Analog Devices DC2990A User manual

1
DEMO MANUAL DC2990A
Rev. 0
DESCRIPTION
LTC3307A
5V Input to 1.2V Output at 3A Synchronous
Step‑Down Silent Switcher Demo Circuit
Demonstration circuit 2990A features the LTC
®
3307A
5V, 3A synchronous step-down Silent Switcher
®
oper-
ating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The
LTC3307A supports adjustable output voltages from
0.5V to VIN with operating frequencies from 1MHz up to
3MHz. The LTC3307A is a compact, ultralow emission,
high efficiency, and high speed synchronous monolithic
step-down switching regulator. A minimum on-time of
22ns enables high VIN to low VOUT conversion ratios at
high frequencies.
The DC2990A operating mode may be selected as Burst,
Skip or forced continuous (FC) mode. Setting JP1 to the
FC/SYNC position will allow the LTC3307A to sync to
a clock frequency from 1MHz to 3MHz. The LTC3307A
operates in forced continuous mode when syncing to an
external clock. The DC2990A 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 LTC3307A 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 DC2990A 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 LTC3307A 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 LTC3307A 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 3 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 DC2990A
Rev. 0
BOARD PHOTO
CIRCUIT SCHEMATIC
High Efficiency, 2MHz, 1.2V 3A Step-Down Converter Efficiency and Power Loss
in Burst Mode Operation
1µF
0201
EN SW
SW
VIN VIN
PGND
140k10pF
4.7µF
4.7µF
470nH
100k
15µF
x2
VOUT
1.2V
3A
VIN = 2.25V TO 5.5V
FB
AGND
PGOOD
LTC3307A
1µF
0201
MODE/SYNC
RT
fOSC = 2MHz
VIN
10nF
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)

3
DEMO MANUAL DC2990A
Rev. 0
EMI TEST RESULTS
Conducted EMI Performance (CISPR25 Conducted Emission Test
with Class 5 Peak Limits)
DC2990A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f
SW
= 2MHz
CLASS 5 PEAK LIMIT
MEASURED EMISSIONS
RADIATED 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)
dc2990a G01
DC2990A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, 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)
dc2990a G02
DC2990A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 2.4A, 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)
dc2990a G03
Radiated EMI Performance (CISPR25 Radiated Emission Test
with Class 5 Peak Limits)
Forced Continuous Mode
3.3V
IN TO 1.2V
OUT
LOADSTEP 0.6A TO 2.4A 1A/µs
10µs/DIV
V
SG_INPUT
2V/DIV
VOUT 1.2V
20mV/DIV
V
RSNS
100mV/DIV
dc2990a 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
1.190
1.192
1.194
1.196
1.198
1.200
1.202
1.204
1.206
1.208
1.210
VOUT (V)
LTC3307A Load Regulation
dc2990a G05
Load Transient Response Forced Continuous Mode LTC3307A Load Regulation
dcXXXXa F00

4
DEMO MANUAL DC2990A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2990A is easy to set up and evalu-
ate the performance of the LTC3307A. 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 tur-
rets 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 oscillo-
scope 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 EMI.
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 Figure2. 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 1.5A. 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 0.2A and repeat Step 8. Observe
that the switching waveform is now operating in pulse-
skippping 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 LTC3307A 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:
VRSNS = VSG_INPUT − VGS
16. When done, turn off PS1 and Load. Remove all
connections to the demo board.

5
DEMO MANUAL DC2990A
Rev. 0
QUICK START PROCEDURE
Figure1. Test Setup for the DC2990A 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 DC2990A
Rev. 0
Introduction to the DC2990A
The DC2990A features the LTC3307A, a low voltage syn-
chronous step-down Silent Switcher. The LTC3307A 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 LTC3307A 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 LTC3307A switching frequency will sync to
Figure4. Optional Transient Response Circuit
QUICK START PROCEDURE
THEORY OF OPERATION
the external clock while operating in forced continuous
mode. See the LTC3307A data sheet for more detailed
information.
The maximum allowable operating frequency is influenced
by the minimum on-time of the top switch, the ratio of
VOUT to VIN and the available inductor values. The maxi-
mum allowable operating frequency may be calculated
using a minimum TON of 42ns in Equation 1.
fSWMAX =
V
OUT
V
INMAX
•TON
MIN
(1)
Select an operating switching frequency below fSWMAX.
The recommended ripple current in the output inductor is
0.9A peak-to-peak for the LTC3307A. This determines the
recommended inductor value for the application.

7
DEMO MANUAL DC2990A
Rev. 0
THEORY OF OPERATION
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
Figure5.
Figure6.
TP1
50Ω PROBE
V
IN
= 3.3V
V
OUT
= 1.2V
I
OUT
= 3A
500ns/DIV
1.2V
10mV/DIV
dc2990a F05
TP3
50Ω PROBE
V
IN
= 3.3V
V
OUT
= 1.2V
I
OUT
= 3A
C4, C5 = 22µF 0603
C17 = 1µF
C18, SC19 = 10µF 0603
500ns/DIV
1.2V
10mA/DIV
dc2990a F06
Accurately Measuring Output Ripple of the LTC3307A
With the fast edge rates of the circuit, high frequency
noise can be observed when measuring the output voltage
with 1MΩ terminated oscilloscope probes. To better view
the output ripple with oscilloscopes of 400MHz band-
width 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 dis-
playing on the scope. The demo board is set up to solder
an U.FL,RECEPT, ST SMD, 0Hz to 6GHz 50Ω connector
(TP1) near the output capacitor C4. These pads can also
be used to solder a coax cable or other oscilloscope probe
connector if desired.
to the output capacitors as close to the inductor as pos-
sible. Adding capacitors close to the load creates a π filter
between the output capacitors, trace inductance, and load
decoupling capasitors and 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
capacitors. 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.

8
DEMO MANUAL DC2990A
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., 22μF, X6S, 6.3V, 20%, 0603 MURATA, GRM188C80J226ME15D
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., 0.47μH, POWER, 20%, 3.4A, 0.032Ω, 0805 MURATA, DFE201210S-R47M=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, CRCW0402100KFKED
9 1 U1 IC, 5V, 3A SYNCHRONOUS STEP-DOWN Silent Switcher,
12-PIN 2×2 LQFN
ANALOG DEVICES, LTC3307AEV#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., 80Ω, FERRITE BEAD, 25%, 4A, 0.018Ω, 0805, 100MHz WURTH ELEKTRONIK, 74279220800
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 NIC, NRC04F20R0TRF
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 DC2990A
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 09-20-19
HI LO
1.2V 3A
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
0603 0603
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
LTC3307A
700-DC2990A_REV02
710-DC2990A_REV02
705-DC2990A_REV02
N/A
09-20-19
DC2990A
5V, 3A 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
LTC3307A
700-DC2990A_REV02
710-DC2990A_REV02
705-DC2990A_REV02
N/A
09-20-19
DC2990A
5V, 3A 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
LTC3307A
700-DC2990A_REV02
710-DC2990A_REV02
705-DC2990A_REV02
N/A
09-20-19
DC2990A
5V, 3A SYNCHRONOUS STEP-DOWN SILENT SWITCHER
E13
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
Q1 SIR426DP-T1-GE3
5
6
1
7
4
2
38
TP3
MP4 STANDOFF,NYLON,SNAP-ON,0.50"
E11
C5
22uF
E19
LB1 LABEL
R2
100k
E10
C19
OPT
0805
+
C8
330uF
6TPE330ML C9
0.1uF
TP2
C3
4.7uF
PCB1 PCB, DC2990A REV02
E14
C18
OPT
C10
10uF 0603
R7
249k
R10
10k
5%
C15 1uF 0201
E6
STNCL1 TOOL, STENCIL, 700-DC2990A REV02
C17 OPT
E5
C16 1uF 0201
C11
10uF 0603
U1
LTC3307A-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
C4
22uF
E18
E20
R9 0
E9
C1
0.01uF
0201
C2
4.7uF
E17 E1
L1
0.47uH
DFE201210S-R47M=P2
JP2
R3 20
C13 1uF 0201
R6
1M
E3
L2
80OHM
74279220800
C14
1uF 0201
R11 0.1 2W 2512
C6
10pF
TPA1
E12
E7
JP1
R5
10k
E15
R4
OPT
+
C7
330uF 6TPE330ML
TPB1
RT
RT
VOUT
VOUT

10
DEMO MANUAL DC2990A
Rev. 0
 ANALOG DEVICES, INC. 2020
01/20
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 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.