MAX8686EVKIT+ ,Evaluation Kit for the MAX8686FeaturesThe MAX8686 evaluation kit (EV kit) provides a prov- S Operates from a 6V to 20V Input Supp ..
MAX8688AHETG , Digital Power-Supply Controller/Monitor with PMBus Interface
MAX8688ALETG , Digital Power-Supply Controller/Monitor with PMBus Interface
MAX868EUB ,Regulated / Adjustable -2x Inverting Charge PumpELECTRICAL CHARACTERISTICS(V = +3.3V, SHDN = IN, C1 = C2 = 0.22µF, C = 1µF, C = 10µF, T = 0°C to +8 ..
MAX868EUB ,Regulated / Adjustable -2x Inverting Charge PumpApplications MAX868C/D 0°C to +70°C Dice*MAX868EUB -40°C to +85°C 10 µMAXSmall LCD Panels*Dice are ..
MAX868EUB ,Regulated / Adjustable -2x Inverting Charge PumpFeaturesThe MAX868 inverting charge pump provides a low-cost' Regulated Negative Output Voltage and ..
MB84VD21183EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD21194EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD22181FM-70PBS , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
MB84VD22182EE-90 ,32M (x 8/x16) FLASH MEMORY & 4M (x 8/x16) STATIC RAMFUJITSU SEMICONDUCTORDS05-50204-2EDATA SHEETStacked MCP (Multi-Chip Package) FLASH MEMORY & SRAMCMO ..
MB84VD22183EE-90 ,32M (x 8/x16) FLASH MEMORY & 4M (x 8/x16) STATIC RAMFEATURES• Power supply voltage of 2.7 to 3.3 V• High performance90 ns maximum access time (Flash)85 ..
MB84VD22184FM-70 , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
MAX8686EVKIT+
Evaluation Kit for the MAX8686
General Description
The MAX8686 evaluation kit (EV kit) provides a prov-
en design to evaluate the MAX8686 single-phase, high-
efficiency, 25A, step-down regulator with integrated switches.
The device is a current-mode, synchronous PWM
step-down regulator with integrated MOSFETs, operates
from a 6V to 20V input supply, and generates an adjust-
able output voltage from 0.7V to 5.5V. The switching
frequency of the EV kit is set to 500kHz and is program-
mable from 300kHz to 1MHz. The output voltage is set
to 1.5V.
Features
S Operates from a 6V to 20V Input Supply
S 0.6V to 5.5V Output Voltage Range
S All-Ceramic Capacitor Design
S Programmable Switching Frequency from 300kHz
to 1MHz
S Adjustable Current Limit
S Adjustable Soft-Start
S Monotonic Startup to Prebiased Output
S PCB Supports Additional Second Phase
S RoHS Compliant
S Proven PCB Layout
S Fully Assembled and Tested
DESIGNATIONQTYDESCRIPTION1
390pF Q5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H391J
C2, C4, C83
10nF Q10%, 50V X7R ceramic
capacitors (0402)
Murata GRM155R71H103K
Taiyo Yuden UMK105BJ103KV1
150pF Q5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H151J
TDK C1005C0G1H151J
C5, C19, C21D0Not installed, ceramic capacitors
C6, C20, C21A,
C21B, C21C,
C22–C25,
C26A, C26B,
C27A, C27B,
C28, C29,
C100, C201,
C202, C203Not installed, ceramic capacitors
C101
1000pFQ10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102K
TDK C1608X7R1H102K
DESIGNATIONQTYDESCRIPTION
C11A–C11D3
10µF Q10%, 25V X5R ceramic
capacitors (1206)
Murata GRM31CR61E106K
Taiyo Yuden TMK316BJ106KL
C121
10pF Q5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H100J
TDK C1005C0G1H100J
C141
4.7µF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
TDK C1608X5R0J475K
C15, C16B2
0.1µF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
C16A, C17A2
1µF Q10%, 25V X5R ceramic
capacitors (0603)
Murata GRM188R61E105K
TDK C1608X5R1E105K
C17B1
0.1µF Q10%, 16V X5R ceramic
capacitor (0402)
Murata GRM155R61C104K
Taiyo Yuden EMK105BJ104KV
MAX8686 Evaluation Kit
Evaluates: MAX8686
Component List
Ordering Information appears at end of data sheet.
DESIGNATIONQTYDESCRIPTION
C181
0.22µF Q10%, 25V X5R ceramic
capacitor (0603)
Murata GRM188R61E224K
TDK C1608X5R1E224K
C101, C102,
C1033
100µF Q20%, 6.3V X5R ceramic
capacitors (1210)
Murata GRM32ER60J107M
TDK C3225X5R0J107M
D1131Triple diode (SOT26)
Central Semi CMXD4448
JP1, JP222-pin terminal blocks
On Shore Tech EDZ500/2DS
JP104, JP106Solder lugs
Olander 8C75SPMZR8-32 x 3/4 slot pans
Olander 8CHNTZR8-32 hex nuts
Olander 1485-10
JU1–JU442-pin headers
Sullins PEC36SAAN
JU513-pin header
Sullins PEC36SAAN
L110
568nH Q20%, 18.5A, dual-phase
integrated series inductor
TMP SPB-13070-R56-4 GP
L11A10.56µH, 49A inductor
Vishay IHLP4040DZERR56M01
L11B0Not installed, inductor110kI Q5% resistor (0402)1330kI Q1% resistor (0402
R3, R4, R1930I Q5% resistors (0402)11.5kI Q1% resistor (0402)
R6, R7, R8,
R17, R27,
RS100, RS400Not Installed, resistors
R1013.3I Q5% resistor (1206)
R111332I Q1% resistor (0402)
R12110I Q5% resistor (0603)
R13110I Q5% resistor (0402)
R141121kI Q1% resistor (0402)
R151100kI Q5% resistor (0402)
R161162kI Q1% resistor (0402)
R1814.7I Q5% resistor (0402)
R20–R290Not installed, resistors
DESIGNATIONQTYDESCRIPTION
U1011
Single-phase, high-efficiency,
25A, step-down regulator with
integrated switches
(40 TQFN-EP*)
Maxim MAX8686ETL+
U1020
Not installed, single-phase,
high-efficiency, 25A, step-down
regulator with integrated switches
(40 TQFN-EP*)
Maxim MAX8686ETL+1Shunt (JU5)1PCB: MAX8686EVKIT+ Rev A
OPTIONAL COMPONENTS
C6, C27B20.1µF Q10%, 16V X5R ceramic
capacitors (0402)
C201
1000pF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102K
C21A, C21B,
C21C3
10µF Q10%, 25V X5R ceramic
capacitors (1206)
Murata GRM31CR61E106K
C22, C292
10pF Q5%, 50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H100J
C231
22pF Q0.5%, 50V C0G ceramic
capacitor (0402)
TDK C1005C0G1H220J
C241
4.7µF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
C25, C26B2
0.1µF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
C26A, C27A2
1µF Q10%, 25V X5R ceramic
capacitors (0603)
Murata GRM188R61E105K
C281
0.22µF Q10%, 25V X5R ceramic
capacitor (1206)
Murata GRM188R61E224K
L11B10.56µH 49A inductor
Vishay IHLP4040DZERR56M01
R2013.3I Q5% resistor (1206)
R211332I Q1% resistor (0402)
R22110I Q5% resistor (0603)
MAX8686 Evaluation Kit
Evaluates: MAX8686
Component List (continued)
SUPPLIERPHONEWEBSITE
Central Semiconductor Corp.631-435-1110www.centrasemi.com
Murata Electronics North America, Inc.770-436-1300www.murata-northamerica.com
Taiyo Yuden800-348-2496www.t-yuden.com
TDK Corp.847-803-6100www.component.tdk.com
Vishay402-563-6866www.vishay.com
DESIGNATIONQTYDESCRIPTION
R23110I Q5% resistor (0402)
R24151.1kI Q1% resistor (0402)
R25116.5kI Q1% resistor (0402)
R261162kI Q1% resistor (0402)
R28147I Q5% resistor (0402)
R2910I Q5% resistor (0402)
DESIGNATIONQTYDESCRIPTION
U1021
Single-phase, high-efficiency,
25A, step-down regulator with
integrated switches
(40 TQFN-EP*)
Maxim MAX8686ETL+
MAX8686 Evaluation Kit
Evaluates: MAX8686
Quick Start
Recommended Equipment• MAX8686 EV kit6V to 20V, 5A DC power supplyLoad capable of 25ADigital voltmeter
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify the board operation. Caution: Do not
turn on power supply until all connections are made.
1) Connect the positive terminal of the 12V supply to the
VIN connector (JP1) and the negative terminal to the
nearest PGND connector (JP2).
2) Connect the positive terminal of the 25A load (max)
to the VOUT connectors (JP104) and the negative
terminal to the nearest PGND connectors (JP106).
3) Connect the digital voltmeter across the output-
sensing points (TP_RS+ and TP_RS-).
4) Verify that a shunt is installed across pins 2-3 on jumper
JU5.
5) Verify that shunts are not installed on jumpers JU1–JU4.
6) Turn on the DC power supply.
7) Verify that the voltmeter displays 1.5V.
8) Verify that the power-okay output (JU4) is approxi-
mately 5.4V.
Detailed Description of Hardware
The MAX8686 EV kit provides a proven design to evalu-
ate the MAX8686 step-down regulator with integrated
switches. The applications include server, point-of-load,
ASIC/CPU/DSP, DDR, base station, telecom and net-
working, and RAID-control power supplies. The EV kit is
preset for 1.5V output at load currents up to 25A from a
6V to 20V input supply. The IC features a programmable,
fixed switching frequency up to 1MHz that allows the EV
kit to support an all-ceramic capacitor design and fast
transient responses.
Soft-Start
The IC utilizes an adjustable soft-start function to limit
inrush current during startup. The soft-start time is
adjusted by the value of C2, the external capacitor from
SS to GND. C2 is currently 0.01µF, which gives a soft-
start time of approximately 0.6ms. To adjust the soft-start
time, determine the C2 value using the following formula:
C2 = (25µA x tSS)/VOUT
where tSS is the required soft-start time in seconds and
C2 is in farads.
When an external reference is applied to REFIN (JU5),
soft-start must be provided externally and the external ref-
erence source must be able to sink 25µA soft-start current.
Component List (continued)
Component Suppliers
*EP = Exposed pad.
Note: Indicate that you are using the MAX8686 when contacting these component suppliers.
SHUNT
POSITIONDESCRIPTION
1-2*Use internal reference (3.3V) for output
voltage programming.
OpenUse external reference for output voltage
programming.
JUMPERSHUNT
POSITIONDESCRIPTION
JU11-2
Disables the converter or phase
no. 2. It should be combined
with JU2 and JU3.
Open*Normal operation
JU21-2Disables the converter
Open*Normal operation
JU31-2Disables phase no. 2
Open*Normal operation of phase no. 2
MAX8686 Evaluation Kit
Evaluates: MAX8686
Setting the Output Voltage
The output voltage can be programmed by a resistor-
divider. Install a shunt on jumper JU5 to use the internal
reference voltage (3.3V) generated by the IC. See Table
1 to configure JU5.
The EV kit output can be adjusted from 0.6V to 3.3V by
changing the values of resistors R15 and R14. To deter-
mine the values of the resistor-divider, first select R15
and then use the following equation to calculate R14,
where VOUT is the desired output. The sum of the two
resistors should exceed 165kI.
R14 = R15 x (3.3V/VOUT - 1)
If the desired output voltage is between 3.3V and 5V, set
R14 = 0I and add a resistor-divider from VOUT to RS+
and to RS-.
The output voltage can also be programmed by
connecting JU5 to an external power supply (up to 3.3V).
Connect the positive and negative terminals on JU5 to 1
and 3, respectively.
Regulator Enable (EN1)
To shut down the converter, install a shunt on jumpers
JU1 and JU2. For normal operation of the converter,
remove the shunt from JU2. See Table 2 to configure
jumpers JU1, JU2, and JU3.
Programming the Switching Frequency
The EV kit switching frequency is set to 500kHz. To select
a different switching frequency (from 300kHz to 1MHz),
change capacitor C1 based on the following equation:
C1 = CFREQ - CPARA
= (5 x 105 - 30 x fSW)/(2.7 x fSW) - CPARA
where fSW is the desired switching frequency in kHz,
CFREQ is the total capacitance in picofarads, and CPARA
is the parasitic capacitance from device pads and PCB
traces in picofarads. For this EV kit, the parasitic capaci-
tance is approximately 15pF.
Program the Overcurrent Limit
The overcurrent-limit threshold is set at 25A per phase.
To set a different current limit, change resistor R2 based
on the following equation:
R2 = (ILIM + IP-P/2) x 6.1 x RDC
Where R2 is in kI, ILIM is the desired current limit in
amperes, IP-P is the peak-to-peak ripple current in
the inductor in amperes, RDC is the DC resistance of
the inductor in milliohms, and its dependence on tem-
perature should be included in the calculation. For this
design, DCR = 1.7mI and increases to 2.1mI at +85°C.
For additional information, refer to the MAX8686 IC data
sheet at www.maximintegrated.com.
Table 1. Internal/External Reference
Jumper Description (JU5)
Table 2. Regulator Enable (EN) Jumper
Descriptions (JU1, JU2, JU3)
*Default position.
*Default position.
MAX8686 Evaluation Kit
Evaluates: MAX8686
3026.001 (mil)
3539 (mil)
MAX8686 Evaluation Kit
Evaluates: MAX8686
Figure 2. MAX8686 EV Kit Component Placement Guide—Top Silkscreen
3026.001 (mil)
3539 (mil)
MAX8686 Evaluation Kit
Evaluates: MAX8686
Figure 3. MAX8686 EV Kit PCB Layout—Component Side
