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參數(shù)資料
| 型號(hào)： | LTC3456 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 2-Cell, Multi-Output DC/DC Converter with USB Power Manager |
| 中文描述： | 2節(jié)電池，多輸出DC / DC轉(zhuǎn)換器與USB電源管理器 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LTC3456 |
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21
LTC3456
3456f
Input Capacitor Selection
The LTC3456 can be powered from three different power
sources: battery, USB or the AC wall adapter. Choose a
4.7
μ
F or higher X5R or X7R type ceramic capacitor for
bypassing the input of LTC3456.
However, special care must be taken when bypassing the
USB and AC wall adapter inputs with ceramic capacitors.
Ceramic capacitors with their low ESR can form a resonant
tank circuit with the stray wiring inductance of the power
leads. This can cause large voltage transients at the input
of the device when the power is applied quickly (for
example, plugging the AC adapter output into the portable
device). This voltage spike can be large enough to damage
the LTC3456. A possible solution is to clamp the input
voltage or insert a small resistor in series with the ceramic
capacitor as shown in Figure 12. Please refer to Linear
Technology Application Note AN88 for more details.
APPLICATIU
W
U
U
Output Voltage Programming
The output of the core converter can be set by a resistor
divider according to the formula:
R
R
1
The external resistor divider is connected at the output as
shown in Figure 13. Choose 1% resistors for better
accuracy. R1 should be 80.6k or smaller for better noise
immunity.
V
V
CORE
=
+
0 8
.
1
2
Figure 12. Bypassing USB and AC Wall Adapter Inputs
Figure 13. Setting the Core Output Voltage
Figure 14. Setting the Wall Adapter UVLO Voltage
AC
ADAPTER
USB
INPUT
1
4.7
μ
F
1
4.7
μ
F
10
μ
F
3456 F12
USB
LTC3456
V
EXT
R1
R2
0.8V
≤
V
CORE
≤
V
BATT(MIN)
3456 F13
FB1
LTC3456
AGND
AC
ADAPTER
USB
POWER
R2
1
D1
R1
4.7
μ
F
10
μ
F
3456 F14
USB
WALLFB
EN
LTC3456
V
EXT
AC Adapter UVLO Voltage Programming
The AC wall adapter UVLO voltage can be set by a resistor
divider connected across the AC wall adapter as shown in
Figure 14.
The AC wall adapter UVLO voltage can be set by a resistor
divider according to the formula:
V
V
R
R
ADAPTER MIN
(
)
.
=
+
1 25
1
2
1
Choose 1% resistors for better accuracy. When the WALLFB
pin voltage is higher than 1.25V, the LTC3456 will be
powered from the V
EXT
pin. The internal USB power switch
is turned off and the power is derived from the AC adapter
through the diode D1. Ensure that the AC adapter UVLO
voltage is set high enough to make V
EXT
> 4V during
regular operation.
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