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參數(shù)資料
| 型號(hào)： | LT3463 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Inverting Micropower DC/DC Converter with Schottky in ThinSOT Package |
| 中文描述： | 反向微功率DC / DC變換器的ThinSOT封裝的肖特基 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 150K |
| 代理商： | LT3463 |
6
LT3483
3483f
APPLICATIU
A capacitor in parallel with feedback resistor R1 is recom-
mended to reduce the output voltage ripple. Use a 5pF
capacitor for the inverting charge pump, and a 22pF value
for the inverting flyback or other dual inductor configura-
tions. Output voltage ripple can be reduced to 20mV in some
cases using this capacitor in combination with an appro-
priately selected output capacitor.
The output capacitor is selected based on desired output
voltage ripple. For low output voltage ripple in the inverting
flyback configuration, use a 4.7
μ
F to 10
μ
F capacitor. The
inverting charge pump utilizes values ranging from 0.22
μ
F
to 4.7
μ
F. The following formula is useful to estimate the
output capacitor value needed:
W
U
U
1
2
3
6
5
4
+
V
IN
GND
SHDN
C
FLY
C
OUT
3483 AI01
R1
L1
C
IN
V
OUT
Suggested Layout (SOT-23)
for Inverting Charge Pump
C
L I
V
V
OUT
SW
OUT
OUT
=
–
2
where I
SW
= 0.25A and
V
OUT
= 30mV. The flying capaci-
tor in the inverting charge pump configuration ranges
from 0.1
μ
F to 0.47
μ
F. Multiply the value predicted by the
above equation for C
OUT
by 1/10 to determine the value
needed for the flying capacitor.
Conditions that increase inrush current include a larger,
more abrupt voltage step at V
IN
, a larger flying capacitor,
and an inductor with a low saturation current.
While the internal diode is designed to handle such events,
the inrush current should not be allowed to exceed 1.5A.
For circuits that use flying capacitors within the recom-
mended range and have input voltages less than 5V,
inrush current remains low, posing no hazard to the
device. In cases where there are large steps at V
IN
, inrush
current should be measured to ensure operation within the
limits of the device.
Board Layout Considerations
As with all switching regulators, careful attention must be
given to the PCB board layout and component placement.
Proper layout of the high frequency switching path is
essential. The voltage signals of the SW and D pins have
sharp rising and falling edges. Minimize the length and
area of all traces connected to the SW and D pins. In
particular, it is desirable to minimize the trace length to
and from the flying capacitor, since current in this capaci-
tor switches directions within a cycle. Always use a
ground plane under the switching regulator to minimize
interplane coupling.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER
AVX
Kemet
Murata
Taiyo Yuden
URL
www.avxcorp.com
www.kemet.com
www.murata.com
www.tyuden.com
Setting the Output Voltage
The output voltage is programmed using one feedback
resistor according to the following formula:
R
V
10
A
OUT
μ
1
=
–
Inrush Current
When V
IN
is increased from ground to operating voltage,
an inrush current will flow through the input inductor and
integrated Schottky diode to charge the flying capacitor.
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| LT3463A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| LT3463AEDD | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3463AEDD#PBF | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3463AEDD#TR | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3463AEDD#TRPBF | 功能描述:IC REG INV ADJ 0.25A DL 10DFN 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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