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参数资料
| 型号： | LT3483EDC |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.23 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-8 |
| 文件页数： | 10/12页 |
| 文件大小： | 875K |
| 代理商： | LT3483EDC |
LT3483/LT3483A
7
3483fc
APPLICATIONS INFORMATION
value recommended, as too large of an inductance will
increasetheoutputvoltageripplewithoutprovidingmuch
additional output current.
Table 1. Recommended Inductors
PART
L
(H)
MAX
IDC
(mA)
DCR
(Ω)
HEIGHT
(mm)
MANUFACTURER
LQH2MCN4R7M02L
LQH2MCN6R8M02L
LQH2MCN100M02L
4.7
6.8
10
300
255
225
0.84
1.0
1.2
0.95
Murata
www.murata.com
SDQ12
Coupled
Inductor
4.7
10
15
1.45
980
780
0.40
0.72
1.15
1.2
Cooper Electronics
Tech
www.cooperet.com
LPD3015
Coupled
Inductor
4.7
10
860
580
0.52
1.0
1.4
Coilcraft
www.coilcraft.com
Capacitor Selection
The small size and low ESR of ceramic capacitors make
them ideal for LT3483/LT3483A applications. Use of X5R
and X7R types is recommended because they retain their
capacitance over wider voltage and temperature ranges
than other dielectric types. Always verify the proper volt-
age rating. Table 2 shows a list of several ceramic capaci-
tor manufacturers. Consult the manufacturers for more
detailed information on their entire selection of ceramic
capacitors.
A 4.7F ceramic bypass capacitor on the VIN pin is rec-
ommended where the distance to the power supply or
battery could be more than a couple inches. Otherwise,
a 1F is adequate.
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
appropriately selected output capacitor.
The output capacitor is selected based on desired output
voltageripple.Forlowoutputvoltagerippleintheinverting
flyback configuration, use a 4.7F to 10F capacitor. The
inverting charge pump utilizes values ranging from 0.22F
to 4.7F. The following formula is useful to estimate the
output capacitor value needed:
COUT =
L ISW
2
–VOUT VOUT
where ISW = 0.25A (LT3483) or ISW = 0.5A (LT3483A) and
VOUT=30mV. Theflyingcapacitorintheinvertingcharge
pump configuration ranges from 0.1F to 0.47F. Multiply
the value predicted by the above equation for COUT by 1/10
to determine the value needed for the flying capacitor.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER
URL
AVX
www.avxcorp.com
Kemet
www.kemet.com
Murata
www.murata.com
Taiyo Yuden
www.tyuden.com
Setting the Output Voltage
The output voltage is programmed using one feedback
resistor according to the following formula:
R1
= –
VOUT
10
A
Inrush Current
When VIN 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.
Conditions that increase inrush current include a larger,
more abrupt voltage step at VIN, 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 VIN, inrush current
should be measured to ensure operation within the limits
of the device.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3483EDC#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER INVERTING ADJ DFN-8 制造商:Linear Technology 功能描述:DC-DC CONVERTER, INVERTING, ADJ, DFN-8 制造商:Linear Technology 功能描述:DC-DC CONVERTER, INVERTING, ADJ, DFN-8, Primary Input Voltage:16V, No. of Outputs:1, No. of Pins:8, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited, Package / Case:8-DFN , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape Micropower Inverting Boost |
| LT3483EDC#TRMPBF | 功能描述:IC REG INV ADJ 0.2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3483EDC#TRPBF | 功能描述:IC REG INV ADJ 0.2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3483EDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Inverting Micropower DC/DC Converter with Schottky |
| LT3483EDC-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Inverting Micropower DC/DC Converter with Schottky |
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