DC1977A - Schematic

4
3
2
1
REVISION HISTORY
ECO
REV
-
3
D1
E1
DESCRIPTION
APPROVED
DATE
GEORGE B.
7 - 9- 14
PRODUCTION FAB
PV+
DFLS240L
E2
4
E11
VIN +
VIN
C4
10µF
50V
1210
4.4V - 40V
0.4A
R3
261k
R1
787k
PV- or Vin-
E3
4.4V - 40V
R2
121k
RUN
R4
ENABLED
DISABLED
324k
E10
R15
100k
5%
U1
LTC4121EUD-4.2 / LTC4121EUD
GND
E9
3
JP2
16
IN
RUN
FAULT
CHRG
4
15
14
E8
FAULT
CHRG
INTVCC
MPPT
INTVCC
JP1
INTVcc
BOOST
ON
OFF
FREQ
R5
3
1.5 MHz
10.0k 750 kHz
7
FREQ
sw
JP3
6
MPPT
BAT
E4
12
C3
0.022µF
25V
4
R14
5.1k
5%
C5
2.2µF
20%
6.3V
3
R13
47k
5%
L1
33.0uH
CHGSNS
NTC
1
2
8
E5
PROG
13
NTC
C2*
C1
BATSNS/FB
PROG
NC/FBG
GND
R7
3.01k
BAT
2.7V - 18V
E6 400mA
GND
M1
Si2343DS
*
10
R6
2.0k 5%
E7
R12 TO BE CONNECTED TO C2 & C3
9
5
R11 *
11
R12 *
J1 OPT
DF3-3P-2DSA
EPAD
17
1
2
3
2
BAT
GND
ENTC
2
R10
0 Ohm
JUMPER
NTC
JP4
INT
R8
0 Ohm
JUMPER
EXT
*
ASSY
-A
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
R9
10.0k
-B
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
R11
R12
C1
C2
OPEN
0 Ohm
47µF/16V
OPEN
LTC4121EUD
1.40M
1.05M
22µF/25V
22µF/25V
APPROVALS
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.
1
U1
LTC4121EUD - 4.2
2
TECHNOLOGY
NC
GEORGE B.
TITLE: SCHEMATIC
40V 400mA SYNCHRONOUS STEP-DOWN
BATTERY CHARGER
SIZE
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
REV.
LTC4121EUD - 4.2 / LTC4121EUD
DEMO CIRCUIT 1977A - A / B
7 - 9- 14
SHEET
1
3
1
OF
1
1
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