Datasheet

13
LTC1473
TYPICAL APPLICATIONS
U
R
SENSE
0.015Ω
Q1
Si4412DY
C4
0.1µF
D1
CMDSH-3
C3
4.7µF
16V
D2
MBRS140T3
C
IN
22µF
35V
× 2
C
OUT
100µF
10V
× 3
V
OUT
5V/3.5A
Q2
Si4412DY
+
+
R1
105k
1%
L1*
10µH
SGND
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
C1
100pF
C5
1000pF
C
SS
, 0.1µF
C
C2
, 51pF
C
OSC
57pF
R
C
, 10k
C
C
330pF
+
C6
100pF
C2, 0.1µF
R2
20k
1%
4700pF
C
TIMER
C7
1µF
C8
1µF
GND
SW
BOOST
GND
GND
UV
GND
OVP
CLP
CLN
COMP1
SENSE
GND
GND
V
CC1
V
CC2
V
CC3
PROG
V
C
UVOUT
GND
COMP2
BAT
SPIN
LT
®
1511
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
DCIN
OUT A
V
–
IN
+
A
IN
–
B
OUT B
V
+
REF
HYST
LTC1442
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
1
2
3
4
8
7
6
5
74C00
12
3
4
5
6
13
12
11
14
MMBD2838LT1
D5
MBRD340
C11
0.47µF
D6
MBR0540T
D4
MBRD340
L3***
20µH
2,3
1,4
C10
1µF
R13
5.1k
1%
R12
3k
1%
C16
220pF
R
SENSE
0.033Ω
R20
395k
0.1%
R21
164k
0.1%
C17
10µF
8.4V
Li-Ion
BATTERY
R19
200Ω
1%
R15
1k
C15
0.33µF
R16
300Ω
C14
1µF
R17
4.93k
C12
10µF
C13
10µF
R
SENSE
0.033Ω
R14
510Ω
R6
900k
1%
R7
130k
1%
R9
113k
1%
R8
427k
1%
R10
50k
1%
R11
1132k
1%
C9
0.1µF
R5
500k
7
L2**
1mH
R18, 200Ω, 1%
1473 TA03
*SUMIDA CDRH125-10
**COILCRAFT 1812LS-105XKBC
***COILTRONICS CTX20-4
10
9
8
Si9926DY
R
SENSE
0.033Ω
IN1
IN2
DIODE
TIMER
V
+
V
GG
SW
GND
GA1
SAB1
GB1
SENSE
+
SENSE
–
GA2
SAB2
GB2
LTC1473
Si9926DY
D3
6.8V
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
C
OSC
RUN/SS
I
TH
SFB
SGND
V
OSENSE
SENSE
–
SENSE
+
LTC1735
8
+
V
OUT
Complete Front End Including Battery Charger and DC/DC Converter with Automatic Switchover Between Battery and DCIN