DC1721A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
REV
__
Q6
Si7135DP
VOUT
ROFB1
1.00M
R51
0
C35
0.01uF
F1
6.3A
26
VIN+
22
E17
GND
NTC
CNTC
OPT
10
BIAS
OPT
R38
OPT
2
BIAS
CLN
E14
1 D8
9
R20
D9
BZX84C3V0
BIAS
1
FLT
GND
GND
6
24
CL
28
GND
R39
OPT
J5
TMR
CCX
OPT
RCX
10K
NOT ON THE BOARD
CBIAS
1uF
10V
IBMON
CIBMON
1000pF
CIIMON
1000pF
E10
IIMON
JP1
LED2
R46
2.2K
INTVCC
GRN
3
1
4
E13
E12
C33
4.7uF
10V
E11
B
2
R47
4.7K
BIAS
RED
BIAS
2
RNTC2
10K
6
R50
20K
R44
38.3K
+
-
3
OUT
8
1
OPTIONAL THERMAL PROTECTION FOR Q6
DURING VOUT-SYS SHORT CIRCUIT
R45
1.00M
HYST
6 REF
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.
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
AK
DAVID B.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
14.6V, 5A BATTERY CHARGER WITH HIGH EFFICIENCY,
6-36 VIN, STEP-UP/DOWN DC/DC CONVERTER
SIZE
THERMAL REGULATION FOR Q7
DURING 'INSTANT-ON' OPERATION
4
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
2
IN-
NOTE: UNLESS OTHERWISE SPECIFIED
Q8
2N7002L
GND
5
6 REF
IN+
V+
7
4
R59
1.00M
5
3
HYST
V-
R57
20K
Q9
2N7002L
1
NTC
1
6
R58
38.3K
8
V-
RNTC3
10K
IN-
OUT
U3
LTC1540CMS8
R49
100K
2
5
+
-
R48
10K
2
4
IN+
GND
3
V+
7
R56
68.1K
IL
3
U4
LTC1540CMS8
1
R55
10K
3
2
2
3
CHRG
RCL
24K
RIL
18.2K
DISABLE
B
4
IL
TMR
5
IL
CTMR
0.1uF
CHARGE
ENABLE
IBMON
TMR
1
RVM2
10K
CX
2
IIMON
27
7
CHRG
8
RVM1
36.5K
25
CIN
1uF
50V
1210
VIN+
ENC
VM
IN
FLT
C
23
1
C
A
BAT
14.6V / 5A
NTC
LTC4000EGN
VIN
D
11
U2
RST
05-11-11
NTC
FBG
12
BAT
BFB
13
14
15
17
CSN
BGATE
ITH
DATE
DAVID B.
GND
J4
CBAT
2.2uF
25V
0805
RBFB2
84.5K
RBFB1
1.00M
RUN
FROM PAGE 2
E15
E20
R42 OPT
ROFB2
84.5K
OFB
IID
CC
20
7
6
5
8
APPROVED
VOUT-SYS
15V
6.25A LIMIT
J3
E18
16
0.1uF
3
2
1
R43 OPT
CSP
14.7K
R52
0
R53
OPT
18
CC2
19
RC1
RCS
10m
3
2
1
4
CC1
OPT
21
D
7
6
5
8
IGATE
R54
0
CL
2.2uF
25V
0805
Q7
Si7135DP
4
ITH
DESCRIPTION
PRODUCTION
2
N/A
SCALE = NONE
2
DATE:
IC NO.
REV.
LTC4000EGN, LTC3789EGN
DEMO CIRCUIT 1721A
Wednesday, June 08, 2011
2
SHEET 1
1
OF 2
A
5
4
3
2
1
INTVCC
E3
R7
100K
E4
VIN
VOS+
D
PGOOD
RFB2
8.06K
E6
RFB1
154K
EXTVCC
CF
OPT
R41
OPT
INTVCC
C15
1uF
50V
INTVCC
R5
15
0805
CIN3
OPT
Q2
SiR422DP
2
4
5
3
CCM
VOUT
PLLIN
E8
R24
10K
R14
100
VIN
C34
10nF
R13
100
C19
1.0nF
6
7
R21 121K 1%
8
9
C7
BIAS
RUN
R30
OPT
OPT
C8
11
OPT
12
INTVCC
13
R22
OPT
B
10
R25
0
C10
2.2uF
14
TG1
SENSE1ITH
BOOST1
PGND1
SGND
BG1
MODE/PLLIN
VIN
FREQ
INTVCC
RUN
EXTVCC
VINSNS
BG2
VOUTSNS
ILIM
BOOST2
TG2
IOSENSE+
+
CIN2
56uF
50V
SW2
IOSENSE-
NC
1
2
3
C4
0.22uF
16V
26
25
R11
10
24
E1
22
INTVCC
20
C24
1uF
4
18
D5
B240A
4
3
C22
0.22uF
16V
17
Q5
SiR496DP
BG1
1206
D7
DFLS160
19
D2
BAS16
VOUT1
2
1
D10
BZT52C5V6
Q10
OPT
(FZT603)
GND
COUT1
150uF
D6 20V
B240A
+
C1
C2
C16
C17
22uF
25V
1210
0.008
2%
C3
C23
OPT
16V
1210
COUT2
+ 150uF
R8
10
VOS+
20V
C
C13
1.8nF
1206
R29
3.6
1206
1
BG2
R1
5.6
TG2
16
15
GND
4.7uH
C18
10uF
21
D
VIN+
VOUT
L1
Q4
SiR422DP
D4
DFLS160
23
J1
R2
1
2
3
SW1
SENSE1+
1
R10
SS
Q3 VOUT1
SiR496DP
4
27
2
C11
1.24K
OPT
R60 10.0K ITH
CIN1
56uF
50V
J2
C12
390pF
1206
8
5
6
7
MODE
JP2
3
+
1
2
3
1.24K
R9
PGOOD
1
1
PULSE
SKIP
C
2
VFB
28
2
CSS
0.022uF
INTVCC
R28
5.6
1206
4
1
2
E7
VIN
6V - 36V
11A LIMIT
E2
U1
LTC3789EGN
1
SS
C5
C6
3.3uF
50V
1210
0.004
2%
TG1
8
5
6
7
C14
0.1uF
C9
C25
3.3uF
50V
1210
C26
C27
OPT
CIN4
OPT
+
ITH
R40
OPT
SW1
CF1
OPT
+
1
2
3
E5
SGND
VIN+
R20
R27
OPT
8
5
6
7
VLOGIC
8
5
6
7
INTVCC
R61
OPT
(10K)
D11
1 OPT
10V
2 (MM3Z10VT1)
SW2
CS
B
R18
8m
2%
EXTVCC
EXTVCC
R6
E9
R12
R4
R3
OPT
OPT
100
100
<------
------>
CUSTOMER NOTICE
A
CIRCUITRY ON THIS
SIDE MUST CONNECT
TO SIGNAL GND
GROUNDPLANE
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.
CIRCUITRY ON THIS
SIDE MUST CONNECT
TO POWER GND
GROUNDPLANE
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
AK
DAVID B.
TITLE: SCHEMATIC
14.6V, 5A BATTERY CHARGER WITH HIGH EFFICIENCY,
6-36 VIN, STEP-UP/DOWN DC/DC CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
N/A
SCALE = NONE
2
DATE:
IC NO.
LTC4000EGN, LTC3789EGN
DEMO CIRCUIT 1721A
Wednesday, June 08, 2011
SHEET 2
1
REV.
2
OF 2
A
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