DC2088A - Demo Manual

DEMO MANUAL DC2088A
High Density LTC3880
Step-Down DC/DC Converter with
Power System Management
Description
Demonstration circuit 2088A is a high current, high density, two-phase single output synchronous buck converter
featuring the LTC3880EUJ, a dual-phase current mode
controller. The LTC®3880 has the PMBus interface and
power system management functions.
The layout of DC2088A is very compact and the total solution 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
LTC3880. To fully explore the extensive power system
management features of the parts, download the GUI
software LTpowerPlay 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.
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
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
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
VIN
Input Supply Range
VOUT
Output Voltage Range
IOUT
Output Current Range
fSW
Factory Default Switching
EFF
Peak Efficiency
IOUT = 0A TO 50A, VIN = 7.0V to 14V
MIN
TYP
MAX
7
12
14
V
0.8
1.0
1.8
V
50
A
0
VOUT = 1.0V, See Figures 4.
UNITS
425
kHz
87.8
%
dc2088af
1
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:
3. Make sure RUN switch (SW) is OFF.
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.
5. Turn on RUN switch as desired.
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.
2
4. Turn on the power at the input.
NOTE. Make sure that the input voltage does not exceed 16V.
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.
dc2088af
DEMO MANUAL DC2088A
Quick Start Procedure
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.
+12V
POWER SUPPLY
USB CABLE
VIN
USB TO 12C/PMBus DONGLE
DC1613A
12-PIN
CONNECTOR
VOUT
DEMO BOARD
DC2088A
LOAD
dc2088a F01
Figure 1. Demo Setup with PC
DC1613A
CONNECTOR
RUN
SWITCH
+
+
–
+
VIN
–
VOUT +
SHUNT
–
+
LOAD
POWER
SUPPLY
IIN
–
–
dc2088a F02
Figure 2. Power Test Setup
dc2088af
3
DEMO MANUAL DC2088A
Quick Start Procedure
MEASURING EFFICIENCY (See Figure 2)
EVALUATING THE LTC3880-1
• To accurately measure efficiency of any configuration,
do the following:
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.
• 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 efficiency calculation.
To accurately measure efficiency of a demo board containing 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
–
COUT
GND
Figure 3. Measuring Output Voltage Ripple
4
dc2088af
DEMO MANUAL DC2088A
Quick Start Procedure
90
89
EFFICIENCY (%)
88
87
86
85
84
83
12VIN 1.0VOUT 425kHz
82
12VIN 0.9VOUT 425kHz
81
12VIN 1.2VOUT 425kHz
80
0
10
20
30
40
50
60
LOAD CURRENT (A)
dc2088a F04
Figure 4. Typical Efficiency Curves DC2088A, 12VIN, fSW = 425kHz, VOUT = 1.2V, 1.0V, 0.9V
LTpowerPlay Software GUI
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology power system 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 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: www.linear.com/ltpowerplay
To access technical support documents for LTC Digital
Power Products visit Help. View online help on the
LTpowerPlay menu.
dc2088af
5
DEMO MANUAL DC2088A
Quick Start Procedure
Figure 3. Measuring Output Voltage Ripple
LTpowerPlay QUICK START PROCEDURE
The following procedure describes how to use LTpowerPlay 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:
6
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:
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:
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:
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.
dc2088af
7
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
LTC., 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
8
dc2088af
DEMO MANUAL DC2088A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
10
11
1
D1
LED GREEN S-GW TYPE SMD
ROHM, SML-010FTT86L
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
LTC., LT3029IMSE#PBF
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
Hardware
dc2088af
9
A
B
C
VDD25
VDD33
GND
GND
VIN
7V-14V
E2
J2
R35 OPT
R33 24.9k
R31 16.2k
R29 OPT
R26 OPT
R24 10k
R22 10k
R20 10k
R18 10k
E1
J1
WP
GPIO1B
GPIO0B
R36 0
5
VTRIM_CFG
R34 4.32k
VOUT_CFG
R32 17.4k
FREQ_CFG
R66
0
ALERTB
SDA
SCL
+ C7
330uF
16V
SVP
+ C8
330uF
16V
SVP
VIN
R17
0
VDD33
R14
6.81K
C23
1nF
Q1
24
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
2. INSTALL SHUNTS AS SHOWN.
NOTE: UNLESS OTHERWISE SPECIFIED
R28
17.8K
R23
20K
VDD25
17
16
23
14
15
40
28
5
26
11
8
WP
RUN
9
10
SHARE_CLOCK
C25
10nF
ITH
SHARE_CLOCK
R19
10K
ADDRESS: 0X4B
C24
100pF
ALERTB
SYNC_A
SDA
SCL
R7
10k
VDD33
1
FREQ_CFG
ASEL
SC
WP
RUN0
RUN1
TSNS0
TSNS1
ITH0
ITH1
ALERT
SYNC
SDA
SCL
R6
4
C9
100nF
35
U2
LTC3880EUJ
TG0
ISNS0-
ISNS0+
BG0
SW0
BOOST0
VSENSE1
ISNS1-
ISNS1+
BG1
SW1
BOOST1
TG1
VSENSE0-
VSENSE0+
VDD33
C11
1uF
VDD33
C10
1uF
INTVCC
VDD25
INTVCC
VDD25
22
VIN
FREQ_CFG
33
INTVCC
25
VDD33
R30
0
GPIO1B
SGND AND PGND
CONNECTED AT
GPIO0B
A SINGLE NODE
NEAR U2
27
4
3
32
29
31
30
2
1
7
6
36
39
37
38
C6
10uF
BG0
BG1
R4
OPT
VDR
VIN
VIN
3
C2
22uF
1210
C28
22uF
1210
C1
22uF
1210
3
PGND
PGND
PGND
PGND
PGND
VSWH
VIN
VIN
VIN
VIN
20
19
18
17
16
15
14
13
12
11
PGND
PGND
PGND
PGND
PGND
VSWH
VIN
VIN
VIN
VIN
C29
22uF
1210
20
19
18
17
16
15
14
13
12
11
C3
100nF
7
C26
100nF
R1
6
U1
FDMF6823A
PHASE
D
18
VOUT0_CFG
VOUT0_CFG
VOUT1_CFG
19
VIN
VTRIM1_CFG
21
VTRIM0_CFG
20
VTRIM_CFG
GPIO1
VDD25
GND
41
PGND
34
GPIO0
12
4
PGND
21
13
PGND
21
10
9
42
8
VIN
VIN
VIN
NC
C4
1uF
16V
0
5
41
CGND
GND
10
9
42
8
VIN
VIN
VIN
NC
PGND
22
PGND
23
7
C27
1uF
16V
R13 0
U3
FDMF6823A
PHASE
PGND
23
PGND
22
GH
PGND
24
PGND
26
5
41
4
27
4
PGND
25
6
GH
R3
10
VDR
1
C30
1uF
VDR
R15
10
PWM
VSWH
VSWH
VSWH
VSWH
VSWH
GL
CGND
NC
DISB#
PWM
31
32
33
34
35
36
37
38
39
40
BG0
31
32
33
34
35
36
37
38
39
40
BG1
VSWH
VSWH
VSWH
VSWH
VSWH
GL
CGND
NC
DISB#
C5
1uF
CGND
GND
26
PGND
24
2
VCIN
PGND
27
PGND
25
BOOT
PGND
BOOT
PGND
2
VCIN
VDRV
PGND
3
SMOD#
3
VDRV
PGND
28
VSWH
VSWH
VSWH
43
29
30
1
SMOD#
VSWH
VSWH
VSWH
28
10
43
29
30
5
L1
L2
0
0.22uF
R9
825
C37
C49
100uF
1210
C31
100uF
1210
C51
100uF
1210
C32
100uF
1210
C43
100uF
1210
C13
100uF
1210
C52
100uF
1210
C33
100uF
1210
C46
100uF
1210
C17
100uF
1210
C50
100uF
1210
C34
100uF
1210
C45
100uF
1210
C14
100uF
1210
C48
100uF
1210
C35
100uF
1210
C44
100uF
C15
100uF
1210
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
1uF
C36
C47
100uF
1210
C12
100uF
1210
VOUT
OPT
HZ
SCALE = NONE
YI S.
0
OPT
R12 R62
+
1
VSNSN
VSNSP
C20
OPT
+
VOUT
R10
30
1W
J4
E6
E4
J3
VOUT-
VOUT+
GND
VOUT
YI S.
DATE
2-13-13
DATE:
N/A
SIZE
DEMO CIRCUIT 2088A
LTC3880EUJ
1
Monday, May 20, 2013
IC NO.
SHEET 1
1
REV.
OF 2
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C21
OPT
+
PRODUCTION
APPROVED
REVISION HISTORY
DESCRIPTION
TECHNOLOGY
C18
C19
470uF 470uF
+
1
REV
TITLE: SCHEMATIC
R21
C54
470uF
C53
470uF
0
+
__
ECO
+
R11
APPROVALS
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.
0.22uF
1uF
C16
GPIO0B
GPIO0B
R25
825
0.16uH
R16
R27
825
0
0.16uH
C22
R8
825
R2
R63
OPT
R5
OPT
2
A
B
C
D
DEMO MANUAL DC2088A
Schematic Diagram
dc2088af
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
D
SDA
SCL
WP
VCC
5
6
7
8
MILL MAXX
DNI
DNI
DNI
SYNC
SHARE_CLK
RUN
GPIO
SDA
SCL
GND
RIGHT
ANGLE
HEADER
24LC025-I/ST
VSS
A2
A1
A0
U4
1
2
3
4
5
6
7
8
9
10
11
12
5
802-40-008-20-001000
J8
4
3
2
1
TO DC1613A
AUXP
SDA
GND
SCL
LGKPWR
ALERTB
GPIO_1
OUTEN_0
OUTEN_1
GND
AUXSCL
AUXSDA
J6
3V3
4
10
7
6
5
4
3
2
1
10
SHARE_CLK SYNC
OFF
ON
9
EXT
DRIVER
9
SCL SDA GPIO0B RUN
R46
4.99K
DNI
DNI
DNI
SYNC
SHARE_CLK
RUN
GPIO
SDA
SCL
GND
J9
E16
E15
RIGHT
ANGLE
SOCKET
GND
C55 VDR
0.1uF
D3
MILL MAXX
803-43-008-20-001000
2
R43
100K
8
R60 0
R59 0
R58 0
R57 0
R56 0
R55 0
R54 0
EESDA
EESCL
R45
4.99K
JP1
8
7
6
5
4
3
2
1
100nF
AUXVCC
C41
VIN
PULSE IN
1206
COUT2
10uF
VDR
GND
VIN
E12
R52
2K
R49
6.19K
CBYP1
0.01uF
C40
1uF
U5
LT3029IMSE
DO NOT EXCEED 5% DUTY CYCLE!
E11
16
1
3
4
15
R41
0.01
2512
ADJ1
BYP1
VOUT1
VOUT1
SHDN1
VIN
10K
R38
4
Q2
RJK0305DPB
DYNAMIC LOAD CIRCUIT
3
C38
2.2uF
0805
VOUT
ADJ2
BYP2
VOUT2
VOUT2
SHDN2
J5
VOUT
J7
9
8
6
7
10
R53
2K
R50
3.4K
IOUT
TST
VOUT
CBYP2
0.01uF
NOTE:
PULSE OUT
10mV / AMP
C39
1uF
0805
1
1
2
3
4
5
2
3
4
5
SCL
SDA
3
2
OFF
ON
R44
100K
Q3
TP0101K
R39 10K
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
2
R40
15.8K
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.
CUSTOMER NOTICE
JP2
LED
COUT1
10uF
1206
+5V
VIN
VIN
3V3
2
1
ALERTB
4
1
3
1
2
GPIO0B
YI S.
APP ENG.
SCALE = NONE
HZ
PCB DES.
APPROVALS
VDD33
SW
RUN
OFF
ON
2
R47
OPT
C42
10nF
R51
10
R48
10K
VDD33
ALERTB
1
D2
RED
ALERT
TP0101K
Q4
R42
127
+5V
DATE:
N/A
SIZE
1
DEMO CIRCUIT 2088A
LTC3880EUJ
Monday, May 20, 2013
IC NO.
SHEET 2
1
OF 2
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
HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT
TECHNOLOGY
Q5
2N7002A
GREEN
GPIO0B
TITLE: SCHEMATIC
RUN
GPIO0B
1
D1
R37
200
+5V
3
2
5
1
2
3
14
VIN1
12
VIN2
13
VIN1
NC
2
GND
5
1
3
11
VIN2
GND
17
1
3
2
3
5
A
B
C
D
DEMO MANUAL DC2088A
Schematic Diagram
dc2088af
11
DEMO MANUAL DC2088A
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
12 Linear Technology Corporation
dc2088af
LT 0114 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
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