Analog Devices DC3186A Guida rapida alla configurazione

DEMO MANUAL DC3186A

Rev. 0

DESCRIPTION

LTC3311

3.3V to 1.2V at 50A, 37.5A, 25A Multiphase

2MHz Automotive Low EMI Buck Regulator

Demonstration Circuit 3186A features the LT C

3311

12.5A, low voltage synchronous step-down Silent

Switcher

operating as a multiphase 2MHz, 3V to 5.5V

input, 1.2V buck regulator. The DC3186A has three build

options to provide a two phase 25A, three phase 37.5A,

or four phase 50A output solution. The LTC3311 supports

adjustable output voltages from 0.5V to VIN and operat-

ing frequencies from 500kHz up to 5MHz in multiphase

operation. All phases of DC3186A operate in forced con-

tinuous mode.

The DC3186A also has an EMI filter to reduce conducted

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

voltage at the VIN EMI terminal. All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

The Efficiency vs Load graph shows the efficiency of the

circuit with a 3.3V input for all three build options.

An on-board transient circuit is included to measure fast

transient performance.

The LTC3311 data sheet gives a complete description

of the part, its operation, and application information.

The data sheet must be read in conjunction with this

demo manual. The LTC3311 is assembled in a 3mm ×

3mm LQFN package 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. T Y P. MAX. UNITS

VIN/VIN EMI DC3186A Input Voltage Range 3 5.5 V

VOUT DC3186A Output Voltage Range 1.176 1.2 1.224 V

IOUT DC3186A Output Current DC3186A-A, 4-Phase Build Option, VIN ≥ 3V

DC3186A-B, 3-Phase Build Option, VIN ≥ 3V

DC3186A-C, 2-Phase Build Option, VIN ≥ 3V

37.5

fSW Switching Frequency 1.8 2.2 MHz

EFF Efficiency VIN = 3.3V, IOUT = 15A, 4-Phase 92.5 %

DEMO MANUAL DC3186A

Rev. 0

QUICK START PROCEDURE

Refer to Figure1 for the proper measurement equipment

setup and follow the procedure below:

NOTE:For accurate V

, V

OUT

and efficiency measure-

ments, measure VIN at the VIN SNSE and GND SNSN

turrets, and measure VOUT at the VOUT SNSE and GND

SNSE turrets, as illustrated as VM1 and VM2 in Figure1.

When measuring the input or output 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. Set power supply PS1 current limit to 40A. Set the

electronic load LD1 to CC mode and 0A current. Slowly

increase PS1 to 1V. If PS1 output current reads less

than20mA,increasePS1to3.3V.VerifythatVM1reads

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

PS1 output current, and LD1 input current. Connect

an oscilloscope voltage probe as shown in Figure2.

Set Channel to AC-coupled, voltage scale to 20mV and

time base to 10µs. Check VOUT ripple voltage. Verify

that PGOOD voltage is above 3V.

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, 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

R16 (10mΩ). The DC3186A uses a buffered signal

generator input to drive a source follower circuit, and

to control the slew rate and amplitude of the current

transient. The source follower FET, Q1, operates in the

linear region during the load step.

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

on and set PS2 to 8V.

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

period and an amplitude from 0V to 4V, and then

connect it to 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.

8. Connect an oscilloscope with a time scale of 200µs/

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.

9. 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

falling edge of the pulse to provide the desired ramp

rate. Figure5 shows a load step from 10A to 20A in

1µs. Refer to the following equations:

OUT =

I_STEP

10mΩ

(1)

VGS = VSG_INPUT – VI_STEP (2)

10. When done, turn off SG1, PS1 and Load. Remove all

the connections to the demo board.

DEMO MANUAL DC3186A

Rev. 0

TEST SETUP

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

Figure1. Test Setup for DC3186A Demo Board

PS1

3.3V

40A

VM3

VM1

VM2

PS2

100mA

SCOPE

LD1

1.2V

50A

SG1

DEMO MANUAL DC3186A

Rev. 0

TYPICAL PERFORMANCE CHARACTERISTICS

Figure3. LTC3311 Multiphase Typical Solution Schematic

Figure4. DC3186A-A Thermal Performance with 40A Load at Room Temperature

LTC3311

VOUT

1.2V

50A

PGOOD

MODE/SYNC

ITH

PGOOD

MODE/SYNC

SSTT

ITH

22µF

×2

22µF

×2

0.01µF

0.01µF 22µF

L, 100nH

22µF

L, 100nH

22µF

0.1µF

3.32k

470pF

10µF 1µF

VIN

3V TO 5.5V

AGND PGNDSSTT

VIN

AGND PGND

140k

100k

6.8pF

274k

100k

PGOOD

22µF

249k

MASTER

PHASE

SLAVE

PHASES

dc3186a F03

L = COILCRAFT, XEL4030-101ME

DEMO MANUAL DC3186A

Rev. 0

Figure5. Efficiency vs Load Current Figure6. Load Step Response

= 2MHz

= 3.3V

4-PHASE

3-PHASE

2-PHASE

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc3186a F04

10A

20A

= 3.3V

5µs/DIV

LOAD

5A/DIV

OUT

50mV/DIV

dc3186a F05

TYPICAL PERFORMANCE CHARACTERISTICS

THEORY OF OPERATION

Introduction to the DC3186A

The DC3186A demonstration circuit features the LTC3311,

an automotive grade low voltage synchronous step-down

Silent Switcher in a two, three, or four phase operation.

The LTC3311 is a monolithic, constant frequency, current

mode step-down DC/DC converter. Connecting the RT pin

of the master phase with a resistor to AGND programs

the frequency from 500kHz to 5MHz. With RTresistor

on master phase, the MODE/SYNC pin becomes a clock

output to drive the MODE/SYNC pins of the slave phases.

The DC3186A can operate with an external clock by short-

ing the master phase RT pin to VIN with a 0Ω resistor in

the R5 location and applying a clock signal on the MODE/

SYNC turret. If the EN pin is low, the LTC3311 is in shut-

down and in a low quiescent current state. When the EN

pin is above its threshold, the switching regulator will be

enabled.

Connecting the FB pin to VIN configures a phase as a

slave. The MODE/SYNC pin becomes an input, and the

voltage control loop is disabled. The current control loop

in the slave phase 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 data sheet for more information on setting the slave

phase angle.

In the multiphase application, the LTC3311 operates in

forced continuous mode. At light loads, the slave phases

will continue to operate in forced continuous mode.

Setting the compensation for the multiphase is similar

to setting the compensation to the single phase. When

designing the compensation network, controlling the loop

stability and transient response are the two main con-

siderations. The LTC3311 has been designed to operate

at a high bandwidth for fast transient response capabili-

ties. This reduces output capacitance required to meet

the desired transient voltage range. The mid-band gain

of the loop increases with R8 and the bandwidth of the

loop increases with decreasing C14. C11 along with R6

provides a phase lead which will improve the phase mar-

gin. C13, C33, C34, and C44 along with R8 provides a

high frequency pole to reduce the high frequency gain.

C13, C33, C34, and C44 are in parallel on the ITH node.

The sum of these caps will be the total capacitance on the

master phase ITH pin. Too much capacitance will 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

DEMO MANUAL DC3186A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC3186A-A Required Circuit Components

1 4 C2, C16, C23, C36 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

2 17 C3-C5, C10, C17-C19, C21, C24, C25,

C28, C37, C38, C41, C42, C49, C52

CAP., 22µF, X7S, 6.3V, 20%, 0805 TDK, C2012X7S0J226M125AC

3 2 C6, C12 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

4 8 C7, C8, C20, C26, C27, C31, C43, C45 CAP., 0.01µF, X7R, 6.3V, 10%, 0201 AVX, 02016C103KAT2A

5 1 C11 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A

6 1 C14 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA

7 4 C30, C50, C51, C53 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

8 4 L1-L4 IND., 0.1µH, PWR, SHIELDED, 20%, 25.8A, 1.8mΩ,

4.3mm × 4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 1 R1 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 STACKPOLE ELECTRONICS, INC.,

RMCF0402FT1M00

10 3 R2, R11, R14 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1003TRF

11 1 R3 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2493TRF

12 1 R4 RES., 274k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2743TRF

13 1 R6 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1403TRF

14 1 R7 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J104TRF

15 1 R8 RES., 3.32k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3321X

16 4 R9, R15, R20, R21 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

17 2 R12, R13 RES., 301k, 1%, 1/16W, 0402 SAMSUNG, RC1005F3013CS

18 4 U1-U4 IC, LOW VOLTAGE SYN. STEPDOWN REG, LQFN-18 ANALOG DEVICES, LTC3311JV#PBF

Additional Demo Board Circuit Components

1 8 C1, C15, C29, C35, C39, C40, C60, C64 CAP., 470µF, TANT POLY, 6.3V, 20%, 7343 PANASONIC, 6TCE470MI

2 6 C9, C32, C54, C57, C61, C65 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

3 8 C46, C47, C55, C56, C58, C59, C62, C63 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

4 4 L5-L8 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 8A,

6mΩ, 1812

WURTH ELEKTRONIK, 74279226101

5 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

6 2 R16, R18 RES., 0.02Ω, 1%, 10W, 2818, HP, METAL, SENSE,

AEC-Q200

VISHAY, WSHP2818R0200FEA

THEORY OF OPERATION

margin goal of 8dB or greater. Refer to the LTC3311 data

sheet and LTPowerCAD for more information on choosing

the required components.

The soft-start 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

– 273

(3)

DEMO MANUAL DC3186A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

7 2 R17, R19 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J103TRF

8 1 RG1 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F20R0TRF

9 1 U5 IC, OPAMP BUFFER, 20MHz, ±150mA, DFN-8 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, 1 × 3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121

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

6 5 MP5-MP9 RING, LUG, #10, CRIMP, 8 AWG, FLAT, NON-

INSULATED, SOLDERLESS TERMINAL

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

DC3186A-B Required Circuit Components

1 3 C2, C16, C36 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

2 13 C3-C5, C10, C17-C19, C21, C37, C38,

C41, C42, C49

CAP., 22µF, X7S, 6.3V, 20%, 0805 TDK, C2012X7S0J226M125AC

3 2 C6, C12 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

4 6 C7, C8, C20, C26, C27, C45 CAP., 0.01µF, X7R, 6.3V, 10%, 0201 AVX, 02016C103KAT2A

5 1 C11 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A

6 1 C14 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA

7 3 C30, C50, C53 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

8 3 L1-L3 IND., 0.1µH, PWR, SHIELDED, 20%, 25.8A, 1.8mΩ,

4.3mm × 4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 1 R1 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 STACKPOLE ELECTRONICS, INC.,

RMCF0402FT1M00

10 1 R2 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1003TRF

11 1 R3 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2493TRF

12 1 R4 RES., 274k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2743TRF

13 1 R6 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1403TRF

14 1 R7 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J104TRF

15 1 R8 RES., 3.32k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3321X

16 2 R9, R12 RES., 243k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2433TRF

17 2 R10, R11 RES., 174k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1743TRF

18 2 R15, R20 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

19 3 U1-U3 IC, LOW VOLTAGE SYN. STEPDOWN REG, LQFN-18 ANALOG DEVICES, LTC3311JV#PBF

DEMO MANUAL DC3186A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Demo Board Circuit Components

1 5 C9, C32, C57, C61, C65 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

2 6 C15, C29, C39, C40, C60, C64 CAP., 470µF, TANT POLY, 6.3V, 20%, 7343 PANASONIC, 6TCE470MI

3 6 C46, C47, C58, C59, C62, C63 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

4 3 L6-L8 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 8A,

6mΩ, 1812

WURTH ELEKTRONIK, 74279226101

5 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

6 2 R16, R18 RES., 0.02Ω, 1%, 10W, 2818, HP, METAL, SENSE,

AEC-Q200

VISHAY, WSHP2818R0200FEA

7 2 R17, R19 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J103TRF

8 1 RG1 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F20R0TRF

9 1 U5 IC, OPAMP BUFFER, 20MHz, ±150mA, DFN-8 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, 1 × 3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121

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

6 5 MP5-MP9 RING, LUG, #10, CRIMP, 8 AWG, FLAT, NON-

INSULATED, SOLDERLESS TERMINAL

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

DC3186A-C Required Circuit Components

1 2 C2, C16 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

2 9 C3-C5, C10, C17-C19, C21, C49 CAP., 22µF, X7S, 6.3V, 20%, 0805 TDK, C2012X7S0J226M125AC

3 2 C6, C12 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

4 4 C7, C8, C26, C27 CAP., 0.01µF, X7R, 6.3V, 10%, 0201 AVX, 02016C103KAT2A

5 1 C11 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A

6 1 C14 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA

7 2 C30, C53 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

8 2 L1, L2 IND., 0.1µH, PWR, SHIELDED, 20%, 25.8A, 1.8mΩ,

4.3mm × 4.3mm, XEL4030, AEC-Q200

COILCRAFT, XEL4030-101MEB

9 1 R1 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 STACKPOLE ELECTRONICS, INC.,

RMCF0402FT1M00

10 1 R2 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1003TRF

11 1 R3 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2493TRF

DEMO MANUAL DC3186A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

12 1 R4 RES., 274k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2743TRF

13 1 R6 RES., 140k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1403TRF

14 1 R7 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J104TRF

15 1 R8 RES., 3.32k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3321X

16 2 R11, R15 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

17 2 U1, U2 IC, LOW VOLTAGE SYN. STEPDOWN REG, LQFN-18 ANALOG DEVICES, LTC3311JV#PBF

Additional Demo Board Circuit Components

1 4 C9, C32, C57, C61 CAP., 0.1µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

2 4 C15, C29, C39, C60 CAP., 470µF, TANT POLY, 6.3V, 20%, 7343 PANASONIC, 6TCE470MI

3 4 C58, C59, C62, C63 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

4 2 L6, L7 IND., 100Ω AT 100MHz, FERRITE BEAD, 25%, 8A,

6mΩ, 1812

WURTH ELEKTRONIK, 74279226101

5 1 Q1 XSTR., MOSFET, N-CH, 60V, 120A, TO-263 VISHAY, SUM50020E-GE3

6 2 R16, R18 RES., 0.02Ω, 1%, 10W, 2818, HP, METAL, SENSE,

AEC-Q200

VISHAY, WSHP2818R0200FEA

7 2 R17, R19 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J103TRF

8 1 RG1 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F20R0TRF

9 1 U5 IC, OPAMP BUFFER, 20MHz, ±150mA, DFN-8 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, ST, THT WURTH ELEKTRONIK, 62000311121

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

6 5 MP5-MP9 RING, LUG, #10, CRIMP, 8 AWG, FLAT, NON-

INSULATED, SOLDERLESS TERMINAL

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 MANUAL DC3186A

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

1.2V

VOUT

MODE/SYNC

GND

SSTT

PGOOD

GND

VOUT

GND

VOUT

SNSE

GND

SNSE

VIN

SNSE

GND

SNSE

(VIN MAX)

FSW = 2MHz

MASTER

SKU#

DO NOT

POPULATE

TPA

TPB

DNP

DESCRIPTION DATEREV

REVISION HISTORY

APPROVEDECO

SLAVE 3

NONE

SLAVE 2 & 3

R9 R10

R11 R12 R13 R14

DC3186A-A

DC3186A-B

DC3186A-C

0DNP100k 301k 301k 100k

174k243k

DNP

243k

174k

ASSEMBLY OPTIONS TABLE

* SEE TABLE

DNP

- 02 PRODUCTION 09/20/21

NOTES: UNLESS OTHERWISE SPECIFIED

1. RESISTORS: OHMS, 0402, 1%, 1/16W

2. CAPACITORS: 0402

25A

37.5A

IOUT

50A

DNP

# OF

PHASES

SLAVE 1 SLAVE 2 SLAVE 3

GND

VIN

3.0V - 5.5V

VIN

3.3V TO 1.2V AT 50A, 37.5A, 25A, MULTIPHASE 2MHz AUTOMOTIVE

LOW EMI BUCK REGULATOR IN A 1.18cm² PER PHASE SOLUTION

MODECOM

VOUT

ITH PGOOD

VIN

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

710-DC3186A_REV02

N/A

LTC3311

09/20/21DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

710-DC3186A_REV02

N/A

LTC3311

09/20/21DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

710-DC3186A_REV02

N/A

LTC3311

09/20/21

0.1uF

JP1

LTC3311JV

SW 6

FB 18

ITH

MODE/SYNC

RT 15

PGOOD 14

SSTT

VIN

PGND

AGND

VIN

4SW 7

SW 8

SW 9

PGND

1uF

0201

100K

E10

C19

22uF

0805

0.1uH

XEL4030-101MEB

140k

100k

E14

0.01uF

0201

C12

0.1uF

TP1

C13

OPT

JP2

E24

274k

C11

6.8pF

E15

OPT

E16

E13

E25

E12

22uF

0805

E11

E21

22uF

0805

C53

10uF

0603 RG1

22uF

0805

249k

3.32k

E17

C14

470pF

0.1uF

C10

22uF

0805

0.01uF

0201

VFB1

RT1

SW1

VIN

VOUT

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