LTC3553-2_15 Datasheet, PDF (33/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger, Always-On LDO and Buck Regulator

TYPICAL APPLICATIONS
LTC3553-2
USB PowerPath With Li-Ion Battery (NTC Qualified Charging)
4.35V TO 5.5V
USB INPUT
R1
100k
R2
100k
20
C3
10μF
15
V_BUS
NTC
V_OUT ¹⁸
CHRG ¹⁴
T
R_PROG
1.87k
LTC3553-2
16 _PROG
BAT ¹⁷
1 _HPWR
19 _SUSP
BVIN ¹²
V_INLDO ¹¹
SYSTEM LOAD
C1
10μF
R3
+ _Li-Ion
BATTERY
C2
2.2μF
2 _PGOOD
10
LDO
6 _STBY
LDO_FB ⁹
7 _{BUCK_ON}
3 _PBSTAT
L1
13 ^10μH
SW
4 _ON
PB1
C5
10pF
8
BUCK_FB
GND
3.3V
RUP1
2.05M
R_LO1
649k
C4
4.7μF
1.2V
RUP2
332k
R_LO2
649k
C6
10μF
LDO
1.8V
EN
MEMORY
I/O
CORE
μC
R4
100k
R3
100k
PBSTAT
PGOOD
BUCK_ON
STBY
SUSP
HPWR
35532 TA02
35532f
33