Analog Devices DC2897A User manual

DC2897A
Analog Devices
Brand
Analog Devices
Model
DC2897A
Type
User manual

Analog Devices DC2897A is a low IQ, triple output, synchronous step-down supply featuring the LTC7819. It provides outputs of 3.3V at 12A, 8.5V at 10A, and 5.0V at 12A over an input voltage range of 10V to 36V. Its features include forced continuous mode, pulse-skipping, and Burst Mode operation, as well as optional spread spectrum modulation to reduce EMI and a PLLIN pin to synchronize to an external clock.

Analog Devices DC2897A is a low IQ, triple output, synchronous step-down supply featuring the LTC7819. It provides outputs of 3.3V at 12A, 8.5V at 10A, and 5.0V at 12A over an input voltage range of 10V to 36V. Its features include forced continuous mode, pulse-skipping, and Burst Mode operation, as well as optional spread spectrum modulation to reduce EMI and a PLLIN pin to synchronize to an external clock.

1
DEMO MANUAL
DC2897A
Rev. 0
DESCRIPTION
LTC7819
Low IQ, Triple Output
Synchronous Step-Down Supply
Demonstration circuit 2897A is a low IQ, triple output,
synchronous step-down supply featuring the LTC
®
7819.
The circuit is optimized for high efficiency. It provides
outputs of 3.3V at 12A, 8.5V at 10A and 5.0V at 12A over
an input voltage range of 10V to 36V with a switching
frequency of 380kHz. Each rail uses a 3mΩ sense resis-
tor to sense the current and provides optional footprints
for DCR sensing. Typical applications include automotive,
transportation, industrial, military and avionics systems.
Features of the DC2897A include pin selectable light
load operating modes of forced continuous mode,
All registered trademarks and trademarks are the property of their respective owners.
BOARD PHOTO
pulse-skipping and Burst Mode
®
operation. Optional
spread spectrum modulation to reduce EMI, a PLLIN pin
to synchronize to an external clock, optional DCR sensing
footprints, an EXTVCC pin to reduce losses in the controller
and optional footprints to parallel two or three channels.
The LTC7819 data sheet provides a complete description
of the part, operational details, and applications infor-
mation. DC2897A must be read in conjunction with the
datasheet.
Design files for this circuit board are available.
2
DEMO MANUAL
DC2897A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2897A is easy to setup for eval
-
uating the LTC7819. Please refer to Figure 1 for the
proper measurement equipment setup and follow the
procedurebelow.
1. Connect the input power supply to VIN (10V – 36V)
and GND (input return).
2. Preset the load for each output to 0A and the input
supply to 0V.
3. Place jumpers in the following positions:
JP4: RUN1 ON
JP2: RUN2 ON
JP1: RUN3 ON
JP3: MODE FCC
JP5: SPREAD SPECTRUM NO
4. Set the input voltage to within the specified range and
check VOUT1, VOUT2 and VOUT3.
5. Once the proper output voltages have been confirmed,
observe the output voltage ripple, efficiency, and
otherparameters.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 10 36 V
Output Voltage #1, VOUT1 VIN = 10V to 36V, IOUT1 = 0A – 12A 3.3 V
Output Voltage #2, VOUT2 VIN = 10V to 36V, IOUT2 = 0A – 10A 8.5 V
Output Voltage #3, VOUT3 VIN = 10V to 36V, IOUT3 = 0A – 12A 5.0 V
Maximum Output Current, IOUT1 VIN = 10V to 36V, VOUT1 = 3.3V 12 A
Maximum Output Current, IOUT2 VIN = 10V to 36V, VOUT2 = 8.5V 10 A
Maximum Output Current, IOUT3 VIN = 10V to 36V, VOUT3 = 5.0V 12 A
Switching Frequency 380 kHz
Efficiency (fSW = 380kHz) VIN = 12V, VOUT1 = 3.3V, IOUT1 = 12A
VIN = 12V, VOUT2 = 8.5V, IOUT2 = 10A
VIN = 12V, VOUT3 = 5.0V, IOUT3 = 12A
94.9
97.9
96.4
%
%
%
LIGHT LOAD OPERATION, SYNCHRONIZATION TO AN
EXTERNAL CLOCK AND SPREAD SPECTRUM
To synchronize the LTC7819 to an external clock, place
the SPREAD SPECTRUM jumper (JP5) in the EXT CLK
position and apply an external clock between the PLLIN
turret and GND. The phase-lockable frequency range is
100kHz to 3MHz. The low clock level should be 0.5V or
lower and the high clock level should be 2.2V or higher.
For spread spectrum, place the jumper in the YES posi-
tion. With spread spectrum enabled, the frequency will be
modulated between 100% and 120% of the programmed
frequency (380kHz to 456kHz). This will help reduce the
peak emission levels. To allow the converter to free run
at is programmed frequency (380kHz), place the jumper
in the NO position which is the default setting.
Demonstration circuit 2897A can be programmed to
operate in either forced continuous conduction mode
(FCC), pulse-skipping mode (PS) or Burst Mode opera-
tion (BURST) at no load or light load with JP3. Forced
continuous mode (default setting) provides the clean-
est output voltage ripple. Pulse-skipping mode provides
higher efficiency at light load, but the output voltage ripple
is less regular. Burst Mode operation provides the highest
light load efficiency, but the output voltage ripple is the
least regular and highest of the three modes.
3
DEMO MANUAL
DC2897A
Rev. 0
OPTIONAL DCR SENSING
Demonstration circuit 2897A has optional footprints for
DCR sensing. The benefit of DCR sensing is a lower parts
count and high efficiency but at the expense of a less
accurate current sensing and current limit. To imple-
ment DCR sensing refer to Table1 and the Applications
Information section of the data sheet. Be sure to stuff a
0mΩ copper shunt or a short, thick piece of copper at
RS1, RS2 and/or RS3.
EXTVCC BIAS OPTION
The EXTV
CC
pin of the LTC7819 on the standard demo
board is connected to the 5V output (VOUT3) to reduce
the losses in the controller and improve efficiency. If nec-
essary, the EXTVCC pin can be tied to an external supply
by following these steps:
1. Remove the 0Ω jumper at R20.
2. Connect a DC voltage from the EXTVCC turret to a GND
turret. The DC voltage should be between 5V and 30V.
PARALLELING CHANNELS
For higher power, two or more channels of demonstra-
tion circuit 2897A can be paralleled. Given that the chan-
nels operate 120 degrees out of phase with each other,
paralleling channels provides the benefit of ripple cur-
rent cancelation in the output and input capacitors. This
in turn provides lower output voltage and input voltage
ripple. Another benefit of interleaved channels is a faster
load step response. When paralleling phases channel 1
is always the master and channels 2 and 3 are slaves.
In addition, each phase should have the same inductor,
sense resistor–if used and MOSFETs. Detailed instruc-
tions are below:
Parallel Channel 1 with Channel 2:
n Stuff 0Ω jumpers at R11, R12 and R15.
n Stuff a 0mΩ jumper or short, thick piece of copper
atR19.
Parallel Channel 1 with Channel 3:
n Stuff 0Ω jumpers at R10, R13 and R14.
n Stuff a 0mΩ jumper or short, thick piece of copper
atR18.
Parallel Channel 1 with Channel 2 and Channel 3:
n
Stuff 0Ω jumpers at R11, R10, R12, R13, R15 and R14.
n Stuff a 0mΩ jumper or short, thick piece of copper at
R19 and R18.
Notes
1. When measuring the output voltage or input voltage
ripple do not use the long ground lead on the oscillo-
scope probe. See Figure2 for the proper scope probe
technique. Short, stiff leads need to be soldered to the
(+) and (–) terminals of the output or input capacitor.
The probe’s ground ring needs to contact the (–) lead
and the probe tip needs to contact the (+) lead.
2. When powering the board, first connect the input sup-
ply to the demo board as written above. Next, turn-on
the input supply. Do not hot plug. This could cause
large input voltage transients that may damage the
converter, especially at high VIN.
3. When using electronic loads which are rated to pro-
vide full current with a voltage of 0V, make sure the
load is off before turning off the rail. Otherwise, the
load could pull VOUT below ground. This may damage
theconverter.
QUICK START PROCEDURE
Table1. Optional Inductor DCR Sensing
CONFIGURATION
CHANNEL 1 RS1 R30 R29 C14 R45 R47 R61
CHANNEL 2 RS2 R52 R54 C56 R50 R49 R46
CHANNEL 3 RS3 R40 R39 C15 R51 R53 R62
RSENSE (DEFAULT) 3mΩ 0Ω 0Ω 1nF Open Open Open
DCR SENSING 0mΩ Cu Open Open Refer to Data Sheet 0Ω
4
DEMO MANUAL
DC2897A
Rev. 0
dc2897a F01
VOUT2
LOAD
IOUT2
+
–
+
–
+
–
+
–
VOUT1
LOAD +–
VOUT2
VOUT3
LOAD
IOUT3
VOUT3
+
–
IIN
IOUT1
+
–
VOUT1
VIN SUPPLY
+
–
VIN
NOTE FOR ACCURATE EFFICIENCY MEASUREMENTS:
MONITOR VOUT1, VOUT2 AND VOUT3 ACROSS COUT1, COUT7 AND COUT4, RESPECTIVELY.
MONITOR VIN ACROSS EITHER CIN7 (CH1), CIN9 (CH2) OR CIN5 (CH3).
Figure1. Proper Measurement Equipment Setup
+ –
VOUT GND
COUT
dc2897a F02
Figure2. How to Measure the Output or Input Voltage Ripple
QUICK START PROCEDURE
5
DEMO MANUAL
DC2897A
Rev. 0
QUICK START PROCEDURE
Figure3. Efficiency of the 3.3V/12A Rail (VOUT1) Over the
Input Voltage Range, the Other Two Rails Were Disabled, No
Voltage Was Applied to the EXTVCC Pin and the PGOOD Pull-Ups
WereRemoved
Figure4. Efficiency of the 8.5V/10A Rail (VOUT2) Over the
Input Voltage Range, the Other Two Rails Were Disabled, No
Voltage Was Applied to the EXTVCC Pin and the PGOOD Pull-Ups
WereRemoved
Figure5. Efficiency of the 5V/12A Rail (VOUT3) Over the Input
Voltage Range, the Other Two Rails Were Disabled, the 5V Output
was Tied to the EXTVCC Pin and the PGOOD Pull-Ups Were Removed
f
SW
= 380kHz
MODE = FCM
V
= 12V
V
= 24V
V
= 36V
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
75
80
85
90
95
100
EFFICIENCY (%)
dc2897a F03
Efficiency, VOUT = 3.3V
f
SW
= 380kHz
MODE = FCM
V
= 12V
V
= 24V
V
= 36V
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9
10
75
80
85
90
95
100
EFFICIENCY (%)
dc2897a F04
Efficiency, VOUT = 8.5V
f
SW
= 380kHz
MODE = FCM
V
= 12V
V
= 24V
V
= 36V
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
75
80
85
90
95
100
EFFICIENCY (%)
dc2897a F05
Efficiency, VOUT = 5V
6
DEMO MANUAL
DC2897A
Rev. 0
QUICK START PROCEDURE
Figure6. Efficiency of the 3.3V/12A Rail (VOUT1) at 12VIN for the
Three Light Load Operating Modes, the Other Two Rails Were
Disabled, No Voltage Was Applied to the EXTVCC Pin and the
PGOOD Pull-Ups Were Removed
Figure8. Efficiency of the 5V/12A Rail (VOUT3) for the Three Light
Load Operating Modes, the Other Two Rails Were Disabled, the
5V Output Was Tied to the EXTVCC Pin and the PGOOD Pull-Ups
Were Removed
f
SW
= 380kHz
Burst Mode
PULSE SKIP
FCM
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
1
10
100
EFFICIENCY (%)
dc2897a F07
f
SW
= 380kHz
Burst Mode
PULSE SKIP
FCM
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
100
1
10
100
EFFICIENCY (%)
dc2897a F08
f
SW
= 380kHz
Burst Mode
PULSE SKIP
FCM
LOAD CURRENT (A)
0.001
0.01
0.1
1
10
100
1
10
100
EFFICIENCY (%)
dc2897a F06
Efficiency, VOUT = 3.3V, VIN = 12V
Figure7. Efficiency of the 8.5V/10A Rail (VOUT2) at 12VIN for the
Three Light Load Operating Modes, the Other Two Rails Were
Disabled, No Voltage Was Applied to the EXTVCC Pin and the
PGOOD Pull-Ups Were Removed
Efficiency, VOUT = 8.5V, VIN = 12V
Efficiency, VOUT = 5V, VIN = 12V
7
DEMO MANUAL
DC2897A
Rev. 0
Figure9. Thermal Image with Full Load on Each Rail at 12VIN,
fSW = 380kHz, No Airflow, TA = 23°C, Markers Show the Hot Spot
for Each Channel
Figure10. Thermal Image with Full Load on Each Rail at 36VIN,
fSW = 380kHz, No Airflow, TA = 23°C, Markers Show the Hot Spot
for Each Channel
Figure11. 50% to 100% Load Step Response of the 3.3V/12A
Rail (VOUT1)
Figure12. 50% to 100% Load Step Response of the 8.5V/10A
Rail (VOUT2)
Figure13. 50% to 100% Load Step Response of the
5.0V/12A Rail (VOUT3)
50µs/DIV
dc2897a F11
VOUT (AC)
100mV/DIV
LOAD
CURRENT
5A/DIV
100µs/DIV
dc2897a F12
VOUT (AC)
200mV/DIV
LOAD
CURRENT
5A/DIV
50µs/DIV
VOUT (AC)
100mV/DIV
LOAD
CURRENT
5A/DIV
dc2897a F13
QUICK START PROCEDURE
8
DEMO MANUAL
DC2897A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 5 C1, C14, C15, C43, C56 CAP., 1000pF, C0G, 50V, 10%, 0603 AVX, 06035A102KAT2A
2 1 C11 CAP., 4.7μF, X5R, 10V, 10%, 0805 KEMET, C0805C475K8PACTU
MURATA, GRM21BR61A475KA73L
SAMSUNG, CL21A475KPFNNNF
TDK, C2012X5R1A475K125AA
3 8 C2, C4, C20, C21, C47, C52,
C61, C74
CAP., 0.1μF, X7R, 50V, 10%, 0603 AVX, 06035C104KAT2A
KEMET, C0603C104K5RAC7867; C0603C104K5RACTU
TDK, C1608X7R1H104K080AA
4 1 C41 CAP., 2200pF, X7R, 50V, 10%, 0603 AVX, 06035C222KAT2A
MURATA, GRM188R71H222KA01D
SAMSUNG, CL10B222KB8NFNC
5 2 C42, C44 CAP., 47pF, X7R, 50V, 10%, 0603 AVX, 06035C470KAT2A
KEMET, C0603C470K5RACTU
6 1 C53 CAP., 0.01μF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H103JA01D
TDK, C1608C0G1H103J080AA
7 1 C54 CAP., 220pF, X7R, 50V, 10%, 0603 AVX, 06035C221KAT2A
KEMET, C0603C221K5RACTU
NIC, NMC0603X7R221K50TRPF
8 2 C69, C70 CAP., 1μF, X7R, 10V, 10%, 0603 AVX, 0603ZC105KAT2A
KEMET, C0603C105K8RACTU
MURATA, GRM188R71A105KA61D
TDK, C1608X7R1A105K080AC
9 1 CIN1 CAP., 220μF, ALUM ELECT, 50V, 20%,
10mm × 10.2mm, RADIAL, SMD,
AEC-Q200
PANASONIC, EEEFK1H221GP
CORNELL DUBILIER, AFK227M50G24T-F
10 8 CIN3, CIN4, CIN5, CIN6,
CIN7, CIN8, CIN9, CIN10
CAP., 4.7μF, X7R, 50V, 10%, 1210 AVX, 12105C475KAT2A
KEMET, C1210C475K5RACTU
MURATA, GRM32ER71H475KA88L
YAGEO, CC1210KKX7R9BB475
11 6 COUT1, COUT2, COUT4,
COUT5, COUT7, COUT8
CAP., 47μF, X7R, 10V, 10%, 1210 AVX, 1210ZC476KAT2A
MURATA, GRM32ER71A476KE15L
TAIYO YUDEN, LMK325B7476KM-PR; LMK325B7476KM-TR
12 2 COUT10, COUT11 CAP., 470μF, TANT, POSCAP, 6.3V, 20%,
7343, 10mΩ, TCF
PANASONIC, 6TCF470MAH
13 1 COUT12 CAP., 150μF, TANT. POSCAP, 10V, 20%,
7343, D3L
PANASONIC, 10TPF150ML
14 3 D1, D2, D6 DIODE, SCHOTTKY, 100V, 1A,
POWERDI-123, AEC-Q101
DIODES INC., DFLS1100Q-7
15 2 L1, L3 IND., 2.2μH, PWR., 20%,
11.8mm × 10.5mm SMD, AEC-Q200
COILCRAFT, XAL1010-222MEB; XAL1010-222MED
16 1 L2 IND., 3.3μH, PWR., 20%, 25A, 4.10mΩ,
11.8mm × 10.5mm, XAL1010, AEC-Q200
COILCRAFT, XAL1010-332MEB; XAL1010-332MED
17 3 Q1, Q3, Q5 XSTR., MOSFET, N-CH, 40V, 59A,
TDSON-8 FL
INFINEON, BSC059N04LS6; BSC059N04LS6ATMA1
18 3 Q2, Q4, Q6 XSTR., MOSFET, N-CH, 40V, 100A,
TDSON-8 FL
INFINEON, BSC022N04LS6; BSC022N04LS6ATMA1
19 16 R1, R3, R4, R5, R9, R25,
R27, R29, R30, R39, R40,
R44, R52, R54, R83, R84
RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA; CRCW06030000Z0EB
NIC, NRC06ZOTRF
9
DEMO MANUAL
DC2897A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
20 1 R20 RES., 0Ω, 1/4W, 1206, AEC-Q200 VISHAY, CRCW12060000Z0EA
PANASONIC, ERJ8GEY0R00V
NIC, NRC12ZOTRF
21 3 R26, R38, R55 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1004TRF
PANASONIC, ERJ3EKF1004V
VISHAY, CRCW06031M00FKEA
22 1 R31 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1002V
VISHAY, CRCW060310K0FKEA; CRCW060310K0FKEB
KOA SPEER, RK73H1JTTD1002F
23 2 R33, R35 RES., 20k, 1%, 1/10W, 0603 NIC, NRC06F2002TRF
VISHAY, CRCW060320K0FKEA
PANASONIC, ERJ3EKF2002V
YAGEO, RC0603FR-0720KL
24 1 R43 RES., 105k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603105KFKEA
NIC, NRC06F1053TRF
25 1 R57 RES., 133k, 1%, 1/10W, 0603 BOURNS, CR0603-FX-1333ELF
YAGEO, RC0603FR-07133KL
26 1 R58 RES., 13.7k, 1%, 1/10W, 0603,
AEC-Q200
VISHAY, CRCW060313K7FKEA
PANASONIC, ERJ3EKF1372V
27 1 R6 RES., 1k, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ102V
28 1 R60 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V
YAGEO, RC0603FR-074K99L
29 4 R7, R34, R37, R63 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603100KFKEA
NIC, NRC06F1003TRF
PANASONIC, ERJ3EKF1003V
30 3 R8, R36, R59 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
NIC, NRC06F10R0TRF
PANASONIC, ERJ3EKF10R0V
ROHM, MCR03EZPFX10R0
YAGEO, RC0603FR-0710RL
31 3 RS1, RS2, RS3 RES., 0.003, 0Ω, 1%, 2W, 2010 LONG-
SIDE TERM, METAL, SENSE, AEC-Q200
SUSUMU, KRL5025E-C-R003-F-T1
32 1 U1 IC, SYN. STEP-DOWN CONVERTER,
40-PIN QFN
ANALOG DEVICES, LTC7819RUJ#PBF; LTC7819RUJ#TRPBF
Additional Circuit Components
1 0 C38, C48, C60, C62, C63,
C64, C65, C66, C67, C68,
C71, C72, C73
CAP., OPTION, 0603
2 0 CIN2 CAP., OPTION, ALUM. ELECT., SMD
3 0 COUT13, COUT14, COUT15 CAP., OPTION, 1210
4 0 COUT3, COUT6, COUT9 CAP., OPTION, 7343
5 0 Q7, Q10, Q11, Q12, Q13, Q14 XSTR., OPTION, MOSFET N-CH,
PG-TDSON-8
6 0 R18, R19 RES., OPTION, 2010
7 0 R2, R10, R11, R12, R13,
R14, R15, R21, R22, R23,
R28, R32, R41, R42, R45,
R46, R47, R49, R50, R51,
R53, R56, R61, R62
RES., OPTION, 0603
10
DEMO MANUAL
DC2897A
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Hardware: For Demo Board Only
1 19 E1, E2, E3, E4, E5, E6, E7,
E8, E9, E10, E11, E12, E13,
E14, E15, E16, E17, E18, E19
TEST POINT, TURRET, 0.094" MTG.
HOLE, PCB 0.062" THK
MILL-MAX, 2501-2-00-80-00-00-07-0
2 8 J1, J2, J3, J4, J5, J6, J7, J8 CONN., BANANA JACK, FEMALE, THT,
NON-INSULATED, SWAGE, 0.218"
KEYSTONE, 575-4
3 3 JP1, JP2, JP4 CONN., HDR, MALE, 1×3, 2mm, VERT,
ST, THT, NO SUBS. ALLOWED
WURTH ELEKTRONIK, 62000311121
4 2 JP3, JP5 CONN., HDR, MALE, 2×3, 2mm, VERT,
ST, THT
WURTH ELEKTRONIK, 62000621121
5 8 MP1, MP2, MP3, MP4,
MP5, MP6, MP7, MP8
STANDOFF, NYLON, SNAP-ON, 0.625"
(5/8"), 15.9mm
KEYSTONE, 8834
6 3 XJP1, XJP2, XJP4 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421
PARTS LIST
11
DEMO MANUAL
DC2897A
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
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A A
B B
C C
D DOPTIONAL DCR SNSEING COMPNENTS. SHORT RS1 - RS3.
OPTIONAL JUMPERS FOR
TYING PHASE 2, PHASE 3 OR BOTH TO PHASE 1
OPTIONAL MOSFETS
PRODUCTION2 11/10/21 M S
ECO DESCRIPTION APPROVED
REVISION HISTORY
DATEREV
SYNCHRONOUS STEP-DOWN SUPPLY
INTVCC
EXTVCC
VIN
VOUT2
VOUT1
VOUT3
VOUT1
INTVCC
VOUT3
INTVCC
INTVCC
VOUT2
VIN
VIN
VIN
INTVCC
INTVCC INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
VIN
VIN
VIN
INTVCC INTVCC
VIN VIN VIN
VOUT3
EXTVCC
INTVCC
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANAL OG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO.
IC NO.
ANALOG DEVICES HAS MADE A BEST EFF ORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED
SPECIFICATIONS; HOWEVER, IT REMAINS T HE CUSTOMER'S
RESPONSIBILITY TO VERIFY PROPER AND RELIABL E
OPERATION IN THE ACTUAL APPLICATION. COMPONENT
SUBSTITUTION AND PRINT ED CIRCUIT BOARD LAYOUT
MAY SIGNIFICANTLY AF FECT CIRCUIT PERFORMANCE
OR RELIABILITY. CONT ACT ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
MIKE S.
LTC7819RUJ
LOW IQ, TRIPLE OUTPUT
DC2897A 710-DC2897A_REV04
N/A
Wednesday, February 02, 2022
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANAL OG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO.
IC NO.
ANALOG DEVICES HAS MADE A BEST EFF ORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED
SPECIFICATIONS; HOWEVER, IT REMAINS T HE CUSTOMER'S
RESPONSIBILITY TO VERIFY PROPER AND RELIABL E
OPERATION IN THE ACTUAL APPLICATION. COMPONENT
SUBSTITUTION AND PRINT ED CIRCUIT BOARD LAYOUT
MAY SIGNIFICANTLY AF FECT CIRCUIT PERFORMANCE
OR RELIABILITY. CONT ACT ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
MIKE S.
LTC7819RUJ
LOW IQ, TRIPLE OUTPUT
DC2897A 710-DC2897A_REV04
N/A
Wednesday, February 02, 2022
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES.
APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANAL OG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO.
IC NO.
ANALOG DEVICES HAS MADE A BEST EFF ORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED
SPECIFICATIONS; HOWEVER, IT REMAINS T HE CUSTOMER'S
RESPONSIBILITY TO VERIFY PROPER AND RELIABL E
OPERATION IN THE ACTUAL APPLICATION. COMPONENT
SUBSTITUTION AND PRINT ED CIRCUIT BOARD LAYOUT
MAY SIGNIFICANTLY AF FECT CIRCUIT PERFORMANCE
OR RELIABILITY. CONT ACT ANALOG DEVICES
APPLICATIONS ENGINEERING FOR ASSISTANCE.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE TM
SANTA CLARA, CA 95054
11
LT
MIKE S.
LTC7819RUJ
LOW IQ, TRIPLE OUTPUT
DC2897A 710-DC2897A_REV04
N/A
Wednesday, February 02, 2022
<Variant Name>
R6
1k
C14
1000pF
R63
100k
CIN6
4.7uF
50V
1210
L2
3.3uH
XAL1010-332MEB
1 2
L3
2.2uH
XAL1010-222MEB
1 2
E14
VO1_SNS-
E15
VO3_SNS+
Q4
BSC022N04LS6
5
6
7
4
2
3
8
1
R25
0
R38
1M
R2 OPT
R4 0
R41
OPT
+
COUT3
OPT
7343
R7
100k
R61
OPT
Q2
BSC022N04LS6
5
6
7
4
2
3
8
1
E12
PGOOD1
R26
1M
E1
VIN+
R56
OPT
R18
OPT
2010
R14
OPT
R20 0
1206
L1
2.2uH
XAL1010-222MEB
12
E16
VO3_SNS-
CIN7
4.7uF
50V
1210
JP4
ON
OFF
RUN1
1
3
2
C41 2200pF
E3
PLLIN
R54
0
R57
133k
R51
OPT
R3 0
R5 0
CIN4
4.7uF
50V
1210
R62
OPT
E9
RUN1
R33 20k
R19
OPT
2010
E2
VIN-
R43
105k
Q13
OPT
5
6
7
4
2
3
8
1
Q1
BSC059N04LS6ATMA1
5
6
7
4
2
3
8
1
Q6
BSC022N04LS6
5
6
7
4
2
3
8
1
R46
OPT
R55
1M
E10
PGOOD2
R15
OPT
C38
OPT
C62
OPT
C11
4.7uF
10V
0805
J5
VOUT3
5V / 12A
R35
20k
JP1
ON
OFF
RUN3
1
3
2
R45
OPT
E7
RUN3
R59 10
R53
OPT
RS2
0.003
R30
0
R37
100k
R32
OPT
+
COUT9
OPT
7343
C63
OPT
J6
GND
RS1
0.003
R11
OPT
Q10
OPT
5
6
7
4
2
3
8
1
R83 0
CIN5
4.7uF
50V
1210
C43
1000pF
R60
4.99k
+
COUT10
470uF
6.3V
7343
12
D6
DFLS1100
21
COUT7
47uF
10V
1210
R13
OPT
C70
1uF
R23
OPT
RS3
0.003
R29
0
E11
PGOOD3
R27
0
E4
TRACK/SS1
C64
OPT
JP3
MODE
FCM
PS
BURST
1 2
3 4
5 6
R21
OPT
C68 OPT
U1
LTC7819RUJ
TRACK/SS1
2
ITH1
6
VFB1
5
VFB3
37
ITH3
36
TRACK/SS3
35
SENSE3- 39
SENSE3+ 38
RUN2
9
BG3 29
BG1 25
BOOST1 26
TG1 27
SW1 28
SENSE1- 3
PGND
41
SW3 31
TG3 32
BOOST3 30
RUN3
8
SENSE1+ 4
VPRG1
16
VIN 24
INTVCC 22
EXTVCC 23
12
SENSE2+
SENSE2-
11
SW2 19
TG2 18
BOOST2 20
BG2 21
FREQ
40
MODE
1
TRACK/SS2
15
ITH2
14
VFB2
13
PGOOD2
7
RUN1
10
PGOOD3
33
PGOOD1
17
PPLIN/SPREAD
34
Q11
OPT
5
6
7
4
2
3
8
1
R49
OPT
COUT8
47uF
10V
1210
CIN9
4.7uF
50V
1210
E8
RUN2
Q3
BSC059N04LS6ATMA1
5
6
7
4
2
3
8
1
C60
OPT
C2 0.1uF
+
COUT6
OPT
7343
CIN3
4.7uF
50V
1210
D1
DFLS1100
21
R36 10
JP2
ON
OFF
RUN2
1
3
2
Q14
OPT
5
6
7
4
2
3
8
1
R34
100k
J2
GND
+
CIN2
OPT
E5
TRACK/SS3
R47
OPT
C65
OPT
CIN10
4.7uF
50V
1210
R9 0
R50
OPT
C48
OPT
R58 13.7k
COUT4
47uF
10V
1210
C73
OPT
R22
OPT
COUT14
OPT
1210
C21
0.1uF
E13
VO1_SNS+
C71
OPT
R31
10K
C69
1uF
C20
0.1uF
COUT1
47uF
10V
1210
+
CIN1
220uF
50V
C15
1000pF
R44
0
D2
DFLS1100
21
COUT5
47uF
10V
1210
E6
TRACK/SS2
C47 0.1uF
C66
OPT
R10
OPT
R84
0
COUT15
OPT
1210
+
COUT12
150uF
7343,D3L
10V
R40
0
C72
OPT
C56
1000pF
J3
VOUT1
3.3V / 12A
C74
0.1uF
R42
OPT
Q5
BSC059N04LS6ATMA1
5
6
7
4
2
3
8
1
J7
VOUT2
8.5V / 10A
C42
47pF
R12
OPT
R52
0
C67
OPT
E17
VO2_SNS+
C4 0.1uF
E19
EXTVCC
R1 0
R28
OPT
Q12
OPT
5
6
7
4
2
3
8
1
C54
220pF
+
COUT11
470uF
6.3V
7343
12
R8 10
C44 47pF
J4
GND
COUT2
47uF
10V
1210
J8
GND
C61
0.1uF
E18
VO2_SNS-
Q7
OPT
5
6
7
4
2
3
8
1
R39
0
COUT13
OPT
1210
CIN8
4.7uF
50V
1210
JP5
SPREAD
YES
EXT CLK
NO
SPECTRUM
1 2
3 4
5 6
C1
1000pF
J1
VIN
10V to 36V
C53 0.01uF
C52 0.1uF
BG3
TG1
SNS1+
SW1
BG1
TG2
L2-
SNS2-
SW1
L1- L2-
SW3
SNS1-
L1-
SNS1-
SW2
L3-
SNS3-
SNS1+
L3-
SNS2+
BG2
BOOST2
SNS2+
SNS3+
PGOOD2
MODE
SNS3-
SNS2-
BOOST3
SW3
TG3
BOOST1
RUN1
ITH1
PGOOD3
SW2
RUN3
VPRG1
PGOOD1
PLLINSPREAD
SNS3+
VFB3
VFB2
ITH3
ITH2
RUN3 RUN2
VOUT1VOUT3 VO UT2
TG1
SW1
BG1
TG3
SW3
BG3
TG2
SW2
BG2
ITH2
RUN2
TRK/SS2
TRK/SS3
TRK/SS1
SW3
VFB3
VFB2
VFB1
RUN1
ITH3
12
DEMO MANUAL
DC2897A
Rev. 0
ANALOG DEVICES, INC. 2022
03/22
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
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Analog Devices DC2897A User manual

DC2897A
Analog Devices
Brand
Analog Devices
Model
DC2897A
Type
User manual

Analog Devices DC2897A is a low IQ, triple output, synchronous step-down supply featuring the LTC7819. It provides outputs of 3.3V at 12A, 8.5V at 10A, and 5.0V at 12A over an input voltage range of 10V to 36V. Its features include forced continuous mode, pulse-skipping, and Burst Mode operation, as well as optional spread spectrum modulation to reduce EMI and a PLLIN pin to synchronize to an external clock.

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