Analog Devices DC2745A Quick setup guide

1
DEMO MANUAL DC2745A
Rev. 0
DESCRIPTION
LTC3309A
5V, 6A Synchronous Step-Down
Silent Switcher in 2mm × 2mm LQFN
Demonstration Circuit 2745A features the LTC
®
3309A 5V,
6A synchronous step-down silent switcher operating as
a 2MHz, 3.3V to 1.2V 6A buck regulator. The LTC3309A
supports adjustable output voltages from 0.5V to VIN,
and operating frequencies from 1MHz up to 3MHz. The
LTC3309A is a compact, ultralow emission, high effi-
ciency, and high speed synchronous monolithic step-
down switching regulator. A minimum on-time of 22ns
enables high V
IN
to low V
OUT
conversion ratios at high
switching frequencies.
The DC2745A operating mode may be selected as
Burst Mode
®
operation, skip or forced continuous (FC)
mode. Setting JP1 to the FC/SYNC position will allow
the LTC3309A to sync to a clock frequency from 1MHz
to 3MHz. The LTC3309A operates in forced continuous
mode when syncing to an external clock.
The DC2745A is set to a fixed 2MHz frequency by con-
necting 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 LTC3309A 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 DC2745A 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 LTC3309A 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 LTC3309A 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 6 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% FB resistors.

2
DEMO MANUAL DC2745A
Rev. 0
CIRCUIT SCHEMATIC
BOARD PHOTO
1µF
0201
10nF
dc2745a T01a
EN SW
SW
VIN
VIN
VIN
PGND
140k6.8pF
10µF
10µF
220nH
100k
47µF
x2
V
OUT
1.2V
6A
V
IN
= 2.25V TO 5.5V
FB
AGND
PGOOD
LTC3309A
1µF
0201
MODE/SYNC
RT
f
OSC
= 2MHz
High Efficiency, 2MHz, 1.2V 6A Step-Down Converter LTC3309A 3.3V to 1.2V Efficiency and
Powerloss DC2745A in Burst Mode
V
IN
= 3.3V
V
OUT
= 1.2V
f
SW
= 2MHz
EFFICIENCY
POWER LOSS
XFRMS INC. XFHCL43LT–R22
LOAD CURRENT (mA)
0.001
0.01
0.1
1
6
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)
DC2745A TA01b

3
DEMO MANUAL DC2745A
Rev. 0
EMI TEST RESULTS
CISPR25 Conducted Emisions with Class 5 Peak Limits (Voltage Method)
Radiated EMI Performance (CISPR25 Radiated
Emisions Test with Class 5 Peak Limits)
Radiated EMI Performance (CISPR25 Radiated
Emisions Test with Class 5 Peak Limits)
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
60
50
40
30
20
10
–20
–10
0
dc2745a G01
0 50 9030 70
110
10040 8020 6010
PEAK LIMIT
PEAK
DC2745A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, fSW = 2MHz
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
50
5
45
35
25
15
40
30
20
10
0
dc2745a G02
0 500 900300 700
1000
400 800200 600100
HORIZONTAL POLARIZATION
PEAK DETECTOR
PEAK LIMIT
PEAK
DC2629A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f
SW
= 2MHz
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
50
5
45
35
25
15
40
30
20
10
0
dc2745a G03
0 500 900300 700
1000
400 800200 600100
VERTICAL POLARIZATION
PEAK DETECTOR
PEAK LIMIT
PEAK
DC2745A DEMO BOARD
(WITH EMI FILTER INSTALLED)
3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f
SW
= 2MHz
Load Transient Response Forced Continuous Mode
3.3V
IN TO 1.2V
OUT
LOADSTEP 1.2A TO 4.8A 1A/µs
20µs/DIV
V
SG_INPUT
2V/DIV
V
OUT
50mV/DIV
V
RSNS
200mV/DIV
dc2745a G04
LTC3309A Load Regulation
VIN = 3.3V
VOUT = 1.2V
FORCED CONTINUOUS MODE
IOUT (A)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
1.190
1.192
1.194
1.196
1.198
1.200
1.202
1.204
1.206
1.208
1.210
VOUT (V)
dc2745a G05

4
DEMO MANUAL DC2745A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2745A is easy to set up and use
to evaluate the performance of the LTC3309A. 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 V
OUT
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 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
coupled, 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 6A 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. Settheloadtoa constant 3A.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
(~500nanoseconds).
9. Set the load current to 0.5A and repeat step 8. Observe
that the switching waveform is now operating in Pulse
Skip 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 is desired, set
PS1 to 0V. Move JP1 to FC/SYNC or BURST. Repeat
steps 3 through 9. In step 9 observe that the switch-
ing waveform is now operating in forced continuous
or Burst Mode.
12. To change the frequency, remove R9 if installed.
Install the desired RT resistor in the R4 location. Size
the inductor and output capacitors to provide the
desired inductor ripple and a stable output. Refer to
the LTC3309A 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 be-
tween 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,
VRSNS/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 shown in Figure 3:
IOUT = VRSNS/100mΩ (2)
where
VRSNS = VSG_INPUT − VGS (3)
16. When done, turn off PS1 and Load. Remove all con-
nections to demo board.

5
DEMO MANUAL DC2745A
Rev. 0
QUICK START PROCEDURE
Figure1. Test Setup for the DC2745A Demo Board

6
DEMO MANUAL DC2745A
Rev. 0
QUICK START PROCEDURE
TP1
VOUT
V
OUT
5
4
1 2 3
6 7 8
Q1
SIR426DP-T1-GE3
R10
10k
5%
R11
0.1k
2W
2512
SG_INPUT
20V MAX
E19
E20 RSNS
DC2745A F03
TP2
ISTEP
Figure3. Optional Transient Response Circuit
Figure2. Technique for Measuring Output Ripple and Step Response
a) With a Scope Probe.
b) With a Low Inductance Connector (Not Supplied).

7
DEMO MANUAL DC2745A
Rev. 0
THEORY OF OPERATION
Introduction to the DC2745A
The DC2745A demonstration circuit features the
LTC3309A, a low voltage synchronous step-down silent
switcher. The LTC3309A 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. If the EN pin is low, the LT3309A
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
skip, forced continuous, or Burst Mode. 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
LTC3309A switching frequency will sync to the external
clock while operating in forced continuous mode. See
the LTC3309A 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
V
OUT
to V
IN
. The maximum allowable operating frequency
may be calculated using a minimum tON of 42ns in the
formula below.
fSW(MAX) =VOUT
VIN(MAX) • tON(MIN)
Select an operating switching frequency below fSW(MAX).
The recommended ripple current in the output inductor is
1.8A peak-to-peak for the LTC3309A. This determines the
recommended inductor value for the application.
Accurately Measuring Output Ripple of the LTC3309A
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 caps 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 cap C4. These pads can also be
used to solder a coax cable or other oscilloscope probe
connector if desired.
The high frequency spikes are partially attributed to the
inter-winding 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
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 caps, trace inductance, and load decou-
pling caps and will also help to reduce the ripple. Below is
the output ripple using a 500MHz scope, 50Ω probe with
C4 and C5 reduced to 22µF 0603 caps. The capacitors near
the VOUT turret on the bottom of the board were also popu-
lated 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.
500ns/DIV
10mV/DIV 29mV
dc2745a G06
VIN = 3.3V
VOUT = 1.2V
I
OUT
= 6A
500ns/DIV dc2745a G07
VIN = 3.3V
VOUT = 1.2V
IOUT = 6A
C4, C5 = 22µF 0603
C17 = 1µF 0402
C18, C19 = 10µF 0603
10mV/DIV 9mV

8
DEMO MANUAL DC2745A
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., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC
3 2 C4, C5 CAP., 47µF, X6S, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BC6476MG-T
4 1 C6 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A
5 2 C15, C16 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D
6 1 L1 IND., 0.22µH, PWR, SHIELDED, 20%, 8A, 13mΩ,
2.5mmx2.0mm, SMD
XFMRS, INC., XFHCL43LT- R22M
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, 6A LOW VOLTAGE MONOLITHIC SYNC, LQFN-12(2x2) LINEAR TECH., LTC3309AEV#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, 25V, 10%, 0402, AEC-Q200 MURATA, GCM155R71E104KE02D
3 2 C10, C11 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC
4 2 C13, C14 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, 30A, 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., 1M, 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" THICK 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" THICK 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, 1x4, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000411121
5 1 JP2 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, 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 DC2745A
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
-6 PRODUCTION MM 06-11-19
HI LO
1.2V 6A
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
5V, 6A SYNCHRONOUS STEP-DOWN SILENT SWITCHER
FSW=2MHz
GND
5.5V MAX
OPTIONAL EMI FILTER
ISTEP
RSNS
SG_INPUT
OPTIONAL TRANSIENT RESPONSE CIRCUIT
VOUT
20V MAX
VIN
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
LTC3309A
700-DC2745A_REV07
710-DC2745A_REV06
705-DC2745A_REV06
N/A
06-11-19
DC2745A
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
LTC3309A
700-DC2745A_REV07
710-DC2745A_REV06
705-DC2745A_REV06
N/A
06-11-19
DC2745A
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
LTC3309A
700-DC2745A_REV07
710-DC2745A_REV06
705-DC2745A_REV06
N/A
06-11-19
DC2745A
E20
R1 140k
E8
E2
R8 100k
R6
1M
R3 20
E17
R9 0
PCB1 PCB, DC2745A REV06
E10
C13 1uF 0201
MP1 STANDOFF,NYLON,SNAP-ON,0.50"
E13
JP1
R5
10k
E12
JP2
C4
47uF 0805
MP4 STANDOFF,NYLON,SNAP-ON,0.50"
C12 OPT
E21
R10
10k
5%
C1
0.01uF
0201
E7
E14
C3
10uF
0603
E4
C18
OPT
0805
C6
6.8pF
R11 0.1 2W 2512
C11
10uF 0603
C9
0.1uF
E19
C5
47uF
0805
E18
+
C8
330uF
MP3 STANDOFF,NYLON,SNAP-ON,0.50"
R4
OPT
E3 E1
TP1
TP3
C17 OPT
STNCL1 TOOL, STENCIL, 700-DC2745A REV06
E16
C15 1uF 0201
R7
249k
C14
1uF 0201
C19
OPT
0805
LB1 LABEL
E11
TPB1
E15
E9
U1
LTC3309A-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
C10
10uF 0603
TP2
MP2 STANDOFF,NYLON,SNAP-ON,0.50"
L1
0.22uH
XFHCL43LT-R22M
TPA1
E5
E6
+
C7
330uF
L2
100 OHMS@100MHz
74279226101 C2
10uF
0603
R2
100k
Q1 SIR426DP-T1-GE3
5
6
1
7
4
2
38
C16 1uF 0201
RT
RT
VOUT
VOUT

10
DEMO MANUAL DC2745A
Rev. 0
 ANALOG DEVICES, INC. 2019
12/19
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.