DC2253A - Demo Manual

DEMO MANUAL DC2253A
LTC3789EGN
300W 2-Phase Interleaved
Synchronous Buck-Boost Converter
Description
Demonstration circuit 2253A is a high power, high efficiency, 2-phase interleaved synchronous buck-boost
converter with a 6V to 36V input range. It can supply a
25A maximum load current with a 12V output. This demo
board features 2x LTC3789EGN controllers.
The LTC®3789 is a high performance current-mode
buck-boost switching regulator controller that operates
from input voltages above, below or equal to the output
voltage, while an output current feedback loop provides
support for output current limit and battery charging. With
a wide 4V to 38V (40V maximum) input and output range
and seamless, low noise transitions between operating
regions, the LTC3789 is ideal for automotive, telecom and
battery-powered systems.
Performance Summary
PARAMETER
The light load operating mode of the controller is determined through the MODE/PLLIN pin. By default, the
forced continuous mode (CCM) operation is pre-selected
on this demo board. Switching frequency is preset at
about 200kHz. Two paralleling schemes are available for
this demo board and by default the method of shared ITH
pins is adopted. Please refer to the Quick Start Procedure
section for the optional Master-Slave paralleling scheme.
To shut down the converter, force the RUN pin below 1.2V
(JP1: OFF) Please refer to LTC3789 data sheet for more
detailed information.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2253A
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.
Specifications are at TA = 25°C
CONDITION
Input Voltage Range
6V to 36V
Output Voltage, VOUT
VIN = 6V to 36V, IOUT = 0A to 25A
Maximum Output Current, IOUT
VIN = 6V to 36V, VOUT = 12V
Typical Output Ripple
VIN = 36V, IOUT = 25A (20MHz BW)
VIN = 12V, IOUT = 25A (20MHz BW)
VIN = 6V, IOUT = 25A (20MHz BW)
Typical Efficiency
VIN = 12V, VOUT = 12V, IOUT = 25A, see Figure 3
Typical Switching Frequency
VALUE
12V ±2%
25A
36mVP-P
200mVP-P
380mVP-P
97.8%
200kHz
dc2253af
1
DEMO MANUAL DC2253A
Quick Start Procedure
Demonstration circuit 2253A is easy to set up to evaluate
the performance of the LTC3789EGN. Refer to Figure 1
for the proper measurement equipment setup and follow
the procedure below:
1.With power off, connect the input power supply to VIN
(6V to 36V) and GND (input return).
2.Connect the 12V output load between VOUT and GND
(Initial load: no load).
3.Connect the DVMs to the input and output. Set the
default jumper position, JP1: ON.
4.Turn on the input power supply and check for the proper
output voltages. VOUT should be 12V ±2%.
5.Once the proper output voltages are established, adjust the loads within the operating range and observe
the output voltage regulation, ripple voltage and other
parameters.
Optional Master-Slave Paralleling Scheme
Besides the default paralleling scheme by tying the ITH pins
together, another optional Master-Slave scheme can be
achieved on the demo board to obtain a better sharing of
the inductor currents and output currents between phases.
Please refer to the schematic in Page 8. To implement it,
1.Remove R67, R69 and R70.
2.Populate R68, R71 with 0Ω.
3.Set RFB3 5~10% higher than RFB1 and set RFB4 = RFB2.
4.Choose the current reference divider R65 and R66 so
that when the Vout is regulated, the voltage drop on
R65 is equal to VILIM, where VILIM is the output current
limit threshold voltage. For example, when ILIM pin is
grounded, VILIM = 50mV. For VOUT = 12V, select R65
= 100Ω and R66 = 24kΩ and then the voltage drop on
R65 will be 50mV.
Note: When measuring the output or input voltage ripple,
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.
2
dc2253af
DEMO MANUAL DC2253A
Quick Start Procedure
Figure 1. Proper Measurement Equipment Setup
+
VOUT
–
COUT
GND
Figure 2. Measuring Output Voltage Ripple
dc2253af
3
DEMO MANUAL DC2253A
Quick Start Procedure
100
14
EFFICIENCY (%)
96
94
92
90
88
86
84
36VIN
12VIN
6VIN
82
80
0
5
10
15
20
LOAD CURRENT (A)
25
PHASE OUTPUT CURRENT (A)
98
±2%
12
10
8
6
4
2
0
30
0
5
10
15
20
TOTAL OUTPUT CURRENT (A)
DC2253A F04
DC2253A F03
Figure 3. Efficiency vs Load Current (VOUT = 12V, CCM)
14
±1.4%
12
10
8
6
4
2
0
±3.7%
12
10
8
6
4
2
0
5
10
15
20
TOTAL OUTPUT CURRENT (A)
25
DC2253A F05
Figure 5. Output Current Sharing (VIN = 12V, VOUT = 12V)
4
Figure 4. Output Current Sharing (VIN = 6V, VOUT = 12V)
PHASE OUTPUT CURRENT (A)
PHASE OUTPUT CURRENT (A)
14
25
0
0
5
10
15
20
TOTAL OUTPUT CURRENT (A)
25
DC2253A F06
Figure 6. Output Current Sharing (VIN = 36V, VOUT = 12V)
dc2253af
DEMO MANUAL DC2253A
Quick Start Procedure
Figure 7. Thermal Performance (VIN = 12V, VOUT = 12V, 25A Load, No Air Flow)
Figure 8. Thermal Performance (VIN = 6V, VOUT = 12V, 25A Load, 200LFM)
dc2253af
5
DEMO MANUAL DC2253A
Quick Start Procedure
Figure 9. Thermal Performance (VIN = 36V, VOUT = 12V, 25A Load, 200LFM)
6
dc2253af
DEMO MANUAL DC2253A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
2
2
CC1, CC4
CAP., C0G, 100pF, 50V, 10% 0603
AVX, 06035A101KAT2A
2
CC2, CC3
CAP., X7R, 0.01µF, 50V, 10% 0603
AVX, 06035C103KAT2A
3
5
CSS1, C15, C39, C61, CSS
CAP., X7R, 0.1µF, 50V, 10% 0603
AVX, 06035C104KAT2A
4
0
CF1, CF2, CF3, C7, C8, CF, C23
CAP., 0603 OPTIONAL
5
C29, C30, C31-C34
6
C12, C13, C59, C60
CAP., 1206 OPTIONAL
7
C14, C35, C36, C41, C46-C50
CAP., 1210 OPTIONAL
8
4
C62, C63, C66, C67
CAP., X7R, 2.2µF, 50V, 10% 1206
KEMET C1206C225K5RACTU
9
4
C64, C65, C68, C69
CAP., X7R, 2.2µF, 25V, 10% 1206
AVX 12063C225KAT2A
10
2
C11, C51
CAP., NPO, 68pF, 50V, 10% 0603
AVX, 06035A680KAT2A
11
2
C10, C38
CAP., X5R, 4.7µF, 10V, 10% 0603
AVX, 0603ZD475KAT2A
12
2
C24, C55
CAP., X7R, 1µF, 16V, 20% 0603
AVX, 0603YC105MAT2A
13
4
CIN1, CIN2, CIN3, CIN4
CAP., ALUM, 270µF, 50V, 20%
SUN ELECTRONICS, 50ME270WX+T
14
4
COUT1, COUT2, COUT3, COUT4
CAP., OS-CON, 330µF, 25V, 20%
SANYO, 25SEPF330M
15
12
C16, C17, C19, C20, C21, C28
CAP., X7R, 22µF, 16V, 20% 1210
AVX, 1210YC226MAT2A
16
C40, C42, C43, C44, C53, C58
17
4
C4, C5, C22, C52
CAP., X7R, 0.22µF, 16V, 20% 0603
AVX, 0603YC224MAT2A
18
8
C9, C25, C26, C27
CAP., X7R, 3.3µF, 50V, 20% 1210
AVX, 12105C335MAT2A
19
C37, C45, C54, C56
20
2
C18, C57
CAP., X5R, 10µF, 6.3V, 20% 1206
AVX, 12066D106MAT2A
21
4
D4, D7, D12, D13
DIODE, SCHOTTKY 1A 60V POWERDI123
DIODE INC., DFLS160-7
22
4
D5, D6, D10, D11
DIODE, SCHOTTKY 3A 40V SMA
DIODE INC., B340A-13-F
23
1
D8
DIODE, ZENER 5.1V 350MW SOT23-3
DIODE INC., BZX84C5V1-7-F
24
1
JP1
HEADER, 3 PIN 0.079 SINGLE ROW
SAMTEC, TMM-103-02-L-S
25
1
XJP1
SHUNT, .079" CENTER
SAMTEC, 2SN-BK-G
26
4
J2, J4, J5, J6
STUD, TESTPIN
PEM KFH-032-10
27
8
J1, J2, J3, J4 (x2)
NUT, BRASS 10-32
ANY #10-32
28
4
J1, J2, J3, J4
RING, LUG #10
KEYSTONE, 8205, #10
29
4
J1, J2, J3, J4
WASHER, TIN PLATED BRASS
ANY #10, #10EXT BZ TN
30
2
L1, L2
INDUCTOR, 3µH
COILCRAFT LNC. XAL1580-302ME
31
6
Q2, Q4, Q6, Q16, Q17, Q12
MOSFET N-CHANNEL
INFINEON, BSC027N04LS
MOSFET N-CHANNEL
INFINEON, BSC010NE2LS
32
6
Q3, Q5, Q10, Q15, Q9, Q14
33
0
Q7, Q8, Q11, Q13 OPT
34
1
RFB1
RES., CHIP., 113k, 0.1W, 1% 0603
YAGEO, RC0603FR-07113KL
35
1
RFB2
RES., CHIP., 8.06k, 0.1W, 1% 0603
YAGEO, RC0603FR-078K06L
36
4
R18, R32, R35, R64
RES., CHIP., 0.006Ω, 2W, 1% 2512
SUSUMU., KRL3264E-C-R006
37
2
R2, R59
Sense RES 0.003Ω 1W 1% 2512 SMD
YAGEO, PR2512FKF070R003L
38
12
R3, R4, R9, R10, R13, R14, R36
RES., CHIP., 100Ω, 0.1W, 1% 0603
YAGEO, RC0603FR-07100RL
YAGEO, RC0805JR-075R1L
39
R37, R40, R41, R53, R54
40
2
R5, R58
RES., CHIP, 5.1Ω, 0.1W, 5% 0805
41
0
R6, R12, R15, R22, R28, R29, R38, R39
RES., 0603, OPTIONAL
42
R63, R68, R71, R74, R75, R65, R66, R73
dc2253af
7
DEMO MANUAL DC2253A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
43
RFB3, RFB4
44
R28, R29, R60, R61
RES., 1206, OPTIONAL
MANUFACTURER/PART NUMBER
45
2
R7, R50
RES., CHIP., 100k, 0.1W, 1% 0603
YAGEO, RC0603FR-07100KL
46
1
R8
RES., CHIP., 10Ω, 0.1W, 5% 0603
YAGEO, RC0603JR-0710RL
47
2
R26, R55
RES., CHIP., 10Ω, 0.1W, 5% 0805
YAGEO, RC0805JR-0710RL
48
17
R1, R11, R17, R23, R25
RES., CHIP., 0Ω 1% 0603
YAGEO, RC0603FR-070RL
49
R27, R43, R46, R48, R51, R76
50
R57, R62, R67, R69, R70, R72
51
1
R20, R33
RES., CHIP., 0Ω 2512
TEPRO, RN5326
52
2
R16, R45
RES., CHIP., 1k, 0.1W, 1% 0603
YAGEO, RC0603FR-071KL
53
6
RC1, R21, R24, R34, R44, RC
RES., CHIP., 10k, 0.1W, 1% 0603
YAGEO, RC0603FR-0710KL
54
1
R30
RES., CHIP., 41.2k, 0.1W, 1% 0603
YAGEO, RC0603FR-0741K2L
55
1
R31
RES., CHIP., 12.1k, 0.1W, 1% 0603
YAGEO, RC0603FR-0712K1L
56
1
R56
RES., CHIP., 499k, 0.1W, 1% 0603
YAGEO, RC0603FR-07499KL
57
5
TP1, TP2, TP3, TP7, TP20
TESTPOINT, TURRET, .061" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
58
6
TP4, TP5, TP6, TP10-TP12
TESTPOINT, TURRET, .094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
59
2
U1, U2
I.C.,LTC3789EGN SSOP N
LINEAR TECH., LTC3789EGN#PBF
60
1
U3
I.C.,LTC6908CDCB-1 2mm × 3mm
LINEAR TECH., LTC6908CDCB-1
MTGS AT 4 CORNERS
61
4
62
1
63
2
8
STENCILS
STAND-OFF, NYLON 0.5"
KEYSTONE, 8833 (SNAP ON)
FAB, PRINTED CIRCUIT BOARD
DEMO CIRCUIT FT228A
STENCIL BOTH SIDES
STENCIL FT228A
dc2253af
A
B
C
D
TP6
TP5
CSS
0.1uF
TP11
TP4
SS
EXTVCC1
PLLIN1
OFF
TP12
TP10
PLLIN1
3
5
R25
0
R22
OPT
INTVCC1
RUN
CC2
100
OPT
VIN1+
VOUT
R14
100
OPT
C8
0.01uF
C7
R10
R9
RC
10K
R21
10K
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
4
4.7uF
C10
0805
14
13
12
11
10
9
8
7
6
5
3
2
1
C11
68pF 4
CC1 100pF
R13
100
100
VFB1
NOTE: UNLESS OTHERWISE SPECIFIED
R24
10K
R75
OPT
INTVCC1
EXTVCC
R16 1K
R31
12.1K
41.2K
OPT
CF
OPT
VOS+
ITH1
RFB1
113K
D8
BZX84C5V1
R15
CF1 OPT
RFB2 8.06K
JP1 VIN1+
RUN
1
R30
ON
2
ITH1
SS
SGND
PGOOD1
R7
100K
INTVCC1
4
U1
IOSENSE-
IOSENSE+
ILIM
VOUTSNS
VINSNS
RUN
FREQ
MODE/PLLIN
SGND
ITH
SENSE1-
SENSE1+
SS
VFB
TRIM
SW2
TG2
BOOST2
BG2
EXTVCC
INTVCC
VIN
BG1
PGND
BOOST1
TG1
SW1
PGOOD
LTC3789EGN
R3 100
15
16
17
18
19
20
21
22
23
24
25
26
27
28
0
R4
100
0805
R26 10
16V
C24 1uF
G
VIN1+
C22
0.22uF
16V
R6 OPT
3
R12 OPT
R18
0.006
2W
6.3V
D7
DFLS160
R1 0
C18 10uF
G
Q4
BSC027N04LS
Q7 (OPT)
C4
0.22uF
16V
VOUT
INTVCC1
D4
DFLS160
R27 0
R11
R23 0
R17 0
5.1
R5
Q2
Q6
BSC027N04LS
C15
0.1uF
50V
3
D
S
D
S
R32
0.006
2W
D5
B340A
C12
(OPT)
1206
R28
(OPT)
1206
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
R29
(OPT)
C13
(OPT)
R66
(OPT)
Jeoffrey W.
SCALE = NONE
APP ENG.
HZ
__
ECO
1
330uF
25V
+ COUT2
VOUT
CIN2
270uF
50V
+
VOUT
GND
GND
6V - 36V
VIN
VIN1+
J4
TP1
TP2
GND
VOS-
VOS+
12V @ 25A MAX
R8
10
VOS+
J3
J2
TP7
J1
TP3
DATE
CHARLIE Z. 6-9-11
APPROVED
DATE:
N/A
SIZE
1
SHEET 1
LTC3789EGN
DEMO CIRCUIT 2253A
Wednesday, September 03, 2014
IC NO.
1
OF 3
REV.
HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
VIN
PRODUCTION
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
330uF
25V
CIN1
270uF
50V
+
+ COUT1
2
REV
TITLE: SCHEMATIC
1W
2512
R2 0.003
R20 0
APPROVALS
C64
C65
2.2uF
1206
50V
PCB DES.
C31
C30
C29
C23
(OPT)
1210
C32
C63
2.2uF
50V
1206
IREF1
C62
2.2uF
50V
1206
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.
G
Q9
Q5
BSC010NE2LS
XAL1580-302ME
L1 3uH
D6
2
C28
C21
C20
C19
C17
C16
22uF
16V
1210
R65
(OPT)
C14
3.3uF
50V
(OPT)
1210
B340A
VOUT1
C35
3.3uF
50V
(OPT)
1210
Q3
BSC010NE2LS
Q8
(OPT)
G
C9
C25
C26
C27
3.3uF
50V
1210
D
S
D
S
5
A
B
C
D
DEMO MANUAL DC2253A
Schematic Diagram
dc2253af
9
A
B
C
EXTVCC
Run
R76 0
PLLIN2
SS
5
R45 1K
CSS1
0.1uF
R62
0
R63
OPT
CC3
VIN2+
VOUT
R41
100
C34 OPT
C33 OPT
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
4
RC1
10K
R44
10K
4
4.7uF
C38
2
1
U2
0805
14
13
12
11
10
9
8
7
6
5
IOSENSE-
IOSENSE+
ILIM
VOUTSNS
VINSNS
RUN
FREQ
MODE/PLLIN
SGND
ITH
SENSE1-
SS
VFB
TRIM
SW2
TG2
BOOST2
BG2
EXTVCC
INTVCC
VIN
BG1
PGND
BOOST1
TG1
SW1
15
16
17
18
19
20
21
22
23
24
25
26
27
28
R36 100
PGOOD
LTC3789EGN
3
SENSE1+
C51
68pF 4
R67
0
VFB1
CC4 100pF
R40
100
100
100
0.01uF
R53
R54
R68 OPT
NOTE: UNLESS OTHERWISE SPECIFIED
R73
R34
10K
R74
OPT
INTVCC2
CF2
OPT
VOS+
(OPT)
R69
0
INTVCC2
0
R72
ITH1
CF3 OPT
RFB4 (OPT)
RFB3
(OPT)
R50
100K
INTVCC2
0
5.1
C52
0.22uF
16V
R38 OPT
0
3
R35
0.006
2W
6.3V
D13
DFLS160
R460
C57 10uF
G
Q12
BSC027N04LS
Q13
(OPT)
VOUT
R70
G
C5
0.22uF
16V
R39 OPT
R71
OPT
IREF1
R37 100
0805
R55 10
C55 1uF
16V
INTVCC2
D12
DFLS160
R57 0
R51
R48 0
R43 0
VIN2+
R58
Q16
Q17
BSC027N04LS
C39
0.1uF
50V
3
D
S
D
S
R64
0.006
2W
D11
B340A
C60
(OPT)
1206
R61
(OPT)
1206
L2
3uH
2
Jeoffrey W.
APP ENG.
SCALE = NONE
HZ
1
330uF
16V
+ COUT4
TP20
DATE
VIN2+
CHARLIE Z. 6-9-11
APPROVED
DATE:
N/A
SIZE
1
SHEET 2
LTC3789EGN
DEMO CIRCUIT 2253A
Wednesday, September 03, 2014
IC NO.
1
OF 3
REV.
HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CIN3
270uF
50V
VOUT
+
VIN
PRODUCTION
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
330uF
16V
+
+ COUT3
CIN4
270uF
50V
2
REV
TITLE: SCHEMATIC
1W
2512
__
ECO
R59 0.003
APPROVALS
C68
C69
2.2uF
50V
1206
C67
2.2uF
50V
1206
R33 0
PCB DES.
(OPT)
1210
C50
C47
C49
C46
C48
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
R60
(OPT)
C59
(OPT)
C53
C44
C42
C40
C43
C58
22uF
16V
1210
C66
2.2uF
50V
1206
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.
G
Q14
Q15
BSC010NE2LS
XAL1580-302ME
2
C41
3.3uF
50V
(OPT)
1210
D10
B340A
C36
3.3uF
50V
(OPT)
1210
VOUT2
Q10
BSC010NE2LS
Q11
(OPT)
G
C37
C56
C45
C54
3.3uF
50V
1210
D
S
D
10
S
D
5
A
B
C
D
DEMO MANUAL DC2253A
Schematic Diagram
dc2253af
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
SET
GND
V+
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
4
5
6
SCALE = NONE
3
PLLIN1
PLLIN2
TECHNOLOGY
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
1
DATE:
N/A
SIZE
2
1
SHEET 3
LTC3789EGN
DEMO CIRCUIT 2253A
Tuesday, May 06, 2014
IC NO.
OF 3
1
REV.
HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER
Jeoffrey W. TITLE: SCHEMATIC
HZ
APPROVALS
OUT1
OUT2
MOD
U3
LTC6908CDCB-1
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
2
1
CUSTOMER NOTICE
C61
0.1uF
R56
499K
INTVCC1
4
GND
7
D
5
A
B
C
D
DEMO MANUAL DC2253A
Schematic Diagram
dc2253af
11
DEMO MANUAL DC2253A
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
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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
dc2253af
LT 1014 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
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 LINEAR TECHNOLOGY CORPORATION 2014
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