Analog Devices DC2897A User manual

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.

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.

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

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:

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

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

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

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F03

Efficiency, VOUT = 3.3V

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F04

Efficiency, VOUT = 8.5V

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F05

Efficiency, VOUT = 5V

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

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

100

EFFICIENCY (%)

dc2897a F07

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

100

EFFICIENCY (%)

dc2897a F08

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

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

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

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

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

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

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

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

VOUT2

VIN

INTVCC

INTVCC INTVCC

INTVCC

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

MIKE S.

LTC7819RUJ

LOW IQ, TRIPLE OUTPUT

DC2897A 710-DC2897A_REV04

N/A

Wednesday, February 02, 2022

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

MIKE S.

LTC7819RUJ

LOW IQ, TRIPLE OUTPUT

DC2897A 710-DC2897A_REV04

N/A

Wednesday, February 02, 2022

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

MIKE S.

LTC7819RUJ

LOW IQ, TRIPLE OUTPUT

DC2897A 710-DC2897A_REV04

N/A

Wednesday, February 02, 2022

C14

1000pF

R63

100k

CIN6

4.7uF

50V

1210

3.3uH

XAL1010-332MEB

1 2

2.2uH

XAL1010-222MEB

1 2

E14

VO1_SNS-

E15

VO3_SNS+

BSC022N04LS6

R25

R38

R2 OPT

R4 0

R41

OPT

COUT3

OPT

7343

100k

R61

OPT

BSC022N04LS6

E12

PGOOD1

R26

VIN+

R56

OPT

R18

OPT

2010

R14

OPT

R20 0

1206

2.2uH

XAL1010-222MEB

E16

VO3_SNS-

CIN7

4.7uF

50V

1210

JP4

OFF

RUN1

C41 2200pF

PLLIN

R54

R57

133k

R51

OPT

R3 0

R5 0

CIN4

4.7uF

50V

1210

R62

OPT

RUN1

R33 20k

R19

OPT

2010

VIN-

R43

105k

Q13

OPT

BSC059N04LS6ATMA1

BSC022N04LS6

R46

OPT

R55

E10

PGOOD2

R15

OPT

C38

OPT

C62

OPT

C11

4.7uF

10V

0805

VOUT3

5V / 12A

R35

20k

JP1

OFF

RUN3

R45

OPT

RUN3

R59 10

R53

OPT

RS2

0.003

R30

R37

100k

R32

OPT

COUT9

OPT

7343

C63

OPT

GND

RS1

0.003

R11

OPT

Q10

OPT

R83 0

CIN5

4.7uF

50V

1210

C43

1000pF

R60

4.99k

COUT10

470uF

6.3V

7343

DFLS1100

COUT7

47uF

10V

1210

R13

OPT

C70

1uF

R23

OPT

RS3

0.003

R29

E11

PGOOD3

R27

TRACK/SS1

C64

OPT

JP3

MODE

FCM

BURST

1 2

3 4

5 6

R21

OPT

C68 OPT

LTC7819RUJ

TRACK/SS1

ITH1

VFB1

VFB3

ITH3

TRACK/SS3

SENSE3- 39

SENSE3+ 38

RUN2

BG3 29

BG1 25

BOOST1 26

TG1 27

SW1 28

SENSE1- 3

PGND

SW3 31

TG3 32

BOOST3 30

RUN3

SENSE1+ 4

VPRG1

VIN 24

INTVCC 22

EXTVCC 23

SENSE2+

SENSE2-

SW2 19

TG2 18

BOOST2 20

BG2 21

FREQ

MODE

TRACK/SS2

ITH2

VFB2

PGOOD2

RUN1

PGOOD3

PGOOD1

PPLIN/SPREAD

Q11

OPT

R49

OPT

COUT8

47uF

10V

1210

CIN9

4.7uF

50V

1210

RUN2

BSC059N04LS6ATMA1

C60

OPT

C2 0.1uF

COUT6

OPT

7343

CIN3

4.7uF

50V

1210

DFLS1100

R36 10

JP2

OFF

RUN2

Q14

OPT

R34

100k

GND

CIN2

OPT

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

DFLS1100

COUT5

47uF

10V

1210

TRACK/SS2

C47 0.1uF

C66

OPT

R10

OPT

R84

COUT15

OPT

1210

COUT12

150uF

7343,D3L

10V

R40

C72

OPT

C56

1000pF

VOUT1

3.3V / 12A

C74

0.1uF

R42

OPT

BSC059N04LS6ATMA1

VOUT2

8.5V / 10A

C42

47pF

R12

OPT

R52

C67

OPT

E17

VO2_SNS+

C4 0.1uF

E19

EXTVCC

R1 0

R28

OPT

Q12

OPT

C54

220pF

COUT11

470uF

6.3V

7343

R8 10

C44 47pF

GND

COUT2

47uF

10V

1210

GND

C61

0.1uF

E18

VO2_SNS-

OPT

R39

COUT13

OPT

1210

CIN8

4.7uF

50V

1210

JP5

SPREAD

YES

EXT CLK

SPECTRUM

1 2

3 4

5 6

1000pF

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

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

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.

Analog Devices DC2897A User manual

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