DC1721A-A - Demo Manual

DEMO MANUAL DC1721A-A
LTC4000EGN/LTC3789EGN
14.6V, 5A Battery Charger with 6VIN
to 36VIN Buck-Boost Converter
DESCRIPTION
Demonstration circuit 1721A-A is a 14.6V, 5A battery
charger and PowerPath™ manager with 6VIN to 36VIN
buck-boost converter featuring the LTC®4000/LTC3789,
targeted at 4-cell LiFePO4 applications. The output of this
demo board was specifically tailored for a Tenergy 10Ahour 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.
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
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.
This circuit was designed to demonstrate the high levels of
performance, efficiency, and small solution size attainable
using these parts in a buck-boost converter battery charger,
L, LT, LTC, LTM, μModule, 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.
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
VIN
Input Supply Range
IIN
Input Current Limit
VFLOAT
Battery Float Voltage
Output Regulation
Design files for this circuit board are available at
http://www.linear.com/demo
(TA = 25°C)
CONDITIONS
MIN
TYP
6
MAX
36
11
14.4
Line and Load (6V to 36V, 0A to 5A)
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
System Output Efficiency (See Figure 3)
VIN =24V, IOUT_SYS = 5A
Approximate Size
Component Area × Top Component Height
14.6
0
VIN = 24V, IOUT_SYS = 5A (20MHz BW)
V
%
5
14.6
V
A
14.8
±0.05
12.3
UNITS
A
15.5
6.25
V
A
400
kHz
50
mVP-P
96.5
%
12.4cm2 × 0.40cm
dc1721aaf
1
DEMO MANUAL DC1721A-A
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. Connect a low ESR electrolytic capacitor to the BAT
output (≥1800μF at ≥20V).
NOTE: This capacitor helps simulate the low impedance of a battery and maintain stability of the charge
current loop. It is only needed for test purposes with
electronic or resistive loads, and not needed in the
actual application (where the load is a battery).
2. Set MODE jumper to CCM. Set CHARGE jumper to
DISABLE.
3. Set an input power supply that is capable of 6V to 36V
and 12A to 24V. Then turn off the supply.
4. With power off, connect the supply to the input terminals
VIN and GND.
NOTE:
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.
5. Turn on the power at the input.
NOTE: Make sure that the input voltage never
exceeds 36V.
6. Check for the proper VOUT_SYS of 15.3V. Turn off the
power at the input.
7. 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.
8. 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.
9. 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.
10. Turn off the power at the input.
11. Connect the output load and meters to the BAT output.
12. Set CHARGE jumper to ENABLE.
13. Turn on the power at the input.
14. 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.
15. Set the load to constant voltage mode to more easily
observe charge current and trickle charge current.
NOTE: Operation in the instant-on region (VOUT < 12.5V)
may engage thermal limit circuit to protect Q7 in linear
region.
NOTE: The optional thermal limit circuit for Q6 (Q9,
RNTC3, R55-R59, 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.
dc1721aaf
2
DEMO MANUAL DC1721A-A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Figure 2. Proper Noise Measurement Setup
dc1721aaf
3
DEMO MANUAL DC1721A-A
QUICK START PROCEDURE
100
EFFICIENCY (%)
95
90
85
80
0.5
VIN = 6V
VIN = 15V
VIN = 24V
VIN = 36V
1.5
2.5
3.5
IOUT (A)
4.5
5.5
dc1721aa F03
Figure 3. Efficiency from VIN to VOUT_SYS
LTC4000 / LTC3789 SYSTEM BLOCK DIAGRAM
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. Block Diagram
dc1721aaf
4
DEMO MANUAL DC1721A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
CL, CBAT
Capacitor, X5R, 2.2μF, 25V, 20%, 0805
AVX, 08053D225MAT2A
2
2
C24, CBIAS
Capacitor, X7R, 1μF, 16V, 10%, 0603
AVX, 0603YC105KAT2A
3
3
CC2, C14, CTMR
Capacitor, X7R, 0.1μF, 50V, 10%, 0603
AVX, 06035C104KAT2A
4
3
CIIMON, CIBMON, C19
Capacitor, C0G, 1000pF, 25V, 5%, 0603
AVX, 06033A102JAT2A
5
2
C15, CIN
Capacitor, X7R, 1μF, 50V, 10%, 1210
AVX, 12105C105KAT2A
6
2
CIN1, CIN2
Capacitor, Alum, HVH, 56μF, 50V
Sun Electronics, 50HVH56M
7
2
COUT1, COUT2
Capacitor, OS-CON, 150μF, 20V, 20%
Sanyo, 20SVP150M
8
1
CSS
Capacitor, X7R, 0.022μF, 50V, 10%, 0603
AVX, 06035C223KAT2A
9
4
C1, C2, C16, C17
Capacitor, X5R, 22μF, 25V, 10%, 1210
AVX, 12103D226KAT2A
10
2
C4, C22
Capacitor, X7R, 0.22μF, 16V, 10%, 0603
Taiyo Yuden, EMK107BJ224KA
11
4
C5, C6, C9, C25
Capacitor, X7R, 3.3μF, 50V, 10%, 1210
AVX, 12105C335KAT2A
12
1
C10
Capacitor, X5R, 2.2μF, 6.3V, 20%, 0603
AVX, 06036D225MAT2A
13
1
C12
Capacitor, NPO, 390pF, 100V, 5%, 1206
AVX, 12061A391JAT2A
14
1
C13
Capacitor, NPO, 1.8nF, 100V, 5%, 1206
AVX, 12061A182JAT2A
15
1
C18
Capacitor, X7R, 10μF, 10V, 10%, 1206
AVX, 1206ZC106KAT2A
16
1
C33
Capacitor, X5R, 4.7μF, 10V, 20%, 0603
AVX, 0603ZD475MAT2A
17
2
C34, C35
Capacitor, X7R, 10nF, 25V, 5%, 0603
AVX, 06033C103JAT2A
18
1
D2
Diode, Switch, 75V, 350mW, SOT23-3
Diode Inc., BAS16-7-F
19
2
D4, D7
Diode, Schottky, 1A, 60V, POWERDI123
Diode Inc., DFLS160-7
20
2
D5, D6
Diode, Schottky, 40V, 2A, SMA
Diode Inc., B240A-13-F
21
1
D9
Diode, Zener, SM, BZT52C3V0, SOD323
Diodes, BZT52C3V0
22
1
D10
Diode, Zener, 5.6V, 500mW, SOD123
Diode Inc., BZT52C5V6
23
1
F1
FUSE, 6.3A 32V, T-Lag, 1206, SMD
Cooper Bussman, 3216TD6.3-R
24
1
LED2
LED, Dual Red/Green
LiteOn, LTST-C155KGJRKT
25
1
L1
Inductor, 4.7μH
Toko, FDA1254-4R7M
26
2
Q2, Q4
MOSFET N-Channel, 40V, POWERPAK-8
Vishay, SiR422DP-T1-GE3
27
2
Q3, Q5
MOSFET N-Channel, 20V, POWERPAK-8
Vishay, SiR496DP-T1-GE3
28
2
Q6, Q7
MOSFET P-Channel, 30V, 1206-8 ChipFET
Vishay, Si7135DP
29
1
Q8
Small Signal MOSFET
On Semi, 2N7002LT1G
30
3
ROFB1, RBFB1, R45
Resistor, Chip, 1M, 0.1W, 1%, 0603
Vishay, CRCW06031M00FKEA
31
2
ROFB2, RBFB2
Resistor, Chip, 84.5k, 0.1W, 1%, 0603
Vishay, CRCW060384K5FKEA
32
1
RCL
Resistor, Chip, 24k, 0.1W, 5%, 0603
Vishay, CRCW060324KJKEA
33
1
RIL
Resistor, Chip, 18.2k, 0.1W, 1%, 0603
Vishay, CRCW060318K2FKEA
34
1
RCS
Sensor Resistor, 0.01Ω, 1W, 2%, 1508 SMD
Susumu, RL3720WT-R010-G
dc1721aaf
5
DEMO MANUAL DC1721A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
35
5
R24, R48, R60, RCX, RVM2
Resistor, Chip, 10k, 0.1W, 1%, 0603
Yageo, RC0603FR-0710KL
36
1
RC1
Resistor, Chip, 14.7k, 0.1W, 1%, 0603
Yageo, RC0603FR-0714K7L
37
1
RFB1
Resistor, Chip, 154k, 0.1W, 1%, 0603
Vishay, CRCW0603154KFKEA
38
1
RFB2
Resistor, Chip, 8.06k, 0.1W, 1%, 0603
Vishay, CRCW06038K06FKEA
39
1
RVM1
Resistor, Chip, 36.5k, 0.1W, 1%, 0603
Vishay, CRCW060336K5FKEA
40
2
R7, R49
Resistor, Chip, 100k, 0.1W, 1%, 0603
Vishay, CRCW0603100KFKEA
41
1
RNTC2
Thermistor, NTC, 10kΩ, 5%, 0603
Vishay, NTHS0603N02N1002J
42
1
R1
Resistor, Chip, 5.6Ω, 0.1W, 5%, 0603
Vishay, CRCW06035R60JNEA
43
4
R3, R4, R13, R14
Resistor, Chip, 100Ω, 0.1W, 5%, 0603
Vishay, CRCW0603100RJNEA
44
1
R5
Resistor, Chip, 15Ω, 0.125W, 5%, 0805
Vishay, CRCW080515R0JNEA
45
2
R8, R11
Resistor, Chip, 100Ω, 0.1W, 5%, 0603
Vishay, CRCW060310R0JNEA
46
2
R9, R10
Resistor, Chip, 1.24k, 0.1W, 1%, 0603
Vishay, CRCW06031K24FKEA
47
2
R2, R18
Sensor Resistor, 0.008Ω, 1W, 2%, 1508, SMD
Susumu, RL3720WT-R008-G
48
1
R20
Sensor Resistor, 0.004Ω, 1W, 2%, 1508, SMD
Susumu, RL3720WT-R004-G
49
1
R21
Resistor, Chip, 121k, 0.1W, 1%, 0603
Vishay, CRCW0603121KFKEA
50
4
R25, R51, R52, R54
Resistor, 0Ω, 1/16W, 1A, 0603
Yageo, RC0603FR-070RL
51
1
R28
Resistor, Chip, 5.6Ω, 5%, 1206
Vishay, CRCW12065R60JNEA
52
1
R29
Resistor, Chip, 3.6Ω, 5%, 1206
Yageo, RC1206JR-073R6L
53
1
R44
Resistor, Chip, 38.3k, 0.1W, 1%, 0603
Vishay, CRCW060338K3FKEA
54
1
R46
Resistor, Chip, 2.2k, 0.1W, 5%, 0603
Vishay, CRCW06032K2JKEA
55
1
R47
Resistor, Chip, 4.7k, 0.1W, 5%, 0603
Vishay, CRCW06034K7JKEA
56
1
R50
Resistor, Chip, 20k, 0.1W, 1%, 0603
Vishay, CRCW060320K0FKEA
57
1
U1
IC,Voltage Regulator
Linear Technology, LTC3789EGN#PBF
58
1
U2
IC, LTC4000EGN, 28-Pin SSOP
Linear Technology, LTC4000EGN#PBF
59
1
U3
NANOPWR Comparator, MSOP8
Linear Technology, LTC1540CMS8#PBF
dc1721aaf
6
DEMO MANUAL DC1721A-A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Additional Circuit Components
1
0
CF1, CC1, R6, C7, C8, C11,
OPT, 0603
R12, R22, R27, R30, R38, R39,
R40, R41, R53, R61, CNTC,
CF, CCX
2
0
CIN3, CIN4
OPT
3
0
C3, C23, C26, C27
OPT, 1210
4
0
D8, D11
OPT
5
1
Q9
Small Signal MOSFET
6
0
Q10
OPT
7
1
RNTC3
Thermistor, NTC, 10kΩ, 5%, 0603
8
0
R42, R43
OPT
On Semi, 2N7002LT1G
Vishay, NTHS0603N02N1002J
9
1
R55
Resistor, Chip, 10k, 0.1W, 1%, 0603
Yageo, RC0603FR-0710KL
10
1
R56
Resistor, Chip, 68.1k, 0.1W, 1%, 0603
Vishay, CRCW060368K1FKEA
11
1
R57
Resistor, Chip, 20k, 0.1W, 1%, 0603
Vishay, CRCW060320K0FKEA
12
1
R58
Resistor, Chip, 38.3k, 0.1W, 1%, 0603
Vishay, CRCW060338K3FKEA
13
1
R59
Resistor, Chip, 1M, 0.1W, 1%, 0603
Vishay, CRCW06031M00FKEA
14
1
U4
NANOPWR Comparator, MSOP8
Linear Technology, LTC1540CMS8#PBF
Hardware/Components (For Demo Board Only)
1
6
E1, E2, E15, E17, E18, E20
Testpoint, Turret, 0.061" pbf
Mill-Max, 2308-2-00-80-00-00-07-0
2
12
E3, E4, E5, E6, E7, E8, E9, E10,
E11, E12, E13, E14
Testpoint, Turret, 0.094" pbf
Mill-Max, 2501-2-00-80-00-00-07-0
3
2
JP1, JP2
Header, 3-Pin, 0.079 Single Row
Samtec, TMM-103-02-L-S
4
2
XJP1, XJP2
Shunt, 0.079" Center
Samtec, 2SN-BK-G
5
5
J1, J2, J3, J4, J5
Connector, Banana Jack
Keystone, 575-4
6
4
(STAND-OFF)
Stand-Off, Nylon 0.25"
Keystone, 8831 (Snap On)
dc1721aaf
7
A
B
C
R57
20K
R56
68.1K
R59
1.00M
R58
38.3K
6
5
4
3
6 REF
HYST
IN-
IN+
E12
E13
JP1
2
+
-
5
IN
CLN
RST
D9
BZX84C3V0
23
22
26
ITH
OUT
8
1
U4
LTC1540CMS8
RVM2
10K
CIN
1uF
50V
1210
VIN
OPTIONAL THERMAL PROTECTION FOR Q6
DURING VOUT-SYS SHORT CIRCUIT
RNTC3
10K
R55
10K
BIAS
FLT
CHRG
DISABLE
ENABLE
CHARGE
BIAS
RVM1
36.5K
R20
FROM PAGE 2
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
7
6
5
8
Q6
Si7135DP
R50
20K
R49
100K
U2
ROFB1
1.00M
ROFB2
84.5K
R43 OPT
RCS
10m
R45
1.00M
R44
38.3K
6
5
4
3
R47
4.7K
R46
2.2K
4
3
6 REF
HYST
IN-
IN+
CIIMON
1000pF
TMR
RED
GRN
+
-
4
2
1
3
2
1
INTVCC
CIBMON
1000pF
OUT
RIL
18.2K
IL
8
1
7
6
5
8
3
C35
0.01uF
Q7
Si7135DP
U3
LTC1540CMS8
LED2
CTMR
0.1uF
LTC4000EGN
3
2
1
THERMAL REGULATION FOR Q7
DURING 'INSTANT-ON' OPERATION
RNTC2
10K
R48
10K
BIAS
4
15
D
1
3
13
ITH
7
V+
V-
2
21
CC
VM
25
3
2
ENC
1
4
18
IGATE
19
IID
CHRG
8
IIMON
27
FLT
7
16
CSP
17
OFB
2
IBMON
2
GND
1
7
V-
CSN
TMR
5
GND
1
V+
4
14
BGATE
IL
28
RBFB1
1.00M
3
3
9
BIAS
2
CBIAS
1uF
10V
OPT
1 D8
2
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.
AK
DAVID B.
2
SCALE = NONE
APP ENG.
PCB DES.
APPROVALS
J3
E11
E10
DATE:
N/A
SIZE
DESCRIPTION
VOUT-SYS
15V
6.25A LIMIT
PRODUCTION
J5
E14
NTC
GND
DATE
05-11-11
1
LTC4000EGN, LTC3789EGN
DEMO CIRCUIT 1721A
Wednesday, May 11, 2011
IC NO.
SHEET 1
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
14.4V, 4.5A BATTERY CHARGER WITH HIGH EFFICIENCY,
6-36 VIN, STEP-UP/DOWN DC/DC CONVERTER
TECHNOLOGY
IIMON
NOT ON THE BOARD
BAT
14.6V / 5A
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
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.
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
8
24
5
A
B
C
D
DEMO MANUAL DC1721A-A
SCHEMATIC DIAGRAM
dc1721aaf
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
C34
10nF
R25
0
R13
100
VIN
R3
14
13
12
11
10
9
8
7
6
4
<------
100
R4
IOSENSE-
IOSENSE+
ILIM
VOUTSNS
VINSNS
RUN
FREQ
MODE/PLLIN
SGND
ITH
SENSE1-
SENSE1+
SS
VFB
CIRCUITRY ON THIS
SIDE MUST CONNECT
TO SIGNAL GND
GROUNDPLANE
C10
2.2uF
R21 121K 1%
C19
1.0nF
5
4
3
2
1
R40
OPT
INTVCC
ITH
R12
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1uF
C15
1uF
50V
OPT
R6
OPT
D10
BZT52C5V6
VOUT1
INTVCC
R11
10
2 1
C24
CIRCUITRY ON THIS
SIDE MUST CONNECT
TO POWER GND
GROUNDPLANE
------>
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 10.0K 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
+
Q5
SiR496DP
4
4.7uH
L1
4
CIN4
OPT
C26
C27
OPT
Q3 VOUT1
SiR496DP
+
BG2
CS
SW2
TG2
CUSTOMER NOTICE
R18
8m
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.
AK
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
2 (MM3Z10VT1)
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
VIN+
C5
C6
3.3uF
50V
1210
+
C3
C23
OPT
16V
1210
CIN1
56uF
50V
VOUT
J2
E2
E1
R8
10
VOS+
GND
GND
VIN+
VIN
6V - 36V
11A LIMIT
1
SHEET 2
LTC4000EGN, LTC3789EGN
DEMO CIRCUIT 1721A
Wednesday, April 13, 2011
IC NO.
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
20V
COUT2
CIN2
56uF
50V
+ 150uF
+
J1
14.4V, 4.5A BATTERY CHARGER WITH HIGH EFFICIENCY,
6-36 VIN, STEP-UP/DOWN DC/DC CONVERTER
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 DC1721A-A
SCHEMATIC DIAGRAM
dc1721aaf
9
DEMO MANUAL DC1721A-A
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
dc1721aaf
10 Linear Technology Corporation
LT 0611 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
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