Analog Devices DC3164A-B Quick setup guide

DEMO MANUAL DC3164A-B

Rev. 0

DESCRIPTION

LTM4710-1

Low VIN, Quad 8A Silent Switcher

µModule Regulator

Demonstration circuit 3164A-B features the LTM

4710-1,

a quad DC/DC step-down µModule

regulator with 8A per

output, packaged in a compact (6mm × 12mm×3.54mm)

land grid array (LGA) with pre-made solder balls.

DC3164A-B has an operating input range of 2.5V to 5.5V.

The outputs of the four channels are 0.8V, 1.0V, 1.2V, and

1.5V with 8A per output, respectively. All outputs volt-

ages are programmable from 0.5V up to 3.6V (step-down

only). DC3164A-B operates by default at 1.5MHz and can

be adjusted by an external resistor from 1MHz to 5MHz or

by being synchronized to an external clock from 1.2MHz

to 2.6MHz. DC3164A-B also allows for the channels to be

paralleled up to 32A load current.

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

BOARD PHOTO

LTM4710-1 integrates four separate constant-frequency

peak current mode control regulators, power MOSFETs,

inductors, and other supporting discrete components.

It employs the second-generation Silent Switcher

technologyin which it allows fast switching edges for high

efficiency at high switching frequencies, while simulta-

neously achieving good EMI performance. Refer to the

LTM4710-1 data sheet for more detailed information.

It is recommended to read the data sheet of the LTM4710-1

prior to making any changes to the DC3164A-B board.

Design files for this circuit board are available.

Part marking is either ink mark or laser mark

DEMO MANUAL DC3164A-B

Rev. 0

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Specifications are at TA= 25°C, no forced-air cooling

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range VIN 2.5 5.5 V

Default Switching Frequency 1.5 MHz

Maximum Output Current For Each Channel 8 A

Output Voltage of Channel 1, VOUT1 0.8 V

Output Voltage of Channel 2, VOUT2 1.0 V

Output Voltage of Channel 3, VOUT3 1.2 V

Output Voltage of Channel 4, VOUT4 1.5 V

Efficiency of Channel 1 VIN = 3.3V, fSW = 1.5MHz, VOUT1 = 0.8V, IOUT1 = 8A 85.1 %

Efficiency of Channel 2 VIN = 3.3V, fSW = 1.5MHz, VOUT2 = 1.0V, IOUT2 = 8A 85.8 %

Efficiency of Channel 3 VIN = 3.3V, fSW = 1.5MHz, VOUT3 = 1.2V, IOUT3 = 8A 87.8 %

Efficiency of Channel 4 VIN = 3.3V, fSW = 1.5MHz, VOUT4 = 1.5V, IOUT4 = 8A 89.2 %

Demonstration circuit 3164A-B is easy to set up to evalu-

ate the performance of the LTM4710-1. See Figure1 for

the proper measurement equipment setup and follow the

procedure below.

With power off, place the jumpers as shown in the

following positions.

NAME POSITION NAME POSITION

RUN1 ON MODE1 CCM

RUN2 ON MODE2 CCM

RUN3 ON MODE3 CCM

RUN4 ON MODE4 CCM

DAC ENABLE OFF

With power off, (see Figure1), connect the input

power supply between VIN and GND. Connect the out-

put loads between VOUT1 and GND, VOUT2 and GND,

VOUT3 and GND, and VOUT4 and GND, respectively.

3. Connect the DMMs to the input and outputs.

4. Turn on the input power supply.

NOTE: The input voltage should be between 2.5V

and5.5V.

Check for the proper output voltages. The output

voltage meters for each channel should display the

programmed output voltages (VOUT1 = 0.8V, VOUT2=

1.0V, VOUT3 = 1.2V, VOUT4 = 1.5V) within ±1.5%.

Once the input and output voltages are properly

established, adjust the load current within the operat-

ing range of 0A to 8A max for each channel. Observe

the output voltage regulation, output voltage ripples,

load transient response and other parameters.

Vary the input voltage from 2.5V to 5.5V. Observe the

output voltage regulation.

NOTE: When measuring the output or input voltage rip-

ple, do not use the long ground lead on the oscilloscope

probe. See Figure2 for the proper scope probe technique.

Short, stiff leads need to be soldered to the (+) and (–)

terminals of an output capacitor. The probe’s ground ring

needs to touch the (–) lead and the probe tip needs to

touch the (+) lead.

OPTIONAL: An input EMI filter is included on the board.

To include this filter, connect the input supply positive

terminal to VEMI. Connect the input positive supply to

VIN to exclude the input EMI filter.

DEMO MANUAL DC3164A-B

Rev. 0

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Output Voltage Ripple

QUICK START PROCEDURE

+ –

VOUT GND

COUT

DEMO MANUAL DC3164A-B

Rev. 0

MULTIPHASE CONFIGURATION

For output loads that demand more than 8A of current,

multiple LTM4710-1 channels can be paralleled to run out

of phase to provide more output current without increas-

ing input and output voltage ripples. Figure3 shows the

typical paralleled application where channel 1 is used as

the main channel and the rest of LTM4710-1 channels

are programmed as the subordinary channels to achieve

the same switching frequency, interleaved phase shift and

current sharing among different channels.

The RT pin of the main phase is connected to a resistor

to AGND, programming the frequency and configuring

the MODE pin to become clock output used to drive the

MODE pin of the subordinary phase(s).

Connecting the FB pin to VIN configures a phase as a

subordinary phase. The MODE becomes an input, and the

voltage control loop is disabled. The subordinary phase

current control loop is still active, and the peak current

is controlled via the shared COMP node. The phase shift

of a subordinary phase relative to the main phase is pro-

grammed with a resistor divider on the RT pin. Refer to

the LTM4710-1 data sheet for more detailed information.

Figure3. Paralleled Single Output, 0.5V, 32A DC/DC μModule Regulator

VIN

2.5V TO

5.5V

dc3164ab F03

PINS NOT SHOWN IN THIS CIRCUIT: SSTT, SW; COMP2b, COMP3b, COMP4b NO CONNECTION.

100k

22µF

0Ω

100µF

536k

OPT

332k

OPT

FB2,3,4

PG1,2,3,4

RUN1,2,3,4

LTM4710-1

IN1,2,3,4

GND

MODE1

MODE2,3,4

COMP1a,2a,3a,4a

FB1

OSNS1

OUT1,2,3,4

RT1

COMP1b

RT2

RT3

RT4

AGND1,2,3,4

×4

OUT

0.5V, 32A

(1.5MHz)

(90° PHASE SHIFT)

(180° PHASE SHIFT)

(270° PHASE SHIFT)

PGOOD

×4

DEMO MANUAL DC3164A-B

Rev. 0

Figure4. Measured Efficiency of Each Channel (fSW = 1.5MHz), No Forced Air Cooling with TA= 25°C

(a) VOUT1 = 0.8V (b) VOUT2 = 1.0V

Figure5. Thermal Performance of 0.8V, 1.0V, 1.2V, and 1.5V with 8A per Output

(VIN = 3.3V, fSW = 1.5MHz), TA= 25°C, No Forced Air Cooling

TYPICAL PERFORMANCE CHARACTERISTICS

LOAD CURRENT (A)

100

EFFICIENCY (%)

= 2.5V

= 3.3V

= 5.0V

= 5.5V

dc3164ab F04a

LOAD CURRENT (A)

100

EFFICIENCY (%)

= 2.5V

= 3.3V

= 5.0V

= 5.5V

dc3164ab F04b

LOAD CURRENT (A)

100

EFFICIENCY (%)

= 2.5V

= 3.3V

= 5.0V

= 5.5V

dc3164ab F04c

100

EFFICIENCY (%)

= 2.5V

= 3.3V

= 5.0V

= 5.5V

dc3164ab F04d

LOAD CURRENT (A)

DEMO MANUAL DC3164A-B

Rev. 0

Figure6. Load Transient Responses with Load Steps 0A to 2A to 0A, dI/dt = 2A/µs (VIN = 3.3V, fSW = 1.5MHz)

(a) VOUT1 = 0.8V (b) VOUT2 = 1.0V

TYPICAL PERFORMANCE CHARACTERISTICS

dc3164ab F06a

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F06b

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F06c

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F06d

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

DEMO MANUAL DC3164A-B

Rev. 0

Figure7. Load Transient Responses with Load Steps 6A to 8A to 6A, dI/dt = 2A/µs (VIN = 3.3V, fSW = 1.5MHz)

(a) VOUT1 = 0.8V (b) VOUT2 = 1.0V

TYPICAL PERFORMANCE CHARACTERISTICS

dc3164ab F07a

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F07b

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F07c

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

dc3164ab F07d

50μs/DIV

LOAD STEP

5A/DIV

VOUT

50mV/DIV

DEMO MANUAL DC3164A-B

Rev. 0

Figure8. Output Voltage Ripple (VIN = 3.3V, fSW = 1.5MHz, 350MHz BW)

(a) VOUT1 = 0.8V, IOUT1 = 8A (b) VOUT2 = 1.0V, IOUT2 = 8A

TYPICAL PERFORMANCE CHARACTERISTICS

dc3164ab F08a

500ns/DIV

VOUT

10mV/DIV

dc3164ab F08b

500ns/DIV

VOUT

10mV/DIV

dc3164ab F08c

500ns/DIV

VOUT

10mV/DIV

dc3164ab F08d

500ns/DIV

VOUT

10mV/DIV

DEMO MANUAL DC3164A-B

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 12 C1, C3-C5, C18-C19, C47-C49,

C54, C62-C63

CAP., 22µF, X5R, 10V, 20%, 0603 SAMSUNG, CL10A226MP8NUNE

2 1 C2 CAP., 150µF, ALUM POLY, OS-CON, 10V, 20%,

8mm × 6.9mm, E7, SMD, RADIAL, SVP

PANASONIC, 10SVP150MX

3 5 C8, C25-C26, C45-C46 CAP., 0.1µF, X7R, 50V, 10%, 0603 TDK, C1608X7R1H104K080AA

4 4 C10, C16, C29, C35 CAP., 22µF, X5R, 6.3V, 20%, 0805 TDK, C2012X5R0J226M125AC

5 4 C11, C15, C30, C34 CAP.,47µF, X5R, 6.3V, 20%, 0603, NO SUBS. ALLOWED MURATA, GRM188R60J476ME15D

6 4 C12, C14, C33, C38 CAP., 100µF, X6S, 4V, 20%, 0805 MURATA, GRM21BC80G107ME15L

7 2 C55, C56 CAP., 47µF, X5R, 10V, 20%, 0805 TDK, C2012X5R1A476M125AC

8 4 CFFW1, CFFW2, CFFW3, CFFW4 CAP., 68pF, C0G, 25V, 10%, 0603 KEMET, C0603C680K3GACTU

9 15 R1-R2, R7-R8, R14-R16, R72,

R78-R81, R85, R88, R90

RES., 0Ω, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEY0R00V

10 1 R3 RES., 16.5k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060316K5FKEA

11 8 R27, R29-R31, R68, R69-R71 RES., 10k, 5%, 1/10W, 0603 YAGEO, RC0603JR-0710KL

12 4 R60-R63 RES., 10Ω, 1%, 1/10W, 0603 YAGEO, RC0603FR-0710RL

13 4 RBT2, RTP2, RTP3, RTP4 RES., 10k, 1%, 1/10W, 0603 YAGEO, RC0603FR-0710KL

14 1 RBT3 RES., 7.15k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF7151V

15 1 RBT4 RES., 4.99k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4991V

16 1 RSET1 RES., 24.9k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF2492V

17 1 RT1 RES., 536k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF5363V

18 1 L1 IND., 98Ω AT100MHz, FERRITE BEAD, 25%, 18A,

0.9mΩ, 1LN, 7847

WURTH ELEKTRONIK, 7427932

19 1 U1 IC, LOW VIN QUAD 8A Silent Switcher µModule, BGA ANALOG DEVICES, LTM4710EV-1#PBF

20 1 U2 IC, MULTIPHASE OSC WITH FREQ MOD, MSOP-10 ANALOG DEVICES, LTC6902CMS#PBF

Additional Demo Board Circuit Components

1 0 C9, C17, C28, C36 CAP., OPTION, 1206

2 0 C50-C53, C57-C60 CAP., OPTION, 1210

3 0 C61 CAP., OPTION, 0805

4 0 CITH1-CITH4, CITHP1-CITHP4 CAP., OPTION, 0603

5 0 R9-R10, R13, R17-R18,

R32-R35, R37-R40, R42- R45,

R65-R66, R77, R82-R83,

R91-R94, RITH1-RITH4, RMOD1,

RT2-RT4

RES., OPTION, 0603

6 0 R36, R41, R46 RES., OPTION, 2512

7 0 R95-R98 RES., OPTION, 2010

DEMO MANUAL DC3164A-B

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware for Demo Board Only

1 23 E1-E18, E20-E23, E25 TEST POINT, TURRET, 0.094" MTG. HOLE,

PCB 0.062" THK

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

2 11 J1-J7, J9-J12 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,

SWAGE, 0.218"

KEYSTONE, 575-4

3 1 J16 CONN., HDR, SHROUDED, MALE, 2×6, 2mm,

VERT, ST, THT

AMPHENOL, 98414-G06-12ULF

4 5 JP1-JP4, JP9 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, THT, NO

SUBS. ALLOWED

WURTH ELEKTRONIK, 62000311121

5 4 JP5-JP8 CONN., HDR, MALE, 2×2, 2mm, VERT, ST, THT, 10μ Au SAMTEC, TMM-102-02-L-D

6 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831

7 1 PCB1 PCB, DC3164A ANALOG DEVICES APPROVED SUPPLIER,

600-DC3164A

8 9 XJP1-XJP9 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421

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