Datasheet

LTC3553
33
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
3 CELL
ALKALINE
OR LITHIUM
C1
10µF
20
U1
U2
16
1
19
5
2
6
7
3
4
PB1
8
13
9
10
12
11
17
18
14
15
R
PROG
1.87k
C4
4.7µF
C2
2.2µF
R
UP1
1M
R
UP2
590k
R
LO1
464k
2.5V
C5
10pF
R4
100k
R3
100k
C6
10µF
R
LO2
464k
1.8V
L1
10µH
SYSTEM LOAD
4.35V TO 5.5V
USB INPUT
LTC3553
I/O
CORE
PBSTAT
STBY
EN
SUSP
HPWR
3553 TA04
µC
+
C3
10µF
3-Cell Alkaline/Lithium With PowerPath (Charger Disabled)