Analog Devices DC2779A Quick setup guide

1
DEMO MANUAL DC2779A
Rev. 0
DESCRIPTION
LT8644S
8V, 16A Synchronous Step-Down
Silent Switcher 2
Demonstration circuit 2779A is an 8V, 16A synchronous
step-down Silent Switcher
®
2 with spread spectrum fre-
quency modulation featuring the LT
®
8644S. The demo
board is designed for 1.2V output from a 2.7V to 8V input.
The LT8644S is a compact, ultralow emission, high effi-
ciency, and high speed synchronous monolithic step-
down switching regulator. The integrated bypass capaci-
tors optimize all the fast current loops and make it easier
to minimize EMI emissions by reducing layout sensitivity.
Selectable spread spectrum mode further improves EMI
performance, making it perfect solution to the noise sen-
sitive applications.
Peak current mode control with minimum on-time of as
low as 20ns allows high step-down conversion even at
high frequency. The LT8644S switching frequency can be
programmed either via an external resistor or an external
clock over a 300kHz to 3.5MHz range. The default fre-
quency of demo circuit 2779A is 2MHz.
The SYNC/MODE pin on the demo board DC2779A is
grounded (JP1 at BURST position) by default for low
ripple Burst Mode
®
operation. It can be configured into
different operation modes through JP1 and SYNC termi-
nal (Table1).
Table1. Operation Mode Configuration
JP1 Position SYNC (E5) Input Operation Mode
SPREAD-SPECTRUM N/A Forced Continuous Mode with
Spread-Spectrum
BURST N/A Low Ripple Burst Mode
FCM/SYNC Floating Forced Continuous Mode
without Spread-Spectrum
FCM/SYNC External Clock Forced Continuous Mode with
Synchronization
All registered trademarks and trademarks are the property of their respective owners.
Figure4 shows the efficiency of the circuit at 3.3V input
and 5V input in force continuous mode operation (input
from VIN terminal). To get accurate efficiency measure-
ment, measure the input voltage at the VIN_SENSE/GND
terminals and measure the output voltage at the VOUT+
SENSE/VOUT–SENSE terminals. Figure 5 shows the
LT8644S temperature rise on DC2779A demo board at
3.3V input and 5V input in forced continuous mode.
The LT8644S is assembled in a 4mm × 4mm LQFN pack-
age with exposed pads for low thermal resistance. The
rated maximum continuous load current is 16A, while
derating may be necessary for certain input voltage and
thermal conditions.
The demo board has an EMI filter installed. This EMI
filter can be included by applying the input voltage at
the VEMI terminal. The EMI performance of the board
(with EMI filter) is shown on Figure6. The red lines in
EMI Performance are CISPR25 Class 5 limits. The figure
shows that the LT8644S circuit passes the test with a
wide margin. To achieve EMI performance as shown in
Figure6, the input EMI filter is required and the input
voltage should be applied to VEMI terminal, and the test
setup can be referred to the CISPR25 standards. If the
input is applied to VIN terminal, the EMI filter is bypassed.
The LT8644S data sheet gives a complete description of
the part, the operation and application information. The
data sheet must be read in conjunction with this demo
manual for demo circuit 2779A. The layout recommen-
dations for low EMI operation and maximum thermal
performance are available in the data sheet section Low
EMI PCB Layout and Thermal Considerations. Contact ADI
applications engineer for support.
Design files for this circuit board are available.
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2
DEMO MANUAL DC2779A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2779A is easy to set up to evalu-
ate the performance of the LT8644S. Refer to Figure1
for proper measurement equipment setup and follow the
procedure below:
NOTE. 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 capacitor.
See Figure2 for the proper scope technique.
1. Make sure the Jump JP1 is on the BURST position.
Refer to the schematic.
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 VEMI and GND.
3. Withpoweroff,connecttheloadfromVOUT+toVOUT–.
4. Connect the voltage meter across the VIN_SENSE and
GND for VIN measurement, and VOUT+ SENSE and
VOUT– SENSE for VOUT measurement.
5. Turn on the power at the input.
NOTE:Make sure that the input voltage does not exceed 8V.
6. Check for the proper output voltage (VOUT = 1.2V).
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high or is
shorted.
7. Once the proper output voltage is established, adjust
the load within the operating ranges and observe the
outputvoltageregulation,ripplevoltage,efficiency,and
other parameters.
8. An external clock can be added to the SYNC terminal
when SYNC function is used (JP1 on the FCM/SYNC
position). Please make sure that R2 should be chose
to set the LT8644S switching frequency equal to or
below the lowest SYNC frequency. When JP1 is in FCM/
SYNC position and no external clock is connected to
the SYNC terminal of the board, the SYNC/MODE pin
is floating and the LT8644S runs in forced continuous
mode. JP1 can also set LT8644S in spread spectrum
mode (JP1 on the SPREAD-SPECTRUM position).
9. To test the transient response, connect a signal
generator to PULSE GEN terminal, and add a desired
base load between VOUT+ and VOUT– (LOAD shown
on Figure1). Adjust the signal generator with a 2ms
period, 5% duty cycle and an amplitude from 1V to 2V
to start. Measure the LOAD STEP voltage to observe
thecurrent(ILOADSTEP =VLOAD_STEP/10mΩ).Adjustthe
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
4A to 12A. The 4A base load is added between VOUT+
and VOUT–, while the 8A step load is controlled by
the signal generator at PULSE_GEN and measured at
LOAD_STEP with 0.01V/A ratio.
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 2.7 8 V
VOUT Output Voltage VIN = 5V 1.18 1.2 1.22 V
IOUT Maximum Continuous Output Current 16 A
fSW Switching Frequency 1.95 2 2.05 MHz
EFF Efficiency VIN = 5V, VOUT = 1.2V, IOUT = 8A 90.2 %
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3
DEMO MANUAL DC2779A
Rev. 0
QUICK START PROCEDURE
Figure1. Proper Measurement Equipment Setup
Figure3. LT8644S Demo Circuit DC2779A Transient Response (VIN = 5V, 4A to 12A Load Step)
20µs/DIV
LOAD_STEP
5A/DIV
V
OUT
50mV/DIV
PULSE_GEN
2V/DIV
DC2779A F03
Figure2. Measuring Output Ripple at Output Capacitor C9
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4
DEMO MANUAL DC2779A
Rev. 0
QUICK START PROCEDURE
Figure4. LT8644S Demo Circuit DC2779A Efficiency vs Load Current
Figure5. LT8644S Demo Circuit DC2779A Case Temperature Rise vs Load Current
POWER LOSS
EFFICIENCY
V
IN
= 3.3V
V
IN
= 5V
LOAD CURRENT (A)
2
4
6
8
10
12
14
16
50
55
60
65
70
75
80
85
90
95
100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
EFFICIENCY (%)
POWER LOSS (W)
DC2779A F01
FORCED CONTINUOUS MODE
L = XEL5030, 0.13µH
V
OUT
= 1.2V, f
SW
= 2MHz
FORCED CONTINUOUS MODE
V
IN
= 3.3V
V
IN
= 5V
LOAD CURRENT (A)
2
4
6
8
10
12
14
16
0
10
20
30
40
50
60
70
80
CASE TEMPERATURE RISE (°C)
DC2779A F02
ROOM CONDITION
STILL AIR
L = XEL5030, 0.13µH
V
OUT
= 1.2V, f
SW
= 2MHz
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5
DEMO MANUAL DC2779A
Rev. 0
QUICK START PROCEDURE
Figure6. LT8644S Demo Circuit DC2779A EMI Performance
Conducted EMI Performance
(CISPR25 Conducted Emission Test with Class 5 Peak Limits)
Radiated EMI Performance
(CISPR25 Radiated Emission Test with Class 5 Peak Limits)
VOLTAGE METHOD
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQEUNCY MODE
FREQUENCY (MHz)
0
3
6
9
12
15
18
21
24
27
30
–20
–10
0
10
20
30
40
50
60
70
80
AMPLITUDE (dBµV)
DC2779A F03a
VERTICAL POLARIZATION
PEAK DETECTOR
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµV/m)
DC2779A F03b
DC2779A DEMO BOARD
(WITH EMI FILTER INSTALLED)
5V INPUT TO 1.2V OUTPUT AT 16A, f
SW
= 2MHz
HORIZONTAL POLARIZATION
PEAK DETECTOR
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
FREQUENCY (MHz)
0
100
200
300
400
500
600
700
800
900
1000
–5
0
5
10
15
20
25
30
35
40
45
50
AMPLITUDE (dBµV/m)
DC2779A F03c
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6
DEMO MANUAL DC2779A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C2, C12 CAP., 10µF, X5R, 16V, 10%, 0603 MURATA, GRM188R61C106KAALD
2 1 C5 CAP., 390pF, C0G/NP0, 50V, 5%, 0603 AVX, 06035A391JAT2A
3 2 C6, C19 CAP., 220µF, X5R, 4V, 20%, 1206 MURATA, GRM31CR60G227ME11L
4 1 C8 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104KAT2A
5 2 C9, C20 CAP., 22µF, X5R, 4V, 20%, 0603 MURATA, GRM188R60G226MEA0D
6 1 C16 CAP., 33pF, C0G, 50V, 5%, 0603 AVX, 06035A330JAT2A
7 2 C17, C26 CAP., 22µF, X7R, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L
8 1 C21 CAP., 1µF, X7R, 16V, 10%, 0603 AVX, 0603YC105KAT2A
9 1 L1 IND., 0.13µH, PWR, 20%, 35A, 1.83mΩ, 5.48mm × 5.28mm COILCRAFT, XEL5030-131MEB
10 4 R1, R3, R5, R7 RES., 100k, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA
11 1 R2 RES., 16.9k, 1%, 1/10W, 0603 VISHAY, CRCW060316K9FKEA
12 1 R4 RES., 13.3k, 1%, 1/10W, 0603 VISHAY, CRCW060313K3FKEAC
13 1 R8 RES., 1Ω, 1%, 1/10W, 0603 VISHAY, CRCW06031R00FKEA
14 1 U1 IC, STEP-DOWN SWITCHER, LQFN-24 (4mm × 4mm) ANALOG DEVICES., LT8644SIV#TRMPBF
Additional Demo Board Circuit Components
1 1 C1 CAP., 100µF, ALUM. ELECT., 16V, 20%, 6.3mm × 5.4mm SUN ELECTRONIC INDUSTRIES CORP, 16CE100BS
2 2 C3, C10 CAP., 22µF, X7R, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L
3 0 C7, C15, C23 (OPT) CAP., OPTION, 0603
4 1 C14 CAP., 1µF, X5R, 25V, 10%, 0402 MURATA, GRM155R61E105KA12D
5 0 C22 (OPT) CAP., OPTION, 0805
6 0 C24 (OPT) CAP., OPTION, 1206
7 1 C25 CAP., 4.7µF, X7S, 10V, 10%, 0603 MURATA, GRM188C71A475KE11D
8 1 FB1 IND., 10Ω AT 100MHz, FERRITE BEAD, 25%, 10.5A, 3mΩ, 1206 WURTH ELEKTRONIK, 74279221100
9 0 L2 (OPT) IND., OPTION
10 1 Q1 XSTR., MOSFET, N-CH, 40V, 14A, DPAK (TO-252) VISHAY, SUD50N04-8M8P-4GE3
11 0 R6, R11 (OPT) RES., OPTION, 0603
12 1 R9 RES., 0.01Ω, 1%, 1W, 2512, PWR, METAL, SENSE VISHAY, WSL2512R0100FEA
13 1 R10 RES., 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA
14 1 R12 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA
Hardware: For Demo Board Only
1 12 E1, E2, E5-E9, E11,
E15-E18
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2501-2-00-80-00-00-07-0
2 4 E3, E10, E12, E13 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0
3 2 JP1, JP2 CONN., HDR, MALE, 2x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000621121
4 4 J1-J4 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,
SWAGE, 0.218"
KEYSTONE, 575-4
5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000
6 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
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7
DEMO MANUAL DC2779A
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
ALL CAPACITORS ARE 0603.
NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0603.
FCM/SYNC
BURST
SPREAD-SPECTRUM
120 180
90
° °
°
PHMODE
OPTIONAL TRANSIENT RESPONSE CIRCUIT
VOUT
VOUT
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
11
NAME
NAME
LT8644S
8V, 16A SYNCHRONOUS
DC2779A
710-DC2779A_REV03
N/A
STEP-DOWN SILENT SWITCHER 2
Thursday, May 20, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
11
NAME
NAME
LT8644S
8V, 16A SYNCHRONOUS
DC2779A
710-DC2779A_REV03
N/A
STEP-DOWN SILENT SWITCHER 2
Thursday, May 20, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES 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 ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
11
NAME
NAME
LT8644S
8V, 16A SYNCHRONOUS
DC2779A
710-DC2779A_REV03
N/A
STEP-DOWN SILENT SWITCHER 2
Thursday, May 20, 2021
C25 4.7uF 10V
C26
22uF
10V
1206
E11
EN
JP1
1 2 3 4 5 6
R9 0.01
2512
E9
GND
Q1
SUD50N04-8m8P
2
1
3
E16
VC
L2
OPT
IHLP1616
E3
SVIN
C17
22uF
10V
1206
E17 LOAD_STEP
C7 OPT
C22
TBD
0805
U1 LT8644S
EN 17
SYNC
20
VCC_INT
2
RT
18
FB 24
PG 23
PHSMD 1
BST 7
AGND
3
SS
21
GND
16
PVIN
5
PVIN
6
PVIN
13
PVIN
14
VC
22
CLKOUT 19
SW 8 SW 9 SW 10 SW 11 SW 12
GND
25
GND
26
GND
27
GND
28
SVIN
4
PVIN
15
C2
10uF
16V
R6 OPT
FB1
74279221100
C9
22uF 4V
R12 0
L1
0.13uH
XEL5030-131MEB
1 2
E15
GND
C14
1uF
0402
25V
E8 PG
E5
SYNC
C24 OPT
R7
100k
R3
100k
+
C1
100uF
16CE100BS
16V
J1
VIN
2.7V - 8V
C12 10uF
16V
C5 390pF
C6
220uF
4V
1206
C19
220uF
4V
1206
R11 OPT
E2 GND
C3
22uF
10V
1206
E7
SS
J3
VOUT+
1.2V / 16A
C20 22uF
4V
E1
VEMI
C21 1uF
C16
33pF
J4 VOUT-
C10
22uF
10V
1206
E10
VIN_SENSE
C15 OPT
C8 0.1uF
R8
1
R1
100k
JP2
1 2 3 4 5 6
R5
100k
E6 CLKOUT
E12 VOUT+ SENSE
R10 10k
J2
GND
C23 OPT
E18 PULSE_GEN
R2 16.9k
R4
13.3k
E13 VOUT- SENSE
FB
VCC
VIN
VCC
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8
DEMO MANUAL DC2779A
Rev. 0
 ANALOG DEVICES, INC. 2021
10/21
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.
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