demo manual dc2855a ltc7818 triple output synchronous … · 2020. 3. 10. · vout3 output3 voltage...
TRANSCRIPT
1
DEMO MANUAL DC2855A
Rev. 0
DESCRIPTION
LTC7818Triple Output Synchronous Step-Up/Dual
Step-Down Supply
Demonstration circuit DC2855A is a triple output syn-chronous step-up/dual step-down supply featuring the LTC®7818. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/10A supplied by a boosted 10V output. Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout whereas the main buck circuit components fit in an area of ¾” by 1½”, while the main boost circuit area is ¾” by 1¾”. The package style for the LTC7818 is a 40-pin exposed pad QFN.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
The main features of the board include rail tracking (Buck channels only), an internal 5V linear regulator for bias, separated RUN pins for each output, a PGOOD signal (CH1 only), an overvoltage indicator for CH3 and a Mode selector that allow the converter to run in CCM, Pulse-skipping or Burst Mode operation. Spread Spectrum Mode is availiable for EMI improvement. Synchronization to an external clock is also possible. The LTC7818 data-sheet gives a complete description of these parts, opera-tion and application information. The datasheet must be read in conjunction with this quick start guide for demo circuit 2855A.
Design files for this circuit board are available.
Specifications are at TA = 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range Operating (Note 1) 4.5 36 V
Continuous operation, IOUT1 = 0A-10A, IOUT2 = 0A-10A, free air 8 16 V
VOUT1 Output1 Voltage 3.2 3.3 3.4 V
VOUT2 Output2 Voltage 4.9 5 5.1 V
VOUT3 Output3 Voltage VIN = 4.5V-10V (Note 2) 9.8 10 10.2 V
IOUT1 Output1 Current 0 10 A
IOUT2 Output2 Current 0 10 A
IOUT3 Output3 Current 0 10 (Note 3) A
fSW Switching Frequency 2200 kHz
POUT/PIN Efficiency VIN = 12V, VOUT1 = 3.3V, IOUT1 = 10A, RUN2 = 0 88 %
VIN = 12V, VOUT2 = 5V, IOUT2 = 10A, RUN1 = 0 91.6 %
VIN = 12V, VOUT1 = 5V, VOUT2 = 3.3V, IOUT1 = 10A, IOUT2 = 10A 90 %
VIN = 8V, VOUT3 = 10V, IOUT3 = 10A, RUN1, 2 = 0 94.6 %
Note 1: When 4.5V < VIN < 8V and 16V < VIN < 36V, only short time operation is allowed at maximum output power (free air). For example, run 10sec when VIN = 4.5V, 2min when VIN = 6V, 2min when VIN = 26V, 10s when VIN = 36V or continuously operate for de-rated output current.Note 2: VOUT3 follows VIN when VIN > VOUT3.Note 3: 10A Maximum output includes the current supplying CH1 and CH2.
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DEMO MANUAL DC2855A
Rev. 0
QUICK START PROCEDUREDemonstration circuit DC2855A is easy to set up to evalu-ate the performance of the LTC7818. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below:
NOTE: When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscil-loscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND termnals or directly across the relevant capaci-tor. See Figure 2 for proper scope probe technique.
1. Place jumpers in the following positions:
JP1 ON
JP2 ON
JP3 ON
JP4 SPREAD OFF
JP5 Force Continuous Mode (FCM)
2. With power off, connect the input power supply to VIN and GND. With power off, connect loads from VOUT to GND.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed 36V.
4. Check for the proper output voltages.
VOUT1 = 3.2V to 3.4V
VOUT2 = 4.9V to 5.1V
VOUT3 = 9.8V to 10.2V (VOUT3 follows VIN when VIN is higher than 10V)
NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high.
5. Once the proper output voltages are established, adjust the loads within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency, and other parameters.
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC2855A
Rev. 0
QUICK START PROCEDURE
Mode Selection, Spread Spectrum, and Frequency Synchronization
The Demonstration circuit 2855A’s Mode selector allows the converter to run in FCM operation, pulse skip opera-tion, and Burst Mode by changing the position of JP5.
Spread Spectrum is enabled by placing JP4 to “ON” posi-tion. For synchronizing to an external clock source, JP4 jumper needs to be removed. Apply the external clock from PLLIN/SPREAD turret to GND. Refer to Table 1 and to the datasheet for more details.
Rail Tracking
Demonstration circuit 2855A is configured for an on-board soft-start circuit. The soft-start ramp rate can be adjusted by changing the value of C2 and C47. Demonstration cir-cuit 2855A can also be modified to track an external ref-erence. Refer to Table 2 and Table 3 for tracking options and to the datasheet for more details.
Figure 2. Proper Measurement Equipment Setup
VOUT GND
COUT
Table 1. Mode Selection and Synchronizing Operation OptionsCONFIGURATION MODE JUMPER
Forced CCM Mode Operation “FCM”
Pulse Skip Mode Operation “PS”
Burst Mode Operation “BURST”
Synchronize to Ext. clock (Ext. clock apply to PLLIN/SPREAD turret) Remove Jumper JP4
Spread Spectrum Mode “SPREAD ON”
Table 2. VOUT1 Tracking OptionsCONFIGURATION R2 R3 C2 TRK/SS1 CAP
Soft Start Without Tracking (Default) OPEN OPEN 0.1uF OPEN
VOUT1 Tracking Scaled VOUT2 Resistor Divider OPEN OPEN
Table 3. VOUT2 Tracking OptionsCONFIGURATION R34 R37 C47 TRK/SS2 CAP
Soft Start Without Tracking (Default) 0Ω OPEN 0.1uF OPEN
VOUT2 Equals External Ramp 0Ω OPEN OPEN External Ramp
VOUT2 Tracking Scaled External Ramp Resistor Divider OPEN External Ramp
4
DEMO MANUAL DC2855A
Rev. 0
QUICK START PROCEDUREOptional Inductor DCR Current Sensing
Demonstration circuit 2855A provides an optional circuit for Inductor DCR Current Sensing. Inductor DCR Current Sensing uses the DC resistance of the inductor to sense the inductor current instead of discrete sense resistors. The advantages of DCR sensing are lower cost, reduced board space, and higher efficiency, but the disadvantage is a less accurate current limit. If DCR sensing is used, be sure to select an inductor with a sufficiently high satura-tion current.
Refer to Table 4 for Optional Inductor DCR Current Sensing setup and to the datasheet for more details.
Low Quiescent Current Applications
The typical quiescent current (IQ) of the LTC7818 control-ler is 14uA in sleep mode as specified in the LTC7818 datasheet. However, the input current of the DC2855A board can be higher than this value because of the addi-tional circuit outside of the IC. Several methods can be adopted to reduce the total input current: (1) Large value FB divider resistors should be used; (2) If 8V or 10V boost output is required, connecting VPRG3 to GND or INTVCC, with VFB3 directly connected to the output can reduce IQ; (3) In addition, the optional pull-up resistors should be removed from the board.
Minimum On-Time Causes Channel 2 And Channel 3 To Skip Pulses
The typical minimum on-time Ton(min) of the LTC7818 is 40ns for the Buck channels, and 80ns for the boost channel as specified in the datasheet. Therefore, when the input voltage is higher than 30V the CH2 may start to skip pulses at no load condition. And when the input voltage is higher than 7.5V, the CH3 may start to skip pulses at no load condition.
Thermal Derating Of The Buck Channels
The maximum DC output current of each Buck channel is specified at the nominal input voltage, which is 8V~16V. At higher input voltage, because of the increased power losses, the output currents should be derated. The power devices (Power MOSFETs, inductors) surface temperature must be monitored to ensure safe steady-state operation at higher input voltages.
EXTVCC Supply
With the high switching frequency, the power losses im-posed on the LTC7818 on-board gate drivers and LDO become a concern. Apply an external supply voltage to the EXTVCC turret can help reduce LDO loss. On the DC2855A board, by removing R55 and placing zero ohm for R93, 5V (output of channel 2) will be provided for EXTVCC.
Table 4. Optional Inductor DCR Current Sensing
CONFIGURATION
CHANNEL1 RS1 R29 R30 C14 R45 R47 R61
CHANNEL2 RS2 R39 R40 C15 R51 R53 R62
CHANNEL3 RSNS1,2 R80 R81 C56 R89 R90 R91
Current Sense Resistor (Default) Ref. Sch. Ref. Sch. Ref. Sch. Ref. Sch. OPEN OPEN OPEN
Inductor DCR Current Sensing 0Ω Copper OPEN OPEN Calculated Value from Datasheet 0Ω
5
DEMO MANUAL DC2855A
Rev. 0
TYPICAL PERFORMANCE CHARACTERISTICS
LOAD CURRENT (A)0
VOLT
AGE
DROP
(mV)
80
20
10
30
70
50
60
40
042 6 8 10
LOAD CURRENT (A)0.1
EFFI
CIEN
CY (%
)
95
45
85
65
75
55
351 10
FCMBURSTPSM
FCMBURSTPSM
LOAD CURRENT (A)0.10
EFFI
CIEN
CY (%
)
95
55
75
85
65
45
50
60
70
80
90
1.00 10.00
LOAD CURRENT (A)0.1
EFFI
ECIE
NCY
(%)
90
40
80
60
70
50
301 10
FCMBURSTPSM
Figure 3. CH1 Efficiency (VIN = 12V, VOUT1 = 3.3V) Figure 4. CH2 Efficiency (VIN = 12V, VOUT2 = 5V)
Figure 5. CH3 Efficiency (VIN = 8V, VOUT3 = 10V) Figure 6. CH3 Voltage Drop in Pass-through Mode
6
DEMO MANUAL DC2855A
Rev. 0
TYPICAL PERFORMANCE CHARACTERISTICS
100μs/DIV
100mV/DIV
5A/DIV
DC2855 F07a100μs/DIV
100mV/DIV
5A/DIV
DC2855A F07b
Figure 7. Transient Response Waveform at 12V VIN and 5A – 10A – 5A load current
Figure 8. Thermal Image: VIN = 12V, VOUT1 = 3.3V, IOUT1 = 10A, VOUT2 = 5V, IOUT2 = 10A, NO AIR FLOW, TA = 25°C
(a) CH1: VOUT1 = 3.3V
(a) Front view
(b) CH1: VOUT2 = 5V
(b) Back view
7
DEMO MANUAL DC2855A
Rev. 0
Figure 9. Picture of demo board
TYPICAL PERFORMANCE CHARACTERISTICS
8
DEMO MANUAL DC2855A
Rev. 0
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART, NUMBER
Required Circuit Components
1 6 C2, C17, C20, C21, C47, C52
CAP., 0.1uF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A
2 1 C4 CAP., 1uF, X7R, 16V, 10%, 0603 KEMET, C0603C105K4RAC7867
3 1 C11 CAP., 4.7uF, X5R, 6.3V, 10%, 0805 AVX, 08056D475KAT2A
4 5 C14, C15, C56, C62, C74 CAP., 1000pF, X7R, 50V, 10%, 0603 AVX, 06035C102KAT2A
5 8 C32, C36, C79, C80, C81, C82, COUT1, COUT4
CAP., 47uF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J476ME19L
6 2 C37, C49 CAP., 10pF, X7R, 50V, 10%, 0603 AVX, 06035C100KAT2A
7 1 C41 CAP., 2200pF, X7R, 25V, 10%, 0603 AVX, 06033C222KAT2A
8 2 C42, C43 CAP., 47pF, C0G, 50V, 5%, 0603, AEC-Q200 AVX, 06035A470J4T2A
9 1 C44 CAP., 2200pF, X7R, 50V, 10%, 0603 AVX, 06035C222KAT2A
10 9 C50, C51, CIN6, CIN7, COUT6, COUT7, COUT8, CIN8, CIN9
CAP., 10uF, X7S, 50V, 10%, 1210 TAIYO YUDEN, UMK325C7106KM-T
11 1 C53 CAP., 820pF, C0G, 50V, 5%, 0603 AVX, 06035A821JAT2A
12 1 C54 CAP., 0.01uF, X7R, 50V, 10%, 0603 AVX, 06035C103KAT2A
13 10 C64, C65, C66, C67, C68, C69, C70, C71, C77, C78
CAP., 1uF, X7R, 50V, 10%, 0805 TAIYO, YUDEN, UMK212B7105KG-T
14 2 CIN1, COUT10 CAP., 120uF, ALUM. ELECT., 50V, 20%, 10x10.2mm SMD, RADIAL, AEC-Q200
PANASONIC, EEHZC1H121P
15 2 D1, D2 DIODE, SCHOTTKY, 40V, 250mW, SOD-323 CENTRAL SEMI., CMDSH-4E, TR, Lead, Free
16 1 D6 DIODE, SCHOTTKY, 100V, 250mW, SOD-323 ROHM, RB578VYM100FH
17 2 L1, L2 IND., 0.3uH, PWR., 20%, 10A, 21.45mOHMS, SMD 7.5mmX7.5mm, AEC-Q200
COILCRAFT, XAL7030-301ME
18 1 L3 IND., 0.18uH, PWR., 20%, 120A, 11.3x10mm SMD, XAL1060, AEC-Q200
COILCRAFT, XAL1060-181MEC
19 4 Q1, Q2, Q3, Q4 XSTR., MOSET, N-CH, 40V, 50A, PG-TDSON-8-33, AEC-Q101
INFINEON, IPC50N04S5L-5R5
20 2 Q8, Q10 XSTR., MOSFET, N-CH, 40V, 90A, PG-TDSON-8-33, AEC-Q101
INFINEON, IPC90N04S5L-3R3
21 18 R9, R25, R29, R34, R36, R39, R55, R70, R78, R80, R84, R87, R94, R95, R96, R97, R98, R99
RES., 0 OHM, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
22 2 R10, R105 RES., 0 OHM, 1W, 2512, 7A, AEC-Q200 VISHAY, CRCW25120000Z0EG
23 2 R30, R40 RES., 20 OHM, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF20R0V
24 5 R26, R38, R46, R48, R104
RES., 100k OHMS, 5%, 1/10W, 0603 PANASONIC, ERJ3GEYJ104V
25 2 R106, R107 RES., 0 OHMS, 2W, 2512 LONG SIDE TERM, AEC-Q200
VISHAY, RCL12250000Z0EG
26 1 R27 RES., 210k OHMS, 1%, 1/10W, 0603 NIC, NRC06F2103TRF
27 1 R31 RES., 10k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1002V
28 2 R32, R33 RES., 68.1k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF6812V
29 1 R35 RES., 9.1k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF9101V
9
DEMO MANUAL DC2855A
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART, NUMBER
30 1 R43 RES., 357k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF3573V
31 1 R75 RES., 3.6k OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF3601V
32 1 R81 RES., 249 OHMS, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF2490V
33 1 R86 RES., 2.2 OHMS, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ2R2V
34 1 R92 RES., 1M OHM, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031M00FKEA
35 2 RS1, RS2 RES., 0.003 OHMS, 5%, 1W, 1210, AEC-Q200 ROHM, PMR25HZPJV3L0
36 1 RSNS1 RES., 0.002 OHMS, SENSE, 1%, 2W, 2010, AEC-Q200, PULSE PROOF
VISHAY, WSLP20102L000FEA
37 1 U1 IC, HIGH FREQ. SYNCHRONOUS STEP UP/DUAL STEP-DOWN POWER SUPPLY, 40QFN
ANALOG DEVICES, LTC7818EUJ#PBF
Additional Demo Board Circuit Components
1 0 C38, C48, C55, C57, C60, C75, C76
CAP., OPTION, 0603
2 0 C58, C59 CAP., OPTION, 1210
3 0 C61, C72, C73, C83, C84, C85, C86
CAP., OPTION, 0805
4 0 COUT2, COUT5 CAP., OPTION, 7343
5 0 FB1, FB2 IND., OPTION, 1812
6 0 Q9, Q11 XSTR., OPTION, MOSFET N-CH, PG-TDSON-8
7 0 Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19
XSTR., OPTION, MOSFET N-CH, PPAK SO-8
8 0 R2, R3, R28, R37, R41, R45, R47, R51, R53, R61, R62, R72, R76, R77, R79, R85, R89, R90, R91, R93, R100, R103
RES., OPTION, 0603
9 0 R82 RES., OPTION, 1206
10 0 RSNS2 RES., OPTION, 2010
Hardware: For Demo Board Only
1 21 E1, E4, E9, E10, E11, E12, E13, E14, E22, E23, E24, E25, E26, E27, E30, E31, E32, E33, E34, E35, E36
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK
MILL-MAX
2 8 J7, J8, J9, J10, J11, J12, J13, J14
CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE, 0.218"
KEYSTONE
3 4 JP1, JP2, JP3, JP4 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT, NO SUBS. ALLOWED
WURTH ELEKTRONIK
4 1 JP5 CONN., HDR, MALE, 2x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK
5 5 XJP1, XJP2, XJP3, XJP4, XJP5
CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK
6 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK
PARTS LIST
10
DEMO MANUAL DC2855A
Rev. 0
SCHEMATIC DIAGRAM1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
AA
BB
CC
DD
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, Nov
embe
r 06,
201
9DA
TE:
SHEE
TOF
TITL
E: S
CHEM
ATIC
APPR
OVAL
SPC
B DE
S.
APP
ENG.
SIZE
:
SCHE
MAT
IC N
O. A
ND R
EVIS
ION:
CUST
OMER
NOT
ICE
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O AN
ALOG
DEV
ICES
AND
SUPP
LIED
FO
R US
E W
ITH
ANAL
OG
DEV
ICES
PAR
TS.
SKU
NO.
IC N
O.
ANAL
OG D
EVIC
ES H
AS M
ADE
A BE
ST E
FFOR
T TO
DES
IGN
ACI
RCUI
T TH
AT M
EETS
CUS
TOME
R-SU
PPLI
ED
SPEC
IFIC
ATIO
NS; H
OWEV
ER, IT
REM
AINS
THE
CUS
TOME
R'S
RESP
ONSI
BILI
TY T
O VE
RIFY
PRO
PER
AND
RELI
ABLE
OP
ERAT
ION
IN T
HE A
CTUA
L AP
PLIC
ATIO
N. C
OMPO
NENT
SU
BSTI
TUTI
ON A
ND P
RINT
ED C
IRCU
IT B
OARD
LAY
OUT
MAY
SIGN
IFIC
ANTL
Y AF
FECT
CIR
CUIT
PER
FORM
ANCE
OR
REL
IABI
LITY
. CON
TACT
ANA
LOG
DEVI
CES
APPL
ICAT
IONS
ENG
INEE
RING
FOR
ASS
ISTA
NCE.
2555
AUG
USTI
NE D
RIVE
www.
analo
g.co
m
ANAL
OGDE
VICE
SAH
EAD
OF W
HAT'S
POS
SIBL
ETM
SANT
A CL
ARA,
CA
9505
4
12
LT LING
J.
LTC7
818-
EUJLO
W IQ
HIG
H FR
EQUE
NCY
SYNC
HRON
OUS
DC28
55A
710-
DC28
55A_
REV0
4N
/AW
edne
sday
, Nov
embe
r 06,
201
9
R3
7
OP
T
R5
50
Q8
IPC
90
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4S
5L
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3
56
1
7
4
23
8
JP3
ON
OFF
RU
N3 1 32
C6
21
00
0p
F
C6
4
1u
F5
0V
08
05
R2
90
L2
0.3
uH
12
C5
2
0.1
uF
J12
GN
D
C8
5
OP
T0
80
5
E2
2
FRE
Q
R5
3O
PT
Q3
IPC
50
N0
4S
5L
-5R
5
567
4
23
81
R7
7O
PT
C4
7
0.1
uF
C8
0
47
uF
6.3
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20
6
C7
9
47
uF
6.3
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6
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4
SG
ND
R4
5
OP
T
R5
1
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D
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61
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10
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0
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4
VO
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91
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10
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5
OV
3
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81
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12
10
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PLL
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PR
EA
D
CO
UT
71
0u
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12
10
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2
47
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6
C8
1
47
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6.3
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20
6
R4
1
OP
T
C1
70
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F
E3
2
RU
N1
U1
LTC
7818
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TR
K/S
S1
35
ITH
136
VF
B1
37
VF
B2
13
ITH
214
TR
K/S
S2
15
SE
NS
E2-
11
SE
NS
E2+
12
RU
N2
9
BG
221
BG
129
BO
OS
T1
30
TG
132
SW
131
SE
NS
E1-
39
GND41
SW
219
TG
218
BO
OS
T2
20
RU
N1
8
SE
NS
E1+
38
IMON37
VB
IAS
24
INT
VC
C22
EX
TV
CC
23
SENSE3-4
SENSE3+3
SW
328
TG
327
BO
OS
T3
26
BG
325
FR
EQ
40
PLLIN
/SP
RE
AD
34
SS
32
ITH
36
VF
B3
5
PG
OO
D1
33
RU
N3
10
OV
317
VP
RG
316
MODE1
C3
64
7u
F6
.3V
12
06
R8
12
49
R7
53
.6k
FB
1
OP
T
RS
NS
10
.00
22
01
0
C8
4O
PT
08
05
E2
5
GN
D
R9
7
0
R9
8
0
C6
91
uF
50
V0
80
5R
34
0
C5
6
10
00
pF
C4
8
OP
T
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0
OP
T
R9
0O
PT
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02
0
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GN
D
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11
uF
50
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80
5
Q1
1O
PT
567
4
23
81
C3
8
OP
T
CIN
71
0u
F5
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12
10
R7
8
0
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2
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D
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8
1u
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0V
08
05
R1
00
OP
T
C2
0.1
uF
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3
VO
UT2
C4
1u
F
+C
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T2
OP
T7
34
3
1 2
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61
00
k
C5
7O
PT
R7
0 0
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5
0
C7
6O
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7
0
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PT
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50
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80
5
E2
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UN
3
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81
0u
F5
0V
12
10
C7
3O
PT
50
V0
80
5
+C
OU
T1
01
20
uF
50
V
R6
1
OP
T
C8
6O
PT
08
05
R7
2O
PT
R4
8
10
0k
R3
5
9.1
k
R9
4
0
R2
OP
T
R9
0
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IN1
12
0u
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50
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5
567
4
23
81
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6
0
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4.5V
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1
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50
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567
4
23
81
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11
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51
00
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F
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12
20
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C6
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50
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80
5
C5
4
0.0
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F
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6
1u
F5
0V
08
05
R8
6
2.2
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1
OP
T
C6
51
uF
50
V0
80
5
JP2
ON
OFF
RU
N2 1 32
R8
0 0
E2
3
SS
3
E1
0
TRA
CK
/ S
S2
E1
4
GN
D
R3
2
68
.1k
1%
R3
9 0 R8
4
0
E3
1
EX
TVC
C
C4
24
7p
F
R1
05
0
25
12
C8
3
OP
T0
80
5
D6
RB
57
8V
YM
10
0F
H
21
R9
21
M
C7
71
uF
50
V0
80
5
J10
GN
D
JP5
MO
DE
12
34
56
E4
PG
OO
D1
R2
72
10
k1
%
R2
8
OP
T
E2
7
VIN
+
L1
0.3
uH
12
E3
6
IMO
N
E9
TRA
CK
/ S
S1
Q9
OP
T
567
4
23
81
C6
81
uF
50
V0
80
5
J13
VO
UT3
R3
02
0
R3
OP
T
C4
91
0p
F
R1
00
CO
UT
14
7u
F6
.3V
12
06
JP1
ON
OFF
RU
N1 1 32
RS
1
0.0
03
12
10
R7
6O
PT
C1
1
4.7
uF
R2
5 0
C7
01
uF
50
V0
80
5
R1
03
OP
T
FB
2
OP
T
S1
+
VS
W1
TG
3
S3
+
VS
W1
VL
1-
VL
3-
VS
W2
S1
-
S1
-
VS
W3
S2
-
S1
+
VL
2-
S3-
BG
3
BO
OS
T3
S2
+S
3-
S2
+
S2
-S3+
BG
2
BO
OS
T2
TG
2
VS
W2
BO
OS
T1
VF
B2
VF
B1
RU
N3
PG
OO
D
RU
N2
SS
3
SS
2
SS
1
ITH
2 OV
3
BG
3A
SW
3
VS
W3
RU
N1
ITH
3
VF
B3
TG
1
BG
1
PR
G3
ITH
1
11
DEMO MANUAL DC2855A
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.
Rep
rese
nts
Tool
ing
hole
s
SHT 1
PCA
ADDI
TION
AL P
ARTS
STEP
-UP
DUAL
STE
P-DO
WN
SUPP
LY
VO
UT
3
VIN
13
VIN
23
VS
W3
VS
W2
TG
1
BG
3A
VS
W1
TG
2
TG
3 BG
2
BG
1
DATE
:SH
EET
OF
TITL
E: S
CHEM
ATIC
APPR
OVAL
SPC
B DE
S.
APP
ENG.
SIZE
:
SCHE
MAT
IC N
O. A
ND R
EVIS
ION:
CUST
OMER
NOT
ICE
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O AN
ALOG
DEV
ICES
AND
SUPP
LIED
FO
R US
E W
ITH
ANAL
OG
DEV
ICES
PAR
TS.
SKU
NO.
IC N
O.
ANAL
OG D
EVIC
ES H
AS M
ADE
A BE
ST E
FFOR
T TO
DES
IGN
ACI
RCUI
T TH
AT M
EETS
CUS
TOME
R-SU
PPLI
ED
SPEC
IFIC
ATIO
NS; H
OWEV
ER, IT
REM
AINS
THE
CUS
TOME
R'S
RESP
ONSI
BILI
TY T
O VE
RIFY
PRO
PER
AND
RELI
ABLE
OP
ERAT
ION
IN T
HE A
CTUA
L AP
PLIC
ATIO
N. C
OMPO
NENT
SU
BSTI
TUTI
ON A
ND P
RINT
ED C
IRCU
IT B
OARD
LAY
OUT
MAY
SIGN
IFIC
ANTL
Y AF
FECT
CIR
CUIT
PER
FORM
ANCE
OR
REL
IABI
LITY
. CON
TACT
ANA
LOG
DEVI
CES
APPL
ICAT
IONS
ENG
INEE
RING
FOR
ASS
ISTA
NCE.
2555
AUG
USTI
NE D
RIVE
www.
analo
g.co
m
ANAL
OGDE
VICE
SAH
EAD
OF W
HAT'S
POS
SIBL
ETM
SANT
A CL
ARA,
CA
9505
4
22
LT LING
J.
LTC7
818-
EUJ
LOW
IQ H
IGH
FREQ
UENC
Y SY
NCHR
ONOU
S
DC28
55A
710-
DC28
55A_
REV0
4N
/AW
edne
sday
, Nov
embe
r 06,
201
9DA
TE:
SHEE
TOF
TITL
E: S
CHEM
ATIC
APPR
OVAL
SPC
B DE
S.
APP
ENG.
SIZE
:
SCHE
MAT
IC N
O. A
ND R
EVIS
ION:
CUST
OMER
NOT
ICE
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O AN
ALOG
DEV
ICES
AND
SUPP
LIED
FO
R US
E W
ITH
ANAL
OG
DEV
ICES
PAR
TS.
SKU
NO.
IC N
O.
ANAL
OG D
EVIC
ES H
AS M
ADE
A BE
ST E
FFOR
T TO
DES
IGN
ACI
RCUI
T TH
AT M
EETS
CUS
TOME
R-SU
PPLI
ED
SPEC
IFIC
ATIO
NS; H
OWEV
ER, IT
REM
AINS
THE
CUS
TOME
R'S
RESP
ONSI
BILI
TY T
O VE
RIFY
PRO
PER
AND
RELI
ABLE
OP
ERAT
ION
IN T
HE A
CTUA
L AP
PLIC
ATIO
N. C
OMPO
NENT
SU
BSTI
TUTI
ON A
ND P
RINT
ED C
IRCU
IT B
OARD
LAY
OUT
MAY
SIGN
IFIC
ANTL
Y AF
FECT
CIR
CUIT
PER
FORM
ANCE
OR
REL
IABI
LITY
. CON
TACT
ANA
LOG
DEVI
CES
APPL
ICAT
IONS
ENG
INEE
RING
FOR
ASS
ISTA
NCE.
2555
AUG
USTI
NE D
RIVE
www.
analo
g.co
m
ANAL
OGDE
VICE
SAH
EAD
OF W
HAT'S
POS
SIBL
ETM
SANT
A CL
ARA,
CA
9505
4
22
LT LING
J.
LTC7
818-
EUJ
LOW
IQ H
IGH
FREQ
UENC
Y SY
NCHR
ONOU
S
DC28
55A
710-
DC28
55A_
REV0
4N
/AW
edne
sday
, Nov
embe
r 06,
201
9DA
TE:
SHEE
TOF
TITL
E: S
CHEM
ATIC
APPR
OVAL
SPC
B DE
S.
APP
ENG.
SIZE
:
SCHE
MAT
IC N
O. A
ND R
EVIS
ION:
CUST
OMER
NOT
ICE
THIS
CIR
CUIT
IS P
ROPR
IETA
RY T
O AN
ALOG
DEV
ICES
AND
SUPP
LIED
FO
R US
E W
ITH
ANAL
OG
DEV
ICES
PAR
TS.
SKU
NO.
IC N
O.
ANAL
OG D
EVIC
ES H
AS M
ADE
A BE
ST E
FFOR
T TO
DES
IGN
ACI
RCUI
T TH
AT M
EETS
CUS
TOME
R-SU
PPLI
ED
SPEC
IFIC
ATIO
NS; H
OWEV
ER, IT
REM
AINS
THE
CUS
TOME
R'S
RESP
ONSI
BILI
TY T
O VE
RIFY
PRO
PER
AND
RELI
ABLE
OP
ERAT
ION
IN T
HE A
CTUA
L AP
PLIC
ATIO
N. C
OMPO
NENT
SU
BSTI
TUTI
ON A
ND P
RINT
ED C
IRCU
IT B
OARD
LAY
OUT
MAY
SIGN
IFIC
ANTL
Y AF
FECT
CIR
CUIT
PER
FORM
ANCE
OR
REL
IABI
LITY
. CON
TACT
ANA
LOG
DEVI
CES
APPL
ICAT
IONS
ENG
INEE
RING
FOR
ASS
ISTA
NCE.
2555
AUG
USTI
NE D
RIVE
www.
analo
g.co
m
ANAL
OGDE
VICE
SAH
EAD
OF W
HAT'S
POS
SIBL
ETM
SANT
A CL
ARA,
CA
9505
4
22
LT LING
J.
LTC7
818-
EUJ
LOW
IQ H
IGH
FREQ
UENC
Y SY
NCHR
ONOU
S
DC28
55A
710-
DC28
55A_
REV0
4N
/AW
edne
sday
, Nov
embe
r 06,
201
9
MP
2S
TA
ND
OF
F,N
YL
ON
,SN
AP
-ON
,0.5
0"
MP
4S
TA
ND
OF
F,N
YL
ON
,SN
AP
-ON
,0.5
0"
Q1
2O
PT
567
4
23
81
MP
1S
TA
ND
OF
F,N
YL
ON
,SN
AP
-ON
,0.5
0"
ST
NC
L1
TO
OL
, S
TE
NC
IL,
70
0-D
C2
85
5A
RE
V0
4
X2
1
X1
1
Q1
8O
PT
567
4
23
81
Q1
7O
PT
567
4
23
81
Q1
5O
PT
567
423
81
Q1
9O
PT
567
4
23
81
MP
3S
TA
ND
OF
F,N
YL
ON
,SN
AP
-ON
,0.5
0"
Q1
3O
PT
567
4
23
81
Q1
6O
PT
567
4
23
81
Q1
4O
PT
567
4
23
81
LB
1B
OA
RD
S/N
LA
BE
L
PC
B1
PC
B,
DC
28
55
AR
EV
04
12
DEMO MANUAL DC2855A
Rev. 0
ANALOG DEVICES, INC. 2020
01/20www.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.