LTC3556 Datasheet, PDF (13/36 Pages) Linear Technology – High Effi ciency USB Power Manager with Dual Buck and Buck-Boost DC/DCs

BLOCK DIAGRAM
LTC3556
V_BUS 25
CLPROG 2
NTC 3
CHRG 21
PGOODALL 15
SEQ 27
ENALL 28
DV_CC 10
SDA 16
SCL 13
2.25MHz
PowerPath
SWITCHING
REGULATOR
SUSPEND
LDO
500μA
–
+
BATTERY
TEMPERATURE
MONITOR
1.188V
CHARGE
STATUS
4
3.3V LDO
26 SW
1 LDO3V3
24 V_OUT
CC/CV
CHARGER
0₊.3_–V
IDEAL
+–
+
–
15mV
22 GATE
23 BAT
3.6V
20 PROG
EN1
400mA
2.25MHz
D/A
(BUCK)
SWITCHING
REGULATOR 1
5 V_IN1
4 SW1
6 FB1
POWER
GOOD
MASTER LOGIC
AND
SEQUENCER
EN2
400mA
2.25MHz
(BUCK)
SWITCHING
REGULATOR 2
EN3
D/A
4
1A
2.25MHz
(BUCK-BOOST)
SWITCHING
REGULATOR 3
I²C PORT
18 V_IN2
19 SW2
17 FB2
11 V_IN3
A
9 SWAB3
B
12 V_OUT3
D
14 SWCD3
C
7 FB3
8 V_C3
29
GND
3556 BD
3556f
13