Linear Technology DC2043B Quick setup guide

1
dc2043bfa
DEMO MANUAL DC2043B
Description
LTC3305EFE
Lead Acid Battery Balancer
Demonstration circuit 2043B is alead-acid battery balancer
featuring the LT C
®
3305. The LTC3305 balances up to four
lead-acid batteriesconnected in seriesand incorporates all
voltage monitoring, gate drive and fault detection circuitry.
The LTC3305 employs an auxiliary battery or an alternative
storage means to transfer charge to orfrom each individual
battery within the stack. There are two operating modes,
TIMER mode and CONTINUOUS mode, selected by the
MODE pin. In TIMER mode, once the balancing operation
is complete, the LTC3305 goes to a low power state for
a programmed time and then periodically rebalances 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.
BoarD photo
batteries. In CONTINUOUS mode, the balancing operation
continues even after the batteries are balanced to their
programmed termination voltage.
The LTC3305EFE is available in a 7mm ×7mm 38-lead
TSSOP surface mount package with exposed pad.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2043B
Figure 1. DC2043B Demo Board Figure 2. Thermal Image of DC2043B

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dc2043bfa
DEMO MANUAL DC2043B
operatinG principLe
Refer to the block diagram within the LTC3305 data sheet
for its operating principle.
The LTC3305 balances batteries using an auxiliary battery
or an alternate storage means as a charge reservoir. The
LTC3305 controls external N Channel MOSFET switches
in a preprogrammed sequence to connect a battery in
the stack to the auxiliary battery. Charge is transferred
to or from the auxiliary battery when it is connected to a
battery in the stack.
The LTC3305 can operate in one of two modes, TIMER
mode or CONTINUOUS mode, programmable via the
MODE pin. Balancing operation begins once the CBOOST
capacitor is charged to at least 6.95V. The EN1 and EN2
pins select the number of batteries in the stack.
EN1 EN2 Application
0 0 SHUTDOWN
0 1 2 Battery Stack
1 0 3 Battery Stack
1 1 4 Battery Stack
With the MODE pin set to 0 the LTC3305 will operate in
the TIMER Mode. The BAL pin will be pulled low, indicating
that the part is enabled and balancing the battery stack.
The balancing operation begins with the terminal of the
auxiliary battery connectedto thenegative terminalof BAT1,
the lowest battery in the stack. The bottom switches that
connect the negative terminals of BAT1 to the auxiliary
battery's negative terminal are turned on. After a 50ms
delay, the voltages across the auxiliary battery and BAT1
are compared by the termination sense comparator. If the
voltage difference between the auxiliary battery and BAT1
is less than the selected termination voltage, the battery
is deemed to be in a balance state with respect to the
auxiliary battery. The bottom switches will be turned off
and the next battery within the stack will be connected.
If the voltage difference between the auxiliary battery and
BAT1 is greater than the selected termination voltage, the
top switches that connect the positive terminal of BAT1
to the auxiliary battery’s positive terminals through the
PTC thermistor are turned on. Current is limited by the
PTC thermistor. Figure 3 shows the startup battery current
where the PTC is limiting as it heats up. Figure 4 is the
steady state battery current after the PTC has reached its
thermal equilibrium. After a 50ms delay, the termination-
sense comparator starts to monitor the voltage across the
auxiliary battery and the battery. The battery will remain
connected to the auxiliary battery until the voltage differ-
ence decreases to the selected termination voltage or a
tBAT timeout occurs.
At this point all switches are turned off and the second
battery in the stack will be connected to the auxiliary bat-
tery after a 50ms delay. This 50ms delay provides a break-
before-make function before the next battery is connected.
The cycle will be repeated for each battery in the stack.
Once all batteries in the stack are balanced the DONE pin is
pulled low, the BAL pin is in its high state and the LTC3305
is put into a low power off state. The stack is deemed bal-
anced when for a four battery stack, the termination-sense
comparator detects VTERMINATE on five consecutive cycles
that connect each of the batteries to the auxiliary battery
using the bottom switches only.
performance summary
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN MAX UNITS
VBAT Battery Voltage Range 4.0 to 16.0 V
VTERMINATE Termination Voltage Range TERM2 = 0, TERM1 = 0 ±5 to ±20 mV
VTERMINATE Termination Voltage Range TERM2 = 0, TERM1 = 1 ±17.5 to ±32.5 mV
VTERMINATE Termination Voltage Range TERM2 = 1, TERM1 = 0 ±42.5 to ±57.5 mV
VTERMINATE Termination Voltage Range TERM2 = 1, TERM1 = 1 ±90 to ±110 mV
VREG Regulator Output Voltage Range IVREG = 200µA 2.4 to 2.6 V

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dc2043bfa
DEMO MANUAL DC2043B
operatinG principLe
2.0s/DIV
BATX
5.00V/DIV
BATY
5.00V/DIV
AUX BATTERY
CURRENT
200mA/DIV
dc2043 F03
2.0s/DIV
BATX
5.00V/DIV
BATY
5.00V/DIV
AUX BATTERY
CURRENT
200mA/DIV
dc2043 F04
Figure 3. Start-Up Battery Balancing Current
Figure 4. Steady State Battery Balancing Current
In TIMER mode, the balancing operation continues for a
maximum of the programmed tON time. After the tON time,
LTC3305is put into a low power off state for a programmed
tOFF time, even though the batteries may not be balanced.
Once the tOFF time expires, the LTC3305 is put into the
ON state, and normal operation resumes. The BAL pin is
in its high impedance state if the part is in the OFF state
or when the part is in shutdown.
With the MODE pin set to 1, the LTC3305 will operate in the
CONTINUOUS Mode. The part functions in much the same
way as in the TIMER mode with the following differences.
1. There are no ON or OFF states. The balancing operation
continues even if the stack is in balance. The balanc-
ing operation is terminated only if the part is put into
shutdown. The BAL pin is always pulled low.
2. In CONTINUOUS mode, the top switches are turned
on and balancing operation on a battery is terminated
by the tBAT time out. Since the auxiliary cell remains
connected to the battery until a tBAT time out, its volt-
age can change before it connects to the next battery
in the stack. As a result, when the stack is balanced
and the DONE pin is pulled low, the voltages across
individual batteries in the stack may differ by more than
the programmed VTERMINATE. In the worst case, when
the capacity of the auxiliary cell is much smaller than
the battery, the individual battery voltages will differ by
twice the programmed VTERMINATE when balanced.
The LTC3305 provides undervoltage and overvoltage
threshold detection that can be programmed using
resistors that are connected between the ISET, VL and
VH pins and ground. The voltages set on VL and VH are
scaled by a factor of 10, setting the battery undervoltage
and overvoltage thresholds, respectively.
When an undervoltage or overvoltage fault condition is
detected, the corresponding UVFLT or OVFLT pin is pulled
low. The balancing operation is not interrupted during this
time. If the fault condition goes away during balancing, the
correspondingfault pinisput intoits highimpedancestate.
A number of components are included on the DC2043B
to protect the circuit from damage when hot-plugging the
battery connections to the board.
Clamping diode D100 prevents the BOOST pin on the
LTC3305 from going excessively negative with respect
to the V4 pin during hot plug. Likewise, D101 prevents
the voltage at the CP pin from going excessively negative
with respect to the CP pin.
Antiparallel Schottky diodes and a 100Ω resistor tie each
power connection with its corresponding sense (Kelvin)
connection. The resistor keeps the potential between the
power and sense connections near zero while the diodes
maintain the voltage difference to a few tenths of a volt
even when transient currents want to flow between power
and sense connections.

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dc2043bfa
DEMO MANUAL DC2043B
QuicK start proceDure
Using short twisted pair leads for any power connections,
with all loads and power supplies off, refer to Figure 5 for
the proper measurement and equipment setup.
Follow the procedure below:
1. Before connectingPS1-PS5tothe DC2043B, thepower
supplies must have its current limit set to 5A . For
most power supplies with a current-limit-adjustment
feature the procedure to set the current limit is as
follows. Turn the voltage and current adjustment to
minimum. Short the output terminals and turn the
voltage adjustment to maximum. Adjust the current
limit to 5A for PS1. Turn the voltage adjustment to
minimum and remove the short between the output
terminals. Repeat for PS2-PS5 The power supplies
are now current limited to 5A .
a. Initial Jumper and PS settings:
JP1(MODE) = CONT JP2 (EN) = SD
JP3(TERM1) = 1 JP4 (TERM2) = 1
PS1 = Off PS2 = Off PS3 = OFF
PS4 = Off PS5 = Off PS6 = Off
2. Connect power supplies, load resistors and me-
ters as shown in Figure 5. Turn on PS1 and slowly
increase voltage to 2.0V while monitoring the input
current. If the current remains less than 200mA,
increase PS1 to 12.0V. Repeat for PS2-PS4.
3. Turn on PS5 and slowly increase voltage to 2.0V while
monitoring the inputcurrent. If thecurrent remains less
than 200mA, increase PS5 to 11.8V. Turn on PS6 and
slowly increase voltage to 2.0V while monitoring the
input current. If the current remains less than 20mA,
increase PS6 to 5.0V.
4. Measure the voltage from the VREG turret to ground.
The voltage should read approximately 2.6V. Measure
the voltage from the BOOST test point to V4. The volt-
age should read approximately 0V. No LED should be
on.
5. Set JP2 to EN. Measure the voltage from the BOOST
testpoint toV4. The voltage should read approximately
8.5V.
6. Measure the voltage from the ISET test point to ground.
The voltage should read approximately 1.2V.
During some hot-plug events, the gate-to-source voltage
on some of the power FETs can approach the maximum
VGS rating of the FETs. Back-to-back Zener diodes (15V
nominal threshold) are included across all power-FET
gate-source pins.
Inrush current between the sense connections and capaci-
torsC6, C12–C15islimited byresistorsR107–R111. These
resistors are pulse-power-rated. The higher pulse-power
capability is a necessary requirement for these resistors.
These resistors are 5Ω, 1206 except for the resistor in
the BAT4_KF net which is 2Ω, 1206 because, while it
senses the voltage at the top of the battery stack, it also
sinks a small amount of current to power the internals of
the LTC3305.
TVS diodes D135 to D138 are listed as “OPT”on the sche-
matic, and are not included on the DC2043B. However, a
transient-voltage-suppressor diode is included across
the battery stack to protect the LTC3305 from transients
generated during hot plugging. The threshold voltage of
the part is specified to lie between 66.7V and 73.7V.
Fuses are present on each of the 14 connections to external
batteries. Seven power connections employ a 7A-rated
fuse. The sense connections (XXX_K) use 1A fuses. Note
that the protection circuits described above are placed on
the internal-to-the-board side of the fuses. This placement
ensures isolation and disconnection of the protection
circuits in the event of a steady-state fault condition.
operatinG principLe

5
dc2043bfa
DEMO MANUAL DC2043B
QuicK start proceDure
7. Measure the voltage from the VH test point to ground.
The voltage should read approximately 1.52V.
8. Measure the voltage from the VL test point to ground.
The voltage should read approximately 0.95V.
9. With JP1 set to CONT, JP2 set to EN, JP3 set to 1 and
JP4 set to 1, observe that the BATX and BATY LEDs
are cycling through their four states.
BATX
LED
BATY
LED
Active
Battery
OFF OFF BAT1
OFF ON BAT2
ON ON BAT3
ON OFF BAT4
10. Decrease PS1 and PS5 to 9.4V and observe that while
the BATX and BATY are off, the UVFLT LED is on.
11. Increase PS1 and PS5 to 15.9V and observe that
while the BATX and BATY are off, the OVFLT LED is
on. Decrease PS1 and PS2 to 12.0V.
12. Decrease PS2 to 11.5V. Set JP1 to TIMER. Observe
that the BATX LED is off and BATY LED is on the ma-
jority of the time. Increase PS2 to 12V and observe
that the balancing action stops. The BAL LED will be
off and the DONE LED will be on.
13. Set JP1 to CONT and JP2 to SD. Set PS5 to 11.8V.
Observe that balancing action has stopped and no
LEDs are on. Set JP2 to EN and observe that balancing
action starts.
14. Turn off all power supplies.
10Ω
25W
PS5
+
PS4
+
PS3
+
PS2
+
PS1
+
10Ω
25W
10Ω
25W
10Ω
25W
5Ω
50W
PS6
+
Figure 5. Proper Measurement Equipment Set-Up

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dc2043bfa
DEMO MANUAL DC2043B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 5 C1-C4, C11 CAP., 4.7µF, X7R, 25V, 10%, 0805 MURATA, GRM21BR71E475KA73L
2 7 C5, C6, C12-C16 CAP., 10µF, X7R, 25V, 20%, 1206 TDK, C3216X7R1E106M160AB
3 1 C7 CAP., 0.033µF, C0G, 50V, 5%, 0805, AUTOMOTIVE TDK, CGA4J2C0G1H333J125AA
4 2 C8, C9 CAP., 0.01µF, C0G, 50V, 5%, 0805, AUTOMOTIVE TDK, CGA4C2C0G1H103J060AA
5 1 C17 CAP., 1µF, X7R, 16V, 10%, 0603 KEMET, C0603C105K4RAC7867
6 2 D1, D2 DIODE, SCHOTTKY, 100V, 1A, SOD-123F CENTRAL SEMI, CMMSH1-100G TR LEAD FREE
7 3 D3, D6, D7 LED, RED, CLEAR, 0603 SMD LITE-ON TECHNOLOGY CORP, LTST-C193KRKT-5A
8 4 D4, D5, D8, D9 LED, GREEN, CLEAR, 0603 SMD LITE-ON TECHNOLOGY CORP, LTST-C193KGKT-5A
9 16 D100-D115 DIODE, SCHOTTKY, 20V, 1A, SOD-123F CENTRAL SEMI, CMMSH1-20G TR LEAD FREE
10 18 D116-D133 DIODE, ZENER, 15V, 250mW, SOD-323 CENTRAL SEMI, CMDZ5245B TR LEAD FREE
11 1 D134 DIODE, TVS, 60V, 400W, SMA DIODES INC., SMAJ60A-13-F
12 7 F1, F3, F5, F7, F9, F11, F13 FUSE, BOARD MNT, 1A, 32VAC, 63VDC, 1206 Eaton, TR/3216FF1-R
13 7 F2, F4, F6, F8, F10, F12, F14 FUSE, BOARD MNT, 7A, 32VAC/VDC, 1206 Eaton, TR/3216FF7-R
14 1 Q1 XSTR., MOSFET, P-CH, 20V, 0.95A, SOT-23 CENTRAL SEMI, CMPDM8120 PBFREE
15 10 Q2-Q11 XSTR., MOSFET, N-CH, 100V, 60A, PPAK SO-8 VISHAY, SIR882DP-T1-GE3
16 8 R1, R2, R4-R9 RES., 6.04kΩ, 1%, 1/16W, 0402 VISHAY, CRCW04026K04FKED
17 1 R3 RES., 3.01kΩ, 1%, 1/16W, 0402 VISHAY, CRCW04023K01FKED
18 2 R10, R11 RES., 12.1kΩ, 1%, 1/8W, 0805 VISHAY, CRCW080512K1FKEA
19 7 R12-R18 RES., 10Ω, 1%, 1/16W, 0402 VISHAY, CRCW040210R0FKED
20 2 R19, R34 RES., 665Ω, 1%, 1/2W, 1210 VISHAY, CRCW1210665RFKEA
21 1 R20 RES., 12.1kΩ, 1%, 1/16W, 0402 VISHAY, CRCW040212K1FKED
22 1 R21 RES., 46.4kΩ, 1%, 1/16W, 0402 VISHAY, CRCW040246K4FKED
23 1 R22 RES., 28.7kΩ, 1%, 1/16W, 0402 VISHAY, CRCW040228K7FKED
24 7 R23-R29 RES., 1kΩ, 1%, 1/16W, 0402 NIC, NRC04F1001TRF
25 4 R30-R33 RES., 1.82MΩ, 1%, 1/16W, 0402 NIC, NRC04F1824TRF
26 1 R35 RES., 249Ω, 1%, 1/4W, 1206 VISHAY, CRCW1206249RFKEA
27 1 R36 RES., 100kΩ, 1%, 1/16W, 0402 NIC, NRC04F1003TRF
28 7 R37-R43 RES., 2kΩ, 1%, 1/16W, 0402 NIC, NRC04F2001TRF
29 7 R100-R106 RES., 100Ω, 1%, 1/16W, 0402 KOA SPEER, RK73H1ETTP1000F
30 4 R107-R110 RES., PULSE PROOF, 4.99Ω, 1%, 1/2W, 1206 VISHAY, CRCW12064R99FKEAHP
31 1 R111 RES., PULSE PROOF, 2Ω, 1%, 1/2W, 1206 VISHAY, CRCW12062R00FKEAHP
32 1 RT1 RES., THERMISTOR PTC, AUTOMOTIVE, 0.15Ω,
20%, 2.3W, THT
MURATA, PTGLESARR15M1B51B0
33 1 U1 IC, LEAD-ACID BATTERY BALANCER, TSSOP-38 LINEAR TECHNOLOGY, LTC3305EFE#PBF

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dc2043bfa
DEMO MANUAL DC2043B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Optional Circuit Components
1 0 D135-D138 TVS DIODE 15VWM 24.4VC SMA DIODES INCORPORATED, SMAJ15A-13-F
Hardware: For Demo Board Only
1 7 E1-E7 TEST POINT, TURRET, 0.064" MTG. HOLE, 0.125"
THICK PCB
MILL-MAX, 2308-4-00-80-00-00-07-0
2 17 E8-E24 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
3 4 JP1-JP4 CONN., HDR., MALE, 1x3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121
4 2 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10
5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.250" KEYSTONE, 8831
6 1 PCB1 PCB, DC2043B EAGLE ELECTRONICS, INC, 600-DC2043B
7 4 XJP1-XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

8
dc2043bfa
DEMO MANUAL DC2043B
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
TERM1
TERM2 EN MODE
00SD TIMER
11EN CONT.
BOOST
BATX
BATY OVFLT
UVFLT
BAL
DONE
PTCFLT
3.3V - 5.5V
VEXT
VEXT_RTN
CTOFF
CTON
CTBAT
VL
VH
ISET
2.5V
VREG
ON
OFF
OFF OFF ON
0
0
0 1
1
11
TERM1 TERM2
0
± 12.5mV ± 25mV ±50mV
TERMINATION VOLTAGE
± 100mV
BATTERY BEING BALANCED
BATTERY 1 BATTERY 2 BATTERY 3 BATTERY 4
ON
OFF
ON
BATX LED
BATY LED
NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402, 1%, 1/16W. 3. INSTALL SHUNTS ON JUMPERS AS SHOWN. 2. ALL CAPACITORS ARE IN MICROFARADS, 0805, 20%, 25V.
BATY BATX PTCFLT DONE BAL UVFLT OVFLT
0805
CP
CM
0805
REVISION HISTORY
ECO REV DESCRIPTION APPROVED DATE
-1 PROTOTYPE
BAT4_KF
BAT2_KF BAT1_KF
GND_KF
NG9
NG8
NG7
NG6 NG5 NG4 NG3
NG2 NG1
AUXN_KF AUXP_KF
BAT4F
BAT3_KF
GND_KF DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
21
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
21
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
21
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
TP4
E5
R33
1.82M
E15
U1
LTC3305-FE
MODE
35
CP
37
CM
38
BOOST
1
V4
2
V3
3
AUXP
4
AUXN
5
V2
6
V1
7
NG1
8
NG2
9
NG3
10
NG4
11
NG5
12
NG6
13
NG7
14
NG8
15
NC
36
NG9
16
BATX
17
BATY
18
OVFLT
19
UVFLT
20
BAL
21
DONE
22
PTCFLT
23
CTBAT
26
CTON
25
CTOFF
24
VL
27
VH
28
ISET
29
VREG
30
TERM2
31
TERM1
32
EN2
33
EN1
34
GND
39
E6
R41
2k
C12 10uF 1206
E16
R42
2k
D7
RED
D8
GREEN
E7
R36
100k
C13
10uF 1206
D1
CMMSH1-100G
TP3
D101 CMMSH1-20G TR
R35
249
1206
TP18
C6
10uF 1206
D2
CMMSH1-100G
R19 665 1210
TP14
E1
R26 1k
C14 10uF 1206
TP17
TP15
R20
12.1k
C9
0.01uF 5%
50V
0805
TP2
C11
4.7uF
R34 665
1210
R37
2k
C5
10uF
1206
JP4
R28 1k
C17
1uF
0603
16V
E2
D100
CMMSH1-20G TR
C15
10uF 1206
R25 1k
R29
1k
D3
RED
R30
1.82M
R38
2k
C7 0.033uF
50V
5%
E3
TP1
JP1
C16
10uF
1206
Q1
CMPDM8120
R22
28.7k
R24 1k
R39
2k
D9
GREEN
TP16
R31
1.82M
C8
0.01uF 5%
50V
0805
D4
GREEN
JP2
R21
46.4k
R40
2k
R43
2k
D5
GREEN
E4
R27 1k
R32
1.82M
E17
R23 1k
D6 RED
JP3
VREG
GND_KF
BAL
VEXT
GND_KF

9
dc2043bfa
DEMO MANUAL DC2043B
schematic DiaGram
9.5V-15.5V
9.5V-15.5V9.5V-15.5V
9.5V-15.5V
9.5V-15.5V
AUXP_K
AUXN
BAT4
BAT4_K BAT3
BAT3_K
BAT2
BAT2_K
BAT1
BAT1_K
GND GND_K
AUXP
AUXN_K
PCA ADDITIONAL PARTS
0805
0805
0805
0805
NG7
NG5
NG4
NG3
NG2
NG1
NG9
NG8
NG6
1206
1206
1206
1206
1206
1A
1206
7A
1206
1206
7A
1A
1206
7A
1206
1A
1206
7A
1206
1A
1206
7A
1206
1A
1206
7A
1206
1A
1206
7A
1206
1A
1206
15V
15V 15V
15V
1. ALL RESISTORS ARE IN OHMS, 0402, 1%, 1/16W. 3. INSTALL SHUNTS ON JUMPERS AS SHOWN. NOTES: UNLESS OTHERWISE SPECIFIED 2. ALL CAPACITORS ARE IN MICROFARADS, 0805, 20%, 25V.
AUXN_KF
NG9
NG8
NG7
NG6
NG5
NG4
NG3
NG2
NG1
GND_KF
BAT1_KF
BAT2_KF
BAT3_KF
BAT4_KF
BAT4F
AUXP_KF
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
22
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
22
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
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 SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
SIZE:
SKU NO. SCHEMATIC NO. AND REVISION:
PCA BOM: PCA ASS'Y:
22
N/A
NC WT
LTC3305-FE LEAD ACID BATTERY BALANCER
DC2043B
700-DC2043B_REV01
710-DC2043B_REV01
705-DC2043B_REV01
Thursday, November 17, 2016
C3
4.7uF
D133
CMDZ5245B
R109 4.99
R2
6.04k
F9
D130
CMDZ5245B
TP6
D108
CMMSH1-20G TR
R106
100
R1
6.04k
D132
CMDZ5245B
D109
CMMSH1-20G TR
R13
10
TP5
D131
CMDZ5245B
Q9
SIR882DP-T1-GE3
D102
CMMSH1-20G TR
Q11
SIR882DP-T1-GE3
F2
D127
CMDZ5245B
F4
D111
CMMSH1-20G TR
E22
E12
MP2 STANDOFF,NYLON, SNAP-ON, 0.250"
TP8
R103
100
TP9
Q10
SIR882DP-T1-GE3
D103
CMMSH1-20G TR
D106
CMMSH1-20G TR
MP1 STANDOFF,NYLON, SNAP-ON, 0.250"
E13
R105
100
F1
F6 F8
D134
SMAJ60A
60V
R15
10
R100
100
D107
CMMSH1-20G TR
D135
OPT
F10
F3
Q2
SIR882DP-T1-GE3
F5
MP3 STANDOFF,NYLON, SNAP-ON, 0.250"
TP12
C1
4.7uF
R10 12.1k
0805
R5
6.04k
R9 6.04k
D110
CMMSH1-20G TR
R102
100
E9
D137
OPT
F12
MP4 STANDOFF,NYLON, SNAP-ON, 0.250"
E14
D128
CMDZ5245B
D136
OPT
E8
F11
D123
CMDZ5245B
E19 E18
C2
4.7uF
D126
CMDZ5245B
TP7
C4
4.7uF
D113
CMMSH1-20G TR
D104
CMMSH1-20G TR
R108 4.99
R107 4.99
E23
D118
CMDZ5245B
Q7
SIR882DP-T1-GE3
F13
R4
6.04k
R3
3.01k
Q3
SIR882DP-T1-GE3
D138
OPT
F14
F7
R14
10
TP11
D105
CMMSH1-20G TR
R110 4.99
R17
10
D119 CMDZ5245B
Q5
SIR882DP-T1-GE3
R18
10
D121
CMDZ5245B
D112
CMMSH1-20G TR
R12
10
D120
CMDZ5245B
Q4
SIR882DP-T1-GE3
TP10
t
RT1
0.15
R8
6.04k
R111 2
R101
100
D129
CMDZ5245B
D122
CMDZ5245B
R11 12.1k
0805
E10
D115
CMMSH1-20G TR
TP13
D116
CMDZ5245B
R16
10
D124
CMDZ5245B
Q8
SIR882DP-T1-GE3
D114
CMMSH1-20G TR
R7
6.04k
PCB1 PCB, DC2043B REV01
D117
CMDZ5245B
D125
CMDZ5245B
E11
LB1 LABEL
R6
6.04k
R104
100
E24
E21
Q6
SIR882DP-T1-GE3
E20
IB1
IB2
IB1
IB2

10
dc2043bfa
DEMO MANUAL DC2043B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 1216 REV A • 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
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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation