LTC3555 Datasheet, PDF (13/32 Pages) Linear Technology – High Effi ciency USB Power Manager + Triple Step-Down DC/DC

BLOCK DIAGRAM
LTC3555/LTC3555-X
V_BUS 25
CLPROG 2
NTC 3
CHRG 21
2.25MHz
PowerPath
SWITCHING
REGULATOR
SUSPEND
LDO
500μA
–
+
BATTERY
TEMPERATURE
MONITOR
1.188V
CHARGE
STATUS
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
ENABLE
400mA 2.25MHz
SWITCHING
REGULATOR 1
18 V_IN1
17 SW1
19 FB1
I_LIM0 27
I_LIM1 28
EN1 16
EN2 7
EN3 13
DV_CC 8
SDA 10
SCL 9
I_LIM
DECODE
LOGIC
D/A
4
D/A
ENABLE
400mA 2.25MHz
SWITCHING
REGULATOR 2
ENABLE
1A 2.25MHz
SWITCHING
REGULATOR 3
4
5 V_IN2
6 SW2
4 FB2
11 V_IN3
12 SW3
14 FB3
15 RST3
I²C PORT
29
GND
3555 BD
3555fd
13