Analog Devices LTC3308A Quick setup guide

1
DEMO MANUAL DC2991A
Rev. 0
DESCRIPTION
LTC3308A
5V Input to 1.2V Output at 4A Synchronous
Step‑Down Silent Switcher Demo Circuit
Demonstration circuit 2991A features the LTC
®
3308A
5V, 4A synchronous step-down Silent Switcher
®
oper-
ating as a 2.0MHz, 3.3V to 1.2V 4A buck regulator. The
LTC3308A supports adjustable output voltages from 0.5V
to VIN with operating frequencies from 1MHz up to 3MHz.
The LTC3308A is a compact, ultralow emission, high
efficiency, and high speed synchronous monolithic step-
down switching regulator. A minimum on-time switching
of 22ns enables high VIN to low VOUT conversion ratios
at high frequencies.
The DC2991A operating mode may be selected as BURST,
SKIP or Forced Continuous (FC) mode. Setting JP1 to
the FC/SYNC position will allow the LTC3308A to sync to
a clock frequency from 1MHz to 3MHz. The LTC3308A
operates in forced continuous mode when syncing to an
external clock. The DC2991A is set to a fixed 2MHz fre-
quency by connecting RT to V
IN
through a 0Ω resistor, R9.
The frequency can be easily changed by removing R9 and
setting an appropriate resistor in the R4 location to obtain
the desired frequency. Refer to the LTC3308A data sheet
for the proper RT value for a desired switching frequency.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
The DC2991A 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 radi-
ated emission tests.
The LTC3308A data sheet gives a complete description
of the device, operation and application information. The
data sheet must be read in conjunction with this demo
manual. The LTC3308A is assembled in a 2mm × 2mm
LQFN package with exposed pads for low thermal resis-
tance. The layout recommendations for low EMI operation
and maximum thermal performance are available in the
data sheet section: Low EMI PCB Layout.
The Efficiency vs Load graph shows the efficiency and
the power loss of the circuit with a 3.3V input in Burst
Mode operation.
Design files for this circuit board are available.
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Voltage Range 2.25 5.5 V
VOUT VOUT Voltage Range* 1.183 1.2 1.217 V
IOUT Output Current 4 A
fSW Switching Frequency VIN Greater than VOUT 1 3 MHz
TON Top Switch Minimum On-Time 22 ns
Duty Cycle Top Switch Duty Cycle 100 %
*With 1% resistors. Accuracy will improve to within 1% using 0.1% resistors.

2
DEMO MANUAL DC2991A
Rev. 0
BOARD PHOTO
High Efficiency, 2MHz, 1.2V 4A Step-Down Converter Efficiency and Power Loss
in Burst Mode Operation
1µF
0201
EN SW
SW
VIN VIN
PGND
140k10pF
10nF
VIN
4.7µF
4.7µF
330nH
100k
33µF
x2
VOUT
1.2V
4A
VIN = 2.25V TO 5.5V
FB
AGND
PGOOD
LTC3308A
1µF
0201
MODE/SYNC
RT
fOSC = 2MHz
V
IN
= 3.3V
V
OUT
= 1.2V
f
SW
= 2 MHz
EFFICIENCY
POWER LOSS
Murata DFE201210S–R47M
LOAD CURRENT (A)
0.001
0.01
0.1
1
3
0
10
20
30
40
50
60
70
80
90
100
0.0001
0.001
0.01
0.1
1
10
EFFICIENCY (%)
POWER LOSS (W)
CIRCUIT SCHEMATIC

3
DEMO MANUAL DC2991A
Rev. 0
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)
Load Transient Response Forced Continuous Mode LTC3308A Load Regulation
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, 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)
dc2991A G01
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, 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)
dc2991A G02
DC2991A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 3.2A, 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)
dc2991A G03
3.3V
IN TO 1.2V
OUT
LOAD STEP 0.8A TO 3.2A 1A/µs
10µs/DIV
V
SG_INPUT
2V/DIV
VOUT
20mV/DIV
V
RSNS
100mV/DIV
dc2991A G04
VIN = 3.3V
VOUT = 1.2V
FORCED CONTINUOUS MODE
IOUT (A)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1.190
1.192
1.194
1.196
1.198
1.200
1.202
1.204
1.206
1.208
1.210
VOUT (V)
dc2991A G05

4
DEMO MANUAL DC2991A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2991A is easy to set up and use
to evaluate the performance of the LTC3308A. Refer to
Figure1 for proper measurement equipment setup and
follow the procedure below.
NOTE:For accurate VIN, VOUT and efficiency measure-
ments, measure VIN at the VIN SNSE and GND SNSE
turrets and VOUT 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.
1. Set the JP1 jumper to the SKIP position and JP2 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.
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.
4. Connect an oscilloscope voltage probe as shown in
Figure2 in parallel with VM2. Set channel to AC cou-
pled, voltage scale to 20mV and time base to 10μs.
Observe the VOUT ripple voltage.
NOTE: Measure the output voltage ripple by touching
the probe tip directly across the output turrets or to
TP1 as shown in . TP1 is designed for a 50Ω coax
cable to reduce any high frequency noise that might
couple into the oscilloscope probes.
5. Verify that PGOOD turret is high.
6. Increasing the load by 1A intervals up to 4A and record
VM1, VM2, AM1 and AM2 for each interval.
7. Repeat Step 6 for PS1 set to 2.5V and again for PS1
set to 5.0V.
8. Set the load to a constant 2A. Remove the oscilloscope
voltage probe from VOUT. Place a ground clip on PGND
terminal and set the voltage scale to 1V and the time
scale to 500ns/Division. Trigger on the rising edge of the
voltage probe. Using a tip on the voltage probe, contact
the SW node on the pad of L1. Observe the duty cycle
and the period of the switching waveform (~500ns).
9. Set the load current to 0.3A and repeat Step 8. Observe
that the switching waveform is now operating in pulse-
skipping mode.
10. Move the jumper on JP2 to LO. Verify that VOUT reads
0V and verify that PGOOD is low. Return jumper on
JP2 to HI and verify VM2 is 1.2V and verify PGOOD2
is high.
11. If forced continuous or Burst Mode operation is
desired, set PS1 to 0V. Move JP1 to FC/SYNC or
BURST. Repeat Steps 3 through 9. In Step 9 observe
that the switching waveform is now operating in
forced continuous or Burst Mode operation.
12. To change the frequency, remove R9 if installed.
Install the desired RTresistor in the R4 location. Size
the inductor and output capacitors to provide the
desired inductor ripple and a stable output. Refer to
the LTC3308A data sheet and LTpowerCAD for more
information on choosing the required components.
13. To test the transient response with a base load, add the
desired resistor to produce a minimum load between
VOUT and RSNS turrets (RL shown on Figure1). Note
that the total load resistance will be RL plus R11
(100mΩ).
14. Adjust a signal generator with a 10ms period, 10%
duty cycle and an amplitude from 1V to 2V to start.
15. Measure the RSNS voltage to observe the current,
RSNS/100mΩ. 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. Refer to the following equations and the optional
transient response circuit.
IOUT = VRSNS/100mΩ
Where:
VSG_INPUT = VSG_INPUT − VGS
16. When done, turn off PS1 and load. Remove all
connections to the demo board.

5
DEMO MANUAL DC2991A
Rev. 0
QUICK START PROCEDURE
Figure1. Test Setup for the DC2991A Demo Board
Figure2. Technique for Measuring Output Ripple
and Step Response with a Scope Probe
Figure3. Technique for Measuring Output Ripple and Step
Response with a Low Inductance Connector (Not Supplied)

6
DEMO MANUAL DC2991A
Rev. 0
THEORY OF OPERATION
Introduction to the DC2991A
The DC2991A features the LTC3308A, a low voltage syn-
chronous step-down Silent Switcher. The LTC3308A is a
monolithic, constant frequency, 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 beginning of each clock cycle. Current in the
inductor then increases until the top switch comparator
trips and turns off the top power switch. If the EN pin is
low, the LTC3308A 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 MODE/SYNC pin sets the switching mode to pulse-
skipping, forced continuous, or Burst Mode operation.
If an external 1MHz to 3MHz clock is connected to the
MODE/SYNC turret while the JP1 is set to the FC/SYNC
position, the LTC3308A switching frequency will sync to
Figure4. Optional Transient Response Circuit
QUICK START PROCEDURE
the external clock while operating in forced continuous
mode. See the LTC3308A data sheet for more detailed
information.
The maximum allowable operating frequency is influenced
by the minimum on-time of the top switch and the ratio
of V
OUT
to V
IN
. The maximum allowable operating fre-
quency may be calculated using a minimum TON of 42ns
in Equation 1.
fSWMAX =
V
OUT
VINMAX •TONMIN
(1)
Select an operating switching frequency below fSWMAX.
The recommended ripple current in the output inductor
is 1.2A peak-to-peak for the LTC3308A. This determines
the recommended inductor value for the inductor.

7
DEMO MANUAL DC2991A
Rev. 0
Accurately Measuring Output Ripple of the LTC3308A
With the fast edge rates of the circuit, high frequency
noise can be observed when measuring the output volt-
age with 1MΩ terminated oscilloscope probes. To bet-
ter view the output ripple with oscilloscopes of 400MHz
bandwidth and above a 50Ω coax cable connected as
close to the output capacitor as possible should be used
with the oscilloscope channel terminated to 50Ω at the
scope. This will help to reduce the noise coupling onto
and displaying on the scope. The demo board is set up to
solder an U.FL,RECEPT,ST SMD, 0Hz to 6GHz 50Ω con-
nector (TP1) near the output capacitor C4. These pads can
also be used to solder a coax cable or other oscilloscope
probe connector if desired.
THEORY OF OPERATION
to the output capacitors as close to the inductor as pos-
sible. Adding capacitors close to the load creating a π
filter between the output caps, trace inductance, and load
decoupling capacitors will also help to reduce the ripple.
Figure6 shows the output ripple using a 500MHz scope,
50Ω probe with C4 and C5 reduced to 22μF 0603 capaci-
tors. The capacitors near the VOUT turret on the bottom
of the board were also populated with C17 = 1μF 0402,
plus C18 and C19 = 10μF 0603 capacitors. The output
ripple was measured at TP3 on the bottom of the board
near the VOUT turrets.
Figure5.
Figure6.
The high frequency spikes are partially attributed to the
interwinding capacitance of the inductor and the voltage
step is partially attributed to the inductance in the output
capacitors. This can be reduced by choosing low ESL
capacitors or adding small low ESL capacitors in parallel
TP1
50Ω PROBE
V
IN
= 3.3V
V
OUT
= 1.2V
I
OUT
= 4A
500ns/DIV
VOUT
10mV/DIV
dc2991a F05
TP3
50Ω PROBE
V
IN
= 3.3V
V
OUT
= 1.2V
I
OUT
= 4A
C4,C5 = 22µF 0603
C17 = 1µF
C18,C19 = 10µF 0603
500ns/DIV
VOUT
10mV/DIV
dc2991A F06

8
DEMO MANUAL DC2991A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., 0.01μF, X7R, 10V, 10%, 0201 MURATA, GRM033R70J103KA01D
2 2 C2, C3 CAP., 4.7μF, X6S, 6.3V, 20%, 0402 MURATA, GRM155C80J475MEAAD
3 2 C4, C5 CAP., 33μF, X5R, 10V, 20%, 0805 TDK, C2012X5R1A336M125AC
4 1 C6 CAP., 10pF, C0G, 50V, 5%, 0402, AEC-Q200 MURATA, GCM1555C1H100JA16D
5 2 C13, C14 CAP., 1μF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D
6 1 L1 IND., 0.33μH, PWR, FIXED, 20%, 6.3A, 21mΩ, 0806 MURATA, DFE201612E-R33M=P2
7 1 R1 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED
8 1 R2 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKvED
9 1 U1 IC, 5V, 4A SYNCHRONOUS STEP-DOWN Silent Switcher, LQFN ANALOG DEVICES, LTC3308AEV#PBF
Additional Demo Board Circuit Components
1 2 C7, C8 CAP., 330μF, TANT. POSCAP, 6.3V, 20%, 7343, 25mΩ, TPE PANASONIC, 6TPE330ML
2 1 C9 CAP., 0.1μF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D
3 2 C10, C11 CAP., 10μF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC
4 2 C15, C16 CAP., 1μF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D
5 1 L2 IND., 100Ω @ 100MHz, FERRITE BEAD, 25%, 8A, 6mΩ, 1812 WURTH ELEKTRONIK, 74279226101
6 1 Q1 XSTR., MOSFET, N-CH, 40V, 15.9A, PPAK SO-8 VISHAY, SIR426DP-T1-GE3
7 1 R3 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED
8 1 R5 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
9 1 R6 RES., 1MΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED
10 1 R7 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED
11 1 R8 RES., 100k, 5%, 1/16W, 0402 YAGEO, RC0402JR-07100KL
12 1 R9 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED
13 1 R10 RES., 10k, 5%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GEJ103X
14 1 R11 RES., 0.1Ω, 1%, 2W, 2512, SENSE, AEC-Q200 IRC, LRC-LR2512LF-01-R100-F
Hardware: For Demo Board Only
1 10 E1-E3, E5, E12, E14-E16,
E19, E21
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, E11, E13, E18, E20 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-E10, E17 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,
SWAGE, 0.218"
KEYSTONE, 575-4
4 1 JP1 CONN., HDR, MALE, 1×4, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000411121
5 1 JP2 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121
6 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000
7 0 TP1, TP3 CONN., U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50Ω HIROSE ELECTRIC, U.FL-R-SMT-1(10)
8 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

9
DEMO MANUAL DC2991A
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
REVISION HISTORY
ECO REV DESCRIPTION APPROVED DATE
-2 PRODUCTION MM 09-19-19
HI LO
1.2V 4A
2.25V - 5.5V
VOUT
MODE/SYNC
GND
EN
PGOOD
GND
MODE/SYNC
VIN
GND
EN
VIN
GND
VOUT
GND
VOUT
SNSE
GND
SNSE
VIN
SNSE
GND
SNSE
FC/SYNC
BURST
SKIP
PCA ADDITIONAL PARTS
NOTES: UNLESS OTHERWISE SPECIFIED 1. RESISTORS: OHMS, 0402, 1%, 1/16W 2. CAPACITORS: 0402
VIN EMI
VIN EMI
2.25V - 5.5V
FSW=2MHz
GND
5.5V MAX
OPTIONAL EMI FILTER
ISTEP
RSNS
SG_INPUT
OPTIONAL TRANSIENT RESPONSE CIRCUIT
VOUT
20V MAX
VIN
VIN
VIN
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 = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
Phone: [phone]
www.linear.comwww.analog.com
11
NC
MM
LTC3308A
700-DC2991A_REV02
710-DC2991A_REV02
705-DC2991A_REV02
N/A
09-19-19
DC2991A
5V, 4A SYNCHRONOUS STEP-DOWN SILENT SWITCHER
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 = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
Phone: [phone]
www.linear.comwww.analog.com
11
NC
MM
LTC3308A
700-DC2991A_REV02
710-DC2991A_REV02
705-DC2991A_REV02
N/A
09-19-19
DC2991A
5V, 4A SYNCHRONOUS STEP-DOWN SILENT SWITCHER
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 = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
Phone: [phone]
www.linear.comwww.analog.com
11
NC
MM
LTC3308A
700-DC2991A_REV02
710-DC2991A_REV02
705-DC2991A_REV02
N/A
09-19-19
DC2991A
5V, 4A SYNCHRONOUS STEP-DOWN SILENT SWITCHER
E13
U1
LTC3308A-LQFN
EN
2
SW 5
VFB 12
MODE/SYNC
9
RT 10
PGOOD 11
VIN
3
PGND
7
AGND
1
VIN
8
SW 6
PGND
4
PGND
13
MP1 STANDOFF,NYLON,SNAP-ON,0.50"
E16
R8 100k
E21
MP3 STANDOFF,NYLON,SNAP-ON,0.50"
E2
E8
TP1
MP2 STANDOFF,NYLON,SNAP-ON,0.50"
R1 140k
E4
C12 OPT
C4
33uF
0805
Q1 SIR426DP-T1-GE3
5
6
1
7
4
2
38
MP4 STANDOFF,NYLON,SNAP-ON,0.50"
C19
OPT
0805
E11
C2
4.7uF
E19
LB1 LABEL
R2
100k
C18
OPT
0805 E10
+
C8
330uF 6TPE330ML
C9
0.1uF
C3
4.7uF
TP2
E14
C17 OPT
C10
10uF 0603
R7
249k
R10
10k
5%
C15
1uF 0201
L1
0.33uH
DFE201612E-R33M=P2
E6
E5
C11
10uF 0603
E18
PCB1 PCB, DC2991A REV02
C16
1uF 0201
E20
R9 0
E9
C1
0.01uF
0201
C5
33uF
0805
E17 E1
STNCL1 TOOL, STENCIL, DC2991A REV02
JP2
R3 20
C13 1uF 0201
TP3
R6
1M
E3
L2
100 OHMS@100MHz
74279226101
R11 0.1 2W 2512
C14
1uF 0201 C6
10pF
TPA1
E12
E7
R5
10k
JP1
E15
R4
OPT
+
C7
330uF 6TPE330ML
TPB1
RT
RT
VOUT
VOUT

10
DEMO MANUAL DC2991A
Rev. 0
 ANALOG DEVICES, INC. 2020
01/20
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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
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
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
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.