参数资料
| 型号： | LT3483AIDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV ADJ 0.4A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 -38V |
| 输入电压： | 2.5 V ~ 16 V |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（2x2） |
LT3483/LT3483A
APPLICATIONS INFORMATION
L ? I SW 2
–V OUT ? ? V OUT
value recommended, as too large of an inductance will
increase the output voltage ripple without providing much
additional output current.
Table 1. Recommended Inductors
MAX
L I DC DCR HEIGHT
PART (μH) (mA) ( Ω ) (mm) MANUFACTURER
LQH2MCN4R7M02L 4.7 300 0.84 0.95 Murata
LQH2MCN6R8M02L 6.8 255 1.0 www.murata.com
LQH2MCN100M02L 10 225 1.2
SDQ12 4.7 1.45 0.40 1.2 Cooper Electronics
Coupled 10 980 0.72 Tech
Inductor 15 780 1.15 www.cooperet.com
LPD3015 4.7 860 0.52 1.4 Coilcraft
Coupled 10 580 1.0 www.coilcraft.com
Inductor
to 4.7μF. The following formula is useful to estimate the
output capacitor value needed:
C OUT =
where I SW = 0.25A (LT3483) or I SW = 0.5A (LT3483A) and
? V OUT = 30mV. The flying capacitor in the inverting charge
pump configuration ranges from 0.1μF to 0.47μF. Multiply
the value predicted by the above equation for C OUT by 1/10
to determine the value needed for the flying capacitor.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER URL
AVX www.avxcorp.com
Capacitor Selection
Kemet
Murata
www.kemet.com
www.murata.com
V OUT
10 μ A
ThesmallsizeandlowESRofceramiccapacitorsmake
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 4.7μF ceramic bypass capacitor on the V IN pin is rec-
ommended where the distance to the power supply or
battery could be more than a couple inches. Otherwise,
a 1μF 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
voltage ripple. For low output voltage ripple in the inverting
flyback configuration, use a 4.7μF to 10μF capacitor. The
inverting charge pump utilizes values ranging from 0.22μF
Taiyo Yuden www.tyuden.com
Setting the Output Voltage
The output voltage is programmed using one feedback
resistor according to the following formula:
R1 = –
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.
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.
3483fc
7
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| LT3483EDC | 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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| 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 |
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