MIC5165 Dual Regulator Controller for DDR3 GDDR3/4/5 Memory Termination General Description Features The MIC5165 is a dual regulator controller designed • Input voltage range: 0.75V to 6V specifically for low-voltage memory termination • Up to 7A VTT Current applications such as DDR3 and GDDR3/4/5. The MIC5165 • Tracking programmable output offers a simple, low-cost JEDEC-compliant solution for • Power Good signal terminating high-speed, low-voltage digital buses with a • Wide bandwidth Power Good (PG) signal. • Logic-controlled enable input The MIC5165 controls two external N-Channel MOSFETs to form two separate regulators. It operates by switching • Requires minimal external components between either the high-side MOSFET or the low-side • DDR3, GDDR3/4/5 memory termination MOSFET, depending on whether the current is being • -40°C < TJ < +125°C sourced to the load or being sunk by the regulator. • Tiny MSOP-10 package Designed to provide a universal solution for memory termination regardless of input voltage, output voltage, or load current, the desired MIC5165 output voltage can be Applications programmed by forcing the reference voltage externally to • Desktop Computers the desired voltage. • Servers The MIC5165 operates from an input voltage as low as • Notebook computers 0.75V up to 6V, with a second bias supply input required for operation. The MIC5165 is available in a tiny MSOP-10 • Workstations package with an operating junction temperature range of • DDR3 andGDDR3/4/5 Memory Termination –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. ____________________________________________________________________________________________________________ Typical Application MIC5165 as a DDR3 Memory Termination Device for 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 June 2010 M9999-061510-B Micrel, Inc. MIC5165 Ordering Information Part Number Temperature Range Package Lead Finish MIC5165YMM –40° to +125°C 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 8 LD Low-Side Drive (Output): Connects to the Gate of the external low-side MOSFET. 9 HD High-Side Drive (Output): Connects to the Gate of the external high-side MOSFET. 10 PG Power Good (Output): Open drain output. June 2010 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 EN pin can be tied directly to VDDQ or VCC for functionality. Do not float the EN pin. Floating this pin causes the enable to be in an undetermined state. Feedback (Input): Input to the internal error amplifier. Compensation (Output): Connect a capacitor and resistor from COMP pin to FB pin for compensation of the internal control loop. 2 M9999-061510-B Micrel, Inc. MIC5165 Absolute Maximum Ratings(1) Operating Ratings(2) VCC to GND.................................................... −0.3V to +7V VDDQ to GND ................................................. −0.3V to +7V EN to GND ....................................................... −0.3V to VCC FB to GND........................................................ −0.3V to VCC VREF to GND................................................. −0.3V to VDDQ COMP to GND.................................................. −0.3V to VCC HD, LD to GND ................................................ −0.3V to VCC PG to GND ....................................................... −0.3V to VCC Lead Temperature (Soldering 10sec.) ....................... 260°C Storage Temperature (TS).........................−65°C to +150°C ESD Rating(3) (HBM) ....................................................................+2kV (MM) ....................................................................+300V Supply Voltage (VCC).............................................. 3V to 6V Supply Voltage (VDDQ) ....................................... 0.75V to 6V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature Range (TJ)...... −40°C < TJ < +125°C Junction Thermal Resistance MSOP-10 (θJA)..............................................130.5°C/W MSOP-10 (θJC)................................................42.6°C/W Electrical Characteristics(4) TA = 25°C with VDDQ = 1.5V; VCC = EN = 5V, bold values indicate –40°C ≤ TJ ≤ +125°C, 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 Sinking; -100mA to -3A -5 -10 0.4 +5 +10 VREF Voltage Accuracy VTT Voltage Accuracy (Note 5) mV Supply Current (IDDQ) EN = 1.2V (controller ON) No Load 25 140 200 µA Supply Current (ICC) No Load 15 22 27 mA ICC Shutdown Current (Note 6) EN = 0.2V (controller OFF); No PG pull-up 0.1 5 µA Start-Up Time (Note 7) VCC = 5V external bias; EN = VIN 8 15 30 µs Enable Input Enable Input Threshold Regulator Enabled Regulator Shutdown 0.3 Enable Hysteresis EN Pin Input Current June 2010 V 1.2 50 VIL < 0.2V (controller shutdown) 0.01 VIH > 1.2V (controller enable) 5.75 3 mV µA M9999-061510-B Micrel, Inc. MIC5165 Electrical Characteristics(4) (Continued) TA = 25°C with VDDQ = 1.5V; VCC = EN = 5V, bold values indicate –40°C ≤ TJ ≤ +125°C, unless otherwise specified. See test circuit 1 for test circuit configuration. Power Good Output Power Good Window Threshold, ±% of VTT from Nominal ±5 Hysteresis ±10 ±15 % 2 % Power Good Output Low Voltage IPG = 2mA (sinking) 100 300 mV Power Good Leakage Current PG = EN = 5V, FB = VREF; Switch Leakage Current to Ground 0.01 1.0 μA Power Good Startup Delay Time (Note 8) Power Good Deglitch (Note 9) 1 Time after FB voltage has gone outside of PG window 2.4 5 ms 10 μs 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 4.97 0.03 4.8 Low-Side MOSFET Fully OFF 0.2 4.97 0.03 V 0.2 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 1.5kΩ 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 VHD = 90% of VCC. 8. Power Good startup delay is defined as the amount of time from EN=VCC and VFB is within ±10% of ½VDDQ to VPG = 90% of VCC (VFB = VREF), during startup (VFB is the sense of VTT). 9. Power Good deglitch is defined as the amount of time from the voltage at FB node going out of PG window (with 10mV overdrive voltage) to PG = LOW. June 2010 4 M9999-061510-B Micrel, Inc. MIC5165 Test Circuit Figure 1. Test Circuit June 2010 5 M9999-061510-B Micrel, Inc. MIC5165 Typical Characteristics IDDQ Current vs. VDDQ Voltage 200 ICC Current vs. Input Voltage IDDQ Current vs. Temperature 20 200 19 175 18 180 160 125 100 ROOM TEMP. 75 50 16 140 120 VDDQ = 2.5V 100 VDDQ = 1.35V 80 VDDQ = 0.75V 15 14 13 12 11 125°C 10 60 9 40 125°C 25 25°C 17 ICC Current (mA) -40°C IDDQ CURRENT (µA) IDDQ CURRENT (µA) 150 VDDQ = 6V -40°C 8 7 20 6 0 0 0 1 2 3 4 5 5 -40 6 -20 0 20 40 60 80 100 120 3 0.3 ICC CURRENT (mA) ICC_Shutdown Current (µA) 14 VDDQ = 1.35V VCC = 5V 12.5 12 11.5 VDDQ = 1.35V VCC = 3V 11 0.25 0.2 0.15 0.1 -40°C 10.5 0.05 10 ROOM TEMP. 9.5 0 9 -40 -20 0 20 40 60 80 100 0 120 5 5.5 6 0.3 125°C ICC SHUTDOWN CURRENT (µA) 14.5 4.5 ICC Shutdown Current vs. Temperature 0.35 15 13 4 VCC VOLTAGE (V) ICC Shutdown Current vs. VCC Voltage ICC Current vs. Temperature 13.5 3.5 TEMPERATURE (ºC) VDDQ VOLTAGE (V) 1 2 3 4 5 0.25 0.2 0.15 VDDQ = 0.75V VDDQ = 6V 0 6 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (ºC) VTT - VREF vs. LOAD (A) HD Prop Delay vs. Temperature HD Prop Delay vs. VDDQ Voltage VDDQ = 2.5V 0.05 VCC VOLTAGE (V) TEMPERATURE (ºC) VDDQ = 1.35V 0.1 2.5 10 10 9.5 8.5 -40°C 8 7.5 25°C 7 6.5 125 °C 6 VDDQ = 1.35V VTT-VREF (mV) HD PROP DELAY (µs) HD PROP DELAY (µs) 9 9 2.0 VDDQ = 0.75V 9.5 8.5 8 7.5 7 6.5 5 5 2 3 4 VDDQ VOLTAGE (V) June 2010 VDDQ = 2.5V 0.5 0.0 VDDQ = 0.75V VDDQ = 2.5V 5.5 1 VDDQ = 6V 1.0 6 5.5 0 VDDQ = 1.35V 1.5 5 6 -0.5 VDDQ = 6V -40 -20 0 20 40 60 80 -3 100 120 -2 -1 0 1 2 3 LOAD (A) TEMPERATURE (ºC) 6 M9999-061510-B Micrel, Inc. MIC5165 Typical Characteristics (Continued) VTT - VREF vs. TEMPERATURE (ºC) 2.5 3V VTT - VREF (mV) 2.0 1.5 1.0 -0.1A -3A 0.5 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (ºC) June 2010 7 M9999-061510-B Micrel, Inc. MIC5165 Functional Characteristics June 2010 8 M9999-061510-B Micrel, Inc. MIC5165 Functional Diagram Figure 2. MIC5165 Block Diagram June 2010 9 M9999-061510-B Micrel, Inc. MIC5165 VCC VCC supplies the internal circuitry of the MIC5165 and provides the voltage to drive the external N-Channel MOSFETs. A small 1μF ceramic capacitor is recommended for bypassing the VCC pin. Functional Description The MIC5165 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 half, providing the reference (VREF) voltage. The MIC5165 controls two external N-Channel MOSFETs to form two separate regulators. It operates by switching between either the high-side MOSFET or the low-side MOSFET, depending on whether the current is being sourced to the load or being sunk by the regulator. FB and COMP The feedback (FB) pin provides the path for the error amplifier to regulate VTT. A feedback resistor is recommended and resistor values should not exceed 10kΩ. The compensation capacitors should not be less than 40pF. VDDQ The VDDQ pin on the MIC5165 provides the source current through the high-side N-Channel and the reference voltage to the device. The MIC5165 can operate at VDDQ input voltages as low as 0.75V. A bypass capacitance will increase performance by improving the source impedance at higher frequencies. EN The MIC5165 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. PG MIC5165 features a Power Good (PG) output. PG is an open drain output with an active high signal. PG requires a pull-up resistor to VCC. VREF Two resistors divide down the VDDQ voltage to provide VREF. The resistors are valued at around 21kΩ. A minimum capacitor value of 120pF from VREF to ground is mandatory. June 2010 10 M9999-061510-B Micrel, Inc. MIC5165 The MIC5165 provides two drive signals, the high-side MOSFET acts as a pass element to provide output voltage and low side MOSFET acts as pull-down to regulate the output termination voltage (VTT). An internal error amplifier compares the termination voltage (VTT) and VREF, controlling two external N-Channel MOSFETs to sink or source current to maintain a termination voltage (VTT) equal to VREF. These MOSFETs receive their enhancement voltage from a separate VCC pin on the device. Although the general discussion is focused on DDR3, the MIC5165 is also capable of providing bus terminations for DDR, DDR2 and GDDR3/4/5. Application Information Synchronous Dynamic Random Access Memory (SDRAM) has continually evolved over the years to keep up with ever-increasing computing needs. The latest addition to SDRAM technology is DDR3 SDRAM. DDR3 SDRAM is the third generation of the DDR SDRAM family and offers improved power savings, higher data bandwidth and enhanced signal quality with multiple OnDie Termination (ODT) selection. In DDR3 SDRAM the values of the ODT are based on the value of an external resistor. In addition to using this external resistor for setting the ODT value, it is also used for calibrating the ODT value so that it maintains its resistance value to within a 10% tolerance. To improve signal integrity and support higher frequency operation of memory read/write, the JEDEC committee defined a fly-by termination scheme used with the clocks, the command bus and address bus signals. The fly-by topology reduces Simultaneous Switching Noise (SSN) by deliberately causing flight-time skew between the data and strobes at every DRAM as the clock, address and command signals traverse the DIMM. The DDR3 SDRAM uses a programmable impedance output buffer. Currently, there are two drive strength settings, 34Ω and 40Ω. The 40Ω drive strength setting is currently a reserved specification defined by JEDEC, but available on the DDR3 SDRAM. VDDQ The MIC5165 can operate at VDDQ voltages as low as 0.75V. Due to the possibility of large transient currents being sourced from this line, significant bypass capacitance will increase performance by improving the source impedance at higher frequencies. Since the reference is simply VDDQ/2, perturbations on 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. 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 high-speed transients do not exceed the dynamic voltage tolerance requirement of VTT. The 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 A minimum capacitor value of 120pF from VREF to ground is required to remove high-frequency signals reflected from the source (Refer to Figure 4). 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 3. Dynamic OCT between Stratix III/IV FPGA Devices Figure 4. MIC5165 as a DDR3 Memory Termination Device for 7A Application June 2010 11 M9999-061510-B Micrel, Inc. MIC5165 low if output moves beyond this range. VDDQ Input Capacitance The MIC5165 application operates in the linear region during the steady state condition, so there are no switching current pulses from the input capacitor. The application does not require a bulk input capacitor, but using one greatly improves device performance during fast load transients. Since output voltage VTT follows the input voltage VDDQ attention should be given to possible voltage dips on VDDQ pin. Capacitors with low ESR such as OS-CON and ceramics are recommended for bypassing the input. Although a 100μF 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. VREF 120pF GND Figure 5. VDDQ Divided Down to Provide VREF 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 MIC5165. 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 and ceramic are excellent choices for this application. OS-CON capacitors have extremely low ESR and a 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 3.5A peak circuit is 100μF. Output capacitance can be increased to achieve greater transient performance. VCC The VCC voltage range is from 3V to 6V, but the minimum voltage on the VCC pin should consider the Gate-to-Source voltage of the MOSFET and VTT voltage. For example, on a DDR3 compliant terminator, VDDQ equals 1.5V and VTT equals 0.75V. If the N-Channel MOSFET selected requires a gate-source voltage of 2.5V, VCC should be a minimum of 3.25V. VCCmin=VTT+VGS 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. For most applications, a 510Ω resistor is recommended. The COMP pin on the MIC5165 is the output of the internal error amplifier. By placing a capacitor and resistor between the COMP pin and the FB pin, this coupled with the feedback resistor, places an external pole and zero on the error amplifier. With a 510Ω feedback resistor, a minimum 220pF capacitor is recommended for a 3.5A peak termination circuit. An increase in the load will require additional N-Channel MOSFETs and/or increase in output capacitance may require feedback and/or compensation capacitor values to be changed to maintain stability. MOSFET Selection The MIC5165 utilizes external N-Channel MOSFETs to sink and source current. MOSFET selection will be determined by two main characteristics: size and gate threshold (VGS). MOSFET Power Requirements One of the most important factors to determine is the amount of power the MOSFET is going to be required to dissipate. Power dissipation in a DDR3 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 Enable 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 indeterminate state. Power Good Power Good signal output remains high as long as output is within ±10% range of regulated VTT and goes June 2010 12 M9999-061510-B Micrel, Inc. MIC5165 calculation for the high-side MOSFET is as follows: The required junction-to-ambient thermal resistance can be calculated as follows: PD = (VDDQ − VTT) × I_SOURCE θ JA = Where I_source is the average source current. Power dissipation for the low-side MOSFET is as follows: TJ − T A PD Where TJ is the maximum junction temperature, TA is the maximum ambient temperature and PD is the power dissipation. In our example: PD = VTT × I_SINK where I_sink is the average sink current. In a typical 3.5A peak DDR3 circuit, power considerations for MOSFET selection would occur as follows: PD = (VDDQ −VTT) × I_SOURCE θ JA = TJ − T A PD θ JA = 125°C - 60°C 1.3125W θ JA = 49.52 PD = (1.5V −0.75V) × 1.75A °C W PD = 1.3125 W This shows that our total thermal resistance must be better than 49.52°C/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: This typical DDR3 application would require the highside and low-side N-Channel MOSFETs to be able to handle 1.3125 Watts each. In higher current applications, multiple N-Channel MOSFETs may be placed in parallel to spread the power dissipation. 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 (θJA) thermal resistance. This is the sum of junction-to-case (θJC) thermal resistance, caseto-sink (θCS) thermal resistance and sink-to-ambient (θSA) thermal resistance: θSA = θJA − (θJC + θCS) In our example: θSA = θJA − (θJC + θCS) θ SA = 49.52 θ SA = 47.52 θJA = θJC + θCS + θSA In our example of a 3.5A peak DDR3 termination circuit, we have selected a D-pack N-Channel MOSFET that has a maximum junction temperature of 125°C. The device has a junction-to-case thermal resistance of 1.5°C/W. Our application has a maximum ambient temperature of 60°C. June 2010 °C °C °C - (1.5 + 0 .5 ) W W W °C W In most cases, case-to-sink thermal resistance can be assumed to be about 0.5°C/W. The DDR3 termination circuit for our example, using two D-pack N-Channel MOSFETs (one high-side and one low-side) will require enough copper area to spread the heat away from the MOSFET. In this example to dissipate 1.3W from TO-252 package a 2 oz copper of 0.4 in2 on component side is required. In some cases, airflow may also help to reduce thermal resistance. For different MOSFET package refer to manufacturer Data Sheet for copper area requirements. 13 M9999-061510-B Micrel, Inc. MIC5165 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 or higher. Since the source of the high side N-Channel MOSFET is connected to VTT, the MIC5165 VCC pin requires a voltage equal to or greater than the VGS + VTT voltage. For example, our DDR3 termination circuit has a VTT voltage of 0.75V. For an N-Channel MOSFET that June 2010 has a VGS rating of 2.5V, the VCC voltage can be as min as 3.25V. For an N-Channel MOSFET that has a 4.5V VGS, the minimum VCC required is 5.25V. 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. 14 M9999-061510-B Micrel, Inc. MIC5165 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. By maintaining the shortest possible ground lengths on the oscilloscope probe, true ripple measurements can be obtained. 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. Figure 6. Low-Noise Measurement June 2010 15 M9999-061510-B Micrel, Inc. MIC5165 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 MIC5165 controller application. 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. 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 VIN and PGND connections short. • Place several vias to the ground plane close to the input capacitor ground terminal, but not between the input capacitors and MOSFET. June 2010 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. Output Capacitor Input Capacitor • • 16 • 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. M9999-061510-B Micrel, Inc. MIC5165 Design Example MIC5165 as a DDR3 Memory Termination Device for 3.5A Application (VDDQ and MOSFET Input Separated) June 2010 17 M9999-061510-B Micrel, Inc. MIC5165 Bill of Materials Item C1, C2, C3, C4 Part Number GRM21BR60J226ME39L C6 Qty. Murata TDK(2) 08056D226MAT2A AVX(3) 22µF, 6.3V, Ceramic capacitor, X5R, 0805 4 10µF, 6.3V, Ceramic capacitor, X5R, 0603 1 Murata(1) C1608X5R0J106M TDK(2) 06036D106MAT2A (3) GRM1885C1H390JA01D Description (1) C2012X5R0J226M GRM188R60J106ME47D C5 Manufacturer AVX Murata(1) 39pF, 50V, Ceramic capacitor, NPO, 0603 (2) 1 C1608C0G1H390J TDK C7 06035C101MAT2A AVX(3) 100pF, 50V, Ceramic capacitor, X7R, 0603 1 C8 GRM188R71H391KA01D Murata(1) 390pF, 50V, Ceramic capacitor, X7R, 0603 1 GRM31CR60J476ME19L Murata(1) 47µF, 6.3V, Ceramic capacitor, X5R, 1206 2 1nF, 50V, Ceramic capacitor, X7R, 0603 1 10nF, 50V, Ceramic capacitor, X7R, 0603 1 1µF, 10V, Ceramic capacitor, X5R, 0603 1 120pF, 25V, Ceramic capacitor, NPO, 0603 2 C9, C10 C13 C14 C22, C28 C23, C12 C27 C26 C3216X5R0J476M TDK(2) 12066D476MAT2A (3) AVX GRM188R71H102KA01D Murata(1) GRM188R71H103KA01D (1) 0603ZD105KAT2A Murata (3) AVX GRM188R61A105K Murata(1) VJ0603A121JXACW1BC Vishay(4) 06033A121JAT2A 39pF, 25V, Ceramic capacitor, NPO, 0603 AVX(3) Vishay(4) 220pF, 50V, Ceramic capacitor, X7R, 0603 06033C221JAT2A AVX(3) 220pF, 25V, Ceramic capacitor, X7R, 0603 TCJB107M006R0070 AVX(3) 100µF, 6.3V, Tantalum capacitor, 1210 1 N.U. 0603 ceramic cap 3 100µF, 6.3V, Ceramic capacitor, X5R, 1812 1 2700µF, 2.5V OS-CON Cap 1 1200µF, 10V, Electrolytic capacitor, SMD, 10x10.2-case 1 VJ0603Y221KXACW1BC C24, C11 C30, C32, C21 C4532X5R0J107M C31 Open (2SEPC2700M) CIN EEE-FPA122UAP L1 CDEP105ME-1R2MC TDK (2) Sanyo(5) Panasonic(6) Sumida (7) 1 1.2µH, 21A, Inductor, 10.4mmX10.4mm 1 (4) Signal MOSFET, SOT-23-6 2 (4) Low VGS(th) N-Channel 20-V (D-S) 1 Q1 2N7002E(SOT-23) Vishay Q21, Q22 SUD50N02-06P Vishay R1 CRCW06031101FRT1 Vishay Dale(4) 510Ω, Resistor, 1%, 0603 1 R2 CRCW0603698RFRT1 (4) Vishay Dale 698Ω, Resistor, 1%, 0603 1 R3 CRCW06032002FRT1 Vishay Dale(4) 20K, Resistor, 1%, 0603 1 CRCW06034752FRT1 (4) 47.5K, Resistor, 1%, 0603 1 R4 June 2010 Vishay Dale 18 M9999-061510-B Micrel, Inc. MIC5165 Bill of Materials (Continued) Item R5 Part Number CRCW06031003FRT1 Manufacturer Description Qty. (4) 100K, Resistor, 1%, 0603 1 (4) Vishay Dale R21 CRCW0805510RFKTA Vishay Dale 510Ω, Resistor, 1%, 0805 1 R23, R24 CRCW06031K00FKTA Vishay Dale(4) 1K, Resistor, 1%, 0603 1 CRCW06030000FKTA (4) 0Ω, Resistor, 1%, 0603 1 (4) 10K, Resistor, 1%, 0603 1 R22 R25 CRCW06031002FRT1 Vishay Dale Vishay Dale (8) U1 MIC22950YML Micrel U21 MIC5165YMM Micrel(8) 10A, 0.4MHz-2MHz, Synchronous Buck Regulator 1 Dual Regulator Controller for DDR3 1 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. 8. Micrel, Inc.: www.micrel.com. June 2010 19 M9999-061510-B Micrel, Inc. MIC5165 PCB Layout Recommendations Top Layer Top Component Layer June 2010 20 M9999-061510-B Micrel, Inc. MIC5165 PCB Layout Recommendations (Continued) Mid-1 Layer Mid-2 Layer June 2010 21 M9999-061510-B Micrel, Inc. MIC5165 PCB Layout Recommendations (Continued) Bottom Layer Bottom Silk June 2010 22 M9999-061510-B Micrel, Inc. MIC5165 Package Information 10-Pin MSOP (MM) June 2010 23 M9999-061510-B Micrel, Inc. MIC5165 Recommended Land Pattern 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. © 2010 Micrel, Incorporated. June 2010 24 M9999-061510-B