1
dc2088af
DEMO MANUAL DC2088A
Description
High Density LTC3880
Step-Down DC/DC Converter with
Power System Management
Demonstration circuit 2088A is a high current, high den-
sity, two-phase single output synchronous buck converter
featuring the LTC3880EUJ, a dual-phase current mode
controller. The LT C
®
3880 has the PMBus interface and
power system management functions.
The layout of DC2088A is very compact and the total so-
lution is within a 1.0" × 1.0" area. The DrMOS is used on
the board for high current, high efficiency. The input range
of this board is from 7V to 14V, and the output voltage
can be programmed from 0.8V to 1.8V, with an output
current up to 50A. The factory default setting for the output
is 1.0V. The DC2088A also has an on-board dynamic load
circuit, which makes it easy for the customer to evaluate
the transient performances.
The DC2088A powers up to default settings and produces
power based on configuration resistors or NVM without
the need for any serial bus communication. This allows
easy evaluation of the DC/DC converter aspects of the
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
LTC3880. To fully explore the extensive power system
management features of the parts, download the GUI
software LTpowerPlay onto your PC and use LT C ’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.
GUI DOWNLOAD
The software can be downloaded from:
www.linear.com/ltpowerplay
For more details and instructions on LTpowerPlay, please
refer to “LTpowerPlay for LTC3880 Quick Start Guide”.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at TA = 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 7 12 14 V
VOUT Output Voltage Range IOUT = 0A TO 50A, VIN = 7.0V to 14V 0.8 1.0 1.8 V
IOUT Output Current Range 0 50 A
fSW Factory Default Switching 425 kHz
EFF Peak Efficiency VOUT = 1.0V, See Figures 4. 87.8 %
2
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
Demonstration circuit 2088A makes it easy to set up to
evaluate the performances of the LTC3880. Refer to Figure 2
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 C14. See Figure 3
for proper scope probe technique.
1. Make sure jumpers are in the following positions:
JUMPER POSITION FUNCTION
JP1 ON Drives ON
JP2 OFF LED
2. With power off, connect the input power supply to VIN
and GND. Connect active load to the output.
3. Make sure RUN switch (SW) is OFF.
4. Turn on the power at the input.
NOTE. Make sure that the input voltage does not exceed 16V.
5. Turn on RUN switch as desired.
6. Check for the correct output voltage from E4 to E6.
VOUT = 1.0V ± 0.5% (1.005V ~ 0.995V)
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 voltage is 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 “LTpowerPlay QUICK START” session for
details.
3
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
Figure 1. Demo Setup with PC
Figure 2. Power Test Setup
CONNECTING A PC TO DC2088A
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, sequenc-
ing parameters, the fault log, fault responses, GPIO and
other functionality. The DC1613A dongle may be plugged
in regardless of whether or not VIN is present. The Dongle
can be hot plugged.
USB TO 12C/PMBus DONGLE
DC1613A
DEMO BOARD
DC2088A LOAD
+12V
POWER SUPPLY
USB CABLE
12-PIN
CONNECTOR
dc2088a F01
VOUT
VIN
+
–
+
–
+–
LOAD
SHUNT
POWER
SUPPLY
RUN
SWITCH
dc2088a F02
DC1613A
CONNECTOR
VIN
IIN
VOUT +
–
+ –
4
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
MEASURING EFFICIENCY (SEE FIGURE 2)
• To accurately measure efficiency of any configuration,
do the following:
• Set JP1, JP2 to OFF position to disable all the auxiliary
circuits.
• Make sure R4, R10 not stuffed.
• Provide an external 5V for the gate drive, and connect
it to E15 and E16.
• Measure VIN across the input ceramic capacitor (C29).
Measure VOUT across the output ceramic capacitor
(C14). Add the driver loss (VDR•IDR) to the total ef-
ficiency calculation.
EVALUATING THE LTC3880-1
For applications that require the highest possible efficiency,
the LTC3880-1 allows the user to supply the bias voltage
and gate driver current from an external power supply.
Please install R4 (0Ω). Then, the 5V gate drive for the
DrMOS will also provide power to the EXTVCC.
To accurately measure efficiency of a demo board contain-
ing the LTC3880-1,
• Set JP1, JP2 to OFF to disable the LDO.
• Connect an external 5V power supply to E15, E16.
• Measure VIN across the input ceramic capacitor (C29).
Measure VOUT across the output ceramic capacitor
(C14).
MEASURING OUTPUT RIPPLE VOLTAGE
An accurate ripple measurement may be performed by
using the below configuration across C16.
+ –
VOUT GND
COUT
Figure 3. Measuring Output Voltage Ripple
5
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
Figure 4. Typical Efficiency Curves DC2088A, 12VIN, fSW = 425kHz, VOUT = 1.2V, 1.0V, 0.9V
80
81
82
83
84
85
86
87
88
89
90
EFFICIENCY (%)
0 10 20 30 40 50 60
LOAD CURRENT (A)
12VIN 1.0VOUT 425kHz
12VIN 0.9VOUT 425kHz
12VIN 1.2VOUT 425kHz
dc2088a F04
LTpowerPlay Software GUI
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology power sys-
tem management ICs, including the LTC3880, LTC3883,
LTC2974 and LTC2978. 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 LTC3880’s
DC2088A demo system, or a customer board. The soft-
ware 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: www.linear.com/ltpowerplay
To access technical support documents for LT C Digital
Power Products visit Help. View online help on the
LTpowerPlay menu.
6
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
LTpowerPlay QUICK START PROCEDURE
The following procedure describes how to use LTpow-
erPlay to monitor and change the settings of LTC3880.
1. Download and install the LTPowerPlay GUI:
http://linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the
DC2088A. The system tree on the left hand side
should look like this:
Figure 3. Measuring Output Voltage Ripple
7
dc2088af
DEMO MANUAL DC2088A
Quick start proceDure
b. A green message box shows for a few seconds
in the lower left hand corner, confirming that the
LTC3880 and the LTC3883 are communicating:
c. In the Toolbar, click the “R” (RAM to PC) icon to
read the RAM from the LTC3880 and the LTC3883.
This reads the configuration from the RAM of
LTC3883 and loads it into the GUI.
d. If you want to change the output voltage to a
different value, like 1.5V. In the Config tab, type in
1.5 in the VOUT_COMMAND box, like this:
Then, click the “W” (PC to RAM) icon to write these register
values to the LTC3880 and the LTC3883. After finishing this
step, you will see the output voltage will change to 1.5V.
If the write is successful, you will see the following message:
e. You can save the changes into the NVM. In the tool
bar, click “RAM to NVM” button, as following
f. Save the demo board configuration to a (*.proj)
file. Click the Save icon and save the file. Name it
whatever you want.
8
dc2088af
DEMO MANUAL DC2088A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 4 C1, C2, C28, C29 CAP., X5R, 22µF, 25V, 10%,1210 AVX, 12103D226KAT
2 2 C5, C30 CAP., X5R, 1µF, 10V, 20%, 0603 AVX, 0603ZD105MAT2A
3 6 C4, C10, C11, C16, C27, C36 CAP., X5R, 1µF, 10V, 20%, 0402 AVX, 0402ZD105MAT2A
4 1 C6 CAP., X5R, 10µF, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC
5 3 C3, C9, C26 CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT
6 2 C7, C8 CAP., OS-CON, 330µF, 16V, 20% SANYO, 16SVP330M
7 20 C12-C15, C17, C31-C35, C43-C52 CAP., X5R, 100µF, 6.3V, 20%,1206 TAYO YUDEN, JMK316BJ107ML-T
8 2 C18, C19 CAP., POSCAP, 470µF, 2.5V, D2E SANYO 2R5TPE470M9
9 2 C22, C37 CAP., X5R, 0.22µF, 16V, 20%, 0402 TDK, C1005X5R1C224M
10 1 C23 CAP., X7R, 1nF, 25V, 10%, 0402 AVX, 04023C102KAT2A
11 1 C24 CAP., NPO, 100pF,25V, 10%, 0402 AVX,04023A101KAT2A
12 1 C25 CAP., X5R, 10nF, 25V, 10%, 0402 AVX, 04023D103KAT2A
13 2 L1, L2 INDUCTOR, SMT POWER IND. 0.16µH COILCRAFT., XAL7070-161ME
14 1 Q1 TRANS GP SS PNP 40V SOT-23 ON SEMI MMBT3906LT1G
15 1 Q3 MOSFET P-CH 20V, 0.58A, SOT-23 VISHAY, TP0101K-T1-E3
16 6 R2, R11, R12, R16, R17, R30 RES., CHIP, 0, 1%, 0402 VISHAY, CRCW04020000Z0ED
17 4 R1, R13, R36, R66 RES., CHIP, 0, 1%, 0603 VISHAY, CRCW06030000Z0EA
18 2 R3, R15 RES., CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA
19 2 R7, R19 RES., CHIP, 10k, 1%, 0402 VISHAY, CRCW040210K0FKED
20 5 R18, R20, R22, R24, R39 RES., CHIP, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA
21 1 R6 RES., CHIP, 1, 1%, 0402 VISHAY, CRCW04021R00FKED
22 4 R8, R9, R25, R27 RES., CHIP, 825, 1%, 0402 VISHAY, CRCW0402825RJNED
23 1 R14 RES., CHIP, 6.81k, 1%, 0402 VISHAY, CRCW04026K81FKED
24 1 R23 RES., CHIP, 20k, 1%, 0402 VISHAY,CRCW040220K0FKED
25 1 R28 RES., CHIP, 17.8k, 1%, 0402 VISHAY,CRCW040217K8FKED
26 1 R31 RES., CHIP, 16.2k, 1%, 0603 VISHAY, CRCW060316K2FKEA
27 1 R33 RES., CHIP, 24.9k, 1%, 0603 VISHAY, CRCW060324K9FKEA
28 1 R34 RES., CHIP, 4.32k, 1%, 0603 VISHAY, CRCW06034K32FKEA
29 1 R40 RES., CHIP, 15.8k, 1%, 0603 VISHAY, CRCW060315K8FKEA
30 2 U1, U3 IC, HIGH FREQUENCY DrMOS MOUDLE FAIRCHILD, FDMF6823A
31 1 U2 IC, LTC3880EUJ, QFN 6mm × 6mm LT C ., LTC3880EUJ#PBF
Additional Circuit Components
1 2 CBYP1, CBYP2 CAP., X7R, 0.01µF,16V, 10%, 0603 AVX, 0603YC103KAT
2 2 COUT1, COUT2 CAP., X5R, 10µF,25V, 20%,1206 TDK, C3216X7R1E106M
3 1 C40 CAP., X7R, 1µF, 16V, 10%, 1206 AVX, 1206YC105KAT
4 1 C41 CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT
5 1 C39 CAP., X5R, 1µF, 16V, 20%, 0805 AVX, 0805YD105MAT
6 0 C20, C21, C53, C54 CAP., POSCAP, 470µF, 2.5V, D2E SANYO 2R5TPE470M9
7 1 C38 CAP., X5R, 2.2µF, 16V, 10%, 0805 AVX, 0805YD225KAT
8 1 C42 CAP., X5R, 10nF, 25V, 10%, 0603 AVX, 06033D103KAT
9 1 C55 CAP., X7R, 0.1µF,16V, 10%, 0603 AVX, 0603YC104KAT
9
dc2088af
DEMO MANUAL DC2088A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
10 1 D1 LED GREEN S-GW TYPE SMD ROHM, SML-010FTT86L
11 1 D2 LED RED S-TYPE GULL WING SMD ROHM, SML-010VTT86L
12 1 D3 DIODE, SCHOTTKY, SOD-323 CENTRAL CMDSH-3TR
13 1 Q2 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0
14 1 Q3 MOSFET P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3
15 1 Q5 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD, 2N7002A-7-F
16 7 R54-R60 RES., CHIP, 0, 1%, 0603 VISHAY, CRCW06030000Z0EA
17 1 R51 RES., CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA
18 2 R38, R48 RES., CHIP, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA
19 2 R43, R44, RES., CHIP, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA
20 1 R10 RES., CHIP, 30, 1%, 2512 VISHAY, CRCW251230R0FKEA
21 0 R21, R62, R63 (OPT) RES., 0402
22 0 R4, R5, R26, R29, R32, R35 (OPT) RES., 0603
23 0 R47 (OPT) RES., 0805
24 1 R37 RES., CHIP, 200, 1%, 0603 VISHAY, CRCW0603200RFKEA
25 1 R41 RESISTOR .010Ω 1W, 1% 2512 PANASONIC, ERJ-M1WSF10MU
26 1 R42 RES., CHIP, 127, 1%, 0603 VISHAY, CRCW0603127RFKEA
27 2 R45, R46 RES., CHIP, 4.99k, 1%, 0603 VISHAY, CRCW06034K99FKEA
28 1 R49 RES., CHIP, 6.19k, 1%, 0603 VISHAY, CRCW06036K19FKEA
29 1 R50 RES., CHIP, 3.4k, 1%, 0603 VISHAY, CRCW06033K40FKEA
30 2 R52, R53 RES., CHIP, 2k, 1%, 0603 VISHAY, CRCW06032K00FKEA
31 1 U4 IC, SERIAL EEPROM MICROCHIP 24LC025-I/ST
32 1 U5 IC, LT3029IMSE, MSOP, 16 PIN LT C ., LT3029IMSE#PBF
Hardware
1 8 E1, E2, E4, E6, E11, E12, E15, E16 TESTPOINT, TURRET, .062" MILL-MAX, 2308-2-00-80-00-00-07-0
2 2 J1, J2 JACK, BANANA KEYSTONE 575-4
3 2 J3, J4 STUD, TEST PIN PEM KFH-032-10
4 4 J3, J4(X2) NUT, BRASS 10-32 ANY #10-32
5 2 J3, J4 RING, LUG #10 KEYSTONE, 8205, #10
6 2 J3, J4 WASHER, TIN PLATED BRASS ANY #10
7 2 J5, J7 CONN, BNC, 5-PINS CONNEX, 112404
8 1 J6 CONN HEADER 12POS 2mm STR DL PCB FCI 98414-G06-12ULF
9 1 J8 HEADER., DOUBLE ROW, RIGHT ANGLE
2 × 5 PIN
MILL-MAX 802-40-010-20-001000
10 1 J9 SOCKET, DOUBLE ROW, 2 × 5 PIN MILL-MAX 803-43-010-20-001000
11 2 JP1, JP2 HEADER 3 PIN 0.079 SINGLE ROW SULLIN, NRPN031PAEN-RC
12 2 JP1, JP2 SHUNT SAMTEC, 2SN-BK-G
13 1 SW SWITCH SLIDE 1PDT 6VDC 0.3A SMT C & K JS102011SAQN
14 4 STANDOFF STANDOFF, SNAP ON KEYSTONE_8831
15 1 STENCIL STENCIL
10
dc2088af
DEMO MANUAL DC2088A
5
5
4
4
3
3
2
2
1
1
D D
CC
BB
A A
SGND AND PGND
CONNECTED AT
A SINGLE NODE
NEAR U2
7V-14V
1210
1210
SVP
16V
SVP
1210
16V
1210 1210 1210 1210 1210
1210 1210
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
1210 1210 1210 1210
1210 1210 1210 1210 1210
ADDRESS: 0X4B
SHARE_CLOCK
VDD33
WP
FREQ_CFG
VDD25
INTVCC
VOUT0_CFG
VTRIM_CFG
VOUT_CFG
FREQ_CFG
VTRIM_CFG
VDD33
VDD25
VDD25
VDD33
VDD25
VIN
VDD33
VOUT
VDR
VDR
VDR
INTVCC
VDD33
VOUT
SYNC_A
ALERTB
GPIO1B
VSNSN
RUN
GPIO0B
SHARE_CLOCK
BG0
GPIO0B
SCL
SDA
GPIO1B
SCL
ITH
VIN
VIN
SDA
BG1
WP
VSNSP
ALERTB
GPIO0B
GPIO0B
BG0
BG1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YI S.
PRODUCTION 31-31-21
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YI S.
PRODUCTION 31-31-21
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YI S.
PRODUCTION 31-31-21
__
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
1 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
1 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
1 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
L1
0.16uH
L1
0.16uH
R1 0R1 0
C4
1uF
16V
C4
1uF
16V
C50
100uF
C50
100uF
L2
0.16uH
L2
0.16uH
C9
100nF
C9
100nF
C13
100uF
C13
100uF
C16
1uF
C16
1uF
C45
100uF
C45
100uF
C22 0.22uFC22 0.22uF
C49
100uF
C49
100uF
J2
GND
J2
GND
R62
OPT
R62
OPT
C52
100uF
C52
100uF
R18 10kR18 10k
R15
10
R15
10
C5
1uF
C5
1uF
J1
VIN
J1
VIN
E1
VIN
E1
VIN
C36
1uF
C36
1uF
C46
100uF
C46
100uF
C17
100uF
C17
100uF
C6
10uF
C6
10uF
R13 0R13 0
C43
100uF
C43
100uF
R17
0
R17
0
+
C18
470uF
+
C18
470uF
R28
17.8K
R28
17.8K
E4
VOUT+
E4
VOUT+
+
C19
470uF
+
C19
470uF
+
C21
OPT
+
C21
OPT
R8
825
R8
825
R14
6.81K
R14
6.81K
R24 10kR24 10k
C34
100uF
C34
100uF
C27
1uF
16V
C27
1uF
16V
C10
1uF
C10
1uF
C33
100uF
C33
100uF
R29 OPTR29 OPT
FDMF6823A
U1
FDMF6823A
U1
SMOD# 1
VCIN 2
VDRV3
BOOT4
CGND5
GH 6
PHASE7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29
VSWH
30
VSWH 32
VSWH 33
VSWH 34
VSWH 35
GL 36
CGND 37
NC 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND41
R32 17.4kR32 17.4k
+
C7
330uF
+
C7
330uF
C51
100uF
C51
100uF
C2
22uF
1210
C2
22uF
1210
+
C8
330uF
+
C8
330uF
R10
30
1W
R10
30
1W
R36 0R36 0
R6 1R6 1
C15
100uF
C15
100uF
R35 OPTR35 OPT
R9
825
R9
825
C29
22uF
1210
C29
22uF
1210
R16 0R16 0
C47
100uF
C47
100uF
C28
22uF
1210
C28
22uF
1210
R22 10kR22 10k
C3
100nF
C3
100nF
C30
1uF
C30
1uF
C23
1nF
C23
1nF
J4
GND
J4
GND
R2 0R2 0
R19
10K
R19
10K
R11
0
R11
0
FDMF6823A
U3
FDMF6823A
U3
SMOD# 1
VCIN 2
VDRV3
BOOT4
CGND5
GH 6
PHASE7
NC 8
VIN 9
VIN 10
VIN
11
VIN
12
VIN
13
VIN
14
VSWH
15
PGND
16
PGND
17
PGND
18
PGND
19
PGND
20
PGND
21
PGND
22
VSWH 31
PGND
23
PGND
24
PGND
25
PGND
26
PGND
27
PGND
28
VSWH
29
VSWH
30
VSWH 32
VSWH 33
VSWH 34
VSWH 35
GL 36
CGND 37
NC 38
DISB# 39
PWM 40
VSWH
43
VIN 42
GND41
+
C53
470uF
+
C53
470uF
R30 0R30 0
R12
0
R12
0
+
C20
OPT
+
C20
OPT
R63
OPT
R63
OPT
R4
OPT
R4
OPT
C37 0.22uFC37 0.22uF
C24
100pF
C24
100pF
+
C54
470uF
+
C54
470uF
C44
100uF
C44
100uF
C48
100uF
C48
100uF
R34 4.32kR34 4.32k
R27
825
R27
825
C14
100uF
C14
100uF
R33 24.9kR33 24.9k
J3
VOUT
J3
VOUT
R23
20K
R23
20K
C26
100nF
C26
100nF
R3
10
R3
10
C11
1uF
C11
1uF
C25
10nF
C25
10nF
Q1Q1
R26 OPTR26 OPT
R20 10kR20 10k
C1
22uF
1210
C1
22uF
1210
C32
100uF
C32
100uF
U2
LTC3880EUJ
U2
LTC3880EUJ
VSENSE0+ 1
VSENSE0- 2
ISNS1+ 3
ISNS1- 4
ITH0
5
ISNS0+ 6
ISNS0- 7
SYNC
8
SCL
9
SDA
10
ALERT
11
GPIO0
12
GPIO1
13
RUN0
14
RUN1
15
ASEL
16
FREQ_CFG
17
VOUT0_CFG
18
VOUT1_CFG
19
VTRIM0_CFG
20
VTRIM1_CFG
21
VDD25 22
WP
23
SC
24
VDD33 25
ITH1
26
VSENSE1 27
TSNS1
28
SW1 29
TG1 30
BOOST1 31
BG1 32
INTVCC 33
PGND
34
VIN 35
BG0 36
BOOST0 37
TG0 38
SW0 39
TSNS0
40
GND
41
R5
OPT
R5
OPT
C35
100uF
C35
100uF
R7
10k
R7
10k C12
100uF
C12
100uF
E6
VOUT-
E6
VOUT-
E2
GND
E2
GND
R66
0
R66
0R25
825
R25
825
C31
100uF
C31
100uF
R21
OPT
R21
OPT
R31 16.2kR31 16.2k
schematic Diagram
11
dc2088af
DEMO MANUAL DC2088A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5
5
4
4
3
3
2
2
1
1
DD
CC
B B
AA
ON
OFF
RUN
NOTE:
PULSE OUT
10mV / AMP
TO DC1613A
0805
2512
1206 1206
IOUT
TST
ON
OFF
EXT
DYNAMIC LOAD CIRCUIT
DO NOT EXCEED 5% DUTY CYCLE!
RIGHT
ANGLE
HEADER
RIGHT
ANGLE
SOCKET
0805
ON
OFF
LED
DRIVER
VOUT
GPIO0B
ALERT
EESCL
AUXVCC
EESDA
VDD33
3V3 VDD33
VIN
3V3
VDR
VIN
+5V
VINVIN
+5V
+5V
RUN
ALERTB
SDA
SCL VOUT
GPIO0B
VIN
SCL SDA GPIO0B RUN SHARE_CLK SYNC
VOUT
GPIO0B
ALERTB
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
2 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
2 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY 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 LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, May 20, 2013
2 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
HZ
YI S.
N/A
LTC3880EUJ
DEMO CIRCUIT 2088A
R41
0.01
R41
0.01
R40
15.8K
R40
15.8K
CBYP2
0.01uF
CBYP2
0.01uF
R54 0R54 0
Q4
TP0101K
Q4
TP0101K
23
1
R47
OPT
R47
OPT
E12
GND
E12
GND
R43
100K
R43
100K
Q2
RJK0305DPB
Q2
RJK0305DPB
1
2
5
3
4
D3D3
2 1
R58 0R58 0
R37
200
R37
200
JP2JP2
1
2
3
R46
4.99K
R46
4.99K
D2 RED
D2 RED
E11
PULSE IN
E11
PULSE IN
10uF
COUT1
10uF
COUT1
E16
GND
E16
GND
R55 0R55 0
SWSW
2
13
C39
1uF
C39
1uF
U5
LT3029IMSE
U5
LT3029IMSE
BYP1
1
VIN1 13
BYP2 8
ADJ2 9
GND
5
ADJ1
16
SHDN1
15
VOUT1
4
SHDN2 10
VOUT2 7
VIN2 12
VOUT1
3VOUT2 6
VIN1 14
VIN2 11
NC
2
GND
17
D1 GREEN
D1 GREEN
E15
VDR
E15
VDR
J6J6
AUXP 1
SDA 2
GND 3
SCL 4
LGKPWR 5
ALERTB 6
GPIO_1 7
OUTEN_0 8
OUTEN_1 9
GND 10
AUXSCL 11
AUXSDA 12
R53
2K
R53
2K
Q3
TP0101K
Q3
TP0101K
2
3
1
R38
10K
R38
10K
J5J5
1
2
3
4
5
R56 0R56 0
C41 100nFC41 100nF
C40
1uF
C40
1uF
10uF
COUT2
10uF
COUT2
C42
10nF
C42
10nF
R42
127
R42
127
U4
24LC025-I/ST
U4
24LC025-I/ST
A0
1
A1
2
A2
3
VSS
4SDA 5
SCL 6
WP 7
VCC 8
CBYP1
0.01uF
CBYP1
0.01uF
C38
2.2uF
C38
2.2uF
J7J7
1
2
3
4
5
R52
2K
R52
2K
R59 0R59 0
R45
4.99K
R45
4.99K
R44
100K
R44
100K
JP1JP1
1
2
3
R57 0R57 0
R51
10
R51
10
R60 0R60 0
R49
6.19K
R49
6.19K R50
3.4K
R50
3.4K
J8
MILL MAXX
802-40-008-20-001000
J8
MILL MAXX
802-40-008-20-001000
GND 1
SCL 2
SDA 3
GPIO 4
RUN 5
SHARE_CLK 6
SYNC 7
DNI 8
DNI 9
DNI 10
R48
10K
R48
10K
Q5
2N7002A
Q5
2N7002A
2 3
1
R39 10KR39 10K
J9
MILL MAXX
803-43-008-20-001000
J9
MILL MAXX
803-43-008-20-001000
GND
1
SCL
2
SDA
3
GPIO
4
RUN
5
SHARE_CLK
6
SYNC
7
DNI
8
DNI
9
DNI
10
C55
0.1uF
C55
0.1uF
schematic Diagram
12
dc2088af
DEMO MANUAL DC2088A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2014
LT 0114 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
