LTC3456_15 Datasheet, PDF (11/28 Pages) Linear Technology – 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

LTC3456
BLOCK DIAGRA
USB
USB
10
4.7µF
1Ω
4V
+–
R
–
+^VOS
EN
AC
ADAPTER
V_EXT
AO
USB
CONTROLLER
11.3k
4.32k
D1
1k
D2
SUSPEND
18
USBHP
12
WALLFB +
7
–
1.25V
EXT_PWR
8
10µF
V_EXT
9
AO
2
USB
CONTROL
LOGIC
USB_RDY
0.8V
V_BATT
80.6k
100k
4.7µF
AIN
1
V_BATT
4
L1
V_CORE
10µH
SW1
5
DRV
220pF 100k
FB1
24
10µF
80.6k
–
0.8V +
USB
V_EXT
V_INT
V_BATT
PowerPath
CONTROLLER
V_MAX
11
1µF
+
4V –
V_{EXT_RDY}
PWRKEY
19
PBSTAT
20
START-UP
LOGIC
TURN-ON
SWITCHERS
262ms
TIMER
PWRON
21
MODE
22
RESET
23
HSO
17
HSO
R_–
1µF
V_EXT
+^VOS
PSWITCH
200k 625k
–
0.8V +
DRV
V_MAIN
16
V_INT
15
SW2_BST
14
1µF
L2
4.7µH
V_MAIN
V_BATT
4.7µF
SW2_BK
13
L3
10µH
AGND 3
PGND 6
3456 F01
V_INT
22µF
Figure 1. LTC3456 Block Diagram
3456fa
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