Linear Technology DC1977A-A Quick setup guide

1
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
Description
LTC4121EUD/LTC4121EUD-4.2
400mA Synchronous Buck
Battery Charger
DC1977A-A LTC4120EUD-4.2 (Fixed Output)
DC1977A-B LTC4121EUD (Adjustable Output)
Demonstration Board DC1977A showcases the
LTC4121-4.2 and LTC4121 40V, 400mA synchronous-
buck battery charger integrated circuit. The DC1977A
supports the maximum-power-point tracking (MPPT)
feature of the LTC4121EUD to optimize power delivery
from photovotalic cells or highly resistive sources.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
performance summary
Demo BoarD application
The LTC4121 and LTC4121-4.2 feature constant-current–
constant-voltage charging capability suitable for lithium-
ion or lead-acid cells. The LTC4121-4.2 supports charging
a single lithium-ion cell with a cell voltage of 4.2V. The
LTC4121 may be programmed to charge battery voltages
up to 18V with a resistive divider.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1977
Specifications are at TA= 25°C
High Efficiency, Wide Input Voltage Range Charging with LTC4121 LTC4121 Efficiency vs VIN
SYMBOL PARAMETER CONDITIONS
Note: Reference designators refer to Schematic on p. 7.
MIN TYP MAX UNITS
IN DC1977A Input Voltage I(IN) < 800mA 4.4 40 V
PVIN DC1977A PV Cell Input I(IN) < 800mA 5 40.5 V
V(BAT) DC1977A BAT Pin Voltage R11 = 1.40MΩ, R12 = 1.05MΩ 2.5 4.25 V
I(BAT) DC1977A BAT Pin Current V(BAT) = 3.7V; DC1977A; (R7) = 3.01kΩ; JP1 (“MPPT”) = ‘OFF’ 383 402 421 mA
INTVCC
BOOST
IN
RUN
MPPT
LTC4121
dc1977a F01
GND
RMPPT1
787k
RMPPT2
121k
RRUN1
261k
RRUN2
324k
CIN
10µF
RPROG
3.01k
VIN
VBAT + 200mV
TO 40V
CBOOST
22nF
LPS4018-333ML
CINTVCC
2.2µF
FREQ +
CBAT
47µF
RFB1
1.05M
RFB2
1.40M
Li-Ion
+
–
SW
CHGSNS
BAT
FB
FBG
PROG
VIN (V)
5
70
EFFICIENCY (%)
75
85
80
90
95
100
10 15 20 25 30 35 40
RPROG = 6.04k
RPROG = 3.01k
VBAT = 4.1V
DC1977A F02

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dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
assemBly test proceDure
Refer to Figure 1 for the proper measurement equipment
setup and jumper settings and follow the procedure below.
1. Set JP1 (“MPPT”) to ‘ON’, set PS1 to 3.6V and turn
on.
2. Connect PS2 to point A, set to 15V and turn on.
3. Verify that VM1 indicates 3.3V to 3.9V, and then verify
that AM1 indicates 387mA to 417mA. Verify that VM2
shows 14.5V to 15.1V. There is only a series diode
between PV+and the VIN pin of the LTC4121. The
purpose of this diode is prevent backfeeding a PV
cell, if connected. A single diode Vfis insufficient to
activate the MPPT feature, and the LTC4121 delivers
full charge current to the battery.
4. Turn PS2 off, move connection to point B, and turn
PS2 on.
5. Verify that VM1 indicates 3.3V to 3.9V, and then verify
that AM1 indicates 387mA to 417mA. Verify that VM2
shows 12.6V to 13.2. The source impedance of the
power supply is now ≈ 16Ω. But this impedance still
allows delivering full charge current without engaging
the MPPT feature.
6. Turn PS2 off, move connection to Point C, and turn
PS2 on.
7. Verify that VM1 indicates 3.3V to 3.9V, and then Verify
that AM1 indicates 105mA to 115mA. Verify that VM2
shows 10.6V to 11.3V. The source impedance of the
power supply is now 98Ω. The MPPT feature has
engaged and the charge delivered to the battery has
been reduced to allow VIN to stay at the programmed
MPPT point.
8. Set JP1 (“MPPT”) to ‘OFF’, test is finished.
+
–
+
–
BC
PS2
15V POWER SUPPLY
0.25A
+
–
PS1
3.6V BIPOLAR SUPPLY
1A
+
–
– +
–
+–
–
AM1
3.6Ω VM1
VM2
15.8Ω
2W
82.4Ω
2W
AM2
A
DC1977a F03
Figure1. DC1977A Equipment Setup
Note:All connections from equipment should be kelvin-connected directly to the board pins
which they are connected on this diagram. All input or output leads should be twisted pair.

3
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
theory of operation
The LTC4121EUD-4.2/LTC4121EUD is a 4.4V ~ 40V input
buck topology battery charger with maximum power point
tracking (MPPT) for use with PV cells or highly resistive
power supplies. The buck-topology charger uses current
mode control for stable operation.
LTC4121EUD ENABLE
The LTC4121 can be enabled or disabled via the RUN pin,
and this functionality can be accessed via JP2, the RUN
jumper. When JP2 is in the “ENABLE” position, R3 and
R4 ensure that the LTC4121 is not enabled until Vin is
greater than 4.4V.
Note:Do not float the LTC4121 RUN pin. Operate
the demo board with JP2 in either the DISABLED or
ENABLED position.
Buck Charger
The heart of the LTC4121EUD is the buck-topology bat-
tery charger. The buck-topology charger is a synchronous,
current-mode-control regulator with N-channel FETs. The
use of N-channel FETs minimizes conduction losses, and
requires only a single external 0.022µF capacitor to gener-
ate the high-side gate drive.
The LTC4121EUD can charge up to four Li-Ion cells in
series, and supports a maximum battery voltage of 18V.
The LTC4121EUD-4.2 is optimized for charging a single
Li-Ion cell to a fixed cell voltage of 4.2V.
The current in the buck inductor passes through a small
on-die resistor for current measurement, and then goes
back out to the BAT pin. The battery is connected to the
BAT pin;this allows the LTC4121EUD to measure not only
the cycle-by-cycle current, but also the average current.
The cycle-by-cycle current is used by the current-mode
buck regulator, and the average current is the battery
charge current as programmed by RPROG. On DC1977A,
RPROG = 3.01kΩ, so I(BAT) = 402mA provided that the
MPPT function does not reduce the current.
The buck regulator acts as a current source when the
battery is in the constant-current charging region and as
a classic voltage output buck regulator when the battery
is in the constant-voltage charging region.
The battery charge current is programmed by
RPROG=3.01kΩ. The equation for RPROG is:
RPROG =hPROG •
V
PROG
ICHG
=986 •
1.227V
0.4 =3.01kΩ
The LTC4121EUD provides a switching frequency select
pin, FREQ, to select between 750kHz and 1.5MHz;this
function is accessed by JP4, the “FREQ” jumper.
Note: Do not float the LTC4121 FREQ pin. Operate the
demo board with JP3 in either the 750kHz or 1.5MHz
position.
Figure2 shows various nodes of interest with VIN = 5V,
and the switching frequency at 750kHz (T = 1.333µs), The
duty cycle is 86% for V(BAT) = 3.6V, not the 72% duty
expected from a buck regulator. When the battery voltage
is 3.6V, the charger is in constant-current mode, so the
control loop is forcing the output of the buck regulator
to the voltage necessary to push 400mA into the battery.
This “effective”voltage, 5 •0.86 = 4.3V, is the voltage
necessary to ensure that a 400mA average current is flow-
ing through the on-die sense resistor.
Figure3 shows the same nodes as Figure2, but with
VIN = 40V. The switching frequency is still 750kHz. The
duty cycle is ≈ 200ns/1.333µs, or 15%, but the period is
2.7µs. This is because the LTC4121 minimum on time was
greater than that needed to achieve 4.3V, and the LTC4121
starts to pulse skip to get the necessary average duty
cycle. The average duty cycle is 300ns/2.667µs=11%.
This produces an output voltage of 4.3V, so the battery
still charges at 400mA.
Maximum Power Point Tracking (MPPT)
The LTC4121EUD provides a maximum-power-point
tracking (MPPT) function for use with PV cells or highly

4
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
theory of operation
resistive power supplies. The MPPT pin allows program-
ming of the MPPT point as a percentage of the open-
circuit VIN (VOC). To access this functionality the demo
board provides JP1, the “MPPT” jumper, and R1 and R2.
It is important to note that the disabled position for MPPT
is the MPPT pin at V
IN
. To enable MPPT, set the MPPT
point as a fraction of V
OC
. See the discussion in Maximum
Power Point Tracking section of the LTC4121 data sheet.
When MPPT is enabled (not equal to VIN), the LTC4121EUD
periodically disconnects the load from the power source,
and measures VIN with no load =VOC. It then increases
the load on VIN to meet charger demand until the VMPPT
threshold is reached, after which it no longer increases
the load. This allows the MPPT voltage divider to set the
desired MPPT point as a percentage of VIN with no load.
Figure4 shows the LTC4121EUD operating from a source
impedance of 98Ω. The MPPT pin of the LTC4121EUD
sets the MPPT point to 0.75 of the open-circuit voltage.
First, VOC is determined by removing all load and letting
VIN rise to VOC. The power drawn from VIN is increased
until the voltage at VIN falls to the MPPT point, 0.75 •VOC
=0.75•15V = 11.25V. The resolution of the MPPT DAC
is 330mV, thus this example has the MPPT point at
11V. The LTC4121 stops drawing power at this point, and
the charge current (green) never exceeds 200mA, even
though the Rprog value was chosen for 400mA.
Figure5 shows the same system, but the source imped-
ance was lowered to 16Ω. Consequently, the full power
needed to meet the requirements of the programmed
charge current is available before VIN falls to the MPPT
voltage.
Figure2. Normal Operation, Zoom, VIN = 5.1V, DK. Blue = VIN,
Grn = ICHARGE, LT. Blue = VSW, Pk. = INTVCC, 750kHz
Figure3. Normal Operation, Zoom, VIN = 40V, DK. Blue = VIN,
Grn = ICHARGE, LT. Blue = VSW, Pk. = VBOOST, 750kHz

5
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
theory of operation
Battery capacitors C1 and C2
The maximum battery voltage for the LTC4121EUD is
18V, and for the LTC4121EUD-4.2, it is 4.2V. Analog
Devices recommends 47µF of capacitance on the BAT
pin, if the battery is not present. For the LTC4121EUD
the voltage rating of the capacitor will need to be 25V, so
two 22µF, 25V, MLCC capacitors are used. In the case of
the LTC4121EUD-4.2, a 6.3V capacitor will suffice, and
a single 47µF, 6.3V, MLCC capacitor is used for C1, with
C2 not placed.
Reverse-Blocking Circuit
Components Q1, R16 and C6 comprise a reverse-blocking
circuit. The circuit performs two functions. First, the cir-
cuit prevents the battery from back-charging the power
source when the power source is dormant (e.g., a solar
cell in the absence of illumination). Note that this func-
tionality can also be provided through D1. Second, when a
charged battery is connected to the circuit in the absence
of input voltage, current will flow from the battery into the
BAT pin and out the IN pin, charging C4. With battery volt-
ages in excess of ~10V, this current surge can destroy the
device. Note that this is not a problem when only one or
two series Li-Ion cells are employed. Thus, this reverse-
blocking circuit may not be necessary depending on the
application. If reverse-blocking is not required, C6 and
R16 also become unnecessary. These two components
provide a path to the BAT pin from which the LTC4121
derives bias for internal circuits which would be provided
by the battery directly in the absence of Q1. See, for exam-
ple, the application on the first page of this manual.
Figure4. MPPT Test, DK. Blue = VIN (Through 98Ω), Green = IL,
LT. Blue = V(SW), k = 0.15, VMPPT/VOC = 0.75
Figure5. MPPT Test, DK. Blue = VIN (Through 16Ω), Green = IL,
LT. Blue = V(SW), k = 0.15, VMPPT/VOC = 0.75

6
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC1977A General Bill of Materials
Required Circuit Components
1 1 C3 CAP, CHIP, X7R, 0.022µF, ±10%, 50V, 0402 TDK, C1005X7R1E223K
2 1 C4 CAP, CHIP, X5R, 10µF, ±10%, 50V, 1210 TAIYO-YUDEN, UMK325BJ106KM-T
3 1 C5 CAP, CHIP, X5R, 2.2µF, ±20%, 6.3V, 0402 MURATA, GRM155R60J225ME15D
4 1 L1 IND, SMT, 33µH, 420mΩ, ±20%, 0.80A, 4mm ×4mm COILCRAFT, LPS4018-333ML
5 1 R1 RES, CHIP, 787kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402787KFKED
6 1 R2 RES, CHIP, 121kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402121KFKED
7 1 R3 RES, CHIP, 261kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402261KFKED
8 1 R4 RES, CHIP, 324kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW0402324KFKED
9 1 R7 RES, CHIP, 3.01kΩ, ±1, 1/16W, 0402 VISHAY, CRCW04023K01FKED
Additional Demo Board Circuit Components
1 1 C6 CAP, CHIP, X5R, 4.7µF, ±20%, 6.3V, 0603 MURATA, GRM188R60J475KE19D
2 1 D1 DIODE, SCHOTTKY, 40V, 2A, PowerDI123 DIODES, DFLS240L
3 1 M1 MOSFET, P-Channel, –30V, –5.9A, 45mΩ, SOT-23 VISHAY, Si2343CDS
4 2 R5, R9 RES, CHIP, 10kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW040210K0FKED
5 1 R6 RES, CHIP, 2kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW04022K00JNED
6 2 R8, R10 RES, CHIP, 0Ω jumper, 1/16W, 0402 VISHAY, CRCW04020000Z0ED
7 1 R13 RES, CHIP, 47kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW040247K0JNED
8 1 R14 RES, CHIP, 5.1kΩ, ±1%, 1/16W, 0402 VISHAY, CRCW04025K10JNED
9 1 R15 RES, CHIP, 100kΩ, ±5%, 1/16W, 0402 VISHAY, CRCW0402100KJNED
10 1 R16 RES, CHIP, 464kΩ, ±1%, 1/10W, 0603 YAGEO, RC0603FR-07464KL
Hardware: For Demo Board Only
1 7 E1, E2, E3, E6, E7, E10, E11 TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0
2 4 E4, E5, E8, E9 TURRET, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0
3 0 J1-OPT CONN, 3 Pin Polarized HIROSE, DF3-3P-2DSA
4 4 JP1-JP4 HEADER, 3 Pin, SMT, 2mm SULLIN, NRPN031PAEN-RC
5 4 JP1-JP4 SHUNT, 2mm SAMTEC, 2SN-BK-G
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC1977A-A Bill of Materials
Required Circuit Components
1 0 R11 DO NOT INSTALL
2 1 R12 RES, CHIP, 0Ω jumper, 1/16W, 0402 VISHAY, CRCW04020000Z0E
3 1 U1 40V 400mA SYNCHRONOUS STEP-DOWN BATTERY
CHARGER, 3mm ×3mmQFN16
LINEAR TECH., LTC4121EUD-4.2#PBF
1 1 C1 CAP, CHIP, X5R, 47µF, ±10%, 16V, 1210 MURATA, GRM32ER61C476KE15L
2 0 C2 CAP, CHIP, X5R, 47µF, ±10%, 16V, 1210 MURATA, GRM32ER61C476KE15L
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC1977A-B Bill of Materials
Required Circuit Components
1 1 R11 RES, CHIP, 1.40MΩ, ±1%, 1/16W, 0402 VISHAY, CRCW04021M40FKE
2 1 R12 RES, CHIP, 1.05MΩ, ±1%, 1/16W, 0402 VISHAY, CRCW04021M05FKED
3 1 U1 40V, 400mA SYNCHRONOUS STEP-DOWN BATTERY
CHARGER, 3mm ×3mmQFN16
LINEAR TECH., LTC4121EUD#PB
1 2 C1, C2 CAP, CHIP, X5R, 47µF, ±10%, 16V, 1210 MURATA, GRM32ER61C476KE15L

7
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
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.
schematic Diagram
4 4
3 3
2 2
1 1
4 4 3 3 2 2 1 1
UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V
OPT
FREQ
EXT
1.5 MHz
NTC
INT
400mA
DISABLED
RUN
ENABLED
2.7V - 18V
750 kHz
*
R12
ASSY
1.40M 1.05M
0 OhmOPEN
R11
-B
-A
LTC4121EUD LTC4121EUD - 4.2
U1
4.4V - 40V
0.4A
OFF
MPPT
ON
R12 TO BE CONNECTED TO C2 & C3
BATTERY CHARGER
C1 C2
22µF/25V 22µF/25V
OPEN47µF/16V
**
INTVCC
INTVCC
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
-
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
-
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
-
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
DEMO CIRCUIT 1977A - A / B
11
40V 400mA SYNCHRONOUS STEP-DOWN
N/A
LTC4121EUD - 4.2 / LTC4121EUD
NC WAT
2017-02-22
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
DEMO CIRCUIT 1977A - A / B
11
40V 400mA SYNCHRONOUS STEP-DOWN
N/A
LTC4121EUD - 4.2 / LTC4121EUD
NC WAT
2017-02-22
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
DEMO CIRCUIT 1977A - A / B
11
40V 400mA SYNCHRONOUS STEP-DOWN
N/A
LTC4121EUD - 4.2 / LTC4121EUD
NC WAT
2017-02-22
JP2
JP4
E4
NTC
D1
DFLS240L
C2
C6
4.7uF 6.3V
0603
E6
GND
R13 47k 5%
R16
464k
0603
0 Ohm
JUMPER
R8
R11
*
0 Ohm
JUMPER R10
JP3
E1
PV+
E8 CHRG
R1
787k
R5 10.0k
R15
100k
5%
Q1
Si2343DS
R4 324k
E10
GND
E2
VIN +
J1
DF3-3P-2DSA
BAT
1
GND
2
ENTC
3
E9
FAULT
R7
3.01k
C1
U1
LTC4121EUD-4.2 / LTC4121EUD
INTVcc
1
BOOST
2
IN
3
sw
4
GND
5
MPPT
6
FREQ
7
CHGSNS
8
BAT
9
BATSNS/FB
10
NC/FBG
11
NTC
12
PROG
13
CHRG
14
FAULT
15
RUN
16
EPAD
17
R9
10.0k
R12
*
R2
121k
R6
2.0k
5%
C4 10uF
50V
1210
C3 0.022µF 25V
E3
PV- or Vin-
R14 5.1k 5%
E11
4.4V - 40V
VIN
L1 33.0uH
E5
PROG
C5 2.2uF
6.3V 20%
R3 261k
JP1
E7
BAT

8
dc1977afb
DEMO MANUAL
DC1977A-A/DC1977A-B
 LINEAR TECHNOLOGY CORPORATION 2014
LT 0817 REV B • PRINTED IN USA
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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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.
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