Datasheet
LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
13
3554123fd
BLOCK DIAGRAM
0.8V
OSC
200mA STEP-DOWN DC/DC
EN
STBY
INPUT
CURRENT
LIMIT
CC/CV
CHARGER
BATTERY
TEMP
MONITOR
POWER GOOD
COMPARATORS
PUSH BUTTON
INTERFACE
2.25MHz/
1.125MHz
OSCILLATOR
CHARGE
STATUS
0.8V
OSC
V
BUS
V
OUT
BAT
PROG
SW1
FB1
BVIN
SW2
FB2
PGOOD
HPWR
SUSP
NTC
FSEL
EXTPWR UVLO
STBY
GND
3554 BD1
PWR_ON1
PWR_ON2
PBSTAT
ON
CHRG
200mA STEP-DOWN DC/DC
EN
STBY
20
18
17
16
13
6
12
11
7
4
1
19
15
14
2
10
21
9
8
3
5
÷
4096