Analog Devices DC3018A User manual

1
DEMO MANUAL DC3018A
Rev. 0
DESCRIPTION
LTC 3 311S
3.3V to 1.2V at 12.5A, 2MHz Low EMI Buck
Regulator in a 1.17cm2Solution
Demonstration Circuit 3018A features the LT C
®
3311S
12.5A, low voltage, synchronous step-down Silent
Switcher
®
2 operating as a 2MHz 3.3V to 1.2V 12.5A buck
regulator. The LTC3311S supports output voltages from
0.5V to VIN with operating frequencies from 500kHz up
to 5MHz. The LTC3311S is a compact, ultralow emission,
high efficiency, and high speed synchronous monolithic
step-down switching regulator. The integrated bypass
capacitors optimize all the fast current loops and make it
easier to minimize EMI/EMC emissions by reducing layout
sensitivity. Fast minimum on-time of 35ns enables high
VIN to low VOUT conversion at high frequency.
DC3018A is set up to run in forced continuous mode with
a 2MHz switching frequency but can be configured to
pulse skip mode or different switching frequencies. RT is
connected to VIN which sets the MODE/SYNC pin as an
input and allows the LTC3311S to sync from an external
clock. Connecting the MODE/SYNC pin to VIN sets the
mode to pulse skip mode and connecting the MODE/SYNC
pin to GND sets the mode to forced continuous mode.
The Efficiency vs Load graph shows the efficiency and
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
the power loss of the circuit with a 3.3V input in forced
continuous mode operation.
The DC3018A also has an EMI filter to reduce conducted
EMI. This EMI filter can be included by applying the input
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 LTC3311S data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo. The
LTC3311S is assembled in a 3mm × 3mm LQFN package
with exposed pads for low thermal resistance. The layout
recommendations for low EMI operation and maximum
thermal performance are available in the data sheet sec-
tion Low EMI PCB Layout.
Design files for this circuit board are available.
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 2.25 5.5 V
VOUT Voltage Range* 1.176 1.2 1.224 V
OUTPUT Current VIN > 3V 12.5 A
Switching Frequency 1.8 2.2 MHz
Minimum On-Time 35 60 ns
*With 1% feedback resistors. Accuracy will improve to within 1% using 0.1% FB resistors.

2
DEMO MANUAL DC3018A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 3018A is easy to set up and evalu-
ate the performance of the LTC3311S. Refer to Figure1
for proper measurement equipment setup and follow the
procedure below:
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 1V. If AM1 reads less than
20mA,increasePS1to3.3V.Verifythat VM1reads 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, voltage
scale to 20mV and time base to 10μs. Record VOUT
ripple voltage. Verify that PGOOD voltage is above 3V.
Calculate die temperature using formula below:
TJ(°C) =
V
SSTT
4mV
– 273
4. Increasethe loadby 1Aintervals upto12Aand observe
the voltage output regulation, ripple voltage, and the
voltage on the SSTT turret. Observe the switching
waveform by contacting a second voltage probe, set
to 1V scale, to the SW node of UI pins 6, 7, 8 and 9
as shown in Figure1.
5. If pulse skip mode is desired, set PS1 to 0V. Install a
100kresistorin the R3location andremove R6or short
the MODE/SYNC turret to VIN. Repeat steps 1 through
4. In step 4 observe that the switching waveform is
now operating in pulse skip mode at low currents.
6. To changethefrequency, removeR4 and R6if installed.
Install the desired RT resistor in the R7 location.
Note, the MODE/SYNC pin is an output when R4 is
installed and the MODE/SYNC pin should have high
impedance to GND and VIN. Size the inductor, output
capacitors and compensation components to provide
the desired inductor ripple and a stable output. Refer
tothe LTC3311Sdata sheet andLTPowerCADfor more
information on choosing the required components.
7. To test the transient response with a base load, 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
R14 (50mΩ). Adjust a signal generator with a 10ms
period, 10% duty cycle and an amplitude from 1V to
2V to start.
8. Measure the I_STEP voltage to observe the current,
VI_STEP/50mΩ. Adjust the amplitude of the pulse to
provide the desired transient. Adjust the rising and
falling edge of the pulse to provide the desired ramp
rate. Figure 3 shows a load step from 2.5A(RL =
0.43Ω) to 8A. Refer to the following equations:
I
OUT =
V
I_STEP
50mΩ
VGS = VSG_INPUT – VI_STEP
9. Turn off PS1 and Load. Remove all connections to
demo board.

3
DEMO MANUAL DC3018A
Rev. 0
Figure2. Technique for Measuring Output Ripple and Step Response
QUICK START PROCEDURE
Figure1. Test Setup for the DC3018A Demo board
EN SSTT GND
GND
MP3
C9
E3 E5E12
E11
E13
E7
E8
E2E20E1E17
E19
E18
E10
E9
MP4
E4
E6
E16E15
E21
MP2MP1
E14
R7
R12
C3
C2
C5
C6
L1U1
C4
C11
C10
C20
C23
C22C21
C19
C12
R10
R13
R9
GND GND
GND
PS1
AM1
VIN
VIN
SNSE SNSE SNSE SNSE
VOUT
VOUT
1.2V
12.5A
I_STEP
2.25V - 5.5V
2.25V - 5.5V TP3
TP2
TP1
SG_INPUTPGOOD
(VIN MAX)
VIN EMI 20V MAX)
MODE/SYNC
EN
HI
LO
JP1
SG1
OSCOPE
VM2VM1
AM2
RL
dc3018a F01
+–
VM3
OSCOPE
LOAD
+–

4
DEMO MANUAL DC3018A
Rev. 0
dc3018a CS01a
140k
22µF
×3
100k
VOUT
1.2V
12.5A
6.8pF
22µF 22µF
0.1µF
SW
EN
AGND
RT
FB
MODE/SYNC
ITH
SSTT
PGOOD
0.22µF 0.1µF 0.1µF
1µF
0.22µF
15k
470pF
VIN
VIN
VIN
V
IN
2.25V TO
5V
PGND
LTC3311S
100nH
Figure3. Technique for Measuring Load Step Response
QUICK START PROCEDURE
CIRCUIT SCHEMATIC
Efficiency vs Load Current
1.2V, 12.5A Step-Down Converter
Load Transient Response Forced
Continuous Mode
3.3V
IN TO 1.2V
OUT
LOADSTEP 2.5A TO 10A 1A/µs
20µs/DIV
V
SG_INPUT
2V/DIV
V
I_STEP
200mV/DIV
1.2V
V
OUT
20mV/DIV
dc3018a F03
V
IN
= 3.3V
V
OUT
= 1.2V
f
= 2MHz
EFFICIENCY
POWER LOSS
I
LOAD
(A)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
0
10
20
30
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
EFFICIENCY (%)
POWER LOSS (W)
dc3018a CS01b

5
DEMO MANUAL DC3018A
Rev. 0
BOARD PHOTO

6
DEMO MANUAL DC3018A
Rev. 0
DC3018A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 10A, 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)
dc3018a ETR01
EMI TEST RESULTS
Conducted EMI Performance (CISPR25 Conducted
Emission Test with Class 5 Peak Limits)
Radiated EMI Performance (CISPR25 Radiated
Emission Test with Class 5 Peak Limits)
Radiated EMI Performance (CISPR25 Radiated
Emission Test with Class 5 Peak Limits)
DC3018A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 10A, 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)
dc3018a ETR02
DC3018A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 10A, 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)
dc3018a ETR03

7
DEMO MANUAL DC3018A
Rev. 0
THEORY OF OPERATION
Introduction to the DC3018A
The DC3018A demonstration circuit features the
LTC3311S, a low voltage synchronous step-down Silent
Switcher. The LTC3311S is a monolithic, constant fre-
quency, current mode step-down DC/DC converter. An
oscillator, with frequency set using a resistor on the RT
pin, turns on the internal top power switch at the begin-
ning of each clock cycle. Current in the inductor then
increases until the top switch comparator trips and turns
off the top power switch. The peak inductor current at
which the top switch turns off is controlled by the volt-
age on the internal ITH node. The error amplifier servos
the ITH node by comparing the voltage on the VFB pin
with an internal 500mV reference. When the load current
increases, it causes a reduction in the feedback voltage
relative to the reference leading the error amplifier to
raise the ITH voltage until the average inductor current
matches the new load current. When the top switch turns
off, the synchronous power switch turns on until the next
clock cycle begins or the inductor current falls to zero.
If overload conditions result in excessive current flowing
through the bottom switch, the next clock cycle will be
delayed until the switch current returns to a safe level.
If the EN pin is low, the LT3311S is in shutdown and in a
low quiescent current state. When the EN pin is above its
threshold, the switching regulator will be enabled.
The MOD/SYNC pin synchronizes the switching frequency
to an external clock, is a clock output or sets the PWM
mode. The PWM modes of operation are either pulse skip
or forced continuous. See the LTC3311S data sheet for
more detailed information.
The maximum allowable operating frequency is influ-
enced by the minimum on time of the top switch, the
ratio of VOUT to VIN and the available inductor values. The
maximum allowable operating frequency may be calcu-
lated using a minimum tON of 35ns in the formula below.
fSW(MAX) =
V
OUT
VIN(MAX) • tON(MIN)
Select an operating switching frequency below fSW(MAX).
Typically, it is desired to obtain an inductor current of 30%
of the maximum LTC3311S operating load, 12.5A. Use the
formulas below to calculate the inductor value to obtain a
30% (3.75A) inductor ripple for the operating frequency.
L≥VOUT
3.75A •f
SW
•1−VOUT
V
IN(MAX)
⎛
⎝
⎜⎞
⎠
⎟for VOUT
V
IN(MAX)
≤0.5
L≥
0.25•V
IN(MAX)
3.75A •fSW
for VOUT
VIN(MAX)
>0.5
When determining the compensation components, C4,
C10, C11 and R12, controlling the loop stability and
transient response are the two main considerations. The
LTC3311S has been designed to operate at a high band-
width for fast transient response capabilities. This reduces
output capacitance required to meet the desired tran-
sient response. The mid-band gain of the loop increases
with R12 and the bandwidth of the loop increases with
decreasing C11. C4 along with R4 provides a phase lead
which will improve the phase margin. C10 along with
R12 provide a high frequency pole to reduce the high
frequency gain.
Loop stability is generally measured using the Bode plot
method of plotting loop gain in dB and phase in degrees.
The 0dB crossover frequency should be less than 1/6 of
the operating frequency to reduce the effects of added
phase shift of the modulator. The control loop phase mar-
gin goal should be 45° or greater and a gain margin goal
of 8dB or greater.

8
DEMO MANUAL DC3018A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C2, C3 CAP., 22µF, X5R, 25V, 20%, 0805 AVX, 08053D226MAT2A
2 1 C4 CAP., 6.8pF, C0G, 50V, ±0.25pF, 0402 MURATA, GJM1555C1H6R8CB01D
3 3 C5, C6, C8 CAP., 47µF, X5R, 6.3V, 20%, 0805, AEC-Q200 MURATA, GRT21BR60J476ME13L
4 1 C9 CAP., 0.033µF, X7R, 25V, 10%, 0402 WURTH ELEKTRONIK, 885012205053
5 1 C11 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA
6 1 L1 IND., 0.1µH, PWR, SHIELDED, 20%, 25.8A, 1.8mΩ, 4.3x4.3mm,
XEL4030, AEC-Q200
COILCRAFT, XEL4030-101MEB
7 1 R9 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
8 1 R10 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED
9 1 R12 RES., 15k, 1%, 1/16W, 0402 VISHAY, CRCW040215K0FKED
10 1 U1 IC, LOW VOLTAGE SYN. STEP-DOWN REG, LQFN-18 ANALOG DEVICES, LTC3311SEV#PBF
Additional Demo Board Circuit Components
1 2 C1, C18 CAP., 470µF, TANT, POSCAP, 6.3V, 20%, 7343, 18mΩ, TPE PANASONIC, 6TPE470MI
2 2 C7, C15 CAP., 0.1µF, X5R, 25V, 10%, 0402 AVX, 04023D104KAT2A
3 0 C10, C12 CAP., OPTION, 0402
4 4 C13, C14, C16, C17 CAP., 10µF, X5R, 10V, 20%, 0603 AVX, 0603ZD106MAT2A
5 2 C19, C20 CAP., 0.22µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C224KE02D
6 1 C21 CAP., 1µF, X5R, 10V, 20%, 0402 MURATA, GRM153R61A105ME95D
7 2 C22, C23 CAP., 0.1µF, X7S, 16V, 10%, 0201 MURATA, GRM033C71C104KE14D
8 1 L2 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 8A, 6mΩ, 1812 WURTH ELEKTRONIK, 74279226101
9 1 Q1 XSTR., MOSFET, N-CH, 40V, 14A, DPAK (TO-252) VISHAY, SUD50N04-8M8P-4GE3
10 1 R1 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED
11 1 R2 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED
12 0 R3, R5, R7 RES., OPTION, 0402
13 2 R4, R13 RES., 0Ω, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED
14 2 R6, R11 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
15 1 R8 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED
16 1 R14 RES., 0.05Ω, 1%, 10W, 2818, AEC-Q200, METAL, HP VISHAY, WSHP2818R0500FEA
17 1 R15 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
Hardware: For Demo Board Only
1 10 E1-E3, E5, E12, E14-E17, E20 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0
2 6 E4, E7, E10, E13, E18, E21 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, E19 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,
SWAGE, 0.218"
KEYSTONE, 575-4
4 1 JP1 CONN., HDR, MALE, 1x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121
5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833
6 1 XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

9
DEMO MANUAL DC3018A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
HI LO
1.2V 12.5A
2.25V - 5.5V
EN
VOUT
MODE/SYNC
GND
EN
SSTT
PGOOD
GND
VIN
GND
VIN
GND
VOUT
GND
VOUT
SNSE
GND
SNSE
VIN
SNSE
GND
SNSE
OPT
REVISION HISTORY
ECO REV DESCRIPTION APPROVED DATE
-PRODUCTION MM 02-12-202002
PCA ADDITIONAL PARTS
PULSE SKIP/SYNC
FORCED CONT
(VIN MAX)
MODE
PULSE SKIP
FORCED CONT.
R3 R4 R7
OPEN 0 or OPEN * POPULATED OR OPEN **
100k OPEN
* IF R7 IS POPULATED R4 MUST BE OPEN. ** MODE/SYNC PIN IS CLOCK OUTPUT WHEN R7 IS POPULATED.
0
FSW = 2MHz
CONNECT BY VOUT
SENSE ONLY
VIN EMI
VIN EMI
R6
OPEN
100k
2.25V - 5.5V
NOTES: UNLESS OTHERWISE SPECIFIED 1. RESISTORS: OHMS, 0402, 1%, 1/16W 2. CAPACITORS: 0402
SG_INPUT
I_STEP
OPTIONAL TRANSIENT RESPONSE CIRCUIT
20V MAX
VIN
VIN
VIN
VIN
GND_A
VIN
GND
GND_A
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
11
NC
MM
LTC3311S
DC3018A 710-DC3018A_REV02
705-DC3018A_REV02
Wednesday, February 12, 2020
5V, 12.5A SYNCHRONOUS STEP-DOWN SILENT SWITCHER 2
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
11
NC
MM
LTC3311S
DC3018A 710-DC3018A_REV02
705-DC3018A_REV02
Wednesday, February 12, 2020
5V, 12.5A SYNCHRONOUS STEP-DOWN SILENT SWITCHER 2
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
11
NC
MM
LTC3311S
DC3018A 710-DC3018A_REV02
705-DC3018A_REV02
Wednesday, February 12, 2020
5V, 12.5A SYNCHRONOUS STEP-DOWN SILENT SWITCHER 2
C23 0.1uF
0201
STNCL1 TOOL, STENCIL, DC3018A REV02
E15
JP1
TP2
E19
E5
E13
C17
10uF 0603
R12
15k
MP1 STANDOFF,NYLON,SNAP-ON,0.50"
C10
OPT
R6
100k
R3
OPT
C14
10uF 0603
MP4 STANDOFF,NYLON,SNAP-ON,0.50"
TPB1
E9
E12
E7
R2 249k
C12
OPT
E20
E2
C9
0.033uF
R8 20
C3
22uF 0805
E11
TP3
R15
10k 5%
C2
22uF 0805
C20
0.22uF
Q1
SUD50N04-8m8P
2
1
3
R11
100k
5%
E10
R4
0
MP3 STANDOFF,NYLON,SNAP-ON,0.50"
TP1
C21
1uF
C22
0.1uF 0201
L1_1
C8
47uF
0805
L1
0.1uH
XEL4030-101MEB
E17
R9
140k
+
C18 470uF
6TPE470MI
E18
C6 47uF
0805
E14
C4
6.8pF
E4
C13
10uF 0603
PCB1 PCB, DC3018A REV02
L2
100 OHMS@100MHz
LB1 LABEL
R1
1M
R13
0
TPA1
E1
R14 0.05
2818 10W
E6
C5 47uF
0805
C16 10uF 0603
E3
MP2 STANDOFF,NYLON,SNAP-ON,0.50"
C11
470pF
+
C1
470uF
6TPE470MI
E21
C15
0.1uF
R5
OPT
U1
LTC3311S-LQFN
EN
1
SW 6
FB 18
ITH
17
MODE/SYNC
13
RT 15
PGOOD 14
SSTT
16
VIN
3
PGND
5
AGND
2
VIN
11
VIN
12
VIN
4SW 7
SW 8 SW 9
PGND
19
PGND
10
C7
0.1uF
R7
OPT
E16 R10
100k
E8
C19
0.22uF
VOUT
VFB
RT
VFBRT
SW VOUT
MODE
SW
MODE
VOUT VIN

10
DEMO MANUAL DC3018A
Rev. 0
 ANALOG DEVICES, INC. 2020
09/20
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation
Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)
and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to
Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted
is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third
Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is
NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS
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DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
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HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
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