DC1753A - Demo Manual

DEMO MANUAL DC1753A
LTC3880EUJ
Dual Phase Step-Down
DC/DC Controller with
Digital Power Management
Description
Demonstration circuit 1753A is a dual phase single-output,
synchronous buck converter featuring the LTC®3880EUJ,
a dual phase current mode controller with digital power
management. There are two versions of the board available:
n
n
DC1753A-A: senses inductor current across a sense
resistor. Default switching Freq = 350kHz
DC1753A-B: senses inductor current with the inductor
DCR. Default switching Freq = 425kHz
evaluation of the DC/DC converter aspects of the LTC3880.
To fully explore the extensive digital power management
features of the part, download the LTpowerPlay™ GUI
software onto your PC and use LTC’s I2C/SMBus/PMBus
dongle DC1613A to connect to the board. LTpowerPlay
allows the user to reconfigure the part on-the-fly and store
the configuration in EEPROM, view telemetry of voltage,
current, temperature and fault status.
Either version can be populated with the LTC3880EUJ-1,
which allows the user to provide bias power to the IC from
an external power supply.
GUI DOWNLOAD
The output voltage of the board can be programmed from
0.5V to 3.3V, with output current up to 40A. The factory
default setting for the output is 1.8V.
For more details and instructions of LTpowerPlay, please
refer to the LTpowerPlay for LTC3880 Quick Start Guide.
The DC1753A powers up to default settings and produces power based on configuration resistors without the
need for any serial bus communication. This allows easy
Performance Summary
The software can be downloaded from:
http://www.linear.com/ltpowerplay
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Specifications are at TA = 25°C
SYMBOL
PARAMETER
VIN
Input Supply Range
CONDITIONS
MIN
TYP
MAX
6.5
12
24
V
VOUT
Output Voltage Range
IOUT = 0A to 20A, VIN = 6.5V to 24V
0.5
1.8
3.3
V
VOUT_ACCURACY
Output Voltage Accuracy
IOUT = 0A to 20A, VIN = 6.5V to 24V
VOUT for 0.5V to 3.3V
IOUT
Output Current Range
fSW, A
Factory Default Switching, Freq: A (RSENSE)
350
kHz
fSW, B
Factory Default Switching, Freq: B (DCR)
425
kHz
EFFICIENCY
Peak Efficiency
91.8
%
±0.5
0
VOUT = 1.8V, See Figures 6 and 7
UNITS
%
40
A
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1
DEMO MANUAL DC1753A
Quick Start Procedure
Demonstration circuit 1753A makes it easy to evaluate
the performance of the LTC3880. Refer to Figure 3 for
proper measurement equipment setup and follow the
procedure below.
NOTE: 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 C20 or C23. See
Figure 5 for the proper scope probe technique.
1. Make sure jumpers are in the following positions:
JUMPER
JP1
POSITION FUNCTION
OFF
Write Protection of LTC3880
JP3
ON
LED Indicator
JP4
OFF
EXTVCC_DRV: External VCC for the LTC3880-1
JP5
C
GPIO0B to GPIO1B: Tie GPIOs Together
2. With power off, connect the input power supply to
VIN and GND. Connect active load to outputs.
3. Make sure RUN switch is OFF.
4. Turn on the power at the input..
5. Turn on the RUN switch as desired.
6. Check for the correct output voltages. VOUT = 1.8V
± 0.5%.
NOTE: If there is no output, temporarily disconnect
the load to make sure that the load is not set too high.
7. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
8. Connect the dongle and control the output voltages
from the GUI. See next section for details.
CONNECTING A PC TO DC1753A
You can use a PC to reconfigure the power management
features of the LTC3880, such as: nominal VOUT, margin
set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIOs and
other functionality. The DC1613A dongle may be plugged
in regardless of whether or not VIN is present.
NOTE: Make sure that the input voltage does not exceed 24V.
+12V
Power Supply
USB CABLE
VIN
12-PIN J10
USB to
I2C/PMBus Dongle
CONNECTOR
DC1613A
LTC3880
Demo Board
DC1753A
VOUT
LOAD
dc1753a F01
Figure 1. Demo Setup with PC
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2
DEMO MANUAL DC1753A
quick start procedure
Plug the dongle into the correct connector. The dongle
can be hot plugged.
DC1613A
Connector
dc1753a F02
Figure 2. Dongle Connector Locations
RUN
SWITCH
V
V
VOUT
Load
SHUNT
A
V
POWER
SUPPLY
dc1753a F03
Figure 3. Dual Phase Single-Output Test Setup
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3
DEMO MANUAL DC1753A
quick start procedure
Combining DC1753A with Other Digital Power Demo
Boards
The DC1753A may be plugged together in a multiboard
array with other digital power boards using J7 and J8.
Measuring Efficiency
To accurately measure efficiency of any configuration, do
the following:
Remove R65 (bleeder resistor on bottom side of board).
To use the on-board LDO to drive INTVCC, make the
following modifications to the demo board:
n
n
n
n
Measure VIN across the input ceramic capacitor (C18,
C19). Measure VOUT across the output ceramic capacitor (C24, C25).
n
n
n
n
Evaluating the LTC3880-1
For applications that require the highest possible efficiency, the LTC3880-1 allows the user to supply the
bias current and gate driver current from an external
power supply. Connect the power supply, 4.8V to 5.2V,
to the INTVCC/EXTVCC pin. Obtain a DC1753A with an
LTC3880-1 installed from your Linear Technology Field
Applications Engineer.
Install R60.
To accurately measure efficiency of a demo board containing an LTC3880-1:
n
Set JP3 to OFF to disable the regulator that provides
power to LEDs.
Set JP4 to ON so that U7 provides the drive to
INTVCC. U7 takes the place of the external power supply.
Drive INTVCC from an external source through the
pin named: INTVCC/EXTVCC. Install R60, R65 if
installed
Set JP4 to OFF to disable U7.
Set JP3 to OFF to disable the regulator that provides
power to LEDs.
Measure VIN across the input ceramic capacitor (C18,
C19). Measure VOUT across the output ceramic capacitor (C24, C25).
Measuring Output Ripple Voltage
An accurate ripple measurement may be performed by
using the configuration in Figure 5 across C20 or C23.
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DEMO MANUAL DC1753A
quick start procedure
JP3
JP4
INTVCC/
EXTVCC
R60
dc1753a F04
Figure 4. Jumper Locations: JP3, JP4, R60, INTVCC/EXTVCC Turret
+
VOUT
–
COUT
GND
dc1753a F05
Figure 5. Measuring Output Voltage Ripple
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5
DEMO MANUAL DC1753A
quick start procedure
92
91
90
89
EFFICIENCY (%)
88
87
86
85
84
12VIN, 1.8VOUT, 350kHz, RSENSE
83
12VIN, 1.5VOUT, 350kHz, RSENSE
82
12VIN, 1.2VOUT, 350kHz, RSENSE
81
12VIN, 1.0VOUT, 350kHz, RSENSE
80
0
5
10
15
20
25
30
35
OUTPUT CURRENT (A)
40
dc1753a F06
Figure 6. Typical Efficiency Curves, Sense Resistor Current Sensing, 12VIN, fSW = 350kHz
92
91
90
89
EFFICIENCY (%)
88
87
86
85
84
12VIN, 1.8VOUT, 425kHz, DCR SENSE
83
12VIN, 1.5VOUT, 425kHz, DCR SENSE
82
12VIN, 1.2VOUT, 425kHz, DCR SENSE
81
12VIN, 1.0VOUT, 425kHz, DCR SENSE
80
0
5
10
15
20
25
30
35
OUTPUT CURRENT (A)
40
dc1753a F07
Figure 7. Typical Efficiency Curves, DCR Current Sensing, 12VIN, fSW = 425kHz
dc1753af
6
DEMO MANUAL DC1753A
quick start procedure
LTpowerPlay Software GUI
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology digital power
ICs with EEPROM, including the LTC3880, LTC2974 and
LTC2978, the quad and octal PMBus power supply managers. The software supports a variety of different tasks.
You can use LTpowerPlay to evaluate Linear Technology
ICs by connecting to a demo board system. LTpowerPlay
can also be used in an offline mode (with no hardware
present) in order to build a multichip configuration file that
can be saved and reloaded at a later time. LTpowerPlay
provides unprecedented diagnostic and debug features. It
becomes a valuable diagnostic tool during board bring-up
to program or tweak the power management scheme in
a system, or to diagnose power issues when bringing up
rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus
controller to communicate with one of many potential
targets, including the LTC2974’s DC1978A demo system,
or a customer board. The software also provides an automatic update feature to keep the software current with
the latest set of device drivers and documentation. The
LTpowerPlay software can be downloaded from:
http://linear.com/ltpowerplay
To access technical support documents for LTC Digital
Power Products visit Help. View online help on the
LTpowerPlay menu.
Figure 8. LTpowerPlay Software GUI
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DEMO MANUAL DC1753A
GUI quick start procedure
LTpowerPlay Software GUI
The following procedure describes how to use LTpowerPlay
to monitor and change the settings of LTC3880.
d.To change the output voltage to a different value, like
1.5V: In the Config tab, type 1.5 in the VOUT_COMMAND
box, like this:
1. Download and install the LTPowerPlay GUI:
http://linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the LTC3880. The
system tree on the left hand side should look like this:
b.A green message box shows for a few seconds in the
lower left hand corner, confirming that the LTC3880 is
communicating:
Then, click the “W” (PC to RAM) icon to write these register
values to the LTC3880. After finishing this step, you will
see the output voltage will change to 1.5V.
If the write is successful, this message appears:
c. In the tool bar, click the “R” (RAM to PC) icon to read
the RAM from the LTC3880. This reads the configuration
from the RAM of LTC3880 and loads it into the GUI.
e. To save the changes into the NVM: In the tool bar, click
the “RAM to NVM” button:
f. Save the demo board configuration to a (*.proj) file by
clicking the Save icon. Name it whatever you want.
dc1753af
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DEMO MANUAL DC1753A
GUI quick start procedure
Loading a LTC3880 Configuration (*.proj) File with the GUI
n
In the upper left hand corner of the GUI: File > Open > browse
to your *.proj file. This will load the file into the GUI.
n
n
n
Click the “Go On Line” button to link the GUI to the
existing LTC3880, as this:
Click on the “W” (PC to RAM) button. This loads the
configuration into LTC3880 RAM.
Then, you can save the configuration to the EEPROM.
Please see previous step f for details.
Parts List
DC1753A-A
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
3
C1, C2, C6
CAP., X7R, 0.1µF, 50V, 10%, 0603
AVX, 06035C104KAT2A
2
1
C17
CAP., X7R, 0.22µF, 25V, 10%, 0603
TDK, C1608X7R1E224K
3
2
C3, C9
CAP., X7R, 1µF, 16V, 10%, 0603
AVX, 0603YC105KAT2A
4
1
C5
CAP., X5R, 4.7µF, 25V, 0805
TAIYO YUDEN, TMK212BJ475KG-T
5
1
C8
CAP., X7R, 4700pF, 10%, 50V, 0603
AVX, 06035C472KAT2A
6
4
C10, C29, C11, C30
CAP., POSCAP, 330µF, 6.3V, D3L
SANYO, 6TPF330M9L
7
1
C13
CAP., OS-CON,150µF, 35V
SUNCON, 35HVP150M
8
4
C20, C23-C25
CAP., X5R, 100µF, 6.3V, 1210
AVX, 12106D107MAT2A
9
3
C12, C14, C26
CAP., X7R, 0.01µF, 10%, 50V, 0603
AVX, 06035C103KAT2A
2
C21, C22
CAP., X5R, 1000pF, 25, 10%, 0603
AVX, 06035C102JAT2A
10
2
C15, C16
CAP., X7R, 100pF, 5%, 50V, 0603
AVX, 06035C101KAT2A
11
4
C18, C19, C27, C28
CAP., X5R, 10µF, 35V, 1210
TAIYO YUDEN, GMK325BJ106KN
12
1
C48
CAP., X5R, 10µF, 6.3V, 0603
TDK, C1608X5R0J106M
13
2
D1,D2
DIODE, SCHOTTKY, SOD-323
CENTRAL, CMDSH-3TR
14
2
Q1, Q3
OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8
INFINEON, BSC050N03LS
15
2
Q2, Q4
OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8
INFINEON, BSC011N03LSI
16
2
Q5, Q6
TRANS GP, SS, PNP, 40V, SOT-23
ON SEMI, MMBT3906LT1G
17
1
Q11
MOSFET P-CH, 20V, 0.58A, SOT-23
VISHAY, TP0101K-T1-E3
18
12 R5, R17, R27, R39, R40-R42, R44, R45,
R57, R62, R64
RES., CHIP, 10k, 5%, 0603
VISHAY, CRCW060310K0JNEA
19
1
R66
RES., CHIP, 24.3k, 1%, 0603
VISHAY, CRCW060324K3FKEA
20
4
R8, R25, R56, R59, R6, R29, R30, R34
RES., CHIP, 0, 0603
YAGEO, RC0603FR-070RL
21
1
R3
RES., CHIP, 4.87k, 1%, 0603
AAC, CR16-4871FM
22
1
R24
RES., CHIP, 15.8k, 1%, 0603
VISHAY, CRCW060315K8FKEA
23
1
R52
RES., CHIP, 2, 1%, 0603
YAGEO, RC0603FR-072RL
24
1
R63
RES., CHIP, 10, 5%, 0603
YAGEO, RC0603FR-0710RL
25
2
R10, R16
RES., 0.002, 2512, 1%
PANASONIC, ERJ-M1WTF2M0U
26
4
R11, R12, R13, R14
RES., CHIP, 100, 1%, 0603
VISHAY, CRCW0603100RFKEA
27
2
L1, L2
INDUCTOR, 0.4µH
VITEC, 59PR9875
28
1
U4
IC, LTC3880EUJ, QFN 6mm × 6mm
LINEAR TECHNOLOGY, LTC3880EUJ#010J-1PBF
dc1753af
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DEMO MANUAL DC1753A
Parts List
DC1753A-A
ITEM QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1
1
C31
CAP., X7R, 0.1µF, 50V, 10%, 0603
AVX, 06035C104KAT2A
2
1
C49
CAP., X5R, 4.7µF, 10V, 0603
AVX, 0603ZD475KAT2A
3
0
C42-C45
CAP., POSCAP, 330µF, 6.3V, D3L
4
0
C4, C38
CAP., 0603
5
0
C32, C34
CAP., 1210
6
1
C35
CAP., X5R, 10µF, 35V, 1206
TAIYO YUDEN, GMK316BJ106ML
7
1
C36
CAP., TANT., LOW ESR, 3.3µF, 25V, 10%,
AVX, TPSB335K025R2000
8
2
C37, C40
CAP., X7R, 1µF, 50V, 1206
AVX, 12065C105KAT2A
9
1
C41
CAP., X7R, 0.22µF, 16V, 0805
AVX, 0805YC224KAT2A
10
1
D3
LED GREEN S-GW TYPE SMD
PANASONIC, LN1371SGTRP
11
1
D5
LED RED, S-TYPE, GULL WING SMD
PANASONIC, LN1271RTR
12
1
Q15
MOSFET, SPEED, SRS, 30V, 30A, LFPAK
RENESAS, RJK0305DPB-00#J0
13
0
Q7, Q8, Q9, Q10
OPTIMOS3, POWER-TRANSISTOR, PG-TDSON-8
14
1
Q14
MOSFET P-CH, 20V, 0.58A, SOT-23
VISHAY, TP0101K-T1-E3
15
1
Q12
MOSFET N-CH, 60V, 115mA, SOT-23
FAIRCHILD, 2N7002A
16
1
R62
RES., CHIP, 10k, 5%, 0603
VISHAY, CRCW060310K0JNEA
17
5
R48, R51, R77, R79, R80
RES., CHIP, 0, 0603
YAGEO, RC0603FR-070RL
18
0
R18, R20, R22, R23, R32, R58, R60,
R73, R31, R33, R70, R1, R2, R7, R15
RES., CHIP, 0603
19
3
R35, R36, R37
RES., CHIP, 4.99k, 1%, 0603
YEGEO, RC0603FR-074K99L
20
2
R50, R61
RES., CHIP, 100k, 1%, 0603
VISHAY, CRCW0603100KFKEA
21
1
R53
RES., CHIP, 200, 1%, 0603
YAGEO, RC0603FR-07200RL
22
1
R55
RES., CHIP, 127, 1%, 0603
VISHAY, CRCW0603127RFKEA
23
0
R65
RES., CHIP, 30, 1%, 1W, 2512
24
1
R68
RES., CHIP, 0.01, 1%, 2010
25
0
R60
RES., 0805
26
3
R77, R79, R80
RES., CHIP, 0, 0805
27
1
R38
RES., CHIP, 49.9, 1%, 0603
28
1
U5
IC, 24LC025-I/ST, SOIC
MICROCHIP, 24LC025-I/ST
29
1
U6
IC, LT1129CS8-3.3, S8 PACKAGE
LINEAR TECHNOLOGY, LT1129CS8-3.3
30
1
U7
IC, LT1129CS8-5, S8 PACKAGE
LINEAR TECHNOLOGY, LT1129CS8-5
VISHAY, WSL2010R0100FEA
Hardware: For Demo Board Only
1
4
JP1,JP3-JP5
0.100", SINGLE ROW HEADER, 3 PIN
SAMTEC, TSW-103-07-L-S
2
4
JP1,JP3-JP5
SHUNT, 0.100", BLK
SAMTEC, SNT-100-B-G
3
1
SW1
CONNECTOR, SUB MINIATURE SLIDE SWITCHES
C&K, JS202011CQN
4
2
J1, J2
JACK, BANANA
KEYSTONE, 575-4
5
4
J3, J4 (×2)
STUD, TEST PIN
PEM, KFH-032-10
6
4
J3, J4 (×2)
NUT, BRASS 10-32
ANY, #10-32
7
1
J7
CONN., SOCKET, 20 DUAL ROW, RA
MILL MAX, 803-93-020-20-001
8
1
J8
PIN HEADER, 20 DUAL ROW, RA
MILL MAX, 802-40-020-20-0001
9
0
J9 (OPT)
HEADER, 14 POS, 2mm, VERT GOLD
MOLEX, 87831-1420
10
1
J10
CONN., HEADER, 12 POS, 2mm, STR, DL, PCB
FCI, 98414-G06-12ULF
11
1
J11
CONN., BNC, 5 PINS
CONNEX, 112404
dc1753af
10
DEMO MANUAL DC1753A
Parts List
ITEM
QTY
DC1753A-B
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., X7R, 0.1µF, 50V, 10%, 0603
AVX, 06035C104KAT2A
Required Circuit Components
1
3
C1, C2, C6
2
1
C17
CAP., X7R, 0.22µF, 25V, 10%, 0603
TDK, C1608X7R1E224K
3
2
C3, C9
CAP., X7R, 1µF, 16V, 10%, 0603
AVX, 0603YC105KAT2A
4
2
C4, C38
CAP., X5R, 1µF, 25V, 10%, 0603
AVX, 06033D105KAT2A
5
1
C5
CAP., X5R, 4.7µF, 25V, 0805
TAIYO YUDEN, TMK212BJ475KG-T
6
1
C8
CAP., X7R, 4700pF, 10%, 50V, 0603
AVX, 06035C472KAT2A
7
4
C10, C29, C11, C30
CAP., POSCAP, 330µF, 6.3V, D3L
SANYO, 6TPF330M9L
8
1
C13
CAP., OS-CON, 150µF, 35V
SUNCON, 35HVP150M
9
4
C20, C23-C25
CAP., X5R, 100µF, 6.3V, 1210
AVX, 12106D107MAT2A
10
3
C12, C14, C26
CAP., X7R, 0.01µF, 10%, 50V, 0603
AVX, 06035C103KAT2A
11
2
C21, C22
CAP., X5R, 0.22µF, 25, 10%, 0603
AVX, 06033D224KAT2A
12
2
C15, C16
CAP., X7R, 100pF, 5%, 50V, 0603
AVX, 06035C101KAT2A
13
4
C18, C19, C27, C28
CAP., X5R, 10µF, 35V, 1210
TAIYO YUDEN, GMK325BJ106KN
14
1
C48
CAP., X5R, 10µF, 6.3V, 0603
TDK, C1608X5R0J106M
15
2
D1,D2
DIODE, SCHOTTKY, SOD-323
CENTRAL, CMDSH-3TR
16
2
Q1, Q3
OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8
INFINEON, BSC050N03LS
17
2
Q2, Q4
OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8
INFINEON, BSC011N03LSI
18
2
Q5, Q6
TRANS, GP, SS, PNP, 40V, SOT-23
ON SEMI, MMBT3906LT1G
19
1
Q11
MOSFET P-CH, 20V, 0.58A, SOT-23
VISHAY, TP0101K-T1-E3
20
12
R5, R17, R27, R39,
R40-R42, R44, R45, R57,
R62, R64
RES., CHIP 10k, 5%, 0603
VISHAY, CRCW060310K0JNEA
21
8
R8, R25, R56, R59, R7,
R11, R13, R15
RES., CHIP, 0, 0603
YAGEO, RC0603FR-070RL
22
1
R3
RES., CHIP, 4.87k, 1%, 0603
AAC, CR16-4871FM
1
R66
RES., CHIP, 24.3k, 1%, 0603
VISHAY, CRCW060324K3FKEA
23
1
R24
RES., CHIP, 15.8k, 1%, 0603
VISHAY, CRCW060315K8FKEA
24
4
R1, R2, R12, R14
RES., X5R, 1.4k, 1%, 0603
VISHAY, CRCW06031K40FKEA
25
1
R52
RES., CHIP, 2, 1%, 0603
YAGEO, RC0603FR-072RL
26
1
R63
RES., CHIP, 10, 5%, 0603
YAGEO, RC0603FR-0710RL
27
2
R10, R16
RES., CHIP, 0, 1W, 2512
TEPRO, RN5326
28
2
L1, L2
INDUCTOR, 0.56µH
VISHAY, IHLP-4040-DZ-01
29
1
U4
IC, LTC3880EUJ, QFN 6mm × 6mm
LINEAR TECHNOLOGY, LTC3880EUJ#010H-1PBF
Additional Demo Board Circuit Components
1
1
C31
CAP., X7R, 0.1µF, 50V, 10%, 0603
AVX, 06035C104KAT2A
2
1
C49
CAP., X5R, 4.7µF, 10V, 0603
AVX, 0603ZD475KAT2A
3
0
C42-C45
CAP., POSCAP, 330µF, 6.3V, D3L
4
0
C32, C34
CAP., 1210
5
1
C35
CAP., X5R, 10µF, 35V, 1206
6
1
C36
CAP., TANT., LOW ESR, 3.3µF, 25V, 10%,
AVX, TPSB335K025R2000
7
2
C37, C40
CAP., X7R, 1µF, 50V, 1206
AVX, 12065C105KAT2A
TAIYO YUDEN, GMK316BJ106ML
dc1753af
11
DEMO MANUAL DC1753A
Parts List
ITEM
QTY
DC1753A-B
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
8
1
C41
CAP., X7R, 0.22µF, 16V, 0805
AVX, 0805YC224KAT2A
9
1
D3
LED GREEN, S-GW TYPE SMD
PANASONIC, LN1371SGTRP
10
1
D5
LED RED, S-TYPE GULL WING SMD
PANASONIC, LN1271RTR
RENESAS, RJK0305DPB-00#J0
11
1
Q15
MOSFET, SPEED, SRS, 30V, 30A, LFPAK
12
0
Q7, Q8, Q9, Q10
OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8
13
1
Q14
MOSFET P-CH, 20V, 0.58A, SOT-23
VISHAY, TP0101K-T1-E3
14
1
Q12
MOSFET N-CH, 60V, 115mA, SOT-23
FAIRCHILD, 2N7002A
15
1
R62
RES., CHIP, 10k, 5%, 0603
VISHAY, CRCW060310K0JNEA
YAGEO, RC0603FR-070RL
16
5
R48, R51, R77, R79, R80
RES., CHIP, 0, 0603
17
0
R18, R20, R22, R23, R32,
R58, R60, R73, R31, R33,
R70, R6, R29, R30, R34
RES., CHIP, 0603
18
3
R35, R36, R37
RES., CHIP, 4.99k, 1%, 0603
YEGEO, RC0603FR-074K99L
19
2
R50, R61
RES., CHIP, 100k, 1%, 0603
VISHAY, CRCW0603100KFKEA
20
1
R53
RES., CHIP, 200, 1%, 0603
YAGEO, RC0603FR-07200RL
VISHAY, CRCW0603127RFKEA
21
1
R55
RES., CHIP, 127, 1%, 0603
22
0
R65
RES., CHIP, 30, 1%, 1W, 2512
23
1
R68
RES., CHIP, 0.01, 1%, 2010
24
0
R60
RES., 0805
25
3
R77, R79, R80
RES., CHIP, 0, 0805
VISHAY, WSL2010R0100FEA
26
1
R38
RES., CHIP, 49.9, 1%, 0603
27
1
U5
IC, 24LC025-I/ST, SOIC
MICROCHIP, 24LC025-I/ST
28
1
U6
IC, LT1129CS8-3.3, S8 PACKAGE
LINEAR TECHNOLOGY, LT1129CS8-3.3
29
1
U7
IC, LT1129CS8-5, S8 PACKAGE
LINEAR TECHNOLOGY, LT1129CS8-5
0.100", SINGLE ROW HEADER, 3 PIN
SAMTEC, TSW-103-07-L-S
Hardware: For Demo Board Only
1
4
JP1,JP3-JP5
2
4
JP1,JP3-JP5
SHUNT, 0.100" BLK
SAMTEC, SNT-100-B-G
3
1
SW1
CONNECTOR, SUB MINIATURE SLIDE SWITCHES
C&K, JS202011CQN
4
2
J1, J2
JACK, BANANA
KEYSTONE, 575-4
5
4
J3, J4 (×2)
STUD, TEST PIN
PEM, KFH-032-10
6
4
J3, J4 (×2)
NUT, BRASS, 10-32
ANY, #10-32
7
1
J7
CONN., SOCKET, 20 DUAL ROW RA
MILL MAX, 803-93-020-20-001
8
1
J8
PIN HEADER, 20 DUAL ROW RA
MILL MAX, 802-40-020-20-0001
9
0
J9 (OPT)
HEADER, 14 POS, 2mm, VERT GOLD
MOLEX, 87831-1420
10
1
J10
CONN., HEADER, 12 POS, 2mm, STR DL PCB
FCI, 98414-G06-12ULF
11
1
J11
CONN., BNC, 5 PINS
CONNEX, 112404
dc1753af
12
A
B
C
D
VIN
E9
E3
J2
J1
JP1
WP
ON
Q5
MMBT3906LT
C15
100pF
ITH
GND
GND
VIN
6.5V - 24V
E2
SGND
OFF
E11
SYNC
SDA
ITH
C12
10nF
R42
10K
R23
OPT
R24
15.8K
R22
OPT
R32
OPT
R20
OPT
R73
OPT
21
20
19
U4
VTRIM1_CFG
VTRIM0_CFG
VOUT1_CFG
VOUT0_CFG
FREQ_CFG
SC
WP
ASEL
RUN0
RUN1
TSNS0
TSNS1
ITH0
ITH1
E6
TG0
38
ISNS0+
ISNS0-
6
7
ISNS1+
ISNS1-
3
4
12
13
4
*
C22
4
4
Q1
*
*
L2
*
L1
*
*
R7
C27 10uF
0
OPT
*
R6
*
R10
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
0
2
SCALE = NONE
YI S.
HZ
APPROVALS
OPT
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
*
*
2512
R16
R29
C18 10uF
*
R15
C28 10uF
C19 10uF
2
*
1
REV
2512
*
R30
C32 C24
OPT 100uF
1210
C34 C25 C23
100uF 100uF
R34 OPT
1210 1210 1210
__
ECO
+
1.4K
C30
330uF
D3L
D3L
OPT
+ C43
+
1
C45
D3L
OPT
D3L
OPT
+ C42
VOUT
+
DATE:
N/A
LTC3880EUJ
DEMO CIRCUIT 1753A
Monday, May 07, 2012
IC NO.
J3
GND
GND_SNS
R25
0
E8
J4
VOUT_SNS
1
SHEET 1
DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC
CONVERTER WITH DIGITAL POWER MANAGEMENT
SIZE
DATE
3-28-12
D
1
OF 3
REV.
A
B
C
VOUT
R8 ADJ., MAX 40A
0
E7
C44
D3L
OPT
YI S.
APPROVED
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
0.56uH
TECHNOLOGY
0.22uF 1.0 uF
TITLE: SCHEMATIC
0
+
330uF
D3L
+ C29
C11
C20
100uF 330uF
1210 D3L
330uF
D3L
+ C10
PRODUCTION
DESCRIPTION
REVISION HISTORY
CURRENT SENSE CONNECTIONS
R7,R15 R6,R29 R30,R34 R10,R16 R11,R13 R12,R14 C21,C22 C4,C38 L1,L2
OPT
1nF
OPEN 0.4uH
0
0.002
100
0
100
*
R1
Q7
OPT
R2
Q8
OPT
CUSTOMER NOTICE
OPT
R1,R2
*
R11
1.4K
FSW
*
C4
*
R12
4
4
VIN
350KHz
R SENSE
*
C21
*
C38
*
R14
OPT
Q9
R13
VIN
Q10
OPT
-B VERSION DCR SENSE 425KHz
-A VERSION
ASSY
4
4
EXTVCC_DRV
VSENSE0+
Q2
BSC011N03LSI
4
C1 100nF
VDD33
*
R56 0
100nF
BSC011N03LSI
Q4
4
C2
BSC050N03LS
Q3
D1
CMDSH-3TR
R60 OPT
3
Figure 9. Demo Circuit 1753A Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
GPIO0B
R44 10K
BOOST0
VSENSE0-
R59 0
R45 10K
GPIO1B
BG1
32
27
SW1
29
31
30
2
TG1
BG0
36
1
SW0
TG0
39
37
SGND AND PGND CONNECTED AT
A SINGLE NODE NEAR U1
GPIO0
GPIO1
VSENSE1
ISNS1-
ISNS1+
BG1
SW1
BOOST1
TG1
VSENSE0-
VSENSE0+
ISNS0-
ISNS0+
BG0
SW0
BOOST0
C48
10uF
C6
D2
100nF CMDSH-3TR
E10
INTVCC/EXTVCC
INTVCC
VDD33
C5
4.7uF
0805
C9 C3
1uF 1uF
ALERT LTC3880EUJ
SYNC
SDA
SCL
E5
NOTE: UNLESS OTHERWISE SPECIFIED
R18
OPT
17
24
23
16
14
15
40
28
5
26
11
8
VOUT_CFG18
FREQ_CFG
SC
WP
RUN
ASEL
C14
10nF
R17
10K
VDD25
5
R5
10K
TSNS0
9
10
VDD33
C17
0.22uF
R41 R57 R40 R39
10K 10K 10K 10K
R52 2
PLACE Q5,Q6 NEAR L1,L2. RESPECTIVELY
ALERTB
Q6
MMBT3906LT
VDD33
2
TSNS1
R3
4.87K
SCL
C13
150uF
35V
C8
4.7nF
R48 0
C16
100pF
ITH_TP
+
VIN
E4
4
2
1
VDD25 GND
2
VDD33
5
1
BOOST1
5
1
2
3
5
5
E1
3
1
VDD25
GND
41
VTRIM_CFG
35
VIN
33
INTVCC
25
VDD33
22
VDD25
PGND
34
BSC050N03LS
5
5
1
2
3
5
51
2
3
1
2
3
1
2
3
1
2
3
5
1
2
3
1
2
3
GND
DEMO MANUAL DC1753A
Schematic Diagram
dc1753af
13
A
B
C
D
1
2
3
4
5
6
7
8
9
10
11
12
GND
4
3
2
1
E21
WP
SCL
A1
A2
5
6
7
8
5
EESDA
EESCL
EEWP
AUXVCC
C31 100nF
R70
OPT
R35
4.99K
E12
AUXP
R36
4.99K
4
OPT
R33
R37
4.99K
OPT
R31
ALERTB
E13
ALERTB
SCL
1
+3.3V 2
VIN_SNS 3
GND 4
VIN_EN 5
SCL 6
ALERTB 7
SDA 8
CONTROL0 9
SPARE1 10
SPARE2 11
WDI/RESETB 12
CONTROL1 13
SPARE3 14
SHARE_CLK 15
FAULT4 16
FAULT2 17
FAULT3 18
FAULT1 19
SPARE4 20
GND
J8 DEMO HEADER (M)
SDA
E14
SDA
E15
SCL
3V3
SC
SYNC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3
2
SCALE = NONE
YI S.
HZ
APPROVALS
+3.3V
VIN_SNS
GND
VIN_EN
SCL
ALERTB
SDA
CONTROL0
SPARE1
SPARE2
WDI/RESETB
CONTROL1
SPARE3
SHARE_CLK
FAULT4
FAULT2
FAULT3
FAULT1
SPARE4
GND
J7 DEMO HEADER (F)
R80 0
R79 0
R77 0
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
R58
OPT
E17
SYNC
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
SHARE_CLK
FAULT4
FAULT2
FAULT3
FAULT1
SYNC_C
E16
R51
0
SC
2
1
OFF
ON
5
SW1
RUN
C
NC
GPIO0-GPIO1
JP5
3
2
E22
E20
E19
SGND
RUN
GPIO0B
GPIO1B
DATE:
N/A
SIZE
LTC3880EUJ
DEMO CIRCUIT 1753A
Monday, May 07, 2012
IC NO.
1
SHEET 2
1
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
RUN
GPIO0B
E25
DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC
CONVERTER WITH DIGITAL POWER MANAGEMENT
TITLE: SCHEMATIC
C26
10nF
R63
10
TECHNOLOGY
2
R27
10K
VDD33
1
GPIO1B
Figure 10. Demo Circuit 1753A Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management
24LC025-I/ST
VSS SDA
VCC
A0
U5
TO DC1613A
AUXP
SDA
GND
SCL
LGKPWR
ALERTB
GPIO_1
OUTEN_0
OUTEN_1
GND
AUXSCL
AUXSDA
J10
TO DC1427A
(OPT)
J9
V+ 1
3.3V or 5V2
GND 34
SCK/SCL5
MISO 6
CS
MOSI/SDA7
GND 8
EESDA 9
EEVCC10
EESCL11
EEGND 12
GND 13
GPIO_1 14
3V3
3
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
4
4
1
14
6
3
5
A
B
C
D
DEMO MANUAL DC1753A
Schematic Diagram
dc1753af
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
5
GND
VIN
ON
OFF
JP3
LED
R50
1.5K
3.3uF
3528
+ C36
2
R62
10K
4
VIN
3V3
C37
1uF
1206
8
7
6
5
R68
0.01
GND
NC
R66 10K
3
2
R64
10K
Q11
TP0101K
VIN
OUTPUT
LT1129CS8-3.3
4
VDD33
1
2
3
4
IOUT
TST
NOTE:
PULSE OUT
10mV / AMP
GND SENSE/ADJ
GND
U6
SHDN
R38 49.9 1
C41
0.22uF
0805
E27
3
J11
C35
10uF
1206
+3.3V
VOUT
R65
30
1W
2512
OPT
VOUT
OFF
ON
R61
1.5K
C40
1uF
1206
8
7
6
5
GND
VIN
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
2
3
4
2
2
SCALE = NONE
YI S.
HZ
APPROVALS
OUTPUT
LT1129CS8-5
GND SENSE/ADJ
NC
GND
U7
SHDN
Q12
2N7002A
CUSTOMER NOTICE
1
ALERTB
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
2
JP4
EXTVCC_DRV
VIN
GPIO0B
D3
GREEN
GPIO0B
R53
200
+3.3V
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
4
1
TP0101K
Q14
DATE:
N/A
SIZE
LTC3880EUJ
DEMO CIRCUIT 1753A
Monday, May 07, 2012
IC NO.
1
SHEET 3
1
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
1
DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC
CONVERTER WITH DIGITAL POWER MANAGEMENT
TITLE: SCHEMATIC
TECHNOLOGY
EXTVCC_DRV
C49
4.7uF
R55
127
D5
ALERTB
RED
+3.3V
Figure 11. Demo Circuit 1753A Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management
E24
DO NOT EXCEED 5% DUTY CYCLE!
PULSE IN
E23
Q15
RJK0305DPB
VOUT
5
1
2
3
DYNAMIC LOAD CIRCUIT
3
1
2
3
4
5
D
1
3
1
1
2
3
2
2
3
1
2
5
A
B
C
D
DEMO MANUAL DC1753A
Schematic Diagram
dc1753af
15
DEMO MANUAL DC1753A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1753af
16 Linear Technology Corporation
LT 0912 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
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