LTC3441 Linear Technology, LTC3441 Datasheet - Page 9

• Manufacturer Part Number: LTC3441
• Description: Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
• Manufacturer: Linear Technology

BLOCK DIAGRA
V
3.3V to 4.2V
MAX
CONTROLLER
V
4.7 F
C
USB
BAT
LBO
ON/OFF
USB 5V
0.1 F
2.49k
2.43M
806k
1k
806k
806k
SUSPEND
1.8V
PBSTAT
1.8V
PWRON
1
USBHP
TIMER
MODE
CHRG
PROG
HSON
4.7 F
GND
V
USB
ON2
RST
BAT
ON
AO
AI
25
16
17
24
23
22
19
20
21
15
8
6
5
4
3
2
9
200ms RESET PULSE
BURST MODE ENABLE
W
USB POWER MANAGER
V
–
+
3.0V
BAT
REF
4R
R
1
+
–
1000
–
+
UVLO
0.8V
3.9V
CONTROL
CHARGE
BATTERY CHARGER
–
+
–
+
+
EXTPWR
1.23V
1
2.41R
1000
R
BATTERY PMOS SWITCH
ENABLE
DRIVER
DRIVER
PWM
PWM
HOT SWAP
ENABLE
ENABLE
SWITCHER 1
SWITCHER 2
EXTPWR
–
+
–
+
+
–
0.8V
0.8V
1.23V
3455 BD01
11
10
12
18
13
14
7
1
WALLFB
V
SW1
FB1
SW2
FB2
HSI
HSO
MAX
3.32k
1.24k
4.7 H
4.7 H
LTC3455
80.6k
80.6k
100k
249k
1
1 F
10 F
10 F
10 F
1 F
WALL 5V
V
1.8V
3.3V, HS
MAX
9
3455f
3.3V