MIC5167YML EV Evaluation Board 1MHz, 6A Integrated Switch HighEfficiency Synchronous Buck DDR Memory Terminator General Description The MIC5167 high-efficiency, 6A, integrated switch, synchronous buck (step-down) regulator for double data rate (DDR) or quad data rate (QDR) termination achieves more than 94% efficiency. The ultra-high speed control loop keeps the output voltage in regulation under the extreme transient load swings commonly found in high speed memories. The output voltage VTT regulates to one-half the voltage applied to the VDDQ input, and is adjustable down to 0.6V. The active high open-drain Power Good output (PG) pulls low when the output voltage is not within ±15% of VREF. The MIC5167 sources/sinks up to ±6A, switches at 1MHz, and typically uses a small 0.4µH inductor and 300µF of output capacitance. The MIC5167 is available in a 24-pin 4mm x 4mm MLF® and operates over the –40°C to +125°C temperature range. Data sheets and support documentation are found on the Micrel web site: www.micrel.com. Requirements The MIC5167YML EV requires a power supply of 2.6V to 5.5V, and a test load. Ensure that the power supply can provide the wattage required for the chosen test load. The load can be active (electronic load) or passive (resistor). Additionally, monitor the Power Good output with a multimeter or an oscilloscope if desired. 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 Supplies Connect the VIN supply (2.6V to 5.5V) across the PVIN and PGND terminals. Monitor VIN at the PVIN and PGND terminals with a voltmeter. Connect a VDDQ supply (0.7V to 1.8V) to the VDDQ input (VDDQ is connected to an internal precision divider that provides the reference voltage VREF). 2. Enable and Shutdown Inputs The enable input EN is internally pulled up with a 1µA current source. When external on/off control is desired connect a logic level control signal to the SHDN input. When SHDN is high the output is off, when SHDN is low the output is on. When not externally driven, SHDN is pulled low by 10kΩ resistor R3 forcing the output on. 3. Monitor Outputs Monitor the output VOUT with a scope or DVM connected across the VOUT and GND terminals. 4. Output Load Connect a load across the VOUT and GND terminals. Use an active or passive load. Turn On the Power Turn on the power supplies and verify that VOUT = 0.6V. Ordering Information Part Number Description MIC5167YML EV Evaluation Board for the MIC5167YML MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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 February 2011 M9999-020411-A Micrel, Inc. MIC5167 Evaluation Board Power Good Output (PG) Active high open-drain output PG pulls low when the output voltage of the MIC5167 is not within ±15% of VREF (where VREF = ½VDDQ). PG is pulled up to VIN by 10kΩ resistor R1. PG also pulls low when the enable input EN is low. EV Board Features See the MIC5167YML datasheet for detailed explanations of these functions. Enable/Delay (EN/DLY) Enable/Delay allows delayed turn on of the MIC5167. Increase the value of capacitor C6 to increase the start-up delay of the MIC5167. Switch Voltage (VSW) Test point VSW is provided to monitor the internal switching node. Shutdown Input (SHDN) SHDN allows enable/disable of the MIC5167 with an external logic signal. Force SHDN high to disable the MIC5167, and low to allow the MIC5167 to operate normally. February 2011 2 M9999-020411-A Micrel, Inc. MIC5167 Evaluation Board Typical Characteristics Efficiency (VIN = 3.3V) vs. Output Current 95 Efficiency (VIN = 5.0V) vs. Output Current 95 90 VTT 1.8V 1.6V 1.4V 1.2V 85 80 1.0V 0.9V 0.8V VIN = 3.3V 75 EFFICIENCY (%) EFFICIENCY (%) 90 70 0 1 2 3 4 5 6 7 80 V IN = 5.0V 0.6V 70 8 0 OUTPUT CURRENT (A) February 2011 85 75 0.6V V TT 1.8V 1.6V 1.4V 1.2V 1.0V 0.9V 0.8V 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 3 M9999-020411-A Micrel, Inc. MIC5167 Evaluation Board February 2011 20 SW PGND 24 21 SW PGND 19 22 SW PGND 12 7 PGND SW 23 Evaluation Board Schematic 4 M9999-020411-A Micrel, Inc. MIC5167 Evaluation Board Bill of Materials Item Part Number Manufacturer C1, C2, C3, C4, C5 C2012X5R0J226M TDK 08056D226MAT AVX GRM21BR60J226ME39L Murata VJ0603A102KXA Vishay 1000pF/50V Ceramic Capacitor, COG, 0603 GRM188R71H102KA01D Murata 1000pF/50V Ceramic Capacitor, X7R, 0603 C1608C0G1H102J TDK 1000pF/50V Ceramic Capacitor, COG, 0603 C7 C1608C0G1H104K TDK 0.1µF/50V Ceramic Capacitor, X7R, 0603 1 C8 C0603X5R1H101M TDK 100pF/50V Ceramic Capacitor, X5R, 0603 1 C6 Description Qty. 22µF/6.3V Ceramic Capacitor, X5R, 0805 5 1 C9 C1005COG1H470J TDK 47pF/50V Ceramic Capacitor, COG, 0402 1 C10, C11, C12 JMK316BJ107ML-T Taiyo Yuden 100µF/6.3V Ceramic Capacitor, X5R, 1206 3 CIN B41125A3477M000 Epcos 470µF/10V Electrolytic Capacitor, 8x10 1 L1 HCP0704-0R4-R Coiltronics 0.4µH, 12A, size 6.8x6.8x4.2mm 1 R1, R3 CRCW060310K0FKEA Vishay Dale 10.0kΩ Resistor, 0603, 1% 2 R2 CRCW06031K00FKEA Vishay Dale 1.00kΩ Resistor, 0603, 1% 1 Q1 CMDPM7002A Central Semiconductor Signal MOSFET, SOT-23-6 1 U1 MIC5167YML Micrel, Inc. Integrated 6A DDR Regulator 1 Notes: 1. TDK: www.tdk.com 2. AVX: www.avx.com 3. Murata: www.murata.com 4. Vishay: www.vishay.com 5. BC Components: www.bccomponents.com 6. Coiltronics: www.coiltronics.com 7. Central Semiconductor: www.centralsemi.com 8. Micrel, Inc.: www.micrel.com February 2011 5 M9999-020411-A Micrel, Inc. MIC5167YML Evaluation Board Evaluation Board PCB Layout MIC5167 Evaluation Board Top Silk MIC5167 Evaluation Board Top Layer February 2011 6 M9999-020411-A Micrel, Inc. MIC5167YML Evaluation Board MIC5167 Evaluation Board Mid-Layer 1 (Ground Plane) MIC5167 Evaluation Board Mid-Layer 2 February 2011 7 M9999-020411-A Micrel, Inc. MIC5167YML Evaluation Board MIC5167 Evaluation Board Bottom Layer 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. © 2010 Micrel, Incorporated. February 2011 8 M9999-020411-A