LTC3554 Datasheet, PDF (34/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

LTC3554
TYPICAL APPLICATION
4.35V TO 5.5V
USB INPUT
U1
20 _VBUS
V_OUT ¹⁸
15 _NTC
CHRG ¹⁴
1.74k
LTC3554
16 _PROG
BAT ¹⁷
R_PROG
1
19
HPWR
SUSP
BVIN ¹²
SYSTEM LOAD
C1
10μF
R1
CHRG
3 CELL
ALKALINE
OR LITHIUM
C2
2.2μF
9 _{PWR_ON1}
2
10
4
8
3
5
PB1
FSEL
STBY
PGOOD
PWR_ON2
PBSTAT
ON
GND
13 ^{L1 10μH}
SW1
C3
10pF
FB1 ⁶
L2
11 ^10μH
SW2
C5
10pF
7
FB2
2.5V
R_UP1
1M
R_LO1
464k
1.8V
R_UP2
590k
R_LO2
464k
C4
10μF
C6
10μF
R4
R2
R3
100k
100k
100k
U2
I/O
CORE
μC
PBSTAT
PGOOD
STBY
FSEL
EN
SUSP
HPWR
3554 F15
Figure 15. 3-Cell Alkaline/Lithium With PowerPath (Charger Disabled)
3554p
34