- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377682 > LT1110-12 (Linear Technology Corporation) Micropower DC-DC Converter Adjustable and Fixed 5V, 12V PDF資料下載
參數(shù)資料
| 型號： | LT1110-12 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| 中文描述： | 微功率DC - DC轉(zhuǎn)換可調(diào)和固定5V，12V的 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 310K |
| 代理商： | LT1110-12 |
LT1110
9
switch closes, current in the inductor builds according to
I
V
R
e
L
L
'
L
+
( )
=
–
(
)
–Rt
1
15
where R' = 0.65
+ DCR
L
V
L
= V
IN
– 0.75V
As an example, suppose –5V at 75mA is to be generated
from a 4.5V to 5.5V input. Recalling Equation (14),
(
Energy required from the inductor is
P
f
kHz
OSC
70
Picking an inductor value of 56
μ
H with 0.2
DCR results
in a peak switch current of
)
+
(
Substituting I
PEAK
into Equation (04) results in
P
V
V
mA
mW
L
=
+
)(
)
=
|
|
.
.
(
)
5
0 5
75
413
16
mW
J
L
=
=
413
5 9
.
17
(
.
)
μ
I
V
V
e
mA
PEAK
s
H
=
(
)
=
4 5
.
–0 75
0 65
.
0 2
.
1
621
18
(
0 85
– .
10
56
–
.
)
μ
μ
E
H
A
J
L
=
(
)(
)
=
1
2
56
0 621
.
10 8
19
(
2
μ
μ
.
.
)
Since 10.8
μ
J > 5.9
μ
J, the 56
μ
H inductor will work.
With this relatively small input range, R
LIM
is not usually
necessary and the I
LIM
pin can be tied directly to V
IN
. As in
the step-down case, peak switch current should be limited
to ~800mA.
Capacitor Selection
Selecting the right output capacitor is almost as important
as selecting the right inductor. A poor choice for a filter
capacitor can result in poor efficiency and/or high output
ripple. Ordinary aluminum electrolytics, while inexpensive
and readily available, may have unacceptably poor Equiva-
lent Series Resistance (ESR) and ESL (inductance). There
are low ESR aluminum capacitors on the market specifi-
cally designed for switch mode DC-DC converters which
work much better than general-purpose units. Tantalum
capacitors provide still better performance at more ex-
pense. We recommend OS-CON capacitors from Sanyo
Corporation (San Diego, CA). These units are physically
quite small and have extremely low ESR. To illustrate,
Figures 1, 2 and 3 show the output voltage of an LT1110
based converter with three 100
μ
F capacitors. The peak
switch current is 500mA in all cases. Figure 1 shows a
Sprague 501D, 25V aluminum capacitor. V
OUT
jumps by
over 120mV when the switch turns off, followed by a drop
in voltage as the inductor dumps into the capacitor. This
works out to be an ESR of over 240m
. Figure 2 shows the
same circuit, but with a Sprague 150D, 20V tantalum
capacitor replacing the aluminum unit. Output jump is
now about 35mV, corresponding to an ESR of 70m
.
Figure 3 shows the circuit with a 16V OS-CON unit. ESR is
now only 20m
.
5 s/DIV
5
LT1110 TA19
Figure 1. Aluminum
5 s/DIV
5
LT1110 TA20
Figure 2. Tantalum
5 s/DIV
μ
5
LT1110 TA21
Figure 3. OS-CON
U
S
A
O
PPLICATI
IU
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1110-5 | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| LT1110CN8-5 | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| LT1110CS8 | Dual 4-Input Positive-NAND Gates 14-SOIC 0 to 70 |
| LT1110CS8-12 | Dual 4-Input Positive-NAND Gates 14-SSOP 0 to 70 |
| LT1110CS8-5 | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1110-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| LT1110CN8 | 功能描述:IC REG BUCK BOOST ADJ 0.4A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1110CN8#PBF | 功能描述:IC REG BUCK BOOST ADJ 0.4A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1110CN8-12 | 功能描述:IC REG BUCK BOOST 12V 0.4A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LT1110CN8-12#PBF | 功能描述:IC REG BUCK BOOST 12V 0.4A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。