LTC3553-2_15 Datasheet, PDF (34/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

LTC3553-2
TYPICAL APPLICATIONS
4.35V TO 5.5V
USB INPUT
3-Cell Alkaline/Lithium With PowerPath (Charger Disabled)
20
C3
10μF
15
U1
V_BUS
NTC
V_OUT ¹⁸
CHRG ¹⁴
R_PROG
10k
16
LTC3553-2
PROG
BAT ¹⁷ ₊
SYSTEM LOAD
C1
10μF
3 CELL
ALKALINE
OR LITHIUM
1 _HPWR
BVIN ¹²
19 _SUSP
V_INLDO ¹¹
C2
2.2μF
U2
10
LDO
2
PGOOD
LDO_FB ⁹
6 _STBY
L1
7 _{BUCK_ON}
13 ^10μH
SW
3 _PBSTAT
C5
10pF
PB1 ^{4 ON}
8
BUCK_FB
GND
2.5V
R_UP1
1M
R_LO1
464k
C4
4.7μF
1.8V
R_UP2
590k
R_LO2
464k
C6
10μF
I/O
CORE
μC
R4
R5
R3
100k
100k
100k
PBSTAT
PGOOD
STBY
EN
SUSP
HPWR
35532 TA04
35532f
34