DEMO MANUAL
DC1721B-A/DC1721B-B
LTC4000EGN(-1)/LTC3789EGN
14.6V, 5A Battery Charger with
6VIN to 36VIN Buck-Boost Converter
DESCRIPTION
Demonstration circuit 1721B is a 14.6V, 5A battery charger
and PowerPath™ manager with 6VIN to 36VIN buck-boost
converter featuring the LTC4000/LTC3789, targeted at
4-cell LiFePO4 applications. The output of this demo board
was specifically tailored for a Tenergy 10A-hour battery,
P/N 30207. Other voltages can be set by changing ROFB2
and RBFB2. The desired nominal voltage can be accurately
trimmed by using trim resistors R42 and R43. For example,
for 14.4V battery float voltage, change ROFB2 and RBFB2
to 86.6k, and add 7.5M at R42 and R43 for greater set
point accuracy.
This circuit was designed to demonstrate the high levels of
performance, efficiency, and small solution size attainable
using these ICs in a buck-boost converter battery charger,
intelligent PowerPath manager, and power supply. It operates at 400kHz and produces a regulated 5A/14.6V battery
charger output as well as a system output of up to 6.25A
from an input voltage range of 6V to 36V: suitable for a
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
VIN
Input Supply Range
1
VIN-MP
Input Regulation Voltage
IIN2
Input Current Limit
VFLOAT
Battery Float Voltage
Output Regulation
IBAT
Battery Charge Current
VOUT-SYS
System Output Voltage
IOUT-SYS
System Output Current Range
FSW
Switching (Clock) Frequency
VOUT-SYS P-P System Output Ripple
POUT/PIN
wide variety of portable applications including instruments,
industrial equipment, power tools, and computers. It has
a total footprint area of 12.4cm2 (3.6cm2 for the LTC4000
circuit only). Synchronous rectification helps to attain
efficiency exceeding 96% at full load and nominal input.
DC1721B-A: The LTC4000 has an input current limit/
regulation loop that prevents overloading sources with
limited output capability.
DC1721B-B: The LTC4000-1 instead has an input voltage
regulation loop for Maximum Power Point (MPP) control.
MPP control extracts near maximum power from high
impedance sources such as solar panels, wind turbines,
or fuel cells.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Specifications are at TA = 25°C
CONDITIONS
TYP
6
This Is the Input Voltage Lower Limit Set by the LTC4000-1
14.4
Line and Load (6V to 36V, 0A to 5A)
12.3
VIN = 24V, IOUT-SYS = 5A (20MHz BW)
Component Area × Top Component Height
MAX
36
UNITS
V
11.85
V
11
A
14.6
14.8
V
±0.05
%
5.0
A
14.6
0
System Output Efficiency (See Figure 3) VIN = 24V, IOUT-SYS = 5A
Approximate Size
MIN
15.5
V
6.25
A
400
kHz
50
mVP-P
96.5
%
12.4cm2 × 0.40cm
1 DC1721B-B (LTC4000-1) Only,
2 DC1721B-A (LTC4000) Only
dc1721bf
1
DEMO MANUAL
DC1721B-A/DC1721B-B
QUICK START PROCEDURE
Demonstration circuit 1721 is easy to set up to evaluate the
performance of the LTC4000/LTC3789. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
WARNING: BATTERIES ARE POTENTIALLY DANGEROUS HIGH ENERGY SOURCES. IMPROPER CONNECTION, OVERCHARGE, OR RAPID DISCHARGE
COULD RESULT IN EXPLOSION AND/OR FIRE.
NOTE. When measuring the output voltage ripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the output voltage ripple by touching the
probe tip and ground ring directly across the last output
capacitor as shown in Figure 1.
1. Set MODE jumper to CCM. Set CHARGE jumper to
DISABLE.
7. Turn on the power at the input.
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
8. Once the proper VOUT-SYS is again established, adjust
the load and/or source within the operating range and
observe the output voltage regulation, ripple voltage,
efficiency, input and output current limit, and other
desired parameters.
9. Turn off the power at the input.
10. Connect the output load and meters to the BAT output.
11. Set CHARGE jumper to ENABLE.
12. Turn on the power at the input.
2. Set an input power supply that is capable of 6V to 36V
and 12A to 24V. Then turn off the supply.
13. Once the proper VOUT-SYS is again established, adjust
the load and/or source within the operating range and
observe the battery float voltage regulation and other
desired parameters.
3. With power off, connect the supply to the input terminals
VIN and GND.
14. Set the load to constant voltage mode to more easily
observe charge current and trickle charge current.
NOTE.
15. (DC1721B-B 0NLY) In order to observe MPP operation,
add a 0.25Ω to 0.3Ω, 10W resistor in series with the
DC source and set the source to 13V. Use a constant
voltage or constant resistance load characteristic. As
the load is increased, the input voltage will be regulated
at the MPP regulation point (11.75V) by reducing the
output of the DC/DC converter.
a. Input voltages lower than 6V can keep the converter
from turning on due to the undervoltage lockout feature
of the LTC4000.
b. If efficiency measurements are desired, refer to Figure 1
for test setup.
4. Turn on the power at the input.
NOTE. Make sure that the input voltage never exceeds 36V.
5. Check for the proper VOUT-SYS of 15.3V. Turn off the
power at the input.
6. Once the proper output voltages are established, connect a variable load capable of sinking 7A at 16V to the
output terminals VOUT-SYS and GND. Set the current
for 0A.
NOTE. Operation in the Instant-On region (VOUT < 12.5V)
may engage thermal limit circuit to protect Q7 in the linear
region.
NOTE. The optional thermal limit circuit for Q6 (Q9, RNTC3,
R55-59, and U4) is included to protect Q6 in case of an
extended short circuit on VOUT-SYS under adverse thermal
conditions (TA > 40°C). It may not be needed in applications with less severe thermal conditions, lower current
available to VOUT-SYS, or where continuous short-circuit
protection on VOUT-SYS is not required.
dc1721bf
2
DEMO MANUAL
DC1721B-A/DC1721B-B
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Figure 2. Proper Noise Measurement Setup
dc1721bf
3
DEMO MANUAL
DC1721B-A/DC1721B-B
QUICK START PROCEDURE
DC1721A LTC4000 and
LTC3789 Efficiency
100
VIN = 24V
EFFICIENCY (%)
95
VIN = 15V
VIN = 6V
90
VIN = 36V
85
80
0.5
1.5
2.5
3.5
IOUT (A)
4.5
5.5
Figure 3. Efficiency from VIN to VOUT-SYS
VIN
Rsense-input
VOUT-SYS
LTC3789
DC - DC CONVERTER
+
+
Rsense-charge
ITH
BAT
CC1
RC1
CC2
10nF
Gm
A10
LTC4000
A9
GND
NOT ON THE BOARD
Gm
A5
Gm
A8
Gm
A4
A7
Gm
A6
Figure 4. LTC4000/LTC3789 System Block Diagram, DC1721B-A
dc1721bf
4
DEMO MANUAL
DC1721B-A/DC1721B-B
QUICK START PROCEDURE
VIN
VOUT-SYS
LTC3789
DC - DC CONVERTER
+
+
Rsense-charge
ITH
BAT
CC1
RC1
CC2
10nF
Gm
A10
LTC4000-1
A9
GND
NOT ON THE BOARD
Gm
A5
Gm
A8
Gm
A4
A7
Gm
A6
Figure 5. LTC4000-1/LTC3789 System Block Diagram, DC1721B-B
dc1721bf
5
DEMO MANUAL
DC1721B-A/DC1721B-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1721B-A Required Circuit Components
1
4
C1, C2, C16, C17
CAP., X5R, 22μF, 25V, 10% 1210
AVX, 12103D226KAT2A
2
2
C4, C22
CAP., X7R, 0.22μF, 16V, 10% 0603
AVX, 0603YC224KAT2A
3
4
C5, C6, C9, C25
CAP., X7R, 3.3μF, 50V, 10% 1210
AVX, 12105C335KAT2A
4
1
C10
CAP., X5R, 2.2μF, 6.3V, 20% 0603
AVX, 06036D225MAT2A
5
1
C12
CAP., NPO, 390pF, 100V, 5% 1206
AVX, 12061A391JAT2A
6
1
C13
CAP., NPO, 1800pF, 100V, 5% 1206
AVX, 12061A182JAT2A
7
2
C15, CIN
CAP., X7R, 1μF, 50V, 10% 1210
AVX, 12105C105KAT2A
8
1
C18
CAP., X7R, 10μF, 10V, 10% 1206
AVX, 1206ZC106KAT2A
9
1
C19
CAP., C0G, 1000pF, 25V, 5% 0603
AVX, 06033A102JAT2A
10
2
C24, CBIAS
CAP., X7R, 1μF, 16V, 10% 0603
AVX, 0603YC105KAT2A
11
2
C34, C35
CAP., X7R, 0.01μF, 25V, 5% 0603
AVX, 06033C103JAT2A
12
3
CC2, C14, CTMR
CAP., X7R, 0.1μF, 50V, 10% 0603
AVX, 06035C104KAT2A
13
2
CIN1, CIN2
CAP., ALUM., HVH, 56μF, 50V
SUN Electronics, 50HVH56M
14
1
CL
CAP., X5R, 2.2μF, 25V, 20% 0805
AVX, 08053D225MAT2A
15
2
COUT1, COUT2
CAP., OS-CON, 150μF, 20V, 20%
SANYO, 20SVP150M
16
1
CSS
CAP., X7R, 0.022μF, 50V, 10%, 0603
AVX, 06035C223KAT2A
17
1
D2
DIODE, SWITCH 75V 350MW SOT23-3
DIODES/ZETEX, BAS16-7-F
18
1
D10
DIODE, ZENER 5.6V 500MW SOD-123
DIODES/ZETEX, BZT52C5V6-7-F
19
2
D4, D7
DIODE, SCHOTTKY 1A 60V POWERDI123
DIODES/ZETEX, DFLS160-7
20
2
D5, D6
DIODE, SCHOTTKY 40V 2A SMA
DIODES/ZETEX, B240A-13-F
21
1
D9
DIODE, ZENER 3V 500MW SOD-323
DIODES/ZETEX, BZT52C3V0S-7-F
22
1
F1
FUSE, 6.3A 32V T-LAG 1206 SMD
COOPER BUSSMAN, 3216TD6.3-R
23
1
L1
INDUCTOR, 4.7μH
TOKO, FDA1254-4R7M
24
2
Q2, Q4
MOSFET, N-Chan., 40V, POWERPAK-8
VISHAY, SiR422DP-T1-GE3
25
2
Q3, Q5
MOSFET, N-Chan., 20V, POWERPAK-8
VISHAY, SiR496DP-T1-GE3
26
2
Q6, Q7
MOSFET, P-Chan., 30V, POWERPAK-8
VISHAY, Si7135DP-T1-GE3
27
2
Q8, Q9
MOSFET, SMALL SIGNAL SOT23
ON SEMI., 2N7002LT1G
28
1
R1
RES., CHIP., 5.6Ω, 0.1W, 5% 0603
VISHAY, CRCW06035R60JNEA
29
2
R2, R18
SENSOR RES 0.008Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R008-G
30
4
R3, R4, R13, R14
RES., CHIP., 100Ω, 0.1W, 5%, 0603
VISHAY, CRCW0603100RJNEA
31
1
R5
RES., CHIP., 15Ω, 0.125W, 5% 0805
VISHAY, CRCW080515R0JNEA
32
2
R7, R49
RES., CHIP., 100k, 0.1W, 1% 0603
VISHAY, CRCW0603100KFKEA
33
2
R8, R11
RES., CHIP., 10Ω, 0.1W, 5% 0603
VISHAY, CRCW060310R0JNEA
34
2
R9, R10
RES., CHIP., 1.24k, 0.1W, 1% 0603
VISHAY, CRCW06031K24FKEA
35
1
R20
SENSOR RES 0.004Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R004-G
36
1
R21
RES., CHIP., 121k, 0.1W, 1% 0603
VISHAY, CRCW0603121KFKEA
37
6
R24, R48, R55, R60, RCX, RVM2
RES., CHIP., 10k, 0.1W, 1% 0603
VISHAY, CRCW060310K0FKEA
38
1
R28
RES., CHIP, 5.6Ω, 5%, 1206
VISHAY, CRCW12065R60JNEA
39
1
R29
RES., CHIP, 3.6Ω, 5%, 1206
VISHAY, CRCW12063R60JNEA
40
2
R44, R58
RES., CHIP., 38.3k, 0.1W, 1% 0603
VISHAY, CRCW060338K3FKEA
41
2
R50, R57
RES., CHIP., 20k, 0.1W, 1% 0603
VISHAY, CRCW060320K0FKEA
dc1721bf
6
DEMO MANUAL
DC1721B-A/DC1721B-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
42
1
R56
RES., CHIP., 68.1k, 0.1W, 1% 0603
VISHAY, CRCW060368K1FKEA
43
1
RC1
RES., CHIP., 14.7k, 0.1W, 1% 0603
VISHAY, CRCW060314K7FKEA
44
1
RCL
RES., CHIP., 24k, 0.1W, 5% 0603
VISHAY, CRCW060324K0JNEA
45
1
RCS
SENSOR RES., 0.01Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R010-G
46
1
RFB1
RES., CHIP., 154k, 0.1W, 1% 0603
VISHAY, CRCW0603154KFKEA
47
1
RFB2
RES., CHIP., 8.06k, 0.1W, 1% 0603
VISHAY, CRCW06038K06FKEA
48
1
RIG
RES., CHIP., 10M, 0.1W, 5% 0603
VISHAY, CRCW060310MJNEA
49
1
RIL
RES., CHIP., 18.2k, 0.1W, 1% 0603
VISHAY, CRCW060318K2FKEA
50
2
RNTC2, RNTC3
THERMISTOR NTC 10k 5% 0603
VISHAY, NTCS0603E3103JMT
51
4
ROFB1, RBFB1, R45, R59
RES., CHIP., 1M, 0.1W, 1% 0603
VISHAY, CRCW06031M00FKEA
52
2
ROFB2, RBFB2
RES., CHIP., 84.5k, 0.1W, 1% 0603
VISHAY, CRCW060384K5FKEA
53
1
RVM1
RES., CHIP., 36.5k, 0.1W, 1% 0603
VISHAY, CRCW060336K5FKEA
54
1
U1
I.C., VOLT. REG.
Linear Tech., LTC3789EGN#PBF
55
1
U2
I.C. LTC4000EGN, 28 PIN SSOP
Linear Tech., LTC4000EGN#PBF
56
2
U3, U4
NANOPWR COMPARATOR, MSOP8
Linear Tech., LTC1540CMS8#PBF
DC1721B-A Additional Demo Board Circuit Components
57
0
C3, C23, C26, C27
OPT 1210
58
1
C33
CAP., X5R, 4.7μF, 10V, 20% 0603
AVX, 0603ZD475MAT2A
59
1
CBAT
CAP., X5R, 2.2μF, 25V, 20% 0805
AVX, 08053D225MAT2A
60
0
CF1, CC1, R6, C7, C8, C11, R12, R22, R27, R30,
R38-R43, R53, R61, R62, CNTC, CF, CCX
OPT 0603
OPT
61
2
CIIMON, CIBMON
CAP., C0G, 1000pF, 25V, 5% 0603
AVX, 06033A102JAT2A
62
0
CIN3, CIN4
OPT
63
0
D11
OPT SOD323
64
1
LED2
LED, DUAL RED/GREEN
LiteOn, LTST-C155KGJRKT
65
0
Q10
OPT SOT223
OPT
66
4
R25, R51, R52, R54
RES., 0Ω 1/16W 1A 0603
VISHAY, CRCW06030000Z0EA
67
1
R46
RES., CHIP., 2.2k, 0.1W, 5% 0603
VISHAY, CRCW06032K20JNEA
68
1
R47
RES., CHIP., 4.7k, 0.1W, 5% 0603
VISHAY, CRCW06034K70JNEA
69
0
RIFB1
OPT 0603
OPT
OPT
DC1721B-A Hardware: For Demo Board Only
70
6
E1, E2, E15, E17, E18, E20
TESTPOINT, TURRET, 0.061" PbF
MILL-MAX, 2308-2-00-80-00-00-07-0
71
12
E3-E14
TESTPOINT, TURRET, 0.094" PbF
MILL-MAX, 2501-2-00-80-00-00-07-0
72
5
J1, J2, J3, J4, J5
CONNECTOR, BANANA JACK
KEYSTONE, 575-4
73
2
JP1, JP2
HEADER, 3 PIN 0.079 SINGLE ROW
SAMTEC, TMM-103-02-L-S
74
4
MH1-MH4
STAND-OFF, NYLON 0.5"
KEYSTONE, 8833 (SNAP ON)
75
2
XJP1, XJP2
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
dc1721bf
7
DEMO MANUAL
DC1721B-A/DC1721B-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1721B-B Required Circuit Components
1
4
C1, C2, C16, C17
CAP., X5R, 22μF, 25V, 10% 1210
AVX, 12103D226KAT2A
2
2
C4, C22
CAP., X7R, 0.22μF, 16V, 10% 0603
AVX, 0603YC224KAT2A
3
4
C5, C6, C9, C25
CAP., X7R, 3.3μF, 50V, 10% 1210
AVX, 12105C335KAT2A
4
1
C10
CAP., X5R, 2.2μF, 6.3V, 20% 0603
AVX, 06036D225MAT2A
5
1
C12
CAP., NPO, 390pF, 100V, 5% 1206
AVX, 12061A391JAT2A
6
1
C13
CAP., NPO, 1800pF, 100V, 5% 1206
AVX, 12061A182JAT2A
7
2
C15, CIN
CAP., X7R, 1μF, 50V, 10% 1210
AVX, 12105C105KAT2A
8
1
C18
CAP., X7R, 10μF, 10V, 10% 1206
AVX, 1206ZC106KAT2A
9
1
C19
CAP., C0G, 1000pF, 25V, 5% 0603
AVX, 06033A102JAT2A
10
2
C24, CBIAS
CAP., X7R, 1μF, 16V, 10% 0603
AVX, 0603YC105KAT2A
11
2
C34, C35
CAP., X7R, 0.01μF, 25V, 5% 0603
AVX, 06033C103JAT2A
12
3
CC2, C14, CTMR
CAP., X7R, 0.1μF, 50V, 10% 0603
AVX, 06035C104KAT2A
13
2
CIN1, CIN2
CAP., ALUM., HVH, 56μF, 50V
SUN Electronics, 50HVH56M
14
1
CL
CAP., X5R, 2.2μF, 25V, 20% 0805
AVX, 08053D225MAT2A
15
2
COUT1, COUT2
CAP., OS-CON, 150μF, 20V, 20%
SANYO, 20SVP150M
16
1
CSS
CAP., X7R, 0.022μF, 50V, 10%, 0603
AVX, 06035C223KAT2A
17
1
D2
DIODE, SWITCH 75V 350MW SOT23-3
DIODES/ZETEX, BAS16-7-F
18
2
D4, D7
DIODE, SCHOTTKY 1A 60V POWERDI123
DIODES/ZETEX, DFLS160-7
19
2
D5, D6
DIODE, SCHOTTKY 40V 2A SMA
DIODES/ZETEX, B240A-13-F
20
1
D9
DIODE, ZENER 3V 500MW SOD-323
DIODES/ZETEX, BZT52C3V0S-7-F
21
1
D10
DIODE, ZENER 5.6V 500MW SOD-123
DIODES/ZETEX, BZT52C5V6-7-F
22
1
F1
FUSE, 6.3A 32V T-LAG 1206 SMD
COOPER BUSSMAN, 3216TD6.3-R
23
1
L1
INDUCTOR, 4.7μH
TOKO, FDA1254-4R7M
24
2
Q2, Q4
MOSFET, N-Chan., 40V, POWERPAK-8
VISHAY, SiR422DP-T1-GE3
25
2
Q3, Q5
MOSFET, N-Chan., 20V, POWERPAK-8
VISHAY, SiR496DP-T1-GE3
26
2
Q6, Q7
MOSFET, P-Chan., 30V, POWERPAK-8
VISHAY, Si7135DP-T1-GE3
27
2
Q8, Q9
MOSFET, SMALL SIGNAL SOT23
ON SEMI., 2N7002LT1G
28
1
R1
RES., CHIP., 5.6Ω, 0.1W, 5% 0603
VISHAY, CRCW06035R60JNEA
29
2
R2, R18
SENSOR RES 0.008Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R008-G
30
4
R3, R4, R13, R14
RES., CHIP., 100Ω, 0.1W, 5%, 0603
VISHAY, CRCW0603100RJNEA
31
1
R5
RES., CHIP., 15Ω, 0.125W, 5% 0805
VISHAY, CRCW080515R0JNEA
32
2
R7, R49
RES., CHIP., 100k, 0.1W, 1% 0603
VISHAY, CRCW0603100KFKEA
33
2
R8, R11
RES., CHIP., 10Ω, 0.1W, 5% 0603
VISHAY, CRCW060310R0JNEA
34
2
R9, R10
RES., CHIP., 1.24k, 0.1W, 1% 0603
VISHAY, CRCW06031K24FKEA
35
1
R20
SENSOR RES 0.004Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R004-G
36
1
R21
RES., CHIP., 121k, 0.1W, 1% 0603
VISHAY, CRCW0603121KFKEA
37
6
R24, R48, R55, R60, RCX, RVM2
RES., CHIP., 10k, 0.1W, 1% 0603
VISHAY, CRCW060310K0FKEA
38
1
R28
RES., CHIP, 5.6Ω, 5%, 1206
VISHAY, CRCW12065R60JNEA
39
1
R29
RES., CHIP, 3.6Ω, 5%, 1206
VISHAY, CRCW12063R60JNEA
40
2
R44, R58
RES., CHIP., 38.3k, 0.1W, 1% 0603
VISHAY, CRCW060338K3FKEA
41
2
R50, R57
RES., CHIP., 20k, 0.1W, 1% 0603
VISHAY, CRCW060320K0FKEA
dc1721bf
8
DEMO MANUAL
DC1721B-A/DC1721B-B
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
42
1
R56
RES., CHIP., 68.1k, 0.1W, 1% 0603
VISHAY, CRCW060368K1FKEA
43
1
RC1
RES., CHIP., 14.7k, 0.1W, 1% 0603
VISHAY, CRCW060314K7FKEA
44
1
RCL
RES., CHIP., 24k, 0.1W, 5% 0603
VISHAY, CRCW060324K0JNEA
45
1
RCS
SENSOR RES., 0.01Ω 1W 2% 0815 SMD
SUSUMU, RL3720WT-R010-G
46
1
RFB1
RES., CHIP., 154k, 0.1W, 1% 0603
VISHAY, CRCW0603154KFKEA
47
1
RFB2
RES., CHIP., 8.06k, 0.1W, 1% 0603
VISHAY, CRCW06038K06FKEA
48
1
RIFB1
RES., CHIP., 21.5k, 0.1W, 1% 0603
VISHAY, CRCW060321K5FKEA
49
1
RIG
RES., CHIP., 10M, 0.1W, 5% 0603
VISHAY, CRCW060310MJNEA
50
1
RIL
RES., CHIP., 2.00k, 0.1W, 1% 0603
VISHAY, CRCW06032K00FKEA
51
2
RNTC2, RNTC3
THERMISTOR NTC 10k 5% 0603
VISHAY, NTCS0603E3103JMT
52
4
ROFB1, RBFB1, R45, R59
RES., CHIP., 1M, 0.1W, 1% 0603
VISHAY, CRCW06031M00FKEA
53
2
ROFB2, RBFB2
RES., CHIP., 84.5k, 0.1W, 1% 0603
VISHAY, CRCW060384K5FKEA
54
1
RVM1
RES., CHIP., 36.5k, 0.1W, 1% 0603
VISHAY, CRCW060336K5FKEA
55
1
U1
I.C., VOLT. REG.
Linear Tech., LTC3789EGN#PBF
56
1
U2
I.C. LTC4000EGN-1, 28 PIN SSOP
Linear Tech., LTC4000EGN-1#PBF
57
2
U3, U4
NANOPWR COMPARATOR, MSOP8
Linear Tech., LTC1540CMS8#PBF
DC1721B-B Additional Demo Board Circuit Components
58
0
C3, C23, C26, C27
OPT 1210
59
1
C33
CAP., X5R, 4.7μF, 10V, 20% 0603
60
1
CBAT
CAP., X5R, 2.2μF, 25V, 20% 0805
AVX, 08053D225MAT2A
61
0
CF1, CC1, R6, C7, C8, C11, R12, R22, R27, R30,
R38-R43, R53, R61, R62, CNTC, CF, CCX
OPT 0603
OPT
62
2
CIIMON, CIBMON
CAP., C0G, 1000pF, 25V, 5% 0603
AVX, 06033A102JAT2A
63
0
CIN3, CIN4
OPT
64
0
D11
OPT SOD323
OPT
65
1
LED2
LED, DUAL RED/GREEN
LiteOn, LTST-C155KGJRKT
66
0
Q10
OPT SOT223
OPT
67
4
R25, R51, R52, R54
RES., 0Ω 1/16W 1A 0603
VISHAY, CRCW06030000Z0EA
68
1
R46
RES., CHIP., 2.2k, 0.1W, 5% 0603
VISHAY, CRCW06032K20JNEA
69
1
R47
RES., CHIP., 4.7k, 0.1W, 5% 0603
VISHAY, CRCW06034K70JNEA
AVX, 0603ZD475MAT2A
DC1721B-B Hardware: For Demo Board Only
70
6
E1, E2, E15, E17, E18, E20
TESTPOINT, TURRET, 0.061" PbF
MILL-MAX, 2308-2-00-80-00-00-07-0
71
12
E3-E14
TESTPOINT, TURRET, 0.094" PbF
MILL-MAX, 2501-2-00-80-00-00-07-0
72
5
J1, J2, J3, J4, J5
CONNECTOR, BANANA JACK
KEYSTONE, 575-4
73
2
JP1, JP2
HEADER, 3 PIN 0.079 SINGLE ROW
SAMTEC, TMM-103-02-L-S
74
4
MH1-MH4
STAND-OFF, NYLON 0.5"
KEYSTONE, 8833 (SNAP ON)
75
2
XJP1, XJP2
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
dc1721bf
9
A
B
C
R57
20K
R56
68.1K
R59
1.00M
R58
38.3K
E12
E13
6
5
4
3
CHRG
JP1
2
CHARGE
BIAS
*
6 REF
HYST
IN-
IN+
RVM2
10K
RVM1
36.5K
R20
FROM PAGE 2
+
-
5
IN
CLN
RST
D9
BZT52C3V0S
23
22
26
ITH
OUT
8
1
U4
LTC1540CMS8
CIN
1uF
50V
1210
VIN
OPTIONAL THERMAL PROTECTION FOR Q6
DURING VOUT-SYS SHORT CIRCUIT
RNTC3
10K
R55
10K
BIAS
FLT
CHRG
DISABLE
ENABLE
IL
RIFB1
VIN+
VIN+
RUN
20
CC2
0.1uF
RC1
CC1
OPT
14.7K
R52
0
R54
0
IL
2
1
Q9
2N7002L
R51
0
R53
OPT
VOUT
RIG
10M
3
2
1
R50
20K
R49
100K
ROFB2
84.5K
ROFB1
1.00M
R46
2.2K
R45
1.00M
R44
38.3K
6
5
4
3
R47
4.7K
*
6 REF
HYST
IN-
IN+
4
3
CIIMON
1000pF
U2
R43 OPT
R62
OPT
CHRG
RCS
10m
RED
GRN
+
-
4
2
1
3
2
1
INTVCC
CIBMON
1000pF
OUT
*
RIL
IL
8
1
7
6
5
8
3
C35
0.01uF
Q7
Si7135D
U3
LTC1540CMS8
LED2
CTMR
0.1uF
TMR
THERMAL REGULATION FOR Q7
DURING 'INSTANT-ON' OPERATION
RNTC2
10K
R48
10K
BIAS
7
6
5
8
Q6
Si7135D
4
4
15
D
1
3
13
ITH
7
V+
V-
2
21
CC
VM
25
3
2
ENC
1
19
IID
CHRG
8
18
IGATE
FLT
7
16
CSP
IIMON
27
17
OFB
2
IBMON
2
GND
1
7
V-
CSN
TMR
5
GND
1
V+
4
14
BGATE
IL/IFB
28
RBFB1
1.00M
3
3
9
BIAS
OPT
LTC4000EGN-1
-B
RIL
18.2K
21.5K 2.00K
RIFB1
U2
LTC4000EGN
ASSY
-A
CBIAS
1uF
10V
R38
OPT
CBAT
2.2uF
25V
0805
CL
2.2uF
25V
0805
__
ECO
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
DAVID B.
LT
APPROVALS
J3
E11
E10
DATE:
N/A
SIZE
VOUT-SYS
15V
6.25A LIMIT
J5
E14
NTC
GND
DATE
1-29-13
1
SHEET 1
LTC4000EGN / EGN-1, LTC3789EGN
DEMO CIRCUIT 1721B
OF 2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DAVID B.
APPROVED
STEP UP/DOWN BATTERY CHARGER
AND POWER MANAGER
TECHNOLOGY
IIMON
NOT ON THE BOARD
BAT
14.6V / 5A
Wednesday, February 06, 2013
IC NO.
DESCRIPTION
PRODUCTION
GND
1
REVISION HISTORY
IBMON
GND
E18
E17
J4
E20
E15
2
REV
TITLE: SCHEMATIC
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
*
RCX
10K
TMR
R39
OPT
CNTC
OPT
CUSTOMER NOTICE
CCX
OPT
CX
BIAS
NTC
10
NTC
F1
6.3A
2
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.
Q8
2N7002L
NTC
C33
4.7uF
10V
RCL
24K
RBFB2
84.5K
R42 OPT
11
FBG
12
BFB
GND
6
BAT
CL
4
3
2
GND
10
24
5
A
B
C
D
DEMO MANUAL
DC1721B-A/DC1721B-B
SCHEMATIC DIAGRAM
dc1721bf
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
D
INTVCC
EXTVCC
PLLIN
SS
SGND
PGOOD
VLOGIC
R30
OPT
R24
10K
EXTVCC
BIAS
E9
RUN
E8
CCM
2
MODE
JP2
INTVCC
PULSE
SKIP
E7
E6
E5
E4
E3
1
3
5
RFB2
8.06K
INTVCC
OPT
C8
C7
CSS
0.022uF
R27
OPT
R22
OPT
OPT
R14
100
VOUT
R10
R9
CF1
OPT
RFB1
154K
R7
100K
R25
0
R3
14
13
12
11
10
9
8
7
6
4
100
NC
SW2
TG2
BOOST2
BG2
EXTVCC
INTVCC
VIN
BG1
PGND1
BOOST1
TG1
SW1
PGOOD
U1
LTC3789EGN
R41
OPT
EXTVCC
C14
0.1uF
CF
OPT INTVCC
C11
1.24K
OPT
R60 10K ITH
1.24K
VOS+
4
TG1
SW1
Q10
OPT
(FZT603)
C22
0.22uF
16V
D7
DFLS160
1206
C18
10uF
D4
DFLS160
C4
0.22uF
16V
R5
15
0805
1
2
4
Q2
SiR422DP
1
BG1
3
+
C26
C27
OPT
Q3 VOUT1
SiR496DP
CIN4
OPT
4
Q5
SiR496DP
4.7uH
L1
4
+
BG2
CS
SW2
TG2
CUSTOMER NOTICE
R18
0.008
2%
D5
B240A
C12
390pF
1206
R28
5.6
1206
CIN3
OPT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
VIN
2
SCALE = NONE
DAVID B.
LT
APPROVALS
R29
3.6
1206
C13
1.8nF
1206
+
C9
C25
3.3uF
50V
1210
COUT1
150uF
D6 20V
B240A
2
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.
R61
OPT
(10K)
D11
1 OPT
10V
(MM3Z10VT1)
2
5.6
D2
BAS16
R1
3
4
Q4
SiR422DP
3
8
5
6
7
INTVCC
2
1
1
2
1
2
3
8
5
6
7
1
2
3
8
5
6
7
1
2
3
8
5
6
7
1
2
3
5
DATE:
N/A
SIZE
+
C3
C23
OPT
16V
1210
CIN1
56uF
50V
20V
COUT2
CIN2
56uF
50V
+ 150uF
+
VOUT
J2
E2
E1
J1
R8
10
VOS+
GND
GND
VIN+
VIN
6V - 36V
11A MAX
1
SHEET 2
LTC4000EGN /EGN-1, LTC3789EGN
DEMO CIRCUIT 1721B
STEP UP/DOWN BATTERY CHARGER
AND POWER MANAGER
OF 2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Wednesday, January 30, 2013
IC NO.
C5
C6
3.3uF
50V
1210
VIN+
TECHNOLOGY
0.008
2%
R2
TITLE: SCHEMATIC
C1
C2
C16
C17
22uF
25V
1210
0.004
2%
R20
1
A
B
C
D
DEMO MANUAL
DC1721B-A/DC1721B-B
SCHEMATIC DIAGRAM
dc1721bf
11
DEMO MANUAL
DC1721B-A/DC1721B-B
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1721bf
12 Linear Technology Corporation
LT 0313 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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