Analog Devices DC2874A-A Guía de configuración rápida

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

DESCRIPTION

LTC3310S

5V, Multiphase (40A, 30A, 20A), Synchronous

Step-Down Silent Switcher 2

Demonstration Circuit DC2874A shows the LTC

3310S

10A, Low Voltage, Synchronous Step-Down Silent

Switcher operating as a multiphase 2.0MHz, 3.3V to 1.2V

buck regulator. The DC2874A has three build options to

provide a two phase 20A, three phase 30A, or four phase

40A output solution. The LTC3310S supports adjustable

output voltages from 0.5V to VIN and operating frequen-

cies from 500kHz up to 2.25MHz in multiphase operation.

DC2874A operates in pulse skip mode and allows the

slave phases to stop switching first before the master

starts skipping pulses for better low current efficiency.

The DC2874A also has an EMI filter to reduce conducted

EMI. This EMI filter can be included by applying the input

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTO

voltage at the VIN EMI terminal. The EMI performance of

the board is shown in the EMI TEST RESULTS section.

The red lines in the EMI performance graphs illustrate

the CISPR25 Class 5 peak limits for the conducted and

radiated emission tests.

The Efficiency vs. Load graph shows the efficiency of the

circuit with a 3.3V input for the 2-, 3-, 4-phase circuits.

The LTC3310S datasheet gives a complete description of

the device, operation and application information. The data

sheet must be read in conjunction with this demo manual.

The LTC3310S is assembled in a 3mm x 3mm LQFN pack-

age with exposed pads for low thermal resistance.

Design files for this circuit board are available.

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN/VIN EMI DC2874A Input Voltage Range 2.25 5.5 V

VOUT DC2874A VOUT Voltage Range* 1.176 1.2 1.224 V

IOUT DC2874A Output Current −A, 4 phase build option

−B, 3 phase build option

−C, 2 phase build option

fSW Switching Frequency VIN greater than VOUT 1.8 2 2.2 MHz

Efficiency 2, 3, or 4 phase 92.5 %

*With 1% resistors. Accuracy will impprove to within 1% using 0.1% resistors.

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

TYPICAL APPLICATION

DC2874A–A 4–PHASE DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 32A, f

= 2MHz

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

AMBIENT NOISE

FREQUENCY (MHz)

100

110

–20

–10

AMPLITUDE (dBµV/m)

(CISPR25 Conducted Emission Test with Class 5 Peak Limits)

Conducted EMI Performance

DC2874A–A 4 PHASE DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 32A, f

= 2MHz

HORIZONTAL POLARIZATION

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

AMBIENT NOISE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

(CISPR25 Radiated Emission Test with Class 5 Peak Limits)

Radiated EMI Performance

DC2874A–A 4–PHASE DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 32A, f

= 2MHz

VERTICAL POLARIZATION

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

AMBIENT NOISE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

(CISPR25 Radiated Emission Test with Class 5 Peak Limits)

Radiated EMI Performance

OUT

= 40A)

VOUT Ripple

100ns/DIV

OUT

10mV/DIV

IOUT (A)

EFFICIENCY (%)

100

50 2515 35 402010 305

4 PHASE

3 PHASE

2 PHASE

LTC3310S

VOUT

1.2V

47µF

PGOOD

MODE/SYNC

ITH

PGOOD

MODE/SYNC

ITH

22µF

10µF

47µF

22µF

10µF

47µF

1µF

0.22µF

6.8pF

0.22µF

100nH

10k

390pF

0.1µF

VIN

2.25V TO 5.5V

PGNDAGNDSSTT

VIN

PGNDAGND

140k

100k

274K

L = COILCRAFT,XEL4030-101ME

VOUT Ripple

(IOUT = 40A)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2874A is easy to set up and evalu-

ate the performance of the LTC3310S in multiphase

operation. Refer to Figure1 for the proper measurement

equipment setup and jumper settings. Follow the proce-

dure below to familiarize yourself with the DC2874A.

NOTE:For accurate V

, V

OUT

and efficiency measure-

ments, measure VIN at the VIN SNSE and GND SNSE tur-

rets and V

OUT

at the VOUT SNSE and GND SNSE turrets as

illustrated as VM1 and VM2 in Figure1. When measuring

the input or output voltage ripple, care must be taken

to avoid a long ground lead on the oscilloscope probe.

Measure the output voltage ripple by touching the probe

tip directly across the output turrets or to TP1 as shown

in Figure2.

1. Set the JP1 Jumper to the HI position.

2. With power off, connect the input power supply to VIN

and GND. If the input EMI filter is desired, connect the

input power supply to VIN EMI and GND.

3. Slowly increase PS1 to 1.0V. If AM1 reads less than

20mA, increase PS1 to 3.3V. Verify that VM1 reads

3.3V and VM2 reads 1.2V. Record VM1, VM2, VM3

AM1 and AM2. Connect an oscilloscope voltage probe

as shown in Figure2. Set Channel to AC coupled, volt-

age scale to 10mV and time base to 100ns. Record

VOUT ripple voltage. Verify that PGOOD voltage is above

3V. Set the EN Jumper, JP1, to the HI position.

4. Increase the load by 1A intervals up to full load and

observe the voltage output regulation, ripple voltage.

5. To test the transient response with a base load, turn

off LD1 and add the desired resistor to produce a

minimum load between VOUT and I_STEP turrets (RL

shown on Figure1).

Note that the total load resistance will be RL plus the

parallel combination of R16 and R18 (10mΩ).

The DC2874A uses a buffered signal generator input

to drive a source follower circuit and control the slew

rate and amplitude of the current transient. The source

follower FET, Q1, is operated in the linear region dur-

ing the load step. The current step is measured as the

voltage across the parallel combination of R16 and R18

(10mΩ), VI_STEP.

6. Connect PS2 to the DRIVER BIAS and GND turrets.

Turn on and set PS2 to 8V.

7. Measure the I_STEP voltage to observe the current,

VI_STEP/10mΩ. Adjust the amplitude of the pulse to

provide the desired transient. Adjust the rising and fall-

ing edge of the pulse to provide the desired ramp rate.

Figure3 shows a load step from 8A (RL = 150mΩ) to

36A. Refer to the following equations:

IOUT =

I_ STEP

10mΩ

(1)

Where:

VI_ STEP =VSGINPUT −VGS

(2)

8. Set a signal generator with a 1ms pulse width, a 10ms

period and an amplitude from 0V to 3V, and then con-

nect it to the SG_INPUT turret.

NOTE:Do not allow the pulse generator to have more

than a 20% duty cycle. This can allow too much power

to be dissipated in Q1 and can damage the FET.

9. Connect an oscilloscope with a horizontal scale of

200us/Div with one channel having a vertical scale of

2V/Div on the SG_INPUT and another with a vertical

scale of 50mV/Div to the I_STEP turret.

10. Adjust the amplitude of the SG_INPUT pulse to obtain

the desired load pulse observed on the I_STEP turret.

11. Turn off PS1, PS2 and the signal generator. Remove

all connections from demo board.

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

QUICK START PROCEDURE

Figure1. Test Setup for the DC2874A Demo Board

Figure2. Technique for Measuring Output Ripple and Step Response

Figure3. DC2874A-A 4-Phase Load Transient Response

Load Transient Response

DC2874A–A 4–Phase

3.3V

IN TO 1.2V

OUT

LOADSTEP 8A TO 36A 1A/µs

200µs/DIV

SG_INPUT

2V/DIV

OUT

20mV/DIV

I_STEP

100mV/DIV

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

THEORY OF OPERATION

Introduction to the DC2874A

The DC2874A demonstration circuit features the LTC3310S,

a Low Voltage Synchronous Step-Down Silent Switcher in

two, three, or four phase operation. The LTC3310S is a

monolithic, constant frequency, current mode step-down

DC/DC converter. Connecting the RT pin of the master

phase, to a resistor to AGND programs the frequency from

500kHz to 2.25MHz and configures the MODE/SYNC pin

to become clock output used to drive the MODE/SYNC pin

of the slave phase(s). The DC2874A can operate with an

external clock by shorting the master phase RT pin to VIN

by placing a 0Ω resistor in the R5 location and applying a

sync pulse on the MODE/SYNC turret.

Connecting the FB pin to VIN configures a phase as a

slave. The MODE/SYNC becomes an input and the voltage

control loop is disabled. The slave phase current control

loop is still active and the peak current is controlled via the

shared ITH node. The phasing of a slave phase relative to

the master phase is programmed with a resistor divider

on the RT pin. Refer to Table 5 of the LT3310S datasheet

for more information on setting the slave phase angle.

In the multiphase application the LTC3310S operate in

pulse skip mode. At light loads, the slave phases will start

pulse skipping before the master phase and can eventu-

ally stop switching as the load continues to decrease.

The ability to allow the slave phases to stop switching

at light loads reduces Iq current and switching losses at

light loads.

Setting the compensation for the multiphase is similar to

setting the compensation to a single phase. When deter-

mining the compensation components, C11, C14 and R8,

controlling the loop stability and transient response are

the two main considerations. The LTC3310S has been

designed to operate at a high bandwidth for fast transient

response capabilities. This reduces output capacitance

required to meet the desired transient voltage range. The

mid-band gain of the loop increases with R8 and the band-

width of the loop increases with decreasing C14. C11

along with R6 provides a phase lead which will improve

the phase margin. C13, C33, C34, and C44 along with

R12 provides a high frequency pole to reduce the high

frequency gain. C13, C33, C34, and C44 are in paral-

lel on the ITH node. The sum of these caps will be the

total capacitance on the Master phase ITH pin. Too much

capacitance can slow down the response time.

Loop stability is generally measured using the Bode Plot

method of plotting loop gain in dB and phase shift in

degrees. The 0dB crossover frequency should be less

the 1/6 of the operating frequency to reduce the effects

of added phase shift of the modulator. The control loop

phase margin goal should be 45°. or greater and a gain

margin goal of 8dB or greater. Refer to the LTC3310S

datasheet and LTPowerCAD for more information on

choosing the required components.

The softstart of the multiphase regulator is controlled by a

single cap, C12, on the master phase. After the regulator

is in regulation the SSTT pin can be used to monitor the

temperature of each IC. The master phase temperature

can be monitored at the SSTT turret and slave 1, 2, and 3

can be monitored at TP3, 4, and 6 respectively. Calculate

the die temperature with the formula below:

TJ(°C) =

SSTT

4mV

−237

(3)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C2, C16, C23, C36 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D

2 8 C3, C10, C17, C24, C37,

C42, C49, C52

CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L

3 8 C4, C5, C18, C21, C25,

C28, C38, C41

CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A

5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A

7 8 C29, C30, C46-C48, C50,

C51, C53

CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D

8 4 L1-L4 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,

1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 3 R2, R11, R14 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

10 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED

11 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED

12 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC

13 2 R12, R13 RES., 301k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW0402301KFKEDC

14 4 U1-U4 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF

Additional Demo Board Circuit Components

1 6 C1, C15, C39, C60, C64,

C68

CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,

18mOHMS, TPE

PANASONIC, 6TPE470MI

2 7 C6, C9, C32, C54, C57,

C61, C65

CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

3 8 C7, C8, C20, C26, C27,

C31, C43, C45

CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D

4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS

6 8 C55, C56, C58, C59, C62,

C63, C66, C67

CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC

7 4 L5-L8 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,

8A, 6mOHMS, 1812

WURTH ELEKTRONIK, 74279226101

8 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

9 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED

10 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED

11 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

12 1 R9 RES., 0 OHM, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED

13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,

SENSE, AEC-Q200

VISHAY, WSHP2818R0200FEA

14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED

(DEMO BOARD DC2874A-A)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED

17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF

Hardware: For Demo Board Only

1 12 E1-E3, E5, E12, E14-E17,

E19-E21

TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2308-2-00-80-00-00-07-0

2 11 E4, E7, E10, E13, E18,

E22-E24, E26-E28

TEST POINT, TURRET, 0.094" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2501-2-00-80-00-00-07-0

3 5 E6, E8, E9, E11, E25 STUD, #10-32, FASTENER, 0.625" LENGTH PENCOM, PR1422

4 1 JP1 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121

5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831

6 5 MP5-MP9 CONN RING FLAT 8AWG #10 CRIMP MOLEX, 0192210223

7 10 MP10-MP19 NUT, HEX, #10-32, BRASS PENCOM, NU1132

8 5 MP20-MP24 WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526

9 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

(DEMO BOARD DC2874A-A)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C2, C16, C36 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D

2 6 C3, C10, C17, C37, C42,

C49

CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L

3 6 C4, C5, C18, C21, C38,

C41

CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A

5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A

7 6 C29, C46-C48, C50, C51 CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D

8 3 L1-L3 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,

1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 1 L8 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,

8A, 6mOHMS, 1812

WURTH ELEKTRONIK, 74279226101

10 1 R2 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

11 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED

12 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED

13 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC

14 2 R9, R12 RES., 243k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402243KFKED

15 2 R10, R11 RES., 174k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402174KFKED

16 3 U1-U3 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF

Additional Demo Board Circuit Components

1 6 C6, C9, C32, C57, C61,

C65

CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

2 6 C7, C8, C20, C26, C27,

C45

CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D

3 5 C15, C39, C60, C64, C68 CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,

18mOHMS, TPE

PANASONIC, 6TPE470MI

4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS

6 6 C58, C59, C62, C63, C66,

C67

CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC

7 2 L6, L7 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,

8A, 6mOHMS, 1812

WURTH ELEKTRONIK, 74279226101

8 5 MP5-MP9 CONN RING FLAT 8AWG #10 CRIMP MOLEX, 0192210223

9 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

10 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED

11 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED

12 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,

SENSE, AEC-Q200

VISHAY, WSHP2818R0200FEA

(DEMO BOARD DC2874A-B)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED

16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED

17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF

Hardware: For Demo Board Only

1 12 E1-E3, E5, E12, E14-E17,

E19-E21

TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2308-2-00-80-00-00-07-0

2 11 E4, E7, E10, E13, E18,

E22-E24, E26-E28

TEST POINT, TURRET, 0.094" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2501-2-00-80-00-00-07-0

3 5 E6, E8, E9, E11, E25 STUD, #10-32, FASTENER, 0.625" LENGTH PENCOM, PR1422

4 1 JP1 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121

5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831

6 10 MP10-MP19 NUT, HEX, #10-32, BRASS PENCOM, NU1132

7 5 MP20-MP24 WASHER, #10, LOCK, EXT, TIN FINISH PENCOM, WA4526

8 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

(DEMO BOARD DC2874A-B)

DEMO MANUAL DC2874A-A/

DC2874A-B/DC2874A-C

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C2, C16 CAP., 1uF, X6S, 6.3V, 20%, 0201 MURATA, GRM033C80J105ME05D

2 4 C3, C10, C17, C49 CAP., 47uF, X5R, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L

3 4 C4, C5, C18, C21 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

4 1 C11 CAP., 6.8pF, C0G/NP0, 50V, +/-0.5pF, 0402 AVX, 04025A6R8DAT2A

5 1 C12 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

6 1 C14 CAP., 390pF, COG, 50V, 5%, 0402 AVX, 04025A391JAT2A

7 4 C29, C46-C48 CAP., 0.47uF, X7S, 10V, 10%, 0402 MURATA, GCM155C71A474KE36D

8 2 L1, L2 IND., 0.1uH, PWR, SHIELDED, 20%, 25.8A,

1.8mOhms, 4.3x4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 1 L7 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,

8A, 6mOHMS, 1812

WURTH ELEKTRONIK, 74279226101

10 1 R2 RES., 100k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

11 1 R4 RES., 274k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402274KFKED

12 1 R6 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED

13 1 R8 RES., 10k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKEDC

14 2 U1, U2 IC, Low Voltage Syn. Step-Down Reg, LQFN-18 ANALOG DEVICES, LTC3310SEV#PBF

Additional Demo Board Circuit Components

1 5 C6, C9, C32, C57, C61 CAP., 0.1uF, X5R, 25V, 10%, 0402 SAMSUNG, CL05A104KA5NNNC

2 4 C7, C8, C26, C27 CAP., 0.01uF, X7R, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D

3 4 C15, C39, C60, C68 CAP., 470uF, TANT. POSCAP, 6.3V, 20%, 7343,

18mOHMS, TPE

PANASONIC, 6TPE470MI

4 1 C19 CAP., 22uF, X5R, 25V, 20%, 0805 SAMSUNG, CL21A226MAQNNNE

5 0 C22 CAPACITOR, OPT, 3-PIN 0402, FILTER/BYPASS

6 4 C58, C59, C62, C63 CAP., 10uF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC

7 1 L6 IND., 100 OHMS@100MHz, FERRITE BEAD, 25%,

8A, 6mOHMS, 1812

WURTH ELEKTRONIK, 74279226101

8 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

9 1 R1 RES., 1M OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED

10 1 R3 RES., 249k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED

11 1 R7 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

12 1 R11 RES., 0 OHM, 1/16W, 0402, AEC-Q200 NIC, NRC04ZOTRF

13 2 R16, R18 RES., 0.02 OHM, 1%, 10W, 2828, PWR, METAL,

SENSE, AEC-Q200

VISHAY, WSHP2818R0200FEA

14 1 R17 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

15 1 R19 RES., 51 OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040251R0JNED

16 1 RG1 RES., 20 OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED

17 1 U5 IC OPAMP BUFFER 20MHZ 8DFN ANALOG DEVICES, LT1010CDD#PBF

(DEMO BOARD DC2874A-C)

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