参数资料
型号: LTC3456EUF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: ECONOLINE: RSZ/P - 1kVDC
中文描述: 0.9 A BATTERY CHARGE CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24
封装: 4 X 4 MM, PLASTIC, MO-220-WGGD, QFN-24
文件页数: 13/28页
文件大小: 358K
代理商: LTC3456EUF
13
LTC3456
3456f
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
V
EXT
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
OPERATIOU
17
+
HSO
R
1.25V
V
OS
WALL_RDY
V
MAIN
Hot Swap OUTPUT
3.3V
50mA
1
μ
F
3456 F03
16
MAIN OUTPUT
3.3V
150mA
V
3.3V
1
μ
F
SW2_BK
13
V
INT
15
WALLFB
22
μ
F
10
μ
F
10
μ
F
D1
4.32k
BUCK 2
LTC3456
CORE OUTPUT
1.8V
200mA
SW1
V
EXT
4V
EN
V
EXT
5
9
BUCK 1
L1
10
μ
H
L3
10
μ
H
+
7
11.3k
AC
ADAPTER
5V
±
5%
+
Figure 3. AC Adapter-Powered LTC3456
will draw all its power from the AC adapter via the V
EXT
pin.
The WALLFB voltage should always be kept below 2V.
When enabled, the onboard voltage detector checks the
status of the V
EXT
voltage. If the V
EXT
pin voltage is greater
than 4V, the V
INT
, Core output, Main output and Hot Swap
outputs power-up in that sequence.
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