LTC1435
TYPICAL APPLICATIONS
U
Constant-Current/Constant-Voltage High Efficiency Battery Charger
E1
V
IN
+
C1*
22µF
35V
+
C2*
22µF
35V
C4
R7
C5
0.1µF
0.1µF
1.5M
C11
E3
GND
E3
56pF
1
2
3
4
5
6
7
8
16
Q1
SHDN
C
TG
C12
0.1µF
OSC
Si4412DY
C13
0.033µF
15
14
13
12
11
10
9
R5
1k
L1
27µH
R1
0.025Ω
RUN/SS BOOST
D1
E6
U1
I
TH
SW
BATT
C6
0.33µF
C14
1000pF
LTC1435
+
C3
22µF
35V
SFB
V
D2
IN
E7
GND
SGND INTV
CC
C9
100pF
Q2
Si4412DY
V
BG
OSENSE
–
SENSE
PGND
U2
LT1620
C15
0.1µF
+
SENSE EXTV
CC
C8
C10
100pF
100pF
1
8
7
6
5
C7
SENSE
AVG
4.7µF
+
2
3
4
16V
I
PROG
OUT
R2
1M
0.1%
GND
NIN
V
CC
PIN
R3
105k
0.1%
R4
76.8k
0.1%
C16
0.33µF
C18
0.1µF
JP1A
JP1B
R6
10k
1%
C17
0.01µF
DC133 F01
E5
GND
E4
PROG
*CONSULT CAPACITOR MANUFACTURER FOR RECOMMENDED
ESR RATING FOR CONTINUOUS 4A OPERATION
I
R
PROG
Current Programming Equation
(I
PROG
)(R6) – 0.04
10(R1)
I
=
BATT
Efficiency
100
95
V
IN
= 24V
V
= 16V
= 12V
BATT
V
BATT
90
V
= 6V
BATT
85
80
75
0
1
2
3
4
5
BATTERY CHARGE CURRENT (A)
1435 TA05
18
Linear [ Linear ]
