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LTC3456 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3456
Description  2-Cell, Multi-Output DC/DC Converter with USB Power Manager
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3456 Datasheet(HTML) 13 Page - Linear Technology

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LTC3456
3456fa
AC Wall Adapter Powered
The LTC3456 can be powered off the AC wall adapter as
shown in Figure 3. The wall adapter is connected to the
VEXT pin via the diode D1.
The status of the AC wall adapter power is monitored
through the WALLFB pin. The nominal voltage at this pin
is 1.25V. When the pin voltage is higher than 1.25V, the IC
OPERATIO
17
HSO
R
1.25V
VOS
WALL_RDY
VMAIN
Hot Swap OUTPUT
3.3V
50mA
1
µF
3456 F03
16
MAIN OUTPUT
3.3V
150mA
VINT
3.3V
1
µF
SW2_BK
13
VINT
15
WALLFB
22
µF
10
µF
10
µF
D1
4.32k
BUCK 2
LTC3456
CORE OUTPUT
1.8V
200mA
SW1
VEXT
4V
EN
VEXT
5
9
BUCK 1
L1
10
µH
L3
10
µH
7
11.3k
AC
ADAPTER
5V
±5%
Figure 3. AC Adapter-Powered LTC3456
will draw all its power from the AC adapter via the VEXT pin.
The WALLFB voltage should always be kept below 2V.
When enabled, the onboard voltage detector checks the
status of the VEXT voltage. If the VEXT pin voltage is greater
than 4V, the VINT, Core output, Main output and Hot Swap
outputs power-up in that sequence.



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