MIC5162 Dual Regulator Controller for DDR3 GDDR3/4/5 Memory and High-Speed Bus Termination General Description Features The MIC5162 is a dual regulator controller designed for * Input voltage range: 1.35V to 6V high speed bus termination. It offers a simple, low-cost * Up to 7A VTT Current JEDEC compliant solution for terminating high-speed, low* Tracking programmable output voltage digital buses (i.e. DDR, DDR2, DDR3, SCSI, GTL, * Wide bandwidth SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc). * Logic controlled enable input The MIC5162 controls two external N-Channel MOSFETs * Requires minimal external components to form two separate regulators. It operates by switching between either the high-side MOSFET or the low-side * DDR, DDR2, DDR3, memory termination MOSFET depending upon whether the current is being * -40C < TJ < +125C sourced to the load or sunk by the regulator. * JEDEC Compliant Bus Termination for SCSI, GTL, Designed to provide a universal solution for bus SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc termination regardless of input voltage, output voltage, or * Tiny MSOP-10 package load current. The desired MIC5162 output voltage can be programmed by forcing the reference voltage externally to desired voltage. Applications The MIC5162 operates from an input of 1.35V to 6V, with * Desktop Computers a second bias supply input required for operation. It is * Notebook computers available in a tiny MSOP-10 package with operating * Communication systems junction temperature range of -40C to +125C. * Video cards Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com. * DDR/DDR2/DDR3 memory termination ____________________________________________________________________________________________________________ Typical Application Typical SSTL-2 Application (Two MOSFETs Support a 3.5A Application) Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com March 2010 M9999-033110 Micrel, Inc. MIC5162 Ordering Information Part Number Temperature Range Package Lead Finish MIC5162YMM -40 to +125C 10-Pin MSOP Pb-Free Note: MSOP is a Green RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 10-Pin MSOP (MM) Pin Description Pin Number Pin Name 1 VCC 2 EN 3 VDDQ Input Supply Voltage. 4 VREF Reference voltage equal to half of VDDQ. For internal use only. 5 GND Ground. 6 FB 7 COMP Pin Function Bias Supply Input. Apply 3V-6V to this input for internal bias to the controller. Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. The enable pin can be tied directly to VDDQ or VCC for functionality. Do not float the enable pin. Floating this pin causes the enable to be in an undetermined state. Feedback input to the internal error amplifier. Compensation (Output): Connect a capacitor and resistor from COMP pin to feedback pin for compensation of the internal control loop. 8 LD Low-side drive: Connects to the Gate of the external low-side MOSFET. 9 HD High-side drive: Connects to the Gate of the external high-side MOSFET. 10 NC Not internally connected. March 2010 2 M9999-033110 Micrel, Inc. MIC5162 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC) ....................................... -0.3V to +7V Supply Voltage (VDDQ) ..................................... -0.3V to +7V Enable Input Voltage (VEN).................... -0.3V to (VIN+0.3V) Junction Temperature Range (TJ)...... -40C < TJ < +125C Lead Temperature (Soldering 10sec.) ....................... 260C Storage Temperature (TS)......................... -65C to +150C (3) ESD Rating ................................................................ +2kV Supply Voltage (VCC).............................................. 3V to 6V Supply Voltage (VDDQ) ....................................... 1.35V to 6V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Thermal Resistance MSOP-10 (JA)..............................................130.5C/W MSOP-10 (JC)................................................42.6C/W Electrical Characteristics(4) TA = 25C with VDDQ = 2.5V; VCC = 5V, VEN = VCC, bold values indicate -40C TJ +125C, unless otherwise specified. See test circuit 1 for test circuit configuration. Parameter Condition Min Typ Max Units -1% 0.5VDDQ +1% V Sourcing; 100mA to 3A -5 -10 0.4 +5 +10 mV mV Sinking; -100mA to -3A -5 -10 0.6 +5 +10 mV mV VREF Voltage Accuracy VTT Voltage Accuracy (Note 5) Supply Current (IDDQ) VEN = 1.2V (controller ON) No Load 120 140 200 A A Supply Current (ICC) No Load 15 20 25 mA mA ICC Shutdown Current (Note 6) VEN = 0.2V (controller OFF) 10 35 A Start-up Time (Note 7) VCC = 5V external bias; VEN = VIN 8 15 30 s s Enable Input Enable Input Threshold 1.2 Regulator Enable 0.3 Regulator Shutdown Enable Hysteresis Enable Pin Input Current V V 40 mV VIL < 0.2V (controller shutdown) 0.01 A VIH > 1.2V (controller enable) 5.5 A 4.97 V Driver High Side Gate Drive Voltage Low Side Gate Drive Voltage High Side MOSFET Fully ON 4.8 High Side MOSFET Fully OFF Low Side MOSFET Fully ON 0.03 4.8 Low Side MOSFET Fully OFF 0.2 4.97 0.03 V V 0.2 V Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model 1.5k in series with 100pF. 4. Specification for packaged product only. 5. The VTT voltage accuracy is measured as a delta voltage from the reference output (VTT - VREF). 6. Shutdown current is measured only on the VCC pin. The VDDQ pin will always draw a minimum amount of current when voltage is applied. 7. Start-up time is defined as the amount of time from EN = VCC to HSD = 90% of VCC. March 2010 3 M9999-033110 Micrel, Inc. MIC5162 Test Circuit March 2010 4 M9999-033110 Micrel, Inc. MIC5162 Typical Characteristics 10 8 3 6 1 0 -1 -2 4 2 0 -2 -4 -6 -3 -8 SINK 3A -10 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) -4 -2 -1 0 1 2 OUTPUT CURRENT (A) 1.2625 3 VREF vs. Temperature 1.2600 VDDQ = 2.5V 1.2575 VREF (V) 1.2550 1.2525 1.2500 1.2475 1.2450 1.2425 1.2400 1.2375 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) March 2010 18 SOURCE CURRENT (mA) -5 -3 10 8 ICC Current vs. VCC 14 12 10 8 6 4 2 0 0 1 2 3 4 5 INPUT VOLTAGE (V) 5 6 4 2 0 -2 -4 -6 20 16 6 [V TT - V REF ] vs. Temperaute -8 SOURCE 3A -10 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) SOURCE CURRENT (mA) 2 [V TT - V REF ] vs. Temperature [VTT - VREF] (mV) 4 [VTT - VREF] (mV) [VTT - VREF] (mV) 5 [V TT - V REF ] vs. Output Current ICC Current vs. Temperature 18 16 14 12 10 8 6 4 2 VCC = 5V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) M9999-033110 Micrel, Inc. MIC5162 Functional Diagram March 2010 6 M9999-033110 Micrel, Inc. MIC5162 VDDQ The VDDQ pin on the MIC5162 provides the source current through the high-side N-Channel and the reference voltage to the device. The MIC5162 can operate at VDDQ voltages as low as 1.35V. Due to the possibility of large transient currents being sourced from this line, significant bypass capacitance will aid in performance by improving the source impedance at higher frequencies. Since the reference is simply VDDQ/2, perturbations on the VDDQ will also appear at half the amplitude on the reference. For this reason, low ESR capacitors such as ceramics or OS-CON are recommended on VDDQ. Application Information High performance memory requires high speed signaling. This means special attention must be paid to maintain signal integrity. Bus termination provides a means to increase signaling speed while maintaining good signal integrity. An example of bus termination is the Series Stub Termination Logic or SSTL. Figure 1 is an example of an SSTL 2 single ended series parallel terminated output. SSTL 2 is a JEDEC signaling standard operating off a 2.5V supply. It consists of a series resistor (RS) and a terminating resistor (RT). Values of RS range between 10 to 30 with a typical of 22, while RT ranges from 22 to 28 with a typical value of 25. VREF must maintain 1/2 VDD with a 1% tolerance, while VTT will dynamically sink and source current to maintain a termination voltage of 40mV from the VREF line under all conditions. This method of bus termination reduces common mode noise, settling time, voltage swings, EMI/RFI and improves slew rates. The MIC5162 is a high performance linear controller, utilizing scalable N-Channel MOSFETs to provide JEDEC-compliant bus termination. Termination is achieved by dividing down the VDDQ voltage by half, providing the reference (VREF) voltage. An internal error amplifier compares the termination voltage (VTT) and VREF, controlling 2 external N-Channel MOSFETs to sink and source current to maintain a termination voltage (VTT) equal to VREF. The N-Channels receive their enhancement voltage from a separate VCC pin on the device. Although this document focuses mostly on SSTL, the MIC5162 is also capable of providing bus terminations for SCSI, GTL, HSTL, LV-TTL, Rambus, LV-PECL, DDR, DDR2, DDR3 memory termination and other systems. VTT VTT is the actual termination point. VTT is regulated to VREF. Due to high speed signaling, the load current seen by VTT is constantly changing. To maintain adequate large signal transient response, large OS-CON and ceramics are recommended on VTT. The proper combination and placement of the OS-CON and ceramic capacitors is important to reduce both ESR and ESL such that high-current and high-speed transients do not exceed the dynamic voltage tolerance requirement of VTT. The larger OS-CON capacitors provide bulk charge storage while the smaller ceramic capacitors provide current during the fast edges of the bus transition. Using several smaller ceramic capacitors distributed near the termination resistors is typically important to reduce the effects of PCB trace inductance. VREF Two resistors dividing down the VDDQ voltage provide VREF (Figure 3). The resistors are valued at around 17k. A minimum capacitor value of 120pF from VREF to ground is required to remove high frequency signals reflected from the source. Large capacitance values (>1500pF) should be avoided. Values greater than 1500pF slow down VREF and detract from the reference voltage's ability to track VDDQ during high speed load transients. Figure 1. SSTL-2 Termination Figure 2. MIC5162 as a DDR Memory Termination for 3.5A Application March 2010 7 M9999-033110 Micrel, Inc. MIC5162 Input Capacitance Although the MIC5162 does not require an input capacitor for stability, using one greatly improves device performance. Due to the high-speed nature of the MIC5162, low ESR capacitors such as OS-CON and ceramics are recommended for bypassing the input. The recommended value of capacitance will depend greatly upon proximity to the bulk capacitance. Although a 10F ceramic capacitor will suffice for most applications, input capacitance may need to be increased in cases where the termination circuit is greater than 1 inch away from the bulk capacitance. Figure 3. VREF Follows VDDQ VREF can also be manipulated for different applications. A separate voltage source can be used to externally set the reference point, bypassing the divider network. Also, external resistors can be added from VREF-to-VDDQ or VREF-to-ground to shift the reference point up or down. Output Capacitance Large, low ESR capacitors are recommended for the output (VTT) of the MIC5162. Although low ESR capacitors are not required for stability, they are recommended to reduce the effects of high-speed current transients on VTT. The change in voltage during the transient condition will be the effect of the peak current multiplied by the output capacitor's ESR. For that reason, OS-CON type capacitors are excellent for this application. They have extremely low ESR and large capacitance-to-size ratio. Ceramic capacitors are also well suited to termination due to their low ESR. These capacitors should have a dielectric rating of X5R or X7R. Y5V and Z5U type capacitors are not recommended, due to their poor performance at high frequencies and over temperature. The minimum recommended capacitance for a 3 Amp peak circuit is 100F. Output capacitance can be increased to achieve greater transient performance. VCC VCC supplies the internal circuitry of the MIC5162 and provides the drive voltage to enhance the external NChannel MOSFETs. A 1F ceramic capacitor is recommended for bypassing the VCC pin. The minimum VCC voltage should be a gate-source voltage above VTT or greater than 3V without exceeding 6V. For example, on an SSTL compliant terminator, VDDQ equals 2.5V and VTT equals 1.25V. If the N-Channel MOSFET selected requires a gate source voltage of 2.5V, VCC should be a minimum of 3.75V. Feedback and Compensation The feedback provides the path for the error amplifier to regulate VTT. An external resistor must be placed between the feedback and VTT. This allows the error amplifier to be correctly externally compensated. The COMP pin on the MIC5162 is the output of the internal error amplifier. By placing a capacitor between the COMP pin and the feedback pin, this coupled with the feedback resistor places an external pole on the error amplifier. With a 1k or 510 feedback resistor, a minimum 220pF capacitor is recommended for a 3.5A peak termination circuit. Increases in load, multiple NChannel MOSFETs and/or increase in output capacitance may require feedback and/or compensation capacitor values to be increased to maintain stability. Feedback resistor values should not exceed 10k and compensation capacitors should not be less than 40pF. MOSFET Selection The MIC5162 utilizes external N-Channel MOSFETs to sink and source current. MOSFET selection will settle to two main categories: size and gate threshold (VGS). MOSFET Power Requirements One of the most important factors is to determine the amount of power the MOSFET required to dissipate. Power dissipation in an SSTL circuit will be identical for both the high-side and low-side MOSFETs. Since the supply voltage is divided by half to supply VTT, both MOSFETs have the same voltage dropped across them. They are also required to be able to sink and source the same amount of current (for either all 0s or all 1s). This equates to each side being able to dissipate the same amount of power. Power dissipation calculation for the high-side driver is as follows: Enable The MIC5162 features an active-high enable (EN) input. In the off-mode state, leakage currents are reduced to microamperes. EN has thresholds compatible with TTL/CMOS for simple logic interfacing. EN can be tied directly to VDDQ or VCC for functionality. Do not float the EN pin. Floating this pin causes the enable circuitry to be in an undetermined state. March 2010 PD = (VDDQ - VTT) x I_SOURCE where I_SOURCE is the average source current. Power dissipation for the low-side MOSFET is as follows: PD = VTT x I_SINK 8 M9999-033110 Micrel, Inc. MIC5162 where I_SINK is the average sink current. In a typical 3A peak SSTL_2 circuit, power considerations for MOSFET selection would occur as follows. JA = 32.5C / W This shows that our total thermal resistance must be better than 32.5C/W. Since the total thermal resistance is a combination of all the individual thermal resistances, the amount of heat sink required can be calculated as follows: PD = (VDDQ -VTT) x I_SOURCE PD = (2.5V -1.25V) x 1.6A SA = JA - (JC + CS) In this example: PD = 2W This typical SSTL_2 application would require both highside and low-side N-Channel MOSFETs to be able to handle 2 Watts each. In applications where there is excessive power dissipation, multiple N-Channel MOSFETs may be placed in parallel. These MOSFETs will share current, distributing power dissipation across each device. The maximum MOSFET die (junction) temperature limits maximum power dissipation. The ability of the device to dissipate heat away from the junction is specified by the junction-to-ambient (JA) thermal resistance. This is the sum of junction-to-case (JC) thermal resistance, caseto-sink (CS) thermal resistance and sink-to-ambient (SA) thermal resistance; SA = 32.5C / W - (1.5C / W + 0.5C ) SA = 30 . 5 C / W In most cases, case-to-sink thermal resistance can be assumed to be about 0.5C/W. The SSTL termination circuit for this example, using 2 Dpack N-Channel MOSFETs (one high side and one on the low side) will require at least a 30.5C/W heat sink per MOSFET. This may be accomplished with an external heat sink or even just the copper area that the MOSFET is soldered to. In some cases, airflow may also be required to reduce thermal resistance. MOSFET Gate Threshold N-Channel MOSFETs require an enhancement voltage greater than its source voltage. Typical N-Channel MOSFETs have a gate-source threshold (VGS) of 1.8V and higher. Since the source of the high side N-Channel is connected to VTT, the MIC5162 VCC pin requires a voltage greater than the VGS voltage. For example, the SSTL_2 termination circuit has a VTT voltage of 1.25V. For an N-Channel that has a VGS rating of 2.5V, the VCC voltage can be as low as 3.75V, but not less than 3.0V. With an N-Channel that has a 4.5V VGS, the minimum VCC required is 5.75V. Although these N-Channels are driven below their full enhancement threshold, it is recommended that the VCC voltage has enough margin to be able to fully enhance the MOSFETs for large signal transient response. In addition, low gate thresholds MOSFETs are recommended to reduce the VCC requirements. JA = JC + CS + SA In the example of a 3A peak SSTL_2 termination circuit, a D-pack N-Channel MOSFET that has a maximum junction temperature of 125C has been selected. The device has a junction-to-case thermal resistance of 1.5C/Watt. The application has a maximum ambient temperature of 60C. The required junction-to-ambient thermal resistance can be calculated as follows: JA = TJ - T A PD Where TJ is the maximum junction temperature, TA is the maximum ambient temperature and PD is the power dissipation. In this example: JA = TJ - T A PD JA = 125C - 60C 2W March 2010 9 M9999-033110 Micrel, Inc. MIC5162 VIN or VDDQ SUD50N02-06P MIC5162YMM VDDQ=1.35V to 6.0V VDDQ HD VCC VCC=5.0V VTT=1/2VDDQ SUD50N02-06P 1k LD EN COMP EN + 100F 100F + 1k 100F 100F 220pF 1F FB VREF 1k GND 120pF Figure 4. DDR2 Termination (Four MOSFETs Support up to 7A) SSTL-2 Application (Two MOSFETs Support up to 3.5A) March 2010 10 M9999-033110 Micrel, Inc. MIC5162 Ripple Measurements To properly measure ripple on either input or output of a switching regulator, a proper ring in tip measurement is required. Standard oscilloscope probes come with a grounding clip, or a long wire with an alligator clip. Unfortunately, for high frequency measurements, this ground clip can pick up high frequency noise and erroneously inject it into the measured output ripple. The standard evaluation board accommodates a home made version by providing probe points for both the input and output supplies and their respective grounds. This requires the removing of the oscilloscope probe sheath and ground clip from a standard oscilloscope probe and wrapping a non-shielded bus wire around the oscilloscope probe. If there does not happen to be any non-shielded bus wire immediately available, the leads from axial resistors will work. By maintaining the shortest possible ground lengths on the oscilloscope probe, true ripple measurements can be obtained. Figure 5. Low Noise Measurement March 2010 11 M9999-033110 Micrel, Inc. MIC5162 PCB Layout Guideline Warning!!! To minimize EMI and output noise, follow these layout recommendations. PCB Layout is critical to achieve reliable, stable and efficient performance. A ground plane is required to control EMI and minimize the inductance in power, signal and return paths. The following guidelines should be followed to insure proper operation of the MIC5162 controller application. Output Capacitor IC and MOSFET * Place the IC close to the point of load (POL). * The trace connecting controller drive pins to MOSFETs gates should be short and wide to avoid oscillations. These oscillations are the result of tank circuit formed by trace inductance and gate capacitance. * Use fat traces to route the input and output power lines. * Signal and power grounds should be kept separate and connected at only one location. * Use a wide trace to connect the output capacitor ground terminal to the input capacitor ground terminal. * Phase margin will change as the output capacitor value and ESR changes. Contact the factory if the output capacitor is different from what is shown in the BOM. * The feedback trace should be separate from the power trace and connected as close as possible to the output capacitor. Sensing a long high current load trace can degrade the DC load regulation. Input Capacitor * Place the input capacitor next. * Place the input capacitors on the same side of the board and as close to the MOSFET and IC as possible. * Place a ceramic bypass capacitor next to MOSFET. * Keep both the VDDQ and GND connections short. * Place several vias to the ground plane close to the input capacitor ground terminal, but not between the input capacitors and MOSFET. * Use either X7R or X5R dielectric input capacitors. Do not use Y5V or Z5U type capacitors. * Do not replace the ceramic input capacitor with any other type of capacitor. Any type of capacitor can be placed in parallel with the input capacitor. * If a Tantalum input capacitor is placed in parallel with the input capacitor, it must be recommended for switching regulator applications and the operating voltage must be derated by 50%. * In "Hot-Plug" applications, a Tantalum or Electrolytic bypass capacitor must be used to limit the overvoltage spike seen on the input supply with power is suddenly applied. March 2010 12 M9999-033110 Micrel, Inc. MIC5162 Design Example Micrel's MIC5162 as a DDR3 Memory Termination Device for 3.5A Application (VDDQ and MOSFET Input Tied Together) Bill of Materials Item Part Number GRM21BR60J226ME39L C1, C2, C3, C4 C2012X5R0J226M 08056D226MAT2A GRM188R60J106ME47D C5 C1608X5R0J106M 06036D106MAT2A C6 C7 C8 C9, C10 GRM1885C1H390JA01D C14 C22 C23, C12 C27 C26 C24, C11 March 2010 Murata TDK TDK Murata (1) 1 39pF, 25V, Ceramic capacitor, NPO, 0603 (3) 100pF, 50V, Ceramic capacitor, X7R, 0603 1 390pF, 50V, Ceramic capacitor, X7R, 0603 1 47F, 6.3V, Ceramic capacitor, X5R, 1206 2 Murata Murata (1) TDK 39pF, 50V, Ceramic capacitor, NPO, 0603 (2) GRM31CR60J476ME19L (2) (3) AVX Murata (1) 1nF, 50V, Ceramic capacitor, X7R, 0603 1 Murata (1) 10nF, 50V, Ceramic capacitor, X7R, 0603 1 (3) AVX GRM188R61A105K Murata VJ0603A121JXACW1BC Vishay VJ0603Y221KXACW1BC 1 AVX GRM188R71H391KA01D 06033A121JAT2A 10F, 6.3V, Ceramic capacitor, X5R, 0603 (3) (1) 0603ZD105KAT2A 4 (1) (2) AVX GRM188R71H103KA01D 22F, 6.3V, Ceramic capacitor, X5R, 0805 AVX Murata 06035C101MAT2A GRM188R71H102KA01D Qty. (3) TDK C3216X5R0J476M Description (1) (2) C1608C0G1H390J 12066D476MAT2A C13 Manufacturer (1) 1F, 10V, Ceramic capacitor, X5R, 0603 (4) (3) AVX (4) Vishay 120pF, 25V, Ceramic capacitor, NPO, 0603 220pF, 50V, Ceramic capacitor, X7R, 0603 (3) 220pF, 25V, Ceramic capacitor, X7R, 0603 (3) 100F, 6.3V, Tantalum capacitor, 1210 06033C221JAT2A AVX TCJB107M006R0070 AVX 1 2 1 1 N.U. 0603 ceramic cap 13 M9999-033110 Micrel, Inc. MIC5162 Item Part Number C30, C32, C21 C4532X5R0J107M C31 Open (2SEPC2700M) CIN EEE-FPA122UAP Manufacturer TDK (2) Sanyo (5) Panasonic CRCW0603698RFRT1 1 1.2H, 21A, Inductor, 10.4mmX10.4mm 1 Signal MOSFET, SOT-23-6 1 Vishay R2 2700F, 2.5V OS-CON Cap (4) Sumida 2N7002E(SOT-23) CRCW0603820RFRT1 3 1 CDEP105ME-1R2MC R1 100F, 6.3V, Ceramic capacitor, X5R, 1812 1200F, 10V, Electrolytic capacitor, SMD, 10x10.2-case Q1 SUD50N02-06P Qty. (6) L1 Q21, Q22 (8) Description (4) Vishay Low VGS(th) N-Channel 20-V (D-S) 2 Vishay Dale (4) 820, Resistor, 1%, 0603 1 Vishay Dale (4) 698, Resistor, 1%, 0603 1 R3 CRCW06032002FRT1 Vishay Dale (4) 20K, Resistor, 1%, 0603 1 R4 CRCW06034752FRT1 Vishay Dale (4) 47.5K, Resistor, 1%, 0603 1 Vishay Dale (4) 100K, Resistor, 1%, 0603 1 R5 CRCW06031003FRT1 R21 CRCW0805510RFKTA Vishay Dale (4) 510, Resistor, 1%, 0805 1 R23, R24 CRCW06031K00FKTA Vishay Dale (4) 1K, Resistor, 1%, 0603 2 (4) R22 CRCW06030000FKTA Vishay Dale 0, Resistor, 1%, 0603 1 (7) Buck Regulator 10A, 0.4MHz-2MHz Synchronous Buck Regulator 1 (7) Dual Regulator Controller for DDR3 1 U1 MIC22950YML Micrel U21 MIC5162YMM Micrel 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. Sumida: www.sumida.com 7. Micrel, Inc.: www.micrel.com. 8. Panasonic.: www.panasonic.com March 2010 14 M9999-033110 Micrel, Inc. MIC5162 PCB Layout Recommendations (VDDQ and MOSFET Input Tied Together) Top Layer Top Component Layer March 2010 15 M9999-033110 Micrel, Inc. MIC5162 Middle Layer 1 Middle Layer 2 March 2010 16 M9999-033110 Micrel, Inc. MIC5162 Bottom Layer March 2010 17 M9999-033110 Micrel, Inc. MIC5162 Design Example Micrel's MIC5162 as a DDR3 Memory Termination Device for 3.5A Application (VDDQ and MOSFET Input Separated) Bill of Materials Item Part Number GRM21BR60J226ME39L C1, C2, C3, C4 C2012X5R0J226M 08056D226MAT2A GRM188R60J106ME47D C5 C6 C7 C8 C13 C14 C22, C28 C23, C12 C27 C26 C24, C11 March 2010 Murata TDK Murata Murata 1 390pF, 50V, Ceramic capacitor, X7R, 0603 1 47F, 6.3V, Ceramic capacitor, X5R, 1206 2 Murata Murata (1) (2) 12066D476MAT2A AVX (3) Murata (1) 1nF, 50V, Ceramic capacitor, X7R, 0603 1 Murata (1) 10nF, 50V, Ceramic capacitor, X7R, 0603 1 (3) AVX GRM188R61A105K Murata VJ0603A121JXACW1BC Vishay TCJB107M006R0070 1 100pF, 50V, Ceramic capacitor, X7R, 0603 (1) TDK 06033C221JAT2A 39pF, 50V, Ceramic capacitor, NPO, 0603 39pF, 25V, Ceramic capacitor, NPO, 0603 C3216X5R0J476M VJ0603Y221KXACW1BC (1) (3) TDK AVX 06033A121JAT2A 1 (2) C1608C0G1H390J 0603ZD105KAT2A 10F, 6.3V, Ceramic capacitor, X5R, 0603 (3) 06035C101MAT2A GRM188R71H103KA01D 4 (1) (2) TDK GRM188R71H102KA01D 22F, 6.3V, Ceramic capacitor, X5R, 0805 AVX AVX GRM188R71H391KA01D Qty. (3) C1608X5R0J106M GRM1885C1H390JA01D Description (1) (2) 06036D106MAT2A GRM31CR60J476ME19L C9, C10 Manufacturer (1) 1F, 10V, Ceramic capacitor, X5R, 0603 (4) (3) AVX (4) Vishay 120pF, 25V, Ceramic capacitor, NPO, 0603 220pF, 50V, Ceramic capacitor, X7R, 0603 (3) 220pF, 25V, Ceramic capacitor, X7R, 0603 (3) 100F, 6.3V, Tantalum capacitor, 1210 AVX AVX 2 2 1 1 N.U. 0603 ceramic cap 18 M9999-033110 Micrel, Inc. MIC5162 Item Part Number C30, C32, C21 C4532X5R0J107M C31 Open (2SEPC2700M) CIN EEE-FPA122UAP Manufacturer TDK (2) Sanyo (5) Panasonic CRCW0603698RFRT1 1 1.2H, 21A, Inductor, 10.4mmX10.4mm 1 Signal MOSFET, SOT-23-6 1 Vishay R2 2700F, 2.5V OS-CON Cap (4) Sumida 2N7002E(SOT-23) CRCW0603820RFRT1 3 1 CDEP105ME-1R2MC R1 100F, 6.3V, Ceramic capacitor, X5R, 1812 1200F, 10V, Electrolytic capacitor, SMD, 10x10.2-case Q1 SUD50N02-06P Qty. (6) L1 Q21, Q22 (8) Description (4) Vishay Low VGS(th) N-Channel 20-V (D-S) 2 Vishay Dale (4) 820, Resistor, 1%, 0603 1 Vishay Dale (4) 698, Resistor, 1%, 0603 1 R3 CRCW06032002FRT1 Vishay Dale (4) 20K, Resistor, 1%, 0603 1 R4 CRCW06034752FRT1 Vishay Dale (4) 47.5K, Resistor, 1%, 0603 1 Vishay Dale (4) 100K, Resistor, 1%, 0603 1 R5 CRCW06031003FRT1 R21 CRCW0805510RFKTA Vishay Dale (4) 510, Resistor, 1%, 0805 1 R23, R24 CRCW06031K00FKTA Vishay Dale (4) 1K, Resistor, 1%, 0603 2 (4) R22 CRCW06030000FKTA Vishay Dale 0, Resistor, 1%, 0603 1 (7) Buck Regulator 10A, 0.4MHz-2MHz Synchronous Buck Regulator 1 (7) Dual Regulator Controller for DDR3 1 U1 MIC22950YML Micrel U21 MIC5162YMM Micrel 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. Sumida: www.sumida.com 7. Micrel, Inc.: www.micrel.com. 8. Panasonic.: www.panasonic.com March 2010 19 M9999-033110 Micrel, Inc. MIC5162 PCB Layout Recommendations (VDDQ and MOSFET Input Separated) Top Layer Top Component Layer March 2010 20 M9999-033110 Micrel, Inc. MIC5162 Middle Layer 1 Middle Layer 2 March 2010 21 M9999-033110 Micrel, Inc. MIC5162 Bottom Layer March 2010 22 M9999-033110 Micrel, Inc. MIC5162 Package Information 10-Pin MSOP (MM) March 2010 23 M9999-033110 Micrel, Inc. MIC5162 Recommended Landing Pattern 10-Pin MSOP (MM) 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 The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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. (c) 2003 Micrel, Incorporated. March 2010 24 M9999-033110 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Micrel: MIC5162YMM MIC5162YMM TR MIC5162YMM-TR