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(yè)數(shù)： 24/28頁(yè)
文件大?。?/td> 358K
代理商： LTC3456
24
LTC3456
3456f
Substituting V
OUT
= 1.8V, V
IN(MAX)
= 5.5V , L1 = 10
μ
H,
f = 1MHz in above equation gives:
=
(
10
)
μ
=
I
V
V
V
H
V
MHz
1
mA
L1
1 8
5 5
.
5 5
.
120
.
–1 8
L1 gives a reasonable value of ripple current when pow-
ered from both battery and USB or AC adapter.
The main output needs to be 3.3V and the maximum load
current is 200mA. Hot Swap current is derived from the
same main converter.
When powered from the 2 AA cell, the 3.3V output is
generated via the L2 boost inductor. The inductor current
ripple,
I
L2
, for Boost mode operation is given by:
=
(
)
I
V
V
V
)
V
f L
L
IN
OUT
(
IN
OUT
2
2
–
A reasonable starting value of inductor ripple current is
I
L2
= 150mA. Substituting V
OUT
= 3.3V, V
IN(MIN)
= 1.8V,
I
L2
= 150mA, f = 1MHz in above equation gives:
L
V
V
V
V
mA
MHz
1
H
2
1 8
3 3
.
3 3
150
5 4
.
=
(
)
=
μ
.
.
–1 8
We can choose a low resistance 4.7
μ
H, 650mA inductor
(Murata LQH32CN4R7M53).
When powered from the AC adapter or the USB, the 3.3V
output is generated via the L3 buck inductor. The inductor
current ripple (
I
L3
) for Buck mode operation is given by:
=
(
)
I
V
V
(
V
)
V
f L
L
OUT
IN
OUT
IN
3
3
–
A reasonable starting value of inductor ripple current is
I
L3
= 100mA. Substituting V
OUT
= 3.3V, V
IN(MAX)
= 5.5V,
I
L3
= 100mA, f = 1MHz in above equation gives:
L
V
V
V
mA
MHz
1
H
3
3 3
5 5
.
5 5
100
13 2
=
(
)
=
μ
.
.
–3 3
.
We can choose a 450mA, 10
μ
H inductor (Murata
LQH32CN100K53).
A 4.7
μ
F to 22
μ
F (X5R or X7R) ceramic output capacitor is
sufficient for most applications. They have a low ESR and
result in a low output ripple.
Figure 17 shows the complete circuit along with the
efficiency curves.
APPLICATIU
W
U
U
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