Datasheet

LTC3553
32
3553fb
TYPICAL APPLICATIONS
V
BUS
NTC
PROG
HPWR
SUSP
LDO_ON
SEQ
STBY
BUCK_ON
PBSTAT
ON
V
OUT
CHRG
BAT
BVIN
V
INLDO
LDO
LDO_FB
SW
BUCK_FB
GND
Li-Ion
BATTERY
C1
10µF
C3
10µF
R3
R1
100k
20
16
1
19
5
2
6
7
3
4
PB1
8
13
9
10
12
11
17
18
14
15
R
PROG
1.87k
T
C4
4.7µF
C2
2.2µF
R
UP1
R
UP2
2.05M
R
LO1
649k
3.3V
LDO
1.8V
C5
10pF
C6
10µF
332k
R
LO2
649k
1.2V
L1
10µH
SYSTEM LOAD
4.35V TO 5.5V
USB INPUT
LTC3553
I/O
CORE
PBSTAT
BUCK_ON
STBY
LDO_ON
SUSP
HPWR
3553 TA02
µC
MEMORY
EN
R2
100k
R3
100k
+
USB PowerPath With Li-Ion Battery (NTC Qualifi ed Charging)