Datasheet

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
33
3554123fd
TYPICAL APPLICATION
V
BUS
NTC
PROG
HPWR
SUSP
PWR_ON1
FSEL
STBY
PGOOD
PWR_ON2
PBSTAT
ON
V
OUT
CHRG
BAT
BVIN
SW1
FB1
SW2
FB2
GND
3 CELL
ALKALINE
OR LITHIUM
C1
10µF
20
U1
U2
16
1
19
9
2
10
4
8
3
5
PB1
7
11
6
13
12
17
18
1415
R
PROG
1.87k
C3
10pF
C4
10µF
C2
2.2µF
R
UP1
1M
R
UP2
590k
R
LO1
464k
2.5V
L1 10µH
C5
10pF
R4
100k
R2
100k
R3
100k
C6
10µF
R
LO2
464k
1.8V
L2
10µH
SYSTEM LOAD
4.35V TO 5.5V
USB INPUT
LTC3554
I/O
CORE
PBSTAT
PGOOD
STBY
FSEL
EN
SUSP
HPWR
3554 F14
µC
+
Figure 14. 3-Cell Alkaline/Lithium with PowerPath (Charger Disabled)