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MIC5164
Dual Regulator Controller for DDR3 GDDR3/4/5 Memory and High-Speed Bus Termination
General Description
The MIC5164 is a dual regulator controller designed for high speed bus termination. It offers a simple, low-cost JEDEC-compliant solution for terminating high-speed, lowvoltage digital buses (i.e. DDR, DDR2, DDR3, SCSI, GTL, SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc) with a Power Good (PG) signal. The MIC5164 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 sunk by the regulator. Designed to provide a universal solution for bus termination regardless of input voltage, output voltage, or load current, the desired MIC5164 output voltage can be programmed by forcing the reference voltage externally to the desired voltage. The MIC5164 operates from an input of 1.35V to 6V, with a second bias supply input required for operation. It is available in the tiny MSOP-10 package with an operating junction temperature range of -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * * * * * Input voltage range: 1.35V to 6V Up to 7A VTT Current Tracking programmable output Power Good (PG) signal Wide bandwidth Logic controlled enable input Requires minimal external components DDR, DDR2, DDR3, memory termination -40C < TJ < +125C JEDEC-compliant bus termination for SCSI, GTL, SSTL, HSTL, LV-TTL, Rambus, LV-PECL, LV-ECL, etc * Tiny MSOP-10 package
Applications
* Desktop computers * Notebook computers * Communication systems * Video cards * 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
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Ordering Information
Part Number MIC5164YMM Temperature Range -40 to +125C Package 10-Pin MSOP Lead Finish 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 1 2 3 4 5 6 7 8 9 10 Pin Name VCC EN VDDQ VREF GND FB COMP LD HD PG 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. Input Supply Voltage. Reference voltage equal to half of VDDQ. For internal use only. Ground. 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. Low-side drive (Output): Connects to the Gate of the external low-side MOSFET. High-side drive (Output): Connects to the Gate of the external high-side MOSFET. Power Good (Output): Open drain output.
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Absolute Maximum Ratings(1)
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.) ....................... 260C Storage Temperature (TS).........................-65C to +150C ESD Rating(3) (HBM) ....................................................+2kV (MM) ...................................................+300V
Operating Ratings(2)
Supply Voltage (VCC).............................................. 3V to 6V Supply Voltage (VDDQ) ....................................... 1.35V to 6V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature Range (TJ)...... -40C < TJ < +125C Junction Thermal Resistance MSOP-10 (JA)..............................................130.5C/W MSOP-10 (JC)................................................42.6C/W
Electrical Characteristics(4)
TA = 25C = VDDQ = 1.5V; VCC = EN = 5V, bold values indicate -40C TJ +125C, unless otherwise specified. See test circuit 1 for test circuit configuration.
Parameter VREF Voltage Accuracy Sourcing; 100mA to 3A VTT Voltage Accuracy (Note 5) Sinking; -100mA to -3A Supply Current (IDDQ) Supply Current (ICC) ICC Shutdown Current (Note 6) Start-Up Time (Note 7) Enable Input Enable Input Threshold Enable Hysteresis EN Pin Input Current Power Good Output Power Good Window Threshold, % of VTT from Nominal Hysteresis Power Good Output Low Voltage Power Good Leakage Current Power Good Startup Delay Time (Note 8) IPG = 2mA (sinking) PG = EN = 5V, FB = VREF; Switch Leakage Current to Ground 1 5 10 2 100 0.01 2.4 300 1.0 15 % % mV A ms VIL < 0.2V (controller shutdown) VIH > 1.2V (controller enable) Regulator Enabled Regulator Shutdown 50 0.01 5.75 1.2 0.3 V V mV A A EN = 1.2V (controller ON) No Load No Load EN = 0.2V (controller OFF); No PG pull-up VCC = 5V external bias; EN = VIN Condition Min. -1% -5 -10 -5 -10 Typ. 0.5VDDQ 0.4 0.4 25 15 0.1 8 Max. +1% +5 +10 +5 +10 140 200 22 27 5 15 30 Units V mV mV mV mV A A mA mA A s s
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Electrical Characteristics(4) (Continued)
TA = 25C = VDDQ = 1.5V; VCC = 5V, VEN = VCC, bold values indicate -40C TJ +125C, unless otherwise specified. See test circuit 1 for test circuit configuration.
Parameter Power Good Output Power Good Deglitch (Note 9) Driver High-Side Gate Drive Voltage Low-Side Gate Drive Voltage
Notes: 1. 2. 3. 4. 5. 6. 7. 8. 9. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model 1.5k in series with 100pF. Specification for packaged product only. The VTT voltage accuracy is measured as a delta voltage from the reference output (VTT - VREF). Shutdown current is measured only on the VCC pin. The VDDQ pin will always draw a minimum amount of current when voltage is applied. Start-up time is defined as the amount of time from EN = VCC to VHD = 90% of VCC. Power Good startup delay is defined as the amount of time from EN =VCC and VFB is within 10% of 1/2VDDQ to VPG = 90% of VCC (VFB = VREF), during startup (VFB is the sense of VTT). 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.
Condition Time after VFB voltage has gone outside of PG window High-Side MOSFET Fully ON High-Side MOSFET Fully OFF Low-Side MOSFET Fully ON Low-Side MOSFET Fully OFF
Min.
Typ.
Max.
Units
5
10
s
4.8
4.97 0.03 0.2 4.97 0.03 0.2
V V V V
4.8
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Test Circuit
Figure 1. Test Circuit
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Typical Characteristics
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Functional Diagram
Figure 2. MIC5164 Block Diagram
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MIC5164 VCC VCC supplies the internal circuitry of the MIC5164 and provides the voltage to drive the external N-Channel MOSFETs. A small 1F ceramic capacitor is recommended for bypassing the VCC pin. 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 10k. The compensation capacitors should not be less than 40pF. EN The MIC5164 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 MIC5164 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.
Functional Description
The MIC5164 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 MIC5164 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. VDDQ The VDDQ pin on the MIC5164 provides the source current through the high side N-Channel and the reference voltage to the device. The MIC5164 can operate at VDDQ input voltages as low as 1.35V. A bypass capacitance will increase performance by improving the source impedance at higher frequencies. VREF Two resistors divide down the VDDQ voltage to provide VREF. The resistors are valued at around 21k. A minimum capacitor value of 120pF from VREF to ground is mandatory.
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MIC5164 VDDQ The VDDQ pin on the MIC5164 provides the source current through the high-side N-Channel and the reference voltage to the device. The MIC5164 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 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 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 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.
Application Information
High-performance memory requires high-speed signaling. This requires special attention 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 2 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 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 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 the general discussion is focused on SSTL, the MIC5164 is also capable of providing bus terminations for SCSI, GTL, HSTL, LV-TTL, Rambus, LV-PECL, DDR, DDR2, DDR3 memory termination and other systems.
Figure 2. SSTL-2 Termination Figure 3. MIC5164 as a DDR Memory Termination for 3.5A Application
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MIC5164 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 undetermined state. Power Good PG signal output remains high as long as output is within 10% range of regulated VTT and goes low if output moves beyond this range. Input Capacitance The MIC5164 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 100F 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. Output Capacitance Large, low-ESR capacitors are recommended for the output (VTT) of the MIC5164. 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 3A peak circuit is 100F. Output capacitance can be increased to achieve greater transient performance. MOSFET Selection The MIC5164 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 required to dissipate.
Figure 4. 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. 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 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. VCCmin=VTT+VGS Feedback and Compensation The feedback (FB) pin is connected to VTT for regulation. An external resistor must be placed between FB and VTT. This allows the error amplifier to be correctly externally compensated. For most applications, a 510 resistor is recommended. The COMP pin on the MIC5164 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 510 FB resistor, a minimum 220pF capacitor is recommended for a 3A 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.
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Micrel, Inc. 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 0's or all 1's). 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: 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 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: PD = (VDDQ -VTT) x I_SOURCE PD = (2.5V -1.25V) x 1.6A PD = 2W This typical SSTL_2 application would require the highside and low-side N-Channel MOSFETs to be able to handle 2 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 (JA) thermal resistance. This is the sum of junction-to-case (JC) thermal resistance, case-to-sink (CS) thermal resistance and sink-to-ambient (SA) thermal resistance: JA = JC + CS + SA
MIC5164 In our example of a 3A peak SSTL_2 termination circuit, we have selected a D-pack N-Channel MOSFET that has a maximum junction temperature of 125C. The device has a junction-to-case thermal resistance of 1.5C/Watt. Our 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 our example:
JA =
JA =
TJ - T A PD
125C - 60C 2W
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: SA = JA - (JC + CS) In our example:
SA = 32.5C / W - (1.5C / W + 0.5C / W )
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 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 from the MOSFET. In this example to dissipate 2W from TO-252 package a 2 oz copper of 1.0 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.
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Micrel, Inc. 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 MIC5164 VCC pin requires a voltage greater than the VGS voltage. For example, our SSTL_2 termination circuit has a VTT
MIC5164 voltage of 1.25V. For N-Channel MOSFET that has a VGS rating of 2.5V, the VCC voltage can be as min as 3.75V. For N-Channel MOSFET that has a 4.5V VGS, the minimum VCC required is 5.75V. 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.
Figure 5. DDR2 Termination (Four MOSFETs Support Up To 7A)
Figure 6. SSTL-2 Application (Two MOSFETs Support Up To 3.5A)
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Functional Characteristics
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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 7. Low-Noise Measurement
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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 MIC5164 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 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. Output Capacitor * 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 * *
* * *
* *
*
*
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Design Example
MIC5164 as a DDR3 Memory Termination Device for 3.5A Application (VDDQ and MOSFET Input Separated)
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Bill of Materials
Item C1, C2, C3, C4 Part Number GRM21BR60J226ME39L C2012X5R0J226M 08056D226MAT2A GRM188R60J106ME47D C5 C1608X5R0J106M 06036D106MAT2A C6 C7 C8 C9, C10 C13 C14 C22, C28 C23, C12 C27 C26 C24, C11 C30, C32, C21 C31 CIN L1 Q1 Q21, Q22 R1 R2 R3 R4 R5 C4532X5R0J107M Open (2SEPC2700M) EEE-FPA122UAP CDEP105ME-1R2MC 2N7002E(SOT-23) SUD50N02-06P CRCW0603820RFRT1 CRCW0603698RFRT1 CRCW06032002FRT1 CRCW06034752FRT1 CRCW06031003FRT1 TDK(2) Sanyo
(5) (6)
Manufacturer Murata
(1)
Description 22F, 6.3V, Ceramic capacitor, X5R, 0805
Qty. 4
TDK(2) AVX(3) Murata AVX TDK
(1)
TDK(2)
(3)
10F, 6.3V, Ceramic capacitor, X5R, 0603 39pF, 50V, Ceramic capacitor, NPO, 0603 39pF, 25V, Ceramic capacitor, NPO, 0603 100pF, 50V, Ceramic capacitor, X7R, 0603 390pF, 50V, Ceramic capacitor, X7R, 0603 47F, 6.3V, Ceramic capacitor, X5R, 1206 1nF, 50V, Ceramic capacitor, X7R, 0603 10nF, 50V, Ceramic capacitor, X7R, 0603 1F, 10V, Ceramic capacitor, X5R, 0603 120pF, 25V, Ceramic capacitor, NPO, 0603 220pF, 50V, Ceramic capacitor, X7R, 0603 220pF, 25V, Ceramic capacitor, X7R, 0603 100F, 6.3V, Tantalum capacitor, 1210 N.U. 0603 ceramic cap 100F, 6.3V, Ceramic capacitor, X5R, 1812 2700F, 2.5V OS-CON Cap 1200F, 10V, Electrolytic capacitor, SMD, 10x10.2-case 1.2H, 21A, Inductor, 10.4mmX10.4mm Signal MOSFET, SOT-23-6 Low VGS(th) N-Channel 20-V (D-S)
(4) (4)
1
GRM1885C1H390JA01D C1608C0G1H390J 06035C101MAT2A GRM188R71H391KA01D GRM31CR60J476ME19L C3216X5R0J476M 12066D476MAT2A GRM188R71H102KA01D GRM188R71H103KA01D 0603ZD105KAT2A GRM188R61A105K VJ0603A121JXACW1BC 06033A121JAT2A VJ0603Y221KXACW1BC 06033C221JAT2A TCJB107M006R0070
Murata(1)
(2)
1 1 1 2 1 1 1 2 1 1 3 1 1 1 1 2 1 1 1 1 1
AVX(3) Murata(1) Murata(1) TDK(2) AVX
(3)
Murata(1) Murata AVX
(1) (3) (1)
Murata AVX
Vishay(4)
(3)
Vishay(4) AVX
(3)
AVX(3)
Panasonic Sumida Vishay(4) Vishay(4)
(7)
Vishay Dale Vishay Dale Vishay Dale Vishay Dale
820, Resistor, 1%, 0603 698, Resistor, 1%, 0603 20K, Resistor, 1%, 0603 47.5K, Resistor, 1%, 0603 100K, Resistor, 1%, 0603
Vishay Dale(4)
(4) (4)
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Bill of Materials (Continued)
Item R21 R23, R24 R22 R25 U1 U21
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.
Part Number CRCW0805510RFKTA CRCW06031K00FKTA CRCW06030000FKTA CRCW06031002FRT1 MIC22950YML MIC5164YMM
Manufacturer Vishay Dale
(4) (4)
Description 510, Resistor, 1%, 0805 1K, Resistor, 1%, 0603 0, Resistor, 1%, 0603 10K, Resistor, 1%, 0603 10A, 0.4MHz-2MHz Synchronous Buck Regulator Dual Regulator Controller for DDR, DDR2, DDR3
Qty. 1 2 1 1 1 1
Vishay Dale Vishay Dale Micrel
(8)
Vishay Dale(4)
(4)
Micrel(8)
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PCB Layout Recommendations - VDDQ and MOSFET Input Tied Together
Top Layer
Top Component Layer
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PCB Layout Recommendations - VDDQ and MOSFET Input Tied Together (Continued)
Middle Layer 1
Middle Layer 2
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PCB Layout Recommendations - VDDQ and MOSFET Input Tied Together (Continued)
Bottom Layer
Bottom Silk
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Package Information
10-Pin MSOP (MM)
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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) 2010 Micrel, Incorporated.
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Price & Availability of MIC5164

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