LTC3554-1_15 Datasheet, PDF (13/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

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