Analog Devices DC2874A-A Quick setup guide

1
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
DESCRIPTION
LTC3310S
5V, Multiphase (40A, 30A, 20A), Synchronous
Step-Down Silent Switcher 2
Demonstration Circuit DC2874A shows the LTC
®
3310S
10A, Low Voltage, Synchronous Step-Down Silent
Switcher operating as a multiphase 2.0MHz, 3.3V to 1.2V
buck regulator. The DC2874A has three build options to
provide a two phase 20A, three phase 30A, or four phase
40A output solution. The LTC3310S supports adjustable
output voltages from 0.5V to VIN and operating frequen-
cies from 500kHz up to 2.25MHz in multiphase operation.
DC2874A operates in pulse skip mode and allows the
slave phases to stop switching first before the master
starts skipping pulses for better low current efficiency.
The DC2874A also has an EMI filter to reduce conducted
EMI. This EMI filter can be included by applying the input
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
voltage at the VIN EMI terminal. The EMI performance of
the board is shown in the EMI TEST RESULTS section.
The red lines in the EMI performance graphs illustrate
the CISPR25 Class 5 peak limits for the conducted and
radiated emission tests.
The Efficiency vs. Load graph shows the efficiency of the
circuit with a 3.3V input for the 2-, 3-, 4-phase circuits.
The LTC3310S datasheet gives a complete description of
the device, operation and application information. The data
sheet must be read in conjunction with this demo manual.
The LTC3310S is assembled in a 3mm x 3mm LQFN pack-
age with exposed pads for low thermal resistance.
Design files for this circuit board are available.
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN/VIN EMI DC2874A Input Voltage Range 2.25 5.5 V
VOUT DC2874A VOUT Voltage Range* 1.176 1.2 1.224 V
IOUT DC2874A Output Current −A, 4 phase build option
−B, 3 phase build option
−C, 2 phase build option
40
30
20
A
A
A
fSW Switching Frequency VIN greater than VOUT 1.8 2 2.2 MHz
Efficiency 2, 3, or 4 phase 92.5 %
*With 1% resistors. Accuracy will impprove to within 1% using 0.1% resistors.

2
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
TYPICAL APPLICATION
DC2874A–A 4–PHASE DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 32A, f
SW
= 2MHz
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
FREQUENCY (MHz)
0
10
20
30
40
50
60
70
80
90
100
110
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµV/m)
(CISPR25 Conducted Emission Test with Class 5 Peak Limits)
Conducted EMI Performance
DC2874A–A 4 PHASE DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 32A, f
SW
= 2MHz
HORIZONTAL POLARIZATION
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµV/m)
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
Radiated EMI Performance
DC2874A–A 4–PHASE DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 32A, f
SW
= 2MHz
VERTICAL POLARIZATION
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
AMBIENT NOISE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–20
–10
0
10
20
30
40
50
60
AMPLITUDE (dBµV/m)
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
Radiated EMI Performance
(I
OUT
= 40A)
VOUT Ripple
100ns/DIV
V
OUT
10mV/DIV
IOUT (A)
0
EFFICIENCY (%)
100
55
95
85
75
65
90
80
70
60
50 2515 35 402010 305
4 PHASE
3 PHASE
2 PHASE
LTC3310S
LTC3310S
VOUT
1.2V
47µF
47µF
PGOOD
SW
FB
RT
EN
MODE/SYNC
ITH
PGOOD
SW
FB
RT
EN
MODE/SYNC
ITH
22µF
x2
10µF
x2
47µF
22µF
x2
10µF
x2
47µF
1µF
1µF
0.22µF
0.22µF
0.22µF
6.8pF
0.22µF
100nH
100nH
10k
390pF
0.1µF
VIN
VIN
2.25V TO 5.5V
PGNDAGNDSSTT
VIN
VIN
VIN
PGNDAGND
140k
100k
274K
L = COILCRAFT,XEL4030-101ME
VOUT Ripple
(IOUT = 40A)

3
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2874A is easy to set up and evalu-
ate the performance of the LTC3310S in multiphase
operation. Refer to Figure1 for the proper measurement
equipment setup and jumper settings. Follow the proce-
dure below to familiarize yourself with the DC2874A.
NOTE:For accurate V
IN
, V
OUT
and efficiency measure-
ments, measure VIN at the VIN SNSE and GND SNSE tur-
rets and V
OUT
at the VOUT SNSE and GND SNSE turrets as
illustrated as VM1 and VM2 in Figure1. When measuring
the input or output voltage ripple, care must be taken
to avoid a long ground lead on the oscilloscope probe.
Measure the output voltage ripple by touching the probe
tip directly across the output turrets or to TP1 as shown
in Figure2.
1. Set the JP1 Jumper to the HI position.
2. With power off, connect the input power supply to VIN
and GND. If the input EMI filter is desired, connect the
input power supply to VIN EMI and GND.
3. Slowly increase PS1 to 1.0V. If AM1 reads less than
20mA, increase PS1 to 3.3V. Verify that VM1 reads
3.3V and VM2 reads 1.2V. Record VM1, VM2, VM3
AM1 and AM2. Connect an oscilloscope voltage probe
as shown in Figure2. Set Channel to AC coupled, volt-
age scale to 10mV and time base to 100ns. Record
VOUT ripple voltage. Verify that PGOOD voltage is above
3V. Set the EN Jumper, JP1, to the HI position.
4. Increase the load by 1A intervals up to full load and
observe the voltage output regulation, ripple voltage.
5. To test the transient response with a base load, turn
off LD1 and add the desired resistor to produce a
minimum load between VOUT and I_STEP turrets (RL
shown on Figure1).
Note that the total load resistance will be RL plus the
parallel combination of R16 and R18 (10mΩ).
The DC2874A uses a buffered signal generator input
to drive a source follower circuit and control the slew
rate and amplitude of the current transient. The source
follower FET, Q1, is operated in the linear region dur-
ing the load step. The current step is measured as the
voltage across the parallel combination of R16 and R18
(10mΩ), VI_STEP.
6. Connect PS2 to the DRIVER BIAS and GND turrets.
Turn on and set PS2 to 8V.
7. Measure the I_STEP voltage to observe the current,
VI_STEP/10mΩ. Adjust the amplitude of the pulse to
provide the desired transient. Adjust the rising and fall-
ing edge of the pulse to provide the desired ramp rate.
Figure3 shows a load step from 8A (RL = 150mΩ) to
36A. Refer to the following equations:
IOUT =
V
I_ STEP
10mΩ
(1)
Where:
VI_ STEP =VSGINPUT −VGS
(2)
8. Set a signal generator with a 1ms pulse width, a 10ms
period and an amplitude from 0V to 3V, and then con-
nect it to the SG_INPUT turret.
NOTE:Do not allow the pulse generator to have more
than a 20% duty cycle. This can allow too much power
to be dissipated in Q1 and can damage the FET.
9. Connect an oscilloscope with a horizontal scale of
200us/Div with one channel having a vertical scale of
2V/Div on the SG_INPUT and another with a vertical
scale of 50mV/Div to the I_STEP turret.
10. Adjust the amplitude of the SG_INPUT pulse to obtain
the desired load pulse observed on the I_STEP turret.
11. Turn off PS1, PS2 and the signal generator. Remove
all connections from demo board.

4
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
QUICK START PROCEDURE
Figure1. Test Setup for the DC2874A Demo Board
Figure2. Technique for Measuring Output Ripple and Step Response
Figure3. DC2874A-A 4-Phase Load Transient Response
Load Transient Response
DC2874A–A 4–Phase
3.3V
IN TO 1.2V
OUT
LOADSTEP 8A TO 36A 1A/µs
200µs/DIV
V
SG_INPUT
2V/DIV
V
OUT
20mV/DIV
V
I_STEP
100mV/DIV

5
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
THEORY OF OPERATION
Introduction to the DC2874A
The DC2874A demonstration circuit features the LTC3310S,
a Low Voltage Synchronous Step-Down Silent Switcher in
two, three, or four phase operation. The LTC3310S is a
monolithic, constant frequency, current mode step-down
DC/DC converter. Connecting the RT pin of the master
phase, to a resistor to AGND programs the frequency from
500kHz to 2.25MHz and configures the MODE/SYNC pin
to become clock output used to drive the MODE/SYNC pin
of the slave phase(s). The DC2874A can operate with an
external clock by shorting the master phase RT pin to VIN
by placing a 0Ω resistor in the R5 location and applying a
sync pulse on the MODE/SYNC turret.
Connecting the FB pin to VIN configures a phase as a
slave. The MODE/SYNC becomes an input and the voltage
control loop is disabled. The slave phase current control
loop is still active and the peak current is controlled via the
shared ITH node. The phasing of a slave phase relative to
the master phase is programmed with a resistor divider
on the RT pin. Refer to Table 5 of the LT3310S datasheet
for more information on setting the slave phase angle.
In the multiphase application the LTC3310S operate in
pulse skip mode. At light loads, the slave phases will start
pulse skipping before the master phase and can eventu-
ally stop switching as the load continues to decrease.
The ability to allow the slave phases to stop switching
at light loads reduces Iq current and switching losses at
light loads.
Setting the compensation for the multiphase is similar to
setting the compensation to a single phase. When deter-
mining the compensation components, C11, C14 and R8,
controlling the loop stability and transient response are
the two main considerations. The LTC3310S has been
designed to operate at a high bandwidth for fast transient
response capabilities. This reduces output capacitance
required to meet the desired transient voltage range. The
mid-band gain of the loop increases with R8 and the band-
width of the loop increases with decreasing C14. C11
along with R6 provides a phase lead which will improve
the phase margin. C13, C33, C34, and C44 along with
R12 provides a high frequency pole to reduce the high
frequency gain. C13, C33, C34, and C44 are in paral-
lel on the ITH node. The sum of these caps will be the
total capacitance on the Master phase ITH pin. Too much
capacitance can slow down the response time.
Loop stability is generally measured using the Bode Plot
method of plotting loop gain in dB and phase shift in
degrees. The 0dB crossover frequency should be less
the 1/6 of the operating frequency to reduce the effects
of added phase shift of the modulator. The control loop
phase margin goal should be 45°. or greater and a gain
margin goal of 8dB or greater. Refer to the LTC3310S
datasheet and LTPowerCAD for more information on
choosing the required components.
The softstart of the multiphase regulator is controlled by a
single cap, C12, on the master phase. After the regulator
is in regulation the SSTT pin can be used to monitor the
temperature of each IC. The master phase temperature
can be monitored at the SSTT turret and slave 1, 2, and 3
can be monitored at TP3, 4, and 6 respectively. Calculate
the die temperature with the formula below:
TJ(°C) =
V
SSTT
4mV
−237
(3)

6
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 4 C2, C16, C23, C36 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D
2 8 C3, C10, C17, C24, C37,
C42, C49, C52
CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L
3 8 C4, C5, C18, C21, C25,
C28, C38, C41
CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A
5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A
7 8 C29, C30, C46-C48, C50,
C51, C53
CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D
8 4 L1-L4 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,
1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200
COILCRAFT, XEL4030-101MEB
9 3 R2, R11, R14 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED
10 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED
11 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
12 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC
13 2 R12, R13 RES., 301k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW0402301KFKEDC
14 4 U1-U4 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF
Additional Demo Board Circuit Components
1 6 C1, C15, C39, C60, C64,
C68
CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,
18mOHMS, TPE
PANASONIC, 6TPE470MI
2 7 C6, C9, C32, C54, C57,
C61, C65
CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
3 8 C7, C8, C20, C26, C27,
C31, C43, C45
CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D
4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS
6 8 C55, C56, C58, C59, C62,
C63, C66, C67
CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC
7 4 L5-L8 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,
8A, 6mOHMS, 1812
WURTH ELEKTRONIK, 74279226101
8 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3
9 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED
10 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED
11 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
12 1 R9 RES., 0 OHM, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED
13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,
SENSE, AEC-Q200
VISHAY, WSHP2818R0200FEA
14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED
(DEMO BOARD DC2874A-A)

7
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED
17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF
Hardware: For Demo Board Only
1 12 E1-E3, E5, E12, E14-E17,
E19-E21
TEST POINT, TURRET, 0.064" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2308-2-00-80-00-00-07-0
2 11 E4, E7, E10, E13, E18,
E22-E24, E26-E28
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
3 5 E6, E8, E9, E11, E25 STUD, #10-32, FASTENER, 0.625" LENGTH PENCOM, PR1422
4 1 JP1 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121
5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831
6 5 MP5-MP9 CONN RING FLAT 8AWG #10 CRIMP MOLEX, 0192210223
7 10 MP10-MP19 NUT, HEX, #10-32, BRASS PENCOM, NU1132
8 5 MP20-MP24 WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526
9 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
(DEMO BOARD DC2874A-A)

8
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C2, C16, C36 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D
2 6 C3, C10, C17, C37, C42,
C49
CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L
3 6 C4, C5, C18, C21, C38,
C41
CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A
5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A
7 6 C29, C46-C48, C50, C51 CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D
8 3 L1-L3 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,
1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200
COILCRAFT, XEL4030-101MEB
9 1 L8 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,
8A, 6mOHMS, 1812
WURTH ELEKTRONIK, 74279226101
10 1 R2 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED
11 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED
12 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
13 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC
14 2 R9, R12 RES., 243k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402243KFKED
15 2 R10, R11 RES., 174k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402174KFKED
16 3 U1-U3 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF
Additional Demo Board Circuit Components
1 6 C6, C9, C32, C57, C61,
C65
CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
2 6 C7, C8, C20, C26, C27,
C45
CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D
3 5 C15, C39, C60, C64, C68 CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,
18mOHMS, TPE
PANASONIC, 6TPE470MI
4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS
6 6 C58, C59, C62, C63, C66,
C67
CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC
7 2 L6, L7 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,
8A, 6mOHMS, 1812
WURTH ELEKTRONIK, 74279226101
8 5 MP5-MP9 CONN RING FLAT 8AWG #10 CRIMP MOLEX, 0192210223
9 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3
10 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED
11 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED
12 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,
SENSE, AEC-Q200
VISHAY, WSHP2818R0200FEA
(DEMO BOARD DC2874A-B)

9
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED
16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED
17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF
Hardware: For Demo Board Only
1 12 E1-E3, E5, E12, E14-E17,
E19-E21
TEST POINT, TURRET, 0.064" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2308-2-00-80-00-00-07-0
2 11 E4, E7, E10, E13, E18,
E22-E24, E26-E28
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB
0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
3 5 E6, E8, E9, E11, E25 STUD, #10-32, FASTENER, 0.625" LENGTH PENCOM, PR1422
4 1 JP1 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121
5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831
6 10 MP10-MP19 NUT, HEX, #10-32, BRASS PENCOM, NU1132
7 5 MP20-MP24 WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526
8 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
(DEMO BOARD DC2874A-B)

10
DEMO MANUAL DC2874A-A/
DC2874A-B/DC2874A-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C2, C16 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D
2 4 C3, C10, C17, C49 CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L
3 4 C4, C5, C18, C21 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A
5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A
7 4 C29, C46-C48 CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D
8 2 L1, L2 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,
1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200
COILCRAFT, XEL4030-101MEB
9 1 L7 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,
8A, 6mOHMS, 1812
WURTH ELEKTRONIK, 74279226101
10 1 R2 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED
11 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED
12 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
13 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC
14 2 U1, U2 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF
Additional Demo Board Circuit Components
1 5 C6, C9, C32, C57, C61 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC
2 4 C7, C8, C26, C27 CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D
3 4 C15, C39, C60, C68 CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,
18mOHMS, TPE
PANASONIC, 6TPE470MI
4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE
5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS
6 4 C58, C59, C62, C63 CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC
7 1 L6 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,
8A, 6mOHMS, 1812
WURTH ELEKTRONIK, 74279226101
8 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3
9 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED
10 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED
11 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
12 1 R11 RES., 0 OHM, 1/16W, 0402, AEC-Q200 NIC, NRC04ZOTRF
13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,
SENSE, AEC-Q200
VISHAY, WSHP2818R0200FEA
14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED
16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED
17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF
(DEMO BOARD DC2874A-C)