LTC3553_15 Datasheet, PDF (32/36 Pages) Linear Technology – Micropower USB Power Manager With Li-Ion Charger, LDO and Buck Regulator

LTC3553
TYPICAL APPLICATIONs
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
16 _PROG
BAT ¹⁷
1 _HPWR
19 _SUSP
BVIN ¹²
V_INLDO ¹¹
SYSTEM LOAD
C1
10µF
R3
+ _Li-Ion
BATTERY
C2
2.2µF
5 _{LDO_ON}
10
LDO
2 _SEQ
LDO_FB ⁹
6 _STBY
L1
7 _{BUCK_ON}
13 ^10µH
SW
3 _PBSTAT
C5
10pF
PB1 ^{4 ON}
BUCK_FB ⁸
GND
3.3V
RUP1
2.05M
R_LO1
649k
C4
4.7µF
1.2V
RUP2
332k
R_LO2
649k
C6
10µF
R3
100k
LDO
1.8V
EN
I/O
MEMORY
CORE
µC
PBSTAT
BUCK_ON
STBY
LDO_ON
SUSP
HPWR
3553 TA02
3553fc
32