Datasheet
LTC3557/LTC3557-1
11
35571fc
BLOCK DIAGRAM
NTC
19
V
NTC
15mV
18
V
BUS
WALL
CLPROG
27
6
5
7
OSC
REF
600mA, 2.25MHz
BUCK REGULATOR
V
IN1
3.3V
LDO
SW1
FB1
EN
MODE
4
LDO3V3
20
PROG
22
BAT
21
GATE
23
V
OUT
16
15
13
OSC
400mA, 2.25MHz
BUCK REGULATOR
V
IN2
SW2
FB2
EN
MODE
17
12
OSC
RST2
400mA, 2.25MHz
BUCK REGULATOR
SW3
FB3
35571 BD
EN
MODE
EN
LOGIC
BATTERY
TEMP
MONITOR
CHRG
28
CHARGE
STATUS
ILIM
LOGIC
CC/CV
CHARGER
WALL
DETECT
INPUT
CURRENT
LIMIT
14
GND
29
MODE
8
EN3
11
EN2
10
EN1
9
2
ILIM0
ILIM1
1
24
3
V
C
26
ACPR
25
V
C
CONTROL
+
–
+
–
IDEAL
DIODE