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  9. Analog Devices DC3164A-B Quick setup guide

Analog Devices DC3164A-B Quick setup guide

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1
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
2
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.
1.
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
2.
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.
5.
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%.
6.
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.
7.
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.
3
DEMO MANUAL DC3164A-B
Rev. 0
Figure1. Proper Measurement Equipment Setup
Figure2. Measuring Output Voltage Ripple
QUICK START PROCEDURE
+ –
VOUT GND
COUT
4
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
3M
OPT
OPT
OPT
332k
OPT
FB2,3,4
PG1,2,3,4
RUN1,2,3,4
LTM4710-1
V
IN1,2,3,4
GND
MODE1
MODE2,3,4
COMP1a,2a,3a,4a
FB1
V
OSNS1
V
OUT1,2,3,4
RT1
COMP1b
RT2
RT3
RT4
AGND1,2,3,4
×4
V
OUT
0.5V, 32A
(1.5MHz)
(90° PHASE SHIFT)
(180° PHASE SHIFT)
(270° PHASE SHIFT)
V
IN
V
IN
PGOOD
×4
5
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
(c) VOUT3 = 1.2V (d) VOUT4 = 1.5V
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)
0
1
2
3
4
5
6
7
8
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 5.5V
dc3164ab F04a
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 5.5V
dc3164ab F04b
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 5.5V
dc3164ab F04c
0
1
2
3
4
5
6
7
8
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 5.5V
dc3164ab F04d
LOAD CURRENT (A)
6
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
(c) VOUT3 = 1.2V (d) VOUT4 = 1.5V
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
7
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
(c) VOUT3 = 1.2V (d) VOUT4 = 1.5V
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
8
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
(c) VOUT3 = 1.2V, IOUT3 = 8A (d) VOUT4 = 1.5V, IOUT4 = 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
9
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
10
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