MIC5165YMM Evaluation Board User Guide

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