Datasheet

LTC3555/LTC3555-X
30
3555fd
TYPICAL APPLICATION
Watchdog Microcontroller Operation
18
+
2625
24
23
29
21
22
MP1
C2
22µF
10pF
Li-Ion
510Ω
TO OTHER
LOADS
1.02M
324k
RED
3.3V
400mA
1.61V TO 3.03V
400mA
MICROPROCESSOR
POR
0.8V TO 1.51V
1A
L1
3.3µH
SW
V
BUS
3
T
NTC
20
PROG
2
CLPROG
10k
17
L2
4.7µH
LTC3555/
LTC3555-X
SW1
191
FB1LDO3V3
8
DV
CC
9,10
16
7
13
27
28
2
I
2
C
V
OUT
BAT
GND
CHRG
GATE
1µF
1µF
2.2µF
10µF
V
IN1
5
10pF
1.02M
C1: MURATA GRM21BR61A106KE19
C2: TDK C2012X5R0J226M
L1: COILCRAFT LPS4018-332LM
L2, L3: TOKO 1098AS-4R7M
L4: TOKO 1098AS-2R0M
MP1: SILICONIX Si2333
365k
6
L3
4.7µH
SW2
4
FB2
I/O
CORE
10µF
V
IN2
EN1
EN2
EN3
ILIM0
ILIM1
11
10pF
715k
806k
12
L4
2µH
SW3
14
FB3
22µF
3555 TA02
V
IN3
15
RST3
MEMORY
3k
2k
0.1µF
8.2Ω
C1
10µF
USB/WALL
4.5V TO 5.5V
1µF
PUSH BUTTON
MICROCONTROLLER
10k