1
UG-1320 Rev 0
DEMO MANUAL DC2642A
DESCRIPTION
LTC4041
2.5A Supercapacitor
Backup Power Manager
Demonstration circuit 2642A shows the LTC4041 super-
capacitor backup power manager operating with either a
stack of two series supercapacitors (DC2642A-A) or a single
supercapacitor (DC2642A-B). The board demonstrates the
design of a 5V rail with a short-term power backup using
10F supercapacitors.
The input current limit, charge current limit, charge voltage,
power fail threshold, and boost voltage are all configurable
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
TYPICAL APPLICATION
through changing resistor values on the board. Test points
for all monitoring pins and LED indicators on status pins
are also available to assist in the evaluation.
Design files for this circuit board are available at
http://www.analog.com/DC2642A
Specifications are at TA = 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCIN Input Voltage Range VPF = 4.7V 4.7 5.5 V
DCINOV DCIN Overvoltage Limit 42 V
VBOOST Backup Boost Voltage R5 = 1.05MΩ, R2 = 200kΩ 5 5.5 V
VSYS System Voltage VIN > VPF (with Hysteresis)
VIN < VPF (with Hysteresis)
VIN
VBOOST
V
VPF Power Fail Threshold Voltage R1 = 113kΩ, R2 = 383kΩ 4.7 V
IIN Input Current Limit RS1 = 10mΩ 2.5 A
ISCAP Charge Current Limit RPROG = 1kΩ 2 2.5 A
200k
2.2µH
1.5M
342k
1nF
dc2642a F01
VSYS
CAPFB
BSTEN CAPSEL CPF PROGGNDCHGEN
SYSGD
CAPGD
IMON
IGATE
LTC4041
VIN CLN
1.05M
MN2
MN1 4.7V TO 5.5V
10mΩ
10F
10F
100µF
2.2µF
TO BACKED-UP
SYSTEM OUTPUT
BSTFB
RSTFB
4.7V TO 5.5V
DCIN
(PROTECTED TO 42V)
BAL
SCAP
SW
VSYS
OVSNS
PFI
38.3k
113k
6.2k
L1: COILCRAFT XAL-5030-222
MN1: VISHAY/SILICONIX SiS488DN
MN2: VISHAY/SILICONIX SiS488DN
PFO
CAPFLT
1k
2
UG-1320 Rev 0
DEMO MANUAL DC2642A
QUICK START PROCEDURE
Refer to Figure1 for the proper measurement equipment
setup and jumper settings. Please follow the procedure
below to familiarize yourself with the DC2642A.
1. Connect test equipment as shown in Figure1. Ensure
JP1 and JP2 are both in the ON position.
2. Enable PS1 and observe as the voltage on VM2 begins
to rise. The voltage on VM1 should be approximately
5V. The CAPGD LED will turn on to indicate that the
supercapacitor voltage is not yet in regulation.
3. Observe that the voltage on VM2 regulates at a default
4.5V on DC2642A-A or 2.4V on DC2642A-B. At this
point, the CAPGD LED will turn off.
4. Enable LD1, then disable PS1 and observe that the
voltage on VM1 remains regulated at 5V. The voltage
on VM2 will begin to fall.
5. Observe that the PFO and CAPGD LEDs turn on to
indicate that the DCIN voltage has fallen below the 4.7V
power fail threshold and the supercapacitor voltage
has fallen out of regulation.
6. Eventually, the supercapacitor voltage will fall enough
that the VM1 voltage will fall out of regulation. As VM1
falls past ~4.625V, the SYSGD LED will turn on briefly
before VM1 falls out of regulation.
Figure1. Quick Start Procedure Setup for DC2642A
3
UG-1320 Rev 0
DEMO MANUAL DC2642A
DEMO BOARD OPERATION
DCIN Voltage Drops
Because the LTC4041’s power fail function monitors
the input voltage to determine its operation mode, it
is important to use low-impedance connections to the
demo board. Poor quality or lengthy wiring to DCIN can
result in a substantial voltage drop across the wires as
the DC2642A passes power to the load or charges the
supercapacitor(s), leading to undesired triggering of the
power fail threshold, 4.7V default.
Short, high-conductivity wires with a good connection are
desirable and will mitigate this issue. As a workaround,
the power fail threshold can be lowered or a higher volt-
age can be output from the power source to account for
these drops, but this should not exceed the 5.5V rating
of the DC2642A.
Number of Supercapacitors
The LTC4041 can support either one or two supercapaci-
tors. For safety reasons, DC2642A is broken into two vari-
ants: DC2642A-A has two supercapacitors and balancing
enabled, while DC2642A-B has one supercapacitor and
has no need for balancing.
The LTC4041 uses the CAPSEL pin to determine whether
one or two supercapacitors are present and whether
balancing should be enabled. The charger also features
supercapacitor over-voltage protection, and the voltage
limits are based on the number of supercapacitors present
as indicated by CAPSEL.
As a result, it is imperative that CAPSEL is configured to
correctly reflect the number of series supercapacitors in
the system. Resistor jumpers (R19 & R20) on the back
of the DC2642A allow the CAPSEL state to be configured
according to Table1.
Table1. Configuring Supercapacitor Count
Supercapacitor
Configuration
Populated
Footprint(s)
Populated CAPSEL
Resistor
Dual (Series) SCAP1 & SCAP2 R19
Single SCAP3 R20
Evaluating Power Consumption
When evaluating the power consumption of the LTC4041
using the demo board, it is recommended that SW1 is
placed in the EXTVDD position to disable the LEDs or
power them externally.
Discharging Supercapacitors
Throughout the course of evaluation, it may become nec-
essary to discharge the supercapacitors. If possible, it is
recommended that an electronic load is used to discharge
slowly and safely.
Directly shorting the supercapacitors will not damage
them, but can result in sparks and damage to the conduc-
tor causing the short.
Removing Supercapacitors
The onboard supercapacitors can be moved into single-
supercapacitor or dual-supercapacitor (series) configura-
tion, or can be replaced with a user’s own supercapacitor
models. It is recommended that supercapacitors are
discharged sufficiently before being removed.
CHGEN and BSTEN Diodes: D4
D4 is used to diode-OR the voltages on VSYS and SCAP
to create a logic-high voltage for the CHGEN and BSTEN
pins that will be available in situations where VSYS is not
present. This is necessary to disable the boost function
(BSTEN tied high), and it is also necessary to enter shut-
down mode (CHGEN and BSTEN tied high). In applications
where CHGEN and BSTEN are always tied to ground, the
diode-OR is not needed.
4
UG-1320 Rev 0
DEMO MANUAL DC2642A
DEMO BOARD OPERATION
Optional Components: R7 & R8
By default, the RSTFB input is fed the same voltage as
the BSTFB input. The 0.74V threshold of the RSTFB pin is
92.5% of the 0.8V BSTFB servo voltage. As a result, tying
both pins to the same voltage divider causes the SYSGD
pin to pull low when the VSYS voltage drops below 92.5%
of the programmed backup boost voltage.
If a different threshold is desired, R4 can be removed to
detach the dividers from each other, and R7 & R8 can be
installed with values to set a custom SYSGD indication
threshold.
Backup Time
The amount of time that the supercapacitor can back up the
system is influenced by many factors. The most prevalent
are the supercapacitor voltage, the system boost voltage,
and the system load current.
However, other factors such as supercapacitor leakage and
ESR can also play a significant role under some circum-
stances. An equation for estimating backup time is given
in the LTC4041 data sheet, but it is still necessary to test
operation with given values and components.
The backup time decreases as the load current increases,
as expected. However, the decline in backup time is ac-
celerated due to several of the aforementioned factors.
When using a single supercapacitor, the lower voltage limit
of the supercapacitor and the fixed boost converter switch
current of the LTC4041 will result in a shorter backup time
when compared to two supercapacitors stacked in series.
Switch Current Limit
At higher load currents with lower supercapacitor volt-
ages, the LTC4041 will need to limit the supercapacitor’s
discharge current as to not exceed the current limit of its
internal boost switch. This protects the IC, but VSYS will
begin to collapse when the switch current limit is reached
due to power-limiting.
Equivalent Series Resistance (ESR)
All supercapacitors have ESR which dissipates power and
causes a voltage drop when they are being discharged.
At lower supercapacitor voltages, the switch limit will be
reached sooner, causing a faster collapse of VSYS. For this
reason, it is beneficial to select supercapacitors with low
ESR. The 10F supercapacitors used on the DC2642A have
a typical ESR of 20mΩ.
Figure2. Measured Backup Time for Single/Dual
10F Supercapacitors (Boost to 5V)
5
UG-1320 Rev 0
DEMO MANUAL DC2642A
Figure3. SCAP Voltage at VSYS Dropout for
Single/Dual 10F Supercapacitors (Boost to 5V)
DUAL SERIES: 5F, 40mΩ
SINGLE: 10F, 20mΩ
In Figure3, it can be observed that the dropout voltage for
dual supercapacitors (in series) is greater than the dropout
voltage for a single supercapacitor. This is because the
ESR is greater for series-connected capacitors.
Figure3 shows the voltage of the supercapacitor(s) at
different VSYS loads after VSYS has dropped out, charg-
ing has terminated, and the supercapacitor voltage has
relaxed. Charging terminates at the same voltage for both
supercapacitors as seen by the LTC4041; however, the
voltage drop across the ESR causes the supercapacitor
voltages to appear lower when being discharged. As the
current draw from the supercapacitors stops, the voltage
across the ESR approaches 0V, and the supercapacitors
relax to a voltage unaffected by ESR. A higher voltage after
the supercapacitor relaxes indicates that more energy was
unused when discharging.
DEMO BOARD OPERATION
Figure4. Energy Loss Due to ESR at Various
VSYS Loads (Single 10F, Boost to 5V)
Figure4 shows the measured losses due to ESR for a
single 10F supercapacitor configuration. The total ESR
losses are a combination of the resistive loss from the
ESR and the energy unused as a result of early termina-
tion due to the ESR.
The amount of energy loss is particularly high for the
single-supercapacitor case at higher load currents. This is
due to the low starting voltage which gives little headroom
to avoid the switch current limit.
Supercapacitor Leakage
Internal leakage in a supercapacitor is comprised of dif-
fusion current and steady-state leakage current. Diffusion
current decreases as the supercapacitor is held at a voltage.
Manufacturers typically spec leakage at a certain time after
the supercapacitor has been charged.
6
UG-1320 Rev 0
DEMO MANUAL DC2642A
The 10F supercapacitors on the DC2642A have a specified
leakage current of 0.023mA after 72 hours of being held
at the rated charge voltage. Near the start of charging,
though, the leakage current is significantly higher.
Supercapacitor leakage is primarily a concern for backing
up loads for a longer time. To test operation with worst-
case leakage current, charge a supercapacitor and trigger
a power-fail immediately after the supercapacitor reaches
its full charge voltage.
Figure5 shows the self-discharge of the supercapacitor
triggering a recharge cycle. Note that the recharge cycles
become less frequent as the supercapacitor remains near
full charge.
Keeping these factors in mind, the LTC4041 can be used
to design a robust 5V backup system using either a single
supercapacitor or two supercapacitors in series. Given
the effects of the switch current limit and the ESR of the
supercapacitor model, using two supercapacitors in series
is generally preferable when operating at higher load cur-
rents. However, designs with lower load currents can save
space and lower costs by using a single supercapacitor.
DEMO BOARD OPERATION
Figure5. Supercapacitor Recharge Rate Due
to Self-Discharge (Dual 10F, Unloaded)
7
UG-1320 Rev 0
DEMO MANUAL DC2642A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., 0.1µF, X7R, 50V, 10%, 0805 AVX 08055C104KAT2A
2 1 C2 CAP., 10µF, X5R, 50V, 10%, 1206 MURATA GRM31CR61H106KA12L
3 1 C3 68µF ±20% 50V Aluminum Polymer Capacitor Radial,
Can - SMD 20mΩ
Panasonic Electronic Components 50SVPF68M
4 1 C5 CAP., 2.2µF, X5R, 10V, 10%, 0603, NO SUBS. ALLOWED MURATA GRM188R61A225KE34D
5 3 C6, C11, C14 CAP., 0.1µF, X7R, 10V, 10%, 0402 MURATA GRM155R71A104KA01D
6 2 C8, C9 CAP., 100pF, C0G, 100V, 5%, 0805 AVX 08051A101JAT2A
7 1 C12 CAP., 10µF, X5R, 10V, 20%, 0603 AVX 0603ZD106MAT2A
8 1 C13 CAP., 1000pF, X7R, 16V, 10%, 0402 AVX 0402YC102KAT2A
9 1 D4 DIODE ARRAY SCHOTTKY 40V SOT23 Diodes Incorporated BAS40-05-7-F
10 1 L1 IND., 2.2µH, PWR, 20%, 9.2A, 14.5mΩ, 5.48mm × 5.28mm,
XAL5030,AEC-Q200
COILCRAFT XAL5030-222MEB
11 2 M1, M2 MOSFET N-CH 40V 40A 1212-8 Vishay Siliconix SIS488DN-T1-GE3
12 1 R1 RES., 113kΩ, 1%, 1/10W, 0402 PANASONIC ERJ2RKF1133X
13 1 R2 RES SMD, 38.3KΩ, 1%, 1/16W, 0402 Vishay Dale CRCW040238K3FKED
14 1 R3 RES SMD, 6.2KΩ, 5%, 1/4W, 0603 Rohm Semiconductor ESR03EZPJ622
15 1 R4 RES., 0Ω, 1/16W, 0402 ROHM MCR01MZPJ000
16 1 R5 RES., AEC-Q200, 1.05MΩ, 1%, 1/16W, 0402 VISHAY CRCW04021M05FKED
17 1 R6 RES., 200kΩ, 1%, 1/16W, 0402 PANASONIC ERJ2RKF2003X
18 1 R11 RES., 1kΩ, 1%, 1/10W, 0603 NIC NRC06F1001TRF
19 3 R14, R18, R21 RES., 1MΩ, 1%, 1/16W, 0402 Vishay Dale CRCW04021M00FKED
20 3 R15-R17 RES., 1.5kΩ, 1%, 1/16W, 0402 NIC NRC04F1501TRF
21 1 RS1 RES., SENSE, 0.01Ω, 1%, 1/3W, 0603 SUSUMU PRL0816-R010-F-T1
22 1 U1 IC,2.5A Supercap Backup Power Manager LINEAR TECHNOLOGY LTC4041EUFD#TRPBF
Additional Demo Board Circuit Components
23 0 C4, C7, C10 CAP., OPTION, 0402
24 0 R7,R8 RES., OPTION, 0402
25 0 R12, R13 RES., OPTION, 0603
Hardware: For Demo Board Only
26 2 D1, D2 LED,SUPER YELLOW, MILKY WHITE DIFF., 0603 SMD LUMEX SML-LX0603SYW-TR
27 1 D3 LED, RED, WATER CLEAR, 0603 LITE-ON TECHNOLOGY CORP LTST-C193KRKT-5A
28 19 E1-E19 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX 2501-2-00-80-00-00-07-0
29 4 E20-E23 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,
SWAGE
KEYSTONE 575-4
30 2 JP1, JP2 CONN., HDR, MALE, 1 × 3, 2mm, THT, STR, NO SUBS.
ALLOWED
Wurth Elektronik 62000311121
31 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY THT-96-717-10
32 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.625" KEYSTONE 8834
33 1 SW1 SWITCH SLIDE DPDT 300MA 6V C&K JS202011CQN
34 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm Wurth Elektronik 60800213421
8
UG-1320 Rev 0
DEMO MANUAL DC2642A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC2642A-A Required Circuit Components
35 1 R9 RES., AEC-Q200, 1.5MΩ, 1%, 1/16W, 0402 Vishay Dale CRCW04021M50FKED
36 1 R10 RES., 324kΩ, 1%, 1/16W, 0402 NIC NRC04F3243TRF
37 1 R19 RES., 0Ω, 1/10W, 0603 YAGEO RC0603FR-070RL
38 0 R20 RES., OPTION, 0603 -
39 2 SCAP1, SCAP2 CAP., 10F, ULTRA, 2.7V, –10/+20%, THT, RADIAL NESSCAP CO. LTD. ESHSR-0010C0-002R7
40 0 SCAP3 CAP., 10F, ULTRA, 2.7V, –10/+20%, THT, RADIAL NESSCAP CO. LTD. ESHSR-0010C0-002R7
DC2642A-B Required Circuit Components
41 1 R9 RES., 698kΩ, 1%, 1/16W, 0402 Vishay Dale CRCW0402698KFKED
42 1 R10 RES., 348kΩ, 1%, 1/16W, 0402 KOA SPEER RK73H1ETTP3483F
43 0 R19 RES., OPTION, 0603
44 1 R20 RES., 0Ω, 1/10W, 0603 YAGEO RC0603FR-070RL
45 0 SCAP1, SCAP2 CAP., 10F, ULTRA, 2.7V, –10/+20%,T HT, RADIAL NESSCAP CO. LTD. ESHSR-0010C0-002R7
46 1 SCAP3 CAP., 10F, ULTRA, 2.7V, –10/+20%, THT, RADIAL NESSCAP CO. LTD. ESHSR-0010C0-002R7
9
UG-1320 Rev 0
DEMO MANUAL DC2642A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
NOTES: UNLESS OTHERWISE SPECIFIED
1. RESISTORS: OHMS, 0402, 1%, 1/16W
2. CAPACITORS: 0402, 10%, 50V
PCA ADDITIONAL PARTS
DCIN
GND
50V
0805 50V
GND
VSYS
50V
1206
50SVPF68M
0603
10V
0402
10V 10V
1210 1210
GND
SCAP **
BAL
PROG
BSTEN
CHGEN
IMON
CAPFLT
CAPGD
PFO
SYSGD
OFF
ON
ENBST
OFF
ON
ENCHG
GND
GND
GND
0402 0603
0603
4.7V-5.5V
PF THRESH = 4.7V
4.7V-5.5V 2.5A
BSTFB SETTING = 5V
0402
EXTVDD
0
1
0
1SW1 POSITIONS
0: VSYS - LEDS POWERED BY VSYS
1: EXTVDD - LEDS POWERED BY EXTVDD IF PRESENT
LED PWR
TO CONTROL CHGEN OR BSTEN FROM AN
EXTERNAL MICROCONROLLER, REMOVE THE
JUMPER FROM JP1 OR JP2, RESPECTIVELY.
DO NOT CHANGE JP1 OR JP2 POSITIONS
DURING OPERATION UNLESS R12 OR R13
ARE INSTALLED, RESPECTIVELY.
CHARGE
CURRENT
SETTING = 2A
0603
ONLY ONE OF R19 & R20 SHOULD BE
INSTALLED AT ANY TIME.
INSTALLED
SUPERCAPS
INSTALLED
RESISTOR
SCAP1 & SCAP2
CAUTION: IF SCAP3 IS INSTALLED WHILE R19
IS INSTALLED, THE SUPERCAPACITOR IS NOT
PROTECTED FROM OVERVOLTAGE AND CAN
BE DANGEROUS
SCAP3
R19
R20
R19 R20SKU NO.
DC2642A- A
SCAP1 SCAP2 SCAP3
LOADED LOADED DNP LOADED DNP
DNP DNP LOADED DNP LOADED
*ASSEMBLY VERSION TABLE
*
R10
324k
348k
SEE ASSY TABLE
DC2642A- B
NUMBER OF
SUPERCAPS
TWO
ONE
DCIN PROTECTED UP TO 42V
DEMO CIRCUIT
DC2642A-A
SCAP DEFAULT
4.5V
2.4VDC2642A-B
4V-5.5V
RSTFB FALLING THRESH = 4.625V
RSTFB RISING THRESH = 4.75V
2A
**
*
*
*
*
*
R9
1.5M
698k
*
ECO REV DESCRIPTION APPROVED
PRODUCTION
DATE
01-18-18
ZP
-4
REVISION HISTORY
VSYS VSYS
VSYS
SCAP
SCAPVSYS
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
NC
ZP
LTC4041
2.5A SUPERCAPACITOR BACKUP POWER MANAGER
700-DC2642A_REV04
710-DC2642A_REV04
705-DC2642A_REV04
N/A
01-18-18
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
NC
ZP
LTC4041
2.5A SUPERCAPACITOR BACKUP POWER MANAGER
700-DC2642A_REV04
710-DC2642A_REV04
705-DC2642A_REV04
N/A
01-18-18
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES.
APP ENG.
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
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM:
PCA ASS'Y:
TM
DEVICES
Milpitas, CA 95035
Fax: (408)434-0507
www.analog.com
Phone: (408)432-1900
ANALOG
1630 McCarthy Blvd.
AHEAD OF WHAT'S POSSIBLE
11
NC
ZP
LTC4041
2.5A SUPERCAPACITOR BACKUP POWER MANAGER
700-DC2642A_REV04
710-DC2642A_REV04
705-DC2642A_REV04
N/A
01-18-18
R20
0
R17
1.5k
E20
C6
0.1uF
C4
OPT
D2
SUPER YELLOW
R1
113k
R15
1.5k
C1
0.1uF
+
SCAP1
10F
E13
R8
OPT
C9
100uF
D1
SUPER YELLOW
MP2
STANDOFF,NYLON,SNAP-ON,0.625"
E22
R18 1M
RS1
0.01
E18
MP4
STANDOFF,NYLON,SNAP-ON,0.625"
LB1 LABEL
C2
10uF
E9
PCB1
PCB, DC2642A REV04
+
SCAP2
10F
E14
C14
0.1uF
R5
1.05M
E2
R9
R12
OPT
R19
0
U1
LTC4041-UFD
PFI
19
SYSGD
11
PFO
14
CAPGD
13
CAPFLT
8
IMON
3
CHGEN
4
BSTEN
5
PROG
2
25
GND
20
CAPSEL
CPF
17
BAL
9
CAPFB 12
SCAP 23
SW 21
SW 22
RSTFB 10
BSTFB 18
VSYS 1
VSYS 24
IGATE 15
CLN 7
VIN 6
OVSNS 16
E19
E21
C11
0.1uF
D4
BAS40-05-7-F
32
1
STNCL1
TOOL, STENCIL, 700-DC2642A REV04
E6
C7
OPT
R3
6.2k
C13
1000pF
R14
1M
M2
SIS488DN-T1-GE3
E8
E11
C12
10uF
R7
OPT
R6
200k
E7
E4
E23
C5
2.2uF
JP1
1 3
2
E17
R2
38.3k
SW1
DPDT
MP1
STANDOFF,NYLON,SNAP-ON,0.625"
C8
100uF
E1
MP3
STANDOFF,NYLON,SNAP-ON,0.625"
E12
R11
1k
R13
OPT
E16
L1
2.2uH
D3
RED
C10 OPT
+
C3
68uF
M1
SIS488DN-T1-GE3
R4
0
JP2
1 3
2
R16
1.5k
E15
+
SCAP3
10F
R10
R21 1M
E5
E3
E10
10
UG-1320 Rev 0
DEMO MANUAL DC2642A
ANALOG DEVICES, INC. 2018
UG16908-0-7/18(0)
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation
Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)
and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to
Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted
is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third
Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is
NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
