MIC5165YML Evaluation Board MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2011 Micrel, Incorporated. January 2011 10 M9999-011411-A